Abstract
Studies of wild boar, Sus scrofa Linnaeus 1758, in urban and suburban areas of Budapest, Hungary, have indicated that these populations do not have continuous contact. Based on the assumption that the city has a discrete population, we hypothesized that the urban wild boar would differ genetically from those in suburban areas. Analysis of single-nucleotide polymorphism (SNP) data using the GeneSeek Genomic Profiler (GGP) Porcine 50 K system (Neogen, Scotland, UK) differentiated three populations: Buda (B) from the Western bank of the Danube; Buda Surrounding (BS); and Valkó (V) from the Eastern bank of the Danube. The coefficient of genetic differentiation (FST) for the B and BS populations was low. The inbreeding coefficients of the populations BS and V were close to zero, while population B had a high positive value reflecting the influence of founders and the inbreeding of the continuous urban population. The genome regions that were most differentiated between the B and BS populations were analyzed based on the FST values of the SNP markers using a mixed linear multi-locus model and BayeScan software. The most differentiated marker, WU_10.2_18_56278226, was found on chromosome 18. The surrounding region contained several candidate genes that could play important roles in adaptations related to human-induced stress. Two of these, encoding the adenylate cyclase 1 (ADCY1) and inhibin beta A chain precursor (INHBA) genes, were sequenced. While IHBA gene did not display variation, the allele distribution of the ADCY1 gene in the B population was significantly different from that of the BS population supporting the parapatric differentiation of wild boar.
Similar content being viewed by others
Avoid common mistakes on your manuscript.
Introduction
The phenomenon of urban sprawl has led to adaptable and tolerant generalist animal species being observed within cities (Møller 2009), including some large mammals (Adams et al. 2006; Adams 2016; Heltai and Szőcs 2008), like coyote (Wurth et al. 2020), deer (Westerfield et al. 2019), bear (Fusaro et al. 2017), or bobcat (Young et al. 2019). This can cause different types of animal–vehicle collisions (Creacy 2006; Kilpatrick and LaBonte 2007; Weckel and Rockwell 2013), damage to human property (Creacy 2006; Kilpatrick and LaBonte 2007; Sacchi et al. 2002), and the spread of various diseases (Belant 1997; Jacquin et al. 2010; Weckel and Rockwell 2013).
Wild boar (Sus scrofa) have frequently been reported to cause conflicts in European cities. These large, prolific mammals (Bieber and Ruf 2005) can cause property damage (Campbell and Long 2009; Saito et al. 2011; Schley et al. 2008) and provoke fear among human populations (Kotulski and König 2008). Populations are found on most continents and have adapted to a wide variety of habitats (Baubet et al. 2004; Cahill et al. 2012; Cuevas et al. 2010; Gabor et al. 1999; McGaw and Mitcell 1998; Siemann et al. 2009; Thomson and Challies 1988; Yasin 2011). Conflict has resulted from the spatiotemporal activity of S. scrofa populations overlapping with that of humans (Cahill et al. 2012). The problems have ranged from general inconvenience to serious issues such as animal–vehicle collisions (Cahill et al. 2012; Licoppe et al. 2013; Thurfjell et al. 2015). Wild boar can be a threat to birds (Oja et al. 2017), destroy plants in gardens and parks (Schley et al. 2008; Licoppe et al. 2013; Hamrick et al. 2011), injure domestic and farm animals (West et al. 2009; Schley and Roper 2003), and damage property (Licoppe et al. 2013). Kotulski and König (2008) reported that the main issues with wild boar in Berlin occurred in parks and gardens, although they also caused human injuries (Stillfried et al. 2017; Castillo-Contreras et al. 2018). A related problem is the emergence of zoonotic diseases, which can be a threat to humans, and to domesticated and farm animals (Hygnstrom et al. 2011; Riley et al. 1998; Schley et al. 2008). The published literature has linked wild boar to Escherichia coli infection (Cahill et al. 2012; Licoppe et al. 2013), leptospirosis (Cahill et al. 2012; McGaw and Mitcell 1998; Meng et al. 2009), brucellosis (Hamrick et al. 2011; McGaw and Mitcell 1998; Meng et al. 2009; West et al. 2009), salmonellosis (Hamrick et al. 2011), rabies (Hamrick et al. 2011; McGaw and Mitcell 1998), classical swine fever (Hamrick et al. 2011; Meng et al. 2009), trichinosis (Hamrick et al. 2011; McGaw and Mitcell 1998; Meng et al. 2009; West et al. 2009), toxoplasmosis (Cahill et al. 2012; Meng et al. 2009), African swine fever (McGaw and Mitcell 1998; Meng et al. 2009), pseudorabies (Meng et al. 2009; West et al. 2009), Japanese encephalitis (McGaw and Mitcell 1998; Meng et al. 2009), and tuberculosis (McGaw and Mitcell 1998; Meng et al. 2009). These diseases can be a serious health risk not only to other animals but also to humans. These findings indicate that interventions should be considered for managing the wild boar populations, the damage caused by boars, and reducing the human wild boar conflicts in urban areas.
The appropriate intervention will depend on whether the target species is transient or has been settled in the area. In the former case, an effective way to reduce conflict may be to intervene in suburban areas; in the latter case, conflict management should be resolved in part or in whole within the city. Our previous studies have revealed that urban wild boar in Budapest stayed in the city. 89.95% of data points of sows, tracked with a global positioning system transmitter, were within Buda territory during the 265-day study period (Csókás et al. 2020; Sütő et al. 2020). This was supported by the findings of our study of the urban feeding habits of wild boar, which showed that, although they mainly sought natural food sources within populated areas, their primary food sources in this environment differed from those in their natural habitats (Heltai et al. 2016; Katona et al. 2018a, b). In the 12th district of Budapest, Buda, where our study was carried out, the proportion of oak trees was high; therefore, the most advantageous basic food source for wild boar was acorns (Katona et al. 2018b). Based on the assumption that there was no continuous contact between the central and peripheral populations, we hypothesized that there was a breeding population within the city that was genetically different from the suburban population.
Molecular genetic analyses of wild boar have previously been useful in the investigation of their population genetic structure (Hampton et al. 2004), the relatedness of populations under anthropogenic effects (Nikolov et al. 2009), and their genomic diversity related to local pig breeds (Muñoz et al. 2019; Bâlteanu et al. 2019). We therefore chose to test our hypothesis via DNA analyses based on SNP-chip genotype data and sequencing of candidate genes around the top hit provided by genome-wide association analysis.
