Phytophagous mites (Acari: Eriophyoidea) recorded from Svalbard, including the description of a new species
Eriophyoid mites (Eriophyoidea) are minute phytophagous mites with great economic importance and great invasive potential. In spite of their demonstrated impact on ecosystem functions, knowledge of eriophyoid mite fauna in the Arctic is lacking. To date, only eight eriophyoid mite species have been recorded from the entire region north of the Arctic Circle. The Svalbard archipelago is one of the most biologically investigated Arctic areas. Despite the fact that studies on invertebrates on Svalbard have been conducted for more than one hundred years, eriophyoids have never been recorded before from this place, except for one likely accidental record of a single specimen belonging to the genus Eriophyes. Thus, each new study of eriophyoid mite fauna in this region is important. In this paper, a new species of eriophyoid mite, Cecidophyes siedleckii n. sp., is described and illustrated. Nucleotide sequence data (D2 region of 28S rDNA) were employed to complement traditional morphological taxonomy. The first record of Aceria saxifragae (Rostrup 1900) from Svalbard is also provided, with supplementary morphological descriptions and illustrations. Eriophyoid mites represent an important and underutilized taxon that is available to ecologists studying the effects of changing climatic conditions on Svalbard.
KeywordsArctic biology Eriophyidae Extreme environments Molecular taxonomy Herbivorous mites DNA barcoding
In polar regions, invertebrates occupy virtually all ecological niches, from the deep ocean floor to the surfaces of glaciers, including extreme environments, such as nunataks, tundra, and polar deserts, and they often constitute significant components of these harsh ecosystems (e.g., Dastych 1985; Janiec 1996; Dastych and Drummond 1996; Porazińska et al. 2004; Coulson et al. 2014b; Górska et al. 2014; Zawierucha et al. 2015). The past two decades have seen a rapid increase in research interest toward invertebrates in the Svalbard archipelago (e.g., Lippert et al. 2001; Coulson et al. 2003, 2014a; Johnsen et al. 2014; Pilskog et al. 2014; Zawierucha et al. 2015). Currently, the terrestrial invertebrate fauna of Svalbard consists of over 1000 species (Coulson et al. 2014b), and invertebrates are still being discovered in this region as both new records and new species to science (e.g., Kaczmarek et al. 2012; Zawierucha 2013; Zawierucha et al. 2013; Dabert et al. 2014; Coulson et al. 2014a, b; Coulson et al. 2015). However, while the invertebrate fauna of Svalbard is among the best known for any Arctic region (Hodkinson 2013), only about 115 mite (Acari) species have been recorded so far from the Svalbard archipelago, with the majority of them being soil-inhabiting Mesostigmata and Oribatida (Coulson et al. 2014b). Mites occupy almost every habitat on Earth and are an important component of every environment. Many mite species have evolved in associations with other organisms (i.e., plant or animal hosts) that function as their permanent or temporary habitats (Walter and Proctor 2013). Studies of parasitic or phytophagous organisms can provide insights into ecosystem functions. On Svalbard, for example, a thorough understanding of the biotic constraints to the proliferation and spread of plant species, particularly non-native species, is important when considering their ability to compete for available habitat with other plant species.
Previous studies on the parasitic invertebrates in the Svalbard archipelago have focused mostly on Nematoda, Cestoda, Acanthocephala, and Insecta (e.g., Hackman and Nyholm 1968; Halvorsen and Bye 1999; Kuklin et al. 2004; Stien et al. 2010), while a few studies have focused on parasitic Acari associated with birds (Gwiazdowicz et al. 2012; Dabert et al. 2014) and polyphagous Bryobia species (Coulson and Refseth 2004). Among phytophagous mites, only two species, both Tetranychidae (viz., Bryobia borealis Oudemans, 1930, and Bryobia praetiosa Koch, 1836), have been recorded from Svalbard (Summerhayes and Elton 1928; Thor 1930, 1934; MacFadyen 1954; Coulson and Refseth 2004), notwithstanding the well-described flora of the Svalbard archipelago, which includes 173 recorded vascular plant species, as well as 373 moss and 597 lichen species (Jónsdóttir 2005). Only one plant-feeding mite in the family Eriophyidae has ever been recorded from Svalbard, a possibly accidental record of a single specimen belonging to the genus Eriophyes (Thor 1934). In that case, neither the mite species nor its host plant were identified.