Materials and methods
Samples
In total, 81 wild boar muscle samples were collected from the Buda (B) region (N = 28), the Buda Surrounding (BS) area (N = 26), and the Valkó (V) area (N = 27) during hunting events organized by the game-management units (Fig. 1). The V population served as an outgroup in our analyses. Based on the estimates of Pilis Park Forestry Company more than 10% of the populations have been sampled. Samples included all, hunter-picked animals. The ratio of adult:young animals were 2.11, 2.25, and 2.37 in B, BS, and V area, respectively. Approval from the animal research ethics committee was not necessary as the hunting events were organized independently from the research presented here. These hunting events were part of the routine wildlife-management activity based on the hunting law (Law No. LV. of 1996 on the Protection, Management and Hunting of Wildlife) and were inspected by the local government authority. We collected tissue samples from the carcasses after the hunting events. Samples were stored at − 20 °C. The B area is the western, hilly part of Budapest located west of the Danube and has a considerable amount of woodland (Fig. 1). The BS area refers to the forested region beyond the Buda boundary. The V area is located east of the Danube, around 40 km from Budapest. Evidence of the existence of the downtown population of S. scrofa prior to the first scientific report by Bogdán and Heltai (2014) was collected via Google using the keywords ‘wild boar’ and ‘Budapest’ (Online Resource 1).
DNA isolation
Total DNA was isolated from the samples as follows. Each muscle sample was ground with 200 µl grinding buffer comprising 0.5 M sorbitol, 0.2 M Tris–HCl, 7 mM ethylenediaminetetraacetic acid (EDTA), 20 mM NaHSO3, and 4% polyvinylpyrrolidone (PVP40). The suspension was incubated for 1 h at 60 °C in 200 µl lysis buffer comprising 0.4 M Tris–HCl, 60 mM EDTA, 2 M NaCl, 2% cetrimonium bromide (CTAB), 10% sodium dodecyl sulfate (SDS), and 0.6 µg/µL proteinase K. After centrifugation (4600 RPM, 10 min, 4 °C), 250 µl potassium acetate (3 M) was added to the supernatant. Then, 10 min of incubation on ice was followed by centrifugation (4600 RPM, 15 min, 4 °C). The supernatant was filtered through glass fiber at 4600 RPM for 5 min at 4 °C. After adding 280 µl isopropanol to the filtrate, the mixture was incubated for 20 min at − 20 °C. After incubation and subsequent centrifugation at 4600 RPM for 25 min at 4 °C, 200 µl of ice-cold ethanol (70%) was added to the pellet. The mix was then centrifuged (4600 RPM, 5 min, 4 °C), and the pellet was dried and then dissolved in 200 µl of 1xTE solution.
Quality control
Data evaluation followed the methods described in our previous surveys (Bâlteanu et al. 2019; Zsolnai et al. 2020). DNA typing was performed using a GGP 50 K Porcine SNP chip (Neogen, Scotland, UK). Quality control procedures were conducted on the raw data using SNP and Variation Suite (SVS) software v.8.8.1 (Golden Helix, Bozeman, MT, USA). SNPs with a call rate < 95% or with a minor allele frequency (MAF) < 0.05 were eliminated from the dataset. Duplicated samples and/or closely related animals identified by an identical by state (IBS) value > 0.95 and individuals with a genotype call rate < 95% were also removed. After filtering steps, the final dataset included 77 animals (NB = 25, NBS = 25, and NV = 27) and 47,765 SNPs.
Diversity statistics and genome-wide screening
The genetic distance (FST) and the of inbreeding coefficients (FIS) were calculated to describe the studied populations. The genetic distance of the markers (FST_markers) was calculated to look at the differences at genomic level. Determination of the previously mentioned F values was performed using SVS. The inbreeding coefficient was estimated as: (observed—expected number of homozygous markers)/(number of genotyped markers—expected number of homozygous markers). The expected number of homozygous markers was calculated as \({\sum }_{j=1}^{L} ({1-2p}_{j}{q}_{j}\frac{{T}_{j}}{({T}_{j}-1)}\)), where L was the number of genotyped markers, p and q were the frequencies of the alleles, and T was twice the number of non-missing genotypes for marker j. FST was estimated according to Weir and Cockerham (1984).
To display the relative positions of the sampled animals relative to each other, we used the PLINK software v1.9 (–mds-plot 2 and –cluster options) to build a multidimensional scaling plot using a genome-wide IBS pairwise distance matrix (Purcell et al. 2007). The IBS pairwise similarity between any two individuals was calculated as ((number of markers sharing two alleles + 0.5 * number of markers sharing one allele)/number of markers). Identities of frequency distributions of the pairwise IBS values of the studied populations were tested by Kruskal–Wallis probe (Kruskal and Wallis 1952).
Tests of the proportion of mixed ancestry and population structure were performed via the ADMIXTURE software v.1.3 using the –cv option (cross-validation procedure was performed fivefold) for determining the most probable cluster number (K) from the value of cross-validation error in each Ks (Alexander and Lange, 2011). The cross-validation procedure was performed five times, and the algorithm was terminated when the log-likelihood increased by less than 10−4 between iterations. Before analysis, the alleles of the SNP loci were recoded to numerical values 1 and 2 by PLINK using the –recode12 switch as required by ADMIXTURE. The file format was also changed to the binary type by the –make-bed option to facilitate faster computation by ADMIXTURE.
To gain insight into the possible differences of the internal structure of runs of homozygosity (ROH) of the populations, calculations were carried out with the PLINK v.1.9 software using the –homozyg command (Purcell et al. 2007). The minimum length of an ROH was set at 1 Mb to minimize the detection of spurious ROH. To make sure that ROH length was not affected by low SNP density, the minimum number of SNPs that constituted an ROH was set to 50 considering the following calculation method (Lencz et al. 2007):
where ns was the number of SNPs per individual, ni was the number of individuals, α was the percentage of false-positive ROH (set to 0.05), and het was the mean SNP heterozygosity across all SNPs. The density of SNPs was set to one SNP for each 100 kb and a maximum distance of 1000 kb was allowed between two consecutive SNPs. The scanning window contained 50 SNPs, and the maximum number of missing SNPs per window was set to five with an allowance for one heterozygous SNP. The ROH was classified based on physical length into four size categories: 1 to ≤ 5 Mb; 5 to ≤ 15 Mb; 15 to ≤ 30 Mb; and > 30 Mb (Bâlteanu et al. 2019; Zsolnai et al. 2020). For each ROH category, the mean of the ROH per breed was calculated by summing the lengths of all ROH in a given individual for each one of the categories under consideration and divided by the number of animals. The inbreeding coefficient derived from the ROH genomic coverage (FROH) was calculated by dividing the total ROH length per individual by total genome length (2444 Mb) for each individual.
To look for differentiated loci in the comparison of B and BS, the following approaches were tested: (1) the genetic distance of the markers (FST_markers) was calculated by the SVS program, (2) BayeScan software (Foll and Gaggiotti 2008) was used to determine the departure of each SNP loci from neutrality, where the total number of iterations was 100,000, and (3) genotypic association tests were performed using a multi-locus mixed-model (MLMM) algorithm implemented in SVS. A genomic kinship matrix was used in MLMM for the correction of population structure (Bâlteanu et al. 2019; Segura et al. 2012). The applied model was: y = Xβ + Zu + e, where y denoted the population (B and BS were recoded to one and zero) of the sampled animals, X was the matrix of fixed effects composed of SNPs, Z was the matrix of random animal effects, e was the residual effects, and β and u were vectors represent the coefficients of fixed and random effects, respectively. Nearby genes of the identified SNPs were identified via S. scrofa Assembly Build 10.2 database.
Sequencing
Target regions, identified by genome-wide screening as described above, adenylate cyclase 1 (ADCY1), and inhibin beta A chain precursor (INHBA) encoding genes were selected for sequencing. The polymerase chain reaction (PCR) thermal cycle of the reactions was 95 °C for 1 min followed by 30 cycles consisting of 95 °C for 15 s, T °C for 15 s, and 72 °C for 35 s, where T was 65, 62, and 59 in cases spanning exon 2 and exons 6–7–8 of the ADCY1 gene and exon 1 of the INHBA gene, respectively. PCRBIO HiFi Polymerase (PCR Biosystems, London, UK) was used in the reactions according to the manufacturer’s instructions (PCR Biosystems, Wayne, PA, USA).
The PCR products (Table 1) of candidate genes were pair-end sequenced on the Illumina MySeq instrument (Enviroinvest, Pécs, Hungary). The PCR fragments of 17 animals (NB = 5, NBS = 7, and NV = 5,) were sequenced.
The raw sequence data were processed by bwa 0.7.17-r1188 (Li and Durbin 2009); variant calling was performed by samtools 1.9 and bcftools 1.9 using htslib 1.9 (Li 2011) following the instructions in the respective manuals. Briefly: raw sequences were aligned by bwa to the bwa-indexed reference sequence. Sorting and pileup were accomplished by samtools. View, stats, and call options of bcftools were used to create variant files carrying the detected sequence variations. After allele calls, the distributions of alleles among the populations were compared via the Chi-square test (IBM SPSS 25 Statistics Premium Campus Edition, US).
Results
Population analysis
To supplement the first scientific literature (Bogdán and Heltai 2014) on the existence of the downtown population data were gained via Google search (Online Resource 1). The first reports on the appearance of wild boar were made in 1993, when 0.2% of the human population used the Internet. The first report on human–wild boar conflict dated back to 2001 (at which time there was 27.7% Internet penetration). Since 2004, the reports were distributed throughout the year. The first video report was created in 2010 (at which time there was 65% Internet penetration).
The inbreeding coefficients of the populations BS and V were close to zero (FIS = 0.020 and 0.017, respectively), while population B had a high positive value (FIS = 0.120) (Table 2). The 95% confidence intervals (CIs) of the FST values did not overlap. The coefficients of genetic differentiation (FST) for the pair B and BS were 0.015. For the populations BS and V, the FST was 0.049, while the distance of population B from V was 0.087. The 95% CIs of the FST values did not overlap (Table 3).
The characterization of the length and distribution of the ROH (Fig. 2) showed that the estimates for the B group differed from those in the BS and V populations. The means of the ROH (Fig. 3) in the first (0–5 Mb) and the third (15–30 Mb) classes were similar regarding the BS and V groups. In all ROH categories (0–5, 5–15, 15–30, and > 30 Mb), the wild boar in population B had the highest values. The lowest level of homozygosity was observed in the BS and V populations. The inbreeding coefficient derived from the ROH genomic coverage value was highest in the B population (FROH_B = 0.165), while the values were lower in the BS and V populations (FROH_BS = 0.082 and FROH_V = 0.079).
To investigate the genetic relationship between the sampled populations, we built a multidimensional scaling plot calculated with PLINK (Fig. 4). Eigenvalues of first and second components were above one. Third, fourth, and fifth components have eigenvalues 0.753, 0.653, and 0.610, respectively. The first component (eigenvalue = 2.151, explained 39.06% of total variance) separated population V from B and BS. Partial overlapping was observed between the B and BS groups. The second component (eigenvalue = 1.341, explained 24.34% of total variance) divided both the B and BS groups. In the ADMIXTURE analysis of B + BS population (Fig. 5A), the most probable cluster number was two (at the lowest cross-validation error, K = 2). When B + BS + V populations were examined the difference disappeared between B and BS, the most probable K value was also two (Fig. 5B).
The pairwise IBS values of individuals within each population were visualized (Fig. 6) to check their distribution. The identity of the frequency distribution of pairwise IBS values of the three populations was tested by the non-parametric test (Kruskal and Wallis 1952). The p values of the pairs were pBS-B = 0.000, pBS-V = 0.000, and pB-V = 0.123.
Frequency of pairwise similarity values (IBS) of B, BS, and V populations, respectively. Horizontal axis represents pairwise similarity values of the individuals within Buda, Buda surroundings, and Valkó populations. IBS values are arranged into categories. Vertical axis is the number of occurrences within a given category
Genome-wide screening and sequencing
The genetic distances of the markers (FST_markers) were calculated between populations B and BS where the maximum FST_markers value (0.405) was harbored by the SNP marker WU_10.2_18_56278226 on chromosome 18, in agreement with the result of the mixed linear multi-locus model (–log10p value = 20.7, false discovery rate = 7.9e−17). Selection signs (pBayeScan = 0.78–0.86) were detected by the BayeScan program on chromosomes 5 and 13, and a strong diversifying selection sign (pBayeScan = 0.96, alpha = 1.58) was detected on chromosome 18, on the same marker as mentioned above.