The eriophyoid mites are among the most economically important groups of phytophagous Acari (Lindquist and Amrine 1996). They cause direct damage to their host plants and often transmit plant viruses (Duso et al. 2010). Moreover, they have great invasive potential (Navia et al. 2010) due to their ability to spread undetected via wind-borne or human-mediated dispersal (Michalska et al. 2010). Given that the Arctic tundra is influenced by climate change (e.g., Walkera et al. 2006; Coulson 2013), greater knowledge of new phytophagous organisms and potential vectors of plant disease in this region is urgently needed.
Eriophyoid mite identification is often hampered by their minute size and structural simplicity (Lindquist and Amrine 1996), as well as the occurrence of cryptic lineages (Skoracka et al. 2012, 2013, 2014; Miller et al. 2013). In this paper, we describe a new species of eriophyoid plant-feeding mite, Cecidophyes siedleckii n. sp., using DNA data (D2 region of 28S rDNA) to complement traditional morphological taxonomy. In addition, we provide the first record of Aceria saxifragae (Rostrup, 1900) from Svalbard with supplementary morphological data to augment the original description.
Materials and methods
Morphological nomenclature follows Lindquist (1996), data measurements follow de Lillo et al. (2010), and systematic classification follows Rostrup (1900), Liro (1940) and Amrine et al. (2003). Measurements refer to the lengths of a given structure in micrometers unless otherwise stated. In the description of the new species, the holotype female measurement precedes the corresponding range for paratypes (given in parentheses). Micrographs were made using an Olympus BX41 microscope and Olympus Camedia C-5050 camera.
Several of the collected eriophyoid mite specimens were rinsed in 98 % alcohol and stored in 180 µl of ATL buffer for several days. A nondestructive method of DNA extraction was applied, as described by Dabert et al. (2008), using the DNeasy Blood & Tissue Kit (Qiagen, Hilden, Germany). Post-extraction, specimen cuticles were transferred to 70 % ethanol and mounted on slides for identification. A fragment of the D2 region of 28S ribosomal DNA (28S rDNA) was amplified using the primers D1D2fw2 (Sonnenberg et al. 2007) and 28SR0990 (Mironov et al. 2012). PCR was conducted in a 10 µl reaction volume containing 5 µl of Type-it Multiplex PCR Master Mix (Qiagen, Hilden, Germany), 50 pM of each primer, and 4 µl of DNA template.
The thermal cycling profile consisted of an initial denaturation step of 5 min at 95 °C, followed by 35 cycles of 30-s denaturation at 95 °C, 30-s annealing at 50 °C, and 1-min extension at 72 °C, with a final step of 15 min at 72 °C. The reaction products were diluted by half, and 5 μl of each diluted PCR product was stained with the GelRed Nucleic Acid Gel Stain (Biotium, Hayward, CA, USA) and checked by electrophoresis on a 1 % agarose gel. The samples were sequenced with the following primers to obtain the D2 region of the 28S rDNA: universal forward primer D1D2fw2, specific forward primer Er28SF05, and specific reverse primer Er28SR05 (Szydło et al. 2015). Sequencing was performed using BigDye Terminator version 3.1 on an ABI Prism 3130XL Genetic Analyzer (Applied Biosystems, Foster City, CA, USA). The forward and reverse sequences were aligned and assembled with BioEdit version 7 software (Hall 1999). Trace files were aligned and edited with MEGA6 (Tamura et al. 2013). Four obtained sequences of 627 bp were deposited in NCBI (National Center for Biotechnology Information) GenBank database under Accession Numbers KR072631, KR072632, KR072633, and KR072634.
The taxonomic identification of specimen cuticles showed that DNA sequences were obtained from only one of the two collected species, belonging to the genus Cecidophyes Nalepa, 1887. Identification of the study subject to the genus Cecidophyes was confirmed by the Basic Local Alignment Search Tool (Standard Nucleotide BLAST; NCBI), optimized for blastn (somewhat similar sequences) and megablast (highly similar sequences). Two sequences of Cecidophyes spp. from the NCBI GenBank database (Accession Numbers: KF782480 and KF782481) were aligned with the Cecidophyes n. sp. sequences to calculate the Kimura-2-parameter (K2P) distances between sequences with MEGA6 software.