The ADCY1 and INHBA genes were selected for further investigation around WU_10.2_18_56278226. Successful amplifications were achieved spanning exons 2 and 6–7–8 of ADCY1 and on the first exon of INHBA (Table 1). Variation among the samples was not detected on the first exon of INHBA, while ADCY1 displayed several differences (Table 4). Chi-square analysis was performed on the allele distributions of the ADCY1 gene between the studied populations (Table 5). In relation of the population pairs B-V, B-BS, and B-V, the detected differences at position 17,850 and at positions ranging from 51,087 to 51,993 were significant at p < 0.05 level.
Discussion
The suburban populations, BS and V, were found to have been indigenous and continuous within their investigated territory with significant population increases (Csányi et al. 2019). The first publication about the downtown population, B, dated back to 2014 (Bogdán and Heltai 2014) and was followed by further studies (Heltai et al. 2016; Deutsch and Heltai 2017; Csókás et al. 2020). Internet posts about wild boar appearances in the downtown area, B, prior to 2012 suggested that the population has been established since 1993; however, Tari et al. (2016) reported their first observation to have been in 2000. While the Internet penetration was relatively constant, at < 4%, for many years, there was a noticeable increase in the number of reports, which jumped to 178, in 2004 and 2005. Subsequently, the observations increased nearly co-linearly with the Internet penetration value. In 2005, the S. scrofa population appeared to reach a saturated state in terms of numbers (Online Resource 1), which might explain the abovementioned trends. Over such a long period of time, the genome of the downtown population could have undergone changes that were driven by the founder effect, stochastic changes, or human-induced selection. Samplings of the studied populations were random, animals are considered as representative ones for their groups.
Looking at the genome of the animals sampled, the inbreeding coefficient was high (FIS = 0.120), indicating that individuals within group B were more closely related than would be expected. The inbreeding coefficient differed from those of the suburban populations BS and V (Table 2). The suburban population BS, which lived in close vicinity to the downtown group, and V, which lived on the other side of the Danube and was separated from B and BS by another barrier, the capital, did not differ in their inbreeding coefficients, indicating that their populations had similar genetic statuses.
The coefficient of genetic differentiation, FST, differed for each studied pair (Table 3). B and BS displayed the lowest value (FST = 0.015). Genetic differentiation was also low for the suburban populations BS and V (FST = 0.049). The highest value, reflecting moderate genetic differentiation, was found between the B and V populations (FST = 0.087). The level of genetic differentiation decreased in the B–V, BS–V, and B–BS pairings, respectively, as was expected.
The relative positions of animals based on their SNP loci were plotted (Fig. 4). The control or outgroup (V) was separated from populations B and BS. The partial overlapping of B and BS might reflect occasional territory swapping of the animals between regions B and BS with possible mating events in the other population. Both the B and BS groups were separated into two sets and it was assumed that these had different founders with different genetic backgrounds.
The lengths of the ROHs (Fig. 2) in the studied animals revealed long segments (400–800 Mb) that were seen almost exclusively in population B, in accordance with its higher inbreeding value FIS (Table 2). The animals in populations BS and V had similar ROH lengths; indeed, according to the comparative analysis of the animals from the three regions (Fig. 3) in which the ROH categories and their 95% CIs were determined, the BS and V populations did not differ in the low category (0–5 Mb) and the third category (15–30 Mb). The downtown population, B, displayed the highest mean values in each ROH category. The difference in B versus BS or V and the similarity of BS and V were also confirmed by their genomic coverage values of runs of homozygosity (FROH). The FROH_B value of population B was twice as high (0.165) as that of BS or V, which also indicated an inbred downtown population.
The results of the ADMIXTURE analysis of B and BS (Fig. 5A) provided at K = 2 revealed seven animals from population BS (similar to the MDS analysis in Fig. 4) that were sampled in the territory of the downtown population. We assumed that they were explorers from the suburban population, BS, as the same behavior has been observed for other species in which there are both transient and resident city populations at the same time (Iossa et al. 2010). Opposite pattern also occurs with individuals assigned to the B genetic cluster sampled in the territory of BS subpopulation. Distinction of B and BS populations disappears in higher context, when V population was included into the examined set (Fig. 5B), indicating that the separation of the populations B and BS is in the beginning phase. Nevertheless, it is questionable if separation will be stronger as time goes by or remains as reported here, since we can notice individuals in B and BS populations (Figs. 4, Fig. 5A) which are not clustered into their original sampling populations. This phenomenon indicates that members of urban and suburban populations occasionally swap territories.
The pairwise IBS frequency distribution values (Fig. 6) differed significantly regarding population pairs B–BS and BS–V (pBS-B = 0.000; pBS-V = 0.000). The frequency distribution of B and V populations did not contrast according to the test (pB-V = 0.123); however, visual inspection revealed that B had a bimodal frequency distribution, which differed from population V. The observed bimodal distribution of the downtown population suggested that a part of the group was more inbred. Bimodal distribution is expected when individuals with different genetic backgrounds exist in the same population. As reported, individuals from Buda spent 89.95% of their time in the urban environment (Bogdán and Heltai 2014) owing to the enhanced availability of their natural food, maize, offered at baiting sites and the managed lawns (Katona et al. 2018a, b). The wild boar of Buda live in close proximity to humans, which is expected to alter their behavior. Such behavioral changes can be learned (Changizi et al. 2002) or can be acquired via altered gene function (Jorgensen et al. 2019).
To locate the region of the genome in which the downtown animals differed most greatly from that the suburban wild boar, several methods were utilized between the B and BS populations. Three different algorithms exposed the most differentiated marker to be on chromosome 18. The locus WU_10.2_18_56278226 became the center of our search for candidate genes. The selection of candidate genes around this locus was based on the working hypothesis that downtown animals differed in personality from suburban individuals and this would be manifested in genes involved in brain functioning.