Female (holotype and seven paratypes): body spindleform, 195 (163–203); width 67 (63–70). Gnathosoma 20 (25–30), projecting forward and down, dorsal pedipalpal genual setae d 5 (4–7), setae ep 4 (3–4), chelicerae 25 (22–25). Prodorsal shield 38 (41–42), 50 (48–49) wide, subrectangular, anterior lobe 12 (11–13) long, 21 (20–22) wide. Shield pattern with complete median line and admedian lines; submedian lines incomplete and appear as six short lines. Lack of scapular setae sc. Legs with all usual segments and setae present. Leg I 32 (27–34); femur 10 (8–11), seta bv 14 (10–15); genu 5 (4–5), seta l” 32 (30–34); tibia 8 (8–9), seta l’ 8 (7–10); tarsus 7 (6–8), setae: ft” 20 (18–25), ft’ 18 (14–22), u’ 4 (3–5); solenidion ω 6 (5–7); empodium simple 5 (4–6) with 5 (4–5) rays. Leg II 29 (27–31); femur 11 (9–11), seta bv 12 (10–13); genu 5 (4–5), seta l” 6 (6–8); tibia 7 (6–7); tarsus 7 (6–7), setae: ft” 21 (20–26), ft’ 5 (5–8), u’ 4 (3–4); solenidion ω 6 (6–8); empodium simple 4 (4–6) with 5 (4–5) rays. Coxae smooth. Setae 1b 4 (4–5), tubercles 1b 11 (8–11) apart; setae 1a 17 (12–18), tubercles 1a 14 (13–14) apart; setae 2a 36 (32–35), tubercles 2a 27 (23–28) apart; distance between tubercles 1b and 1a 5 (5–6), distance between tubercles 1aand 2a 9 (7–10). Genital opening 15 (15–17), 28 (26–28) wide, genital coverflap with 24 (22–30) longitudinal ridges in two rows; setae 3a 10 (7–11), tubercles 3a 19 (18–19) apart. Opisthosoma spindleform; 50 (48–52) dorsal annuli, 53 (52–57) ventral annuli with minute, oval microtubercles situated near rear margin of the annuli. Opisthosomal setae: c2 34 (25–29), tubercles 58 (58–67) apart, on 8th (6–8) ventral annulus; d 50 (45–51), tubercles 43 (43–44) apart, on 17th (16–18) ventral annulus; e 7 (7–9), tubercles 25 (25–26) apart, on 29th (27–31) ventral annulus; f 22 (21–26), tubercles 25 (25–26) apart, on 48th (46–51) ventral annulus, 5th (5–7) annulus from rear. Setae h1 absent; setae h2 48 (48–68), 10 (10) apart.
Family Eriophyidae Nalepa, 1898
Subfamily Cecidophyinae Keifer, 1966
Tribe Cecidophyini Keifer, 1966
Genus Cecidophyes Nalepa, 1887
C. siedleckii n. sp. Kiedrowicz, Szydło & Skoracka
Holotype female [SVERCEC01], paratypes females—seven females [SVERCEC02, SVERCEC03, SVERCEC04, SVERCEC05, SVERCEC06, SVERCEC07, SVERCEC08] from northern coast of Hornsund, Wedel Jarlsberg Land, 77°00′N, 15°19.8′, August 2011 from S. oppositifolia (Saxifragaceae), leg. K. Zawierucha. Material is deposited in the collection of the Faculty of Biology, Adam Mickiewicz University—AMU, Poznań, Poland, and in the collection of Department of Applied Entomology, Faculty of Horticulture, Biotechnology and Landscape Architecture, Warsaw University of Life Sciences—SGGW, Warsaw, Poland.
Relation to the host:
Free-living on upper part of leaves. Mites were not found inside flowers or buds. No plant deformations were noted.
The specific name is the noun in genitive case derived from the surname of the founder of the Polish Polar Station on Svalbard, where these specimens were collected.