The nearby genes of WU_10.2_18_56278226 were identified on the S. scrofa genome assembly 10.2. Some of the genes around this marker have proven or postulated roles in the brain and neural processes, such as phosphoglycerate mutase 2 (PGAM2), drebrin like (DBNL), ADCY1, calcium/calmodulin-dependent protein kinase II beta (CAMK2B), and INHBA. PGAM2 can be found in different tissues and forms: the slow-migrating muscle (MM) isozyme and fast-migrating brain (BB) isozyme (Jorgensen et al. 2019) are related to meat and production traits in domestic pigs (Fontanesi et al. 2008). DBNL plays a part in neuron morphogenesis (Inoue et al. 2019). ADCY1 is primarily expressed in the brain (https://www.proteinatlas.org/ENSG00000164742-ADCY1/tissue), plays a part in the memory process (Wang et al. 2004) and brain development (Sethna et al. 2017), and is associated with deafness in humans (Santos-Cortez et al. 2014). ADCY1 may affect the feeding efficiency of pigs via the cyclic adenosine monophosphate (cAMP) signaling pathway (Xu et al. 2018); its expression was found to be altered in a comparison of thyroid glands of Jinhua and Yorkshire pig breeds (Shen et al. 2016). CAMK2B is associated with mental retardation and autosomal dominant non-syndromic intellectual disability (Küry et al. 2017). INHBA is associated with follicle and testis size, and plays a role in eye, tooth, and testis development (https://www.ncbi.nlm.nih.gov/gene?cmd=Retrieve&dopt=full_report&list_uids=3624), and axon regeneration (Omura et al. 2015). ADCY1, which was one of our candidate genes selected for sequencing, displayed variations among the studied populations (Table 4).
Based on Chi-square analysis of alleles of the ADCY1 gene, the downtown population B displayed a significant difference from the other populations BS and V (Table 5). Among the single-nucleotide variations in the ADCY1 region, four of the mutations were in exons, two of which were missense mutations G/A and T/C causing amino acid changes Alanine/Threonine and Tryptophan/Arginine on exon 6 and 7, respectively. Alanine is a strong helix former, while Threonine is a strong β-sheet former (Chou and Fasman 1974). Alanine/Threonine substitutions usually are on the surface of the 3D structures facilitating interactions, aggregations of proteins known in human (Podoly et al. 2010). Arginine and Tryptophan highly differ, e.g., in their hydrophobicity. The latter also plays important role in glycan-protein interactions (Yamaguchi et al. 1999). Mutations described above could alter structure of ACDY1 protein which could affect phenotypic traits or developmental processes (Xu et al. 2018; Sethna et al. 2017).
Conclusions
SNP-chip analysis revealed genetic differences between downtown and suburban wild boar populations. Since the urban environment requires altered behavior from the animals, we hypothesized that the downtown B population might carry well-differentiated markers in its genome. Such signs were revealed by different algorithms. The genomic site identified was found on chromosome 18. This region carries several genes connected with neural processes which was in line with our working hypothesis that downtown animals differ in personality from suburban individuals and such differences should be manifested in genes affecting the brain. Out of the candidate genes, INHBA and ADCY1, the latter displayed variations.
Sequence analysis revealed alterations in the investigated groups. PCR products, spanning exons 2, 6, 7, and 8 of the ADCY1 gene, carried mutations. Analysis of the allele distribution of the studied populations showed a significant difference in population B compared to populations BS and V. Further investigation of the structure and expression of the ADCY1 gene might yield further insights (Reed et al. 2020) into the manifestation of stress tolerance in wild boar living in the urban environment and could also confirm the parapatric differentiation of wild boar, S. scrofa Linnaeus 1758, as a consequence of partial isolation (Gavrilets et al. 2000).
Availability of data and materials
Data were deposited with the Hungarian University of Agriculture and Life Sciences Institute for Wildlife Management and the Nature Conservation Department of Wildlife Biology and Management.
Code availability
All analyses were performed using the softwares described in the “Materials and methods” section.
References
Adams CE (2016) Urban wildlife management. CRC Press of Taylor & Francis Group, Abingdon
Adams CE, Lindsey KJ, Ash SJ (2006) Urban wildlife management. CRC Press of Taylor & Francis Group, Abingdon
Alexander DH, Lange K (2011) Enhancements to the ADMIXTURE algorithm for individual ancestry estimation. BMC Bioinform 12:246. https://doi.org/10.1186/1471-2105-12-246
Bâlteanu VA, Cardoso TF, Amills M, Egerszegi I, Anton I, Beja-Pereira A, Zsolnai A (2019) The footprint of recent and strong demographic decline in the genomes of Mangalitza pigs. Animal 13:2440–2446. https://doi.org/10.1017/S1751731119000582
Baubet E, Bonenfant C, Brandt S (2004) Diet of the wild boar in the French Alps. Galemys 16:101–113
Belant JL (1997) Gulls in urban environments: landscape—level management to reduce conflict. Landsc Urban Plan 38:245–258. https://doi.org/10.1016/S0169-2046(97)00037-6
Bieber C, Ruf T (2005) Population dynamics in wild boar Sus scrofa: ecology, elasticity of growth rate and implications for the management of pulsed resource consumers. J Appl Ecol 42:1203–1213. https://doi.org/10.1111/j.1365-2664.2005.01094.x
Bogdán O, Heltai M (2014) A vaddisznó előfordulásának vizsgálata Budapesten (investigation of the occurrence of wild boar in Budapest). Vadbiológia 16:87–96
Cahill S, Llimona F, Cabaneros L, Calomardo F (2012) Characteristics of wild boar (Sus scrofa) habituation to urban areas in the Collserola Natural Park (Barcelona) and comparison with other locations. Anim Biodiv Conserv 35:221–233