A 627-bp fragment of the D2 region of 28S rDNA was amplified and sequenced from four female specimens of C. siedleckii n. sp. (GenBank Acc. KR072631, KR072632, KR072633, KR072634). This DNA marker has been utilized successfully in phylogenetic studies at the species level and has been proposed as a DNA bar code for taxonomic differentiation of animal species (Sonnenberg et al. 2007). This DNA fragment has also been successfully applied to the delimitation of species (including cryptic species) in eriophyoid mites (e.g., Skoracka et al. 2013, 2014; Lewandowski et al. 2014). No variability between obtained sequences was detected. Interspecific K2P divergence between new species and two other Cecidophyes spp., namely Cecidophyes hirsutes Xue, Song and Hong, 2011 and Cecidophyes truncatis Xue, Song and Hong, 2011, was 12.3 and 18.1 %, respectively, which corresponded to divergences between congeneric eriophyoid species reported in other studies (e.g., Lewandowski et al. 2014).
Cecidophyes siedleckii is the first Cecidophes species found on plants belonging to the family Saxifragaceae. Cecidophyes glaber (Nalepa, 1892) has been described from Sedum reflexum L., Crassulaceae, which together with Saxifragaceae belongs to the same order, Saxifragales. The new species is similar to C. glaber in having complete median and admedian lines on the prodorsal shield; however, these lines are composed of short dashes in C. glaber, whereas they are continuous in C. siedleckii. Additionally, these two species can be differentiated by the shapes of the submedian lines and dorsal microtubercles. Cecidophyes glaber has regular and complete submedian lines and large dorsal microtubercles. Cecidophyes siedleckii has irregular and interrupted submedian lines and minute dorsal tubercles. The new species can be also differentiated from Cecidophes galii (Karpelles, 1884) described from Galium aparine L. (Rubiaceae) by the shapes of submedian lines (which are complete and regular in C. galii and irregular and interrupted in C. siedleckii) and the number of opisthosomal annuli (near 70 in C. galii and fewer than 60 in C. siedleckii). The prodorsal shield design, composed of longitudinal lines, and the knotless tarsal solenidion in the new species differentiate it from Cecidophyes truncatis (Xue, Hong and Song, 2001) and Cecidophyes hirsutes (Xue, Hong and Song, 2001), which both have network shield designs and knobbed tarsal solenidions. Cecidophyes hirsutes also differs from the new species by having elliptical microtubercles (compared to minute microtubercles in C. siedleckii). Many North American Cecidophyes species have network shield designs, which differentiate them from the new species (Baker et al. 1996). One example is Cecidophyes tampae Keifer, 1966, which differs from the new species in having elongate dorsal microtubercles, a genital coverflap with 16 ridges, coxae with curved lines, and a 6-rayed empodium. By contrast, C. siedleckii has minute microtubercles, a genital coverflap with 22–30 ridges, smooth coxae, and a 4- to 5-rayed empodium.
Female (six specimens): body vermiform 186–268; 63–80 wide. Gnathosoma 29–32, projecting forward and down, dorsal pedipalpal genual setae d 5–7, setae ep 4, chelicerae 22–26. Prodorsal shield 32–40, 42–45 wide, subrectangular, without anterior lobe. Shield pattern: incomplete median line, which appears as a long line in the front 3/4 with a transverse line in the rear 1/3 and two short arcs at the rear shield margin; admedian lines complete; submedian lines form a mosaic pattern. Scapular setae sc 19–24, tubercles sc 25–30 apart. Legs with all usual segments and setae present. Leg I 30–35; femur 9–10, seta bv 7–8; genu 5–6, seta l” 25–30; tibia 7–8, seta l’ 7–8; tarsus 8, setae: ft” 22–26, ft’ 12–17, u’ 3-6; solenidion ω 8–9; empodium simple 6–7 with 5 rays. Leg II 26–31; femur 8–10, seta bv 8–12; genu 4–6, seta l” 10–11; tibia 4–6; tarsus 6–7, setae: ft” 21–27, ft’ 6–9, u’ 5–6; solenidion ω 8–9; empodium simple 6–8 with five rays. Coxae with spots. Setae 1b 6–8, tubercles 1b 14–15 apart; setae 1a 20–22, tubercles 1a 11–12 apart; setae 2a 20–35, tubercles 2a 27 apart; distance between tubercles 1b and 1a 7–9, distance between tubercles 1a and 2a 8. External genitalia 17–18, 22–24 wide, genital coverflap with 9–11 longitudinal ridges; setae 3a 15–16, tubercles 3a 18–20 apart. Opisthosoma vermiform; 62–63 dorsal annuli, 61–65 ventral annuli. Microtubercles near rear margin of the annuli; rounded. Opisthosomal setae: c2 25–33, tubercles 55–69 apart, on 8–9 ventral annulus; d 35–41, tubercles 46–54 apart, on 20–24 ventral annulus; e 12–13, tubercles 23–28 apart, on 33–37 ventral annulus; f 20–25, tubercles 22–27 apart, on 54–59 ventral annulus, 5–6 annulus from rear. Setae h1 4–5, 7–8 apart; setae h2 40–58, 10–11 apart; distance between h1 and h2 2–3.