Campbell TA, Long DB (2009) Feral swine damage and damage management in forested ecosystems. For Ecol Manag 257:2319–2326. https://doi.org/10.1016/j.foreco.2009.03.036
Castillo-Contreras R, Carvalhob J, Serrano E, Mentaberre G, Fernández-Aguilar X, Coloma A, González-Crespo C, Lavín S, López-Olvera JR (2018) Urban wild boars prefer fragmented areas with food resources near natural corridors. Sci Total Environ 615:282–288. https://doi.org/10.1016/j.scitotenv.2017.09.277
Changizi MA, McGehee RM, Hall WG (2002) Evidence that appetitive responses for dehydration and food-deprivation are learned. Physiol Behav 75:295–304. https://doi.org/10.1016/s0031-9384(01)00660-6
Chou PY, Fasman GD (1974) Conformational parameters for amino acids in helical, beta-sheet, and random coil regions calculated from proteins. Biochemistry 13:211–222
Creacy G (2006) Deer management within suburban areas. Texas Parks and Wildlife. https://tpwd.texas.gov/publications/pwdpubs/media/pwd_bk_w7000_1197.pdf. Accessed on 7 Januar 2020
Csányi S, Márton M, Köteles P, Lakatos EA, Schally G (2019) Vadgazdálkodási Adattár—1960–2018/2019. (Hungarian Game Management Database 1960–2018/2019). Hungarian Game Management Database, Gödöllő, pp 24
Csókás A, Schally G, Szabó L, Csányi S, Kovács F, Heltai M (2020) Space use of wild boar (Sus scrofa) in Budapest: are they resident or transient city dwellers? Biologica Futura 71:39–51. https://doi.org/10.1007/s42977-020-00010-y
Cuevas MF, Novillo A, Campos C, Dacar MA, Ojeda RA (2010) Food habits and impact of rooting behaviour of the invasive wild boar, Sus scrofa, in a protected area of the Monte Desert, Argentina. J Arid Environ 74:1582–1585. https://doi.org/10.1016/j.jaridenv.2010.05.002
Deutsch F, Heltai M (2017) A vaddisznó jelenlétének vizsgálata közvetett jelek alapján egyes budai kerületekben (The indication of wild boars’ presence on the basis of indirect signs in the Buda districts). Vadbiológia 17:1–12
Foll M, Gaggiotti O (2008) A genome-scan method to identify selected loci appropriate for both dominant and codominant markers: a bayesian perspective. Genetics 180:977–993. https://doi.org/10.1534/genetics.108.092221
Fontanesi L, Davoli R, Costa NL, Beretti F, Scottia E, Tazzoli M, Tassone F, Colombo M, Buttazzoni L, Russo V (2008) Investigation of candidate genes for glycolytic potential of porcine skeletal muscle: association with meat quality and production traits in Italian Large White pigs. Meat Sci 80:780–787. https://doi.org/10.1016/j.meatsci.2008.03.022
Fusaro JL, Conner MM, Conover MR, Taylor TJ, JrMW K, Sherman JR, Ernest HB (2017) Comparing urban and wildland bear densities with a DNA-based capture-mark-recapture approach. Human-Wildl Interact 11:50–63. https://doi.org/10.26077/kjag-fe40
Gabor TM, Hellgren EC, Van den Bussche RA, Silvy NJ (1999) Demography, sociospatial behaviour and genetics of feral pigs (Sus scrofa) in a semi-arid environment. J Zool 247:311–322. https://doi.org/10.1111/j.1469-7998.1999.tb00994.x
Gavrilets S, Li H, Vose MD (2000) Patterns of parapatric speciation. Evolution 54:1126–1134
Hampton JO, Spencer PBS, Alpers DL, Twigg LE, Woolnough AP, Doust J, Higgs T, Pluske J (2004) Molecular techniques, wildlife management and the importance of genetic population structure and dispersal: a case study with feral pigs. J Appl Ecol 41:735–743. https://doi.org/10.1111/j.0021-8901.2004.00936.x
Hamrick B, Smith M, Jaworowski C, Strickland B (2011) A landowner’s guide for wild oig management: practical methods for wild pig control. Mississippi State University Extension Service and Alabama Cooperative Extension System. https://extension.msstate.edu/sites/default/files/publications/publications/p2659_0.pdf. Accessed on 19 June 2020
Heltai M, Szőcs E (2008) Városi vadgazdálkodás. Jegyzet vadgazda mérnöki szakos hallgatók részére (Urban game management. Note for wildlife engineering students). Szent István University, Gödöllő
Heltai M, Kovács F, Rácz K, Csépányi P, Nagy A (2016) A vaddisznó táplálkozásának vizsgálata lakott környezetben, Budapesten (Investigation of the feeding of wild boar in a populated environment in Budapest). Vadbiológia 18:27–34
Hygnstrom SE, Garabrandt GW, Vercauteren KC (2011) Fifteen years of urban deer management: the Fontenelle Forest experience. Wildl Soc B 35:126–136. https://doi.org/10.1002/wsb.56
Inoue S, Hayashi K, Fujita K, Tagawa K, Okazawa H, Kuboet K, Nakajima K (2019) Drebrin-like (Dbnl) controls neuronal migration via regulating N-cadherin expression in the developing cerebral cortex. J Neurosci 39:678–691. https://doi.org/10.1523/JNEUROSCI.1634-18.2018
Iossa G, Soulsbury CD, Baker PJ, Harris S (2010) A taxonomic analysis of urban carnivore ecology. In: Gehrt SD, Riley SPD, Cypher BL (eds) Urban carnivores. Ecology, conflict, and conservation. John Hopkins University Press, Baltimore, pp 173–184
Jacquin L, Cazelles B, Prévot-Julliard AC, Leboucher G, Gasparini J (2010) Reproduction management affects breedingecology and reproduction costs in feral urban Pigeons (Columba livia). Can J Zool 88:781–787. https://doi.org/10.1139/Z10-044
Jorgensen C, Taylor J, Barton T (2019) The impact of ethologically relevant stressors on adult mammalian neurogenesis. Brain Sci 9:E158. https://doi.org/10.3390/brainsci9070158
Katona K, Lakatos EA, Márton M, Szabó L, Csókás A, Csányi S, Heltai M (2018a) A vaddisznó budapesti jelenlétének lehetséges táplálkozási okai (Possible nutritional reasons for the presence of wild boar in Budapest). In: Czikkelyné ÁN, Sándor K, Seress G (eds) Urbanizációs Ökológia Konferencia. Pannon Egyetem, Veszprém, p 44
Katona K, Lakatos EA, Márton M, Szabó L, Csókás A, Csányi S, Heltai M (2018b) Feeding habits of urban wild boar in Budapest, Hungary. In: Modern aspects of sustainable management of game populations: 6th international wildlife and game management symposium: book of abstracts, Sofia, Bulgaria, p 17
Kilpatrick HJ, LaBonte AM (2007) Managing Urban Deer in Connecticut: a guide for residents and communities. Connecticut Department of Environmental Protection Bureau of Natural Resources, Hartford
Kotulski Y, König A (2008) Conflicts, crises and challenges: wild boar int he Berlin city—a social empirical and statistical survey. Natura Croatica 17:233–246
Kruskal WH, Wallis WA (1952) Use of ranks in one-criterion variance analysis. J Am Stat Assoc 47:583–621. https://doi.org/10.2307/2280779 (errata, ibid. 48, 907–911)
Küry S, van Woerden GM, Besnard T, Onori MP, Latypova X, Towne MC, Cho MT, Prescott TE, Ploeg MA, Sanders S et al (2017) De novo mutations in protein kinase genes CAMK2A and CAMK2B cause intellectual disability. Am J Hum Genet 101:768–788. https://doi.org/10.1016/j.ajhg.2017.10.003
Lencz T, Lambert C, DeRosse P, Burdick KE, Morgan TV, Kane JM, Kucherlapati R, Malhotra AK (2007) Runs of homozygosity reveal highly penetrant recessive loci in schizophrenia. Proc Natl Acad Sci USA 104:19942–19947. https://doi.org/10.1073/pnas.0710021104
Li H (2011) A statistical framework for SNP calling, mutation discovery, association mapping and population genetical parameter estimation from sequencing data. Bioinformatics 27:2987–2993. https://doi.org/10.1093/bioinformatics/btr509
Li H, Durbin R (2009) Fast and accurate short read alignment with Burrows–Wheeler transform. Bioinformatics 25:1754–1760. https://doi.org/10.1093/bioinformatics/btp324
Licoppe A, Prévot C, Heymans M, Bovy C, Caesar J, Cahill S (2013) Managing wild boar in human-dominated landscape. In: 31st International Union of Game Biologist Congress, Brussels, Belgium. http://www.wildlife-man.be/docs/urban-wild-boar-international-survey.pdf. Accessed on 19 June 2020
McGaw CC, Mitcell J (1998) Feral pigs (Sus scrofa) in Queensland. In: Pest status review series—land protection. The Department of Natural Resources and Mines: Queensland, Australia. https://www.daf.qld.gov.au/__data/assets/pdf_file/0010/57277/IPA-FeralPig-PSA.pdf. Accessed on 19 June 2020
Meng XJ, Lindsay DS, Sriranganathan N (2009) Wild boar as sources for infectious diseases in livestock and humans. Philos Trans R Soc Lond B Biol Sci 364:2687–2707. https://doi.org/10.1098/rstb.2009.0086
Møller AP (2009) Successful city dwellers: a comparative study of the ecological characteristics of urban birds in the Western Palearctic. Oecologia 159:849–858. https://doi.org/10.1007/s00442-008-1259-8
Muñoz M, Bozzi R, García-Casco J, Núñez Y, Ribani A, Franci O, García F, Škrlep M et al (2019) Genomic diversity, linkage disequilibrium and selection signatures in European local pig breeds assessed with a high density SNP chip. Sci Rep 9:13546. https://doi.org/10.1038/s41598-019-49830-6
Nikolov IS, Gum B, Markov G, Kuehn R (2009) Population genetic structure of wild boar Sus scrofa in Bulgaria as revealed by microsatellite analysis. Acta Theriol 54:193–205. https://doi.org/10.4098/j.at.0001-7051.049.2008
Oja R, Soe E, Valdmann H, Saarma U (2017) Non-invasive genetics outperforms morphological methods in faecal dietary analysis, revealing wild boar as a considerable conservation concern for ground-nesting birds. PLoS ONE 12:e0179463. https://doi.org/10.1371/journal.pone.0179463
Omura T, Omura K, Tedeschi A, Riva P, Painter MW, Rojas L et al (2015) Robust axonal regeneration occurs in the injured CAST/Ei mouse central nervous system. Neuron 86:1215–1227. https://doi.org/10.1016/j.neuron.2015.05.005
Podoly E, Hanina G, Soreq H (2010) Alanine-to-threonine substitutions and amyloid diseases: butyrylcholinesterase as a case study. Chem Biol Interact 187:64–71. https://doi.org/10.1016/j.cbi.2010.01.003
Purcell S, Neale B, Todd-Brown K, Thomas L, Ferreira MAR, Bender D, Maller J, Sklar P, de Bakker PIW, Daly MJ, Sham PC (2007) PLINK: a toolset for whole-genome association and population-based linkage analyses. Am J Hum Genet 81:559–575. https://doi.org/10.1086/519795
Reed EMX, Serr ME, Maurer AS, Burford Reiskind MO (2020) Gridlock and beltways: the genetic context of urban invasions. Oecologia 192:615–628. https://doi.org/10.1007/s00442-020-04614-y
Riley SPD, Hadidian J, Manski DA (1998) Population density, survival, and rabies in raccoons in an urban national park. Can J Zool 76:1153–1164. https://doi.org/10.1139/z98-042
Sacchi R, Gentilli A, Razzetti E, Barbieri F (2002) Effects of building features on density and flock distribution of feral pigeons Columba livia var. domestica in an urban environment. Can J Zool 80:48–54. https://doi.org/10.1139/z01-202
Saito M, Momose H, Mihira T (2011) Both environmental factors and countermeasures affect wild boar damage to rice paddies in Boso Peninsula, Japan. Crop Prot 30:1048–1054. https://doi.org/10.1016/j.cropro.2011.02.017
Santos-Cortez RL, Lee K, Giese AP, Ansar M, Amin-Ud-Din M, Rehn K, Wang X, Aziz A, Chiu I, Ali RH, Smith JD, Shendure J, Bamshad M, Nickerson DA, Ahmed ZM, Ahmad W, Riazuddin S, Leal SM (2014) Adenylate cyclase 1 (ADCY1) mutations cause recessive hearing impairment in humans and defects in hair cell function and hearing in zebrafish. Hum Mol Genet 23:3289–3298. https://doi.org/10.1093/hmg/ddu042
Schley L, Roper T (2003) Diet of wild boar Sus scrofa in Western Europe, with particular reference to consumption of agricultural crops. Mamm Rev 33:43–56. https://doi.org/10.1046/j.1365-2907.2003.00010.x
Schley L, Dufrêne M, Krier A, Frantz AC (2008) Patterns of crop damage by wild boar (Sus scrofa) in Luxembourg over a 10-year period. Eur J Wildl Res 54:589–599. https://doi.org/10.1007/s10344-008-0183-x
Segura V, Vilhjálmsson BJ, Platt A, Korte A, Seren Ü, Long Q, Nordborg M (2012) An efficient multi-locus mixed-model approach for genome-wide association studies in structured populations. Na Genet 44:825–830. https://doi.org/10.1038/ng.2314