Family Eriophyidae Nalepa, 1898
Subfamily Eriophyinae Nalepa, 1898
Tribe Aceriini Amrine and Stasny, 1994
Genus Aceria Keifer, 1944
A. saxifragae (Rostrup, 1900)
Six females from northern coast of Hornsund, Wedel Jarlsberg Land, 77°00′N, 15°19.8′, August 2011 from S. oppositifolia (Saxifragaceae), leg. K. Zawierucha. Material is deposited in the collection of the Faculty of Biology, Adam Mickiewicz University, Poznań, Poland.
Relation to the host:
Free-living on leaves. According to previous observations (Rostrup 1900; Liro 1940; James Amrine personal communication), A. saxifragae has been found both free-living and inhabiting buds. In the course of our study, we did not found any mite specimens inside buds. All recorded specimens observed in dried samples were associated with plant leaves.
Female A. saxifragae specimens collected in South Spitsbergen National Park in this study differed morphologically both from the specimens presented in the original description (Rostrup 1900) and a subsequent description by Liro (1940) due to their shorter sc setae [as can be observed in the line drawings provided by Liro (1940)] and 5-rayed empodium (it is four-rayed in the earlier descriptions). Moreover, the prodorsal shield pattern (not described, but only presented in figures by previous authors) is more striking and complicated compared to earlier descriptions. The prodorsal shield pattern of specimens in this study is composed of an incomplete median line, which appears as a long line in the front 3/4 with a transverse line in the rear 1/3 and two short arcs at the rear shield margin; admedian lines are complete, and the submedian lines form a mosaic pattern. The prodorsal shield pattern presented by Liro (1940) lacks the transverse line and mosaic pattern. Despite considerable effort made to find type material of A. saxifragae (James W. Amrine, West Virginia University and Nikolaj Scharff, Natural History Museum of Denmark, personal communication), we were not able to confirm neither the type collection still exists nor where it was deposited. Therefore, we were only able to compare our complementary description to the descriptions by Rostrup (1900) and Liro (1940). Unfortunately, such situations are common for type materials of many eriophyoid species (James W. Amrine personal communication). Nevertheless, the differences observed between the original descriptions and material examined by us may be the result of (1) human perception bias, (2) limitations in the state of the art, and/or (3) phenotypic variation among populations of A. saxifragae. A century ago, microscopy was not as precise or discriminating as today, thus the descriptions of eriophyoid species of that time lacked detail and accuracy, the result being sub-optimal measurements and drawings. Thus, it is possible that some lines on the prodorsal shield of A. saxifragae may have been missed in the initial descriptions. Quantitative morphological traits can also vary in eriophyoid mites, and this variation may exist between populations separated geographically or by host association (e.g., Navia et al. 2009; Shen et al. 2014). Thus, the observed differences in the length of sc setae and the number of empodial rays may reflect intraspecies variation.
There is undoubtedly a general lack of knowledge of eriophyoid mite distributions in Arctic regions. A small number of eriophyoid mite species have been reported from Greenland, Iceland, and Arctic Russia, e.g., A. saxifragae (Rostrup, 1900); A. reykjaviki Szydło, Skaftason and Skoracka, 2010; A. thomasi (Nalepa, 1889); Aculops pedicularis (Nalepa, 1892); A. thymi (Nalepa, 1889); Aculus groenlandicus (Rostrup, 1900); A. tetanothrix (Nalepa, 1889); Phyllocoptes empetri Rostrup, 1900 (Amrine 2003; Szydło et al. 2010), as well as one possibly accidental specimen from Svalbard belonging to the genus Eriophyes (Thor 1934). The study described here represents an important contribution to taxonomic research on Eriophyoidea on Svalbard, and reports one new species of eriophyoid mite with bar-code data and one new record of A. saxifragae with a supplementary morphological description.
Aceria saxifragae was originally described from S. oppositifolia in Greenland (Rostrup 1900). It has subsequently been recorded on the same host plant in Finland, Sweden, and mainland of Norway (Amrine 2003), although these faunistic records imply neither a definitive place of origin of this mite species nor any conclusions about the possible changing distribution of A. saxifragae. Saxifraga oppositifolia is not listed as a native of Svalbard (Jónsdóttir 2005). However, it is listed as native to nearby Greenland, as well as Canada, Alaska, and the northern continental USA (USDA-NRCS 2015). Given that most eriophyoid species are host specialists (Skoracka et al. 2010), it is likely that both eriophyoid species found on S. oppositifolia in this study, A. saxifragae and C. siedleckii n. sp., arrived to Svalbard with their host plant. To better understand where these mite species originated and how they are distributed, more comprehensive studies comparing mite populations and their host plants from different localities (e.g., Greenland, Canada, Alaska, mainland Scandinavia), as well as surveys of mites on close relatives of S. oppositifolia that are present on Svalbard, would be useful, preferably including DNA marker data that can discriminate between intraspecific populations. Moreover, to explain possible routes of mite dispersal and how they arrived on Svalbard, it would be useful in particular to collect populations found near transport hubs to/from Svalbard, such as in mainland Norway.
Overall, there has been a lack of comprehensive sampling effort for phytophagous mites in the Arctic. Of those locations that have been surveyed, many were only sampled on one occasion, often by non-specialists (Coulson et al. 2014a), resulting in sub-optimal sampling methods that yield incomplete data. The paucity of knowledge regarding eriophyoid mites inhabiting the Arctic likely results in part from methodological difficulties. Eriophyoid mites are minute organisms, and their detection and identification require specialized training.
Effects of changing climates will vary from region to region (Hodkinson 2013). Climate warming in the Arctic is expected to modify regional plant communities. For example, warmer and longer growing seasons are leading to an overall increase in the abundance of deciduous woody shrub species such as dwarf birch (Betula nana L. 1753) and willows (Salix spp. L.) (Sturm et al. 2001; Tape et al. 2006; Forbes et al. 2010). The number of invasive species is also increasing globally, in part as a result of intensified and accelerated human trade and travel (e.g., Kobelt and Nentwig 2008; Coulson 2013). This is especially true for plants in Svalbard (Alsos et al. 2007). The frequency and abundance of phytophagous arthropods associated with these plants, both native and introduced, are also likely to increase as a result of these changes. Eriophyoid mites can be very damaging to their host plants (Lindquist and Amrine 1996). Although most eriophyoids are highly host-specific, numerous eriophyoid species are generalist pests of a variety of crop species (e.g., Aceria tulipae, Aceria tosichella, Abacarus hystrix; Skoracka et al. 2010). This, combined with the known ability of many eriophyoids to vector plant diseases (Oldfield and Proeseler 1996), underlines the urgent need to fill gaps in knowledge of phytophagous mite ecology and taxonomy in high Arctic habitats. This is particularly true of the Svalbard archipelago, whose location near the confluence of ocean currents and air masses of varied thermal characteristics (Humlum et al. 2007) makes it one of the most climatically sensitive regions in the world (Rogers et al. 2005).
The study was financially supported by Faculty of Biology, Adam Mickiewicz University (AMU), Poznań, Poland, and partially by the Polish Ministry of Science and Higher Education via the “Diamond Grant” programme (Grant No. DIA 2011035241 to K.Z.). The authors are grateful to Prof. James Jr. Amrine for helpful information regarding eriophyoid mites occurring in Arctic, Dr. Nikolaj Scharff for information about type material of Aceria saxifragae, Dr. Ziemowit Olszanowski (AMU) for the assistance regarding taxonomical nomenclature, and Prof. Karol Latowski (AMU) for the confirmation of the botanical taxonomic identification.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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