Sethna F, Feng W, Ding Q, Robison AJ, Feng Y, Wang H (2017) Enhanced expression of ADCY1 underlies aberrant neuronal signalling and behaviour in a syndromic autism model. Nat Commun 8:14359. https://doi.org/10.1038/ncomms14359
Shen Y, Mao H, Huang M, Chen L, Chen J, Cai Z, Wang Y, Xu N (2016) Long noncoding RNA and mRNA expression profiles in the thyroid gland of two phenotypically extreme pig breeds using ribo-zero RNA sequencing. Genes 7:34. https://doi.org/10.3390/genes7070034
Siemann E, Carrillo JA, Gabler CA, Zipp R, Rogers WE (2009) Experimental test of the impacts of feral hogs on forest dynamics and processes in the southeastern US. For Ecol Manag 258:546–553. https://doi.org/10.1016/j.foreco.2009.03.056
Stillfried M, Gras P, Busch M, Börner K, Kramer-Schadt S, Ortmann S (2017) Wild inside: urban wild boar select natural, not anthropogenic food resources. PLoS ONE. https://doi.org/10.1371/journal.pone.0175127
Sütő D, Heltai M, Katona K (2020) Quality and use of habitat patches by wild boar (Sus scrofa) along an urban gradient. Biologia Futura 71:69–80. https://doi.org/10.1007/s42977-020-00012-w
Tari T, Sándor Gy, Heffentráger G, Náhlik A (2016) Wild boar habituation to urban areas in Hungary, in the light of web presence. In: 5th international hunting and game management symposium, Book of Abstracts, Debrecen, Hungary, p 26
Thomson C, Challies CN (1988) Diet of feral pigs in the Podocarp-Tawa forests of the Urewera ranges. New Zeal J Ecol 11:73–78
Thurfjell H, Spong G, Olsson M, Ericsson G (2015) Avoidance of high traffic levels result in lower risk of wild boar—vehicle accidents. Landsc Urban Plan 133:98–104. https://doi.org/10.1016/j.landurbplan.2014.09.015
Wang H, Ferguson GD, Pineda VV, Cundiff PE, Storm DR (2004) Overexpression of type-1 adenylyl cyclase in mouse forebrain enhances recognition memory and LTP. Nat Neurosci 7:635–642. https://doi.org/10.1038/nn1248
Weckel M, Rockwell RF (2013) Can controlled bow hunts reduce overabundant white-tailed deer populations in suburban ecosystem? Ecol Model 250:143–154. https://doi.org/10.1016/j.ecolmodel.2012.10.018
Weir BS, Cockerham CC (1984) Estimating F-statistics for the analysis of population structure. Evolution 1984(38):1358–1370. https://doi.org/10.2307/2408641
West BC, Cooper AL, Armstrong JB (2009) Managing wild pigs: a technical guide. Hum Wildl Interact Monogr 1:1–55
Westerfield GD, Shannon JM, Duvuvuei OV, Decker TA, Snow NP, Shank ED, Wakeling BF, White HB (2019) Methods for managing human-deer conflicts in urban, suburban, and exurban areas. Hum Wildl Interact Monogr 3:1–99
Wurth AM, Ellington EH, Gehrt SD (2020) Golf courses as potential habitat for urban coyotes. Wildl Soc Bull 44:1–9. https://doi.org/10.1002/wsb.1081
Xu Y, Qi X, Hu M, Lin R, Hou Y, Wang Z, Zhou H, Zhao Y, Luan Y, Zhao S, Li X (2018) Transcriptome analysis of adipose tissue indicates that the cAMP signaling pathway affects the feed efficiency of pigs. Genes 9:336. https://doi.org/10.3390/genes9070336
Yamaguchi H, Nishiyama T, Uchida M (1999) Binding affinity of N-glycans for aromatic amino acid residues: implication for novel interaction between N-glycans and proteins. J Biochem 126:261–265
Yasin U (2011) Effects of wild boar (Sus scrofa) on farming activities: a case study of Turkey. Afr J Biotechnol 10:8823–8828. https://doi.org/10.5897/AJB10.2698
Young JK, Golla J, Draper JP, Broman D, Blankenship T, Heilbrun R (2019) Space use and movement of urban bobcats. Animals 9:275. https://doi.org/10.3390/ani9050275
Zsolnai A, Maróti-Agóts Á, Kovács A, Bâlteanu AV, Kaltenecker E, Anton I (2020) Genetic position of Hungarian Grey among European cattle and identification of breed-specific markers. Animal 14:1786–1792. https://doi.org/10.1017/S1751731120000634
Acknowledgements
We are grateful to the Ministry of Agriculture and the Pilis Park Forestry Company for supporting and help with field data collections. Thanks to Victoria Kitchener for proofreading the initial manuscript. Thanks to our reviewers for providing their valuable notices, comments, and questions.
Funding
Open access funding provided by Hungarian University of Agriculture and Life Sciences. This study was supported by the EFOP-3.6.3-VEKOP-16-2017-00008 project, which was co-financed by the European Union and the European Social Fund.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare no conflicts of interest.
Ethics approval
Approval from the animal research ethics committee was not required, as hunting activities were organized independently as part of routine wildlife management based on Law No. LV. of 1996 on the Protection, Management and Hunting of Wildlife, and were inspected by the local government authority. Tissue samples were collected from the cooled carcasses after the hunting activities.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Handling editor: Laura Iacolina.
Supplementary Information
Below is the link to the electronic supplementary material.
42991_2021_212_MOESM1_ESM.tif
Supplementary file1Online Resource 1 Number of internet reports of wild boar in the Buda region and internet penetration by human inhabitants (expressed as a percentage). The horizontal axis represents the years. The vertical axis is for the number of reports found (blue line with dots) and for the internet penetration (red line with dots). Searching for the appearance of ‘wild boar’ and ‘Budapest’ keywords was accomplished by the Google search engine (TIF 862 KB)
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Zsolnai, A., Csókás, A., Szabó, L. et al. Genetic adaptation to urban living: molecular DNA analyses of wild boar populations in Budapest and surrounding area. Mamm Biol 102, 221–234 (2022). https://doi.org/10.1007/s42991-021-00212-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s42991-021-00212-4