Abstract
The Cross River National Park (CRNP) is an essential ecological gene-pool harbouring one of the oldest tropical rainforests in Africa, and the last remaining rainforest in Nigeria.With the ongoing human-induced habitat degradation, it is critical to assess its amphibian assemblage and understand the role habitat variation plays on local species richness and abundance. Thus, we conducted several surveys between 2017 and 2019 to document its amphibian assemblage and distribution pattern. We also searched primary literature for the list of amphibians previously recorded in CRNP.Using the observation records, we tested the hypothesis that habitat variation affects local species richness and relative abundance. We further assessed the conservation status of species using the IUCN Red List. Results revealed the presence of at least 72 amphibian species in CRNP. Analyses showed that species richness was significantly high in the lowland forests and wetland/swamps when compared to savannah and agricultural field. Our study further revealed increased threats to amphibians of CRNP arising from human activities. The comparatively high species richness and increased threats to amphibians in CRNP highlights the biological importance of CRNP and places it among the most critical site for conservation of amphibians in Nigeria. Finally, we recommend improved community-based conservation programmes for the long-term survival of the amphibians and their associated habitats.
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References
Abbot J, Thomas D, Gardner A, Neba S, Khen M (2001) Understanding the links between conservation and development in Bamenda Highlands, Cameroon. World Dev 29:1115–1136. https://doi.org/10.1016/S0305-750X(01)00033-X
Adetola BO, Adetoro AO (2014) Threats to biodiversity conservation in Cross River National Park, Nigeria. Int J Conserv Sci 5(04):547–552
Agaldo JA, Gwom TG, Aperverga PT (2016) An assessment of present threats and associated conservation implication to the Oban Division forest Cross River National Park; Nigeria’s biodiversity hotspot. Eth J Environ Stud Manag 9(2):938–950. https://doi.org/10.4314/ejesm.v9i2.1S
Akani GC, Luiselli L (2009) Aspects of community ecology of amphibians and reptiles at Bonny Island (Nigeria), an area of priority relevance for petrochemical industry. Afr J Ecol 48(4):939–948. https://doi.org/10.1111/j.1365-2028.2009.01195.x
Akani GC, Politano E, Luiselli L (2004) Amphibians recorded in forest swamp areas of the River Niger Delta (southeastern Nigeria), and the effects of habitat alteration from oil industry development on species richness and diversity. Appl Herpetol 2:1–21. https://doi.org/10.1163/1570754041231604
Akani GC, Aifesehi PE, Petrozzi F, Amadi N, Luiselli L (2014) Preliminary surveys of the terrestrial vertebrate fauna (mammals, reptiles, and amphibians) of the Edumanon Forest Reserve, Nigeria. Trop Zool 27:63–72. https://doi.org/10.1080/03946975.2014.944376
AmphibiaWeb (2020) Amphibians of Nigeria. https://amphibiaweb.org/cgi/amphib_query?rel-isocc=like&orderbyaw=Order&where-isocc=Nigeria. Accessed 17 Apr 2020
Amuzie CC, Akani GC (2017) Amphibian species in Agbada and Rumuesara, Rivers State: their helminth parasites and culture potentials in the Niger Delta. Delta Agric 9(1):21–30
Anderson MJ (2001) A new method for non–parametric multivariate analysis of variance. Austral Ecol 26:32–46. https://doi.org/10.1111/j.1442-9993.2001.01070.pp.x
Araújo MB, Thuiller W, Pearson RG (2006) Climate warming and the decline of amphibians and reptiles in Europe. J Biogeogr 33:1712–1728. https://doi.org/10.1111/j.1365-2699.2006.01482.x
Assemian NE, Kouamé NG, Tohé B, Gourène G, Rödel MO (2015) Spatial distribution patterns of an amphibian community in a threatened West Africa rainforest (Ivory Coast). Int J Sci Res 4(4):316–325
Bakarr M, Bailey B, Byler D, Ham R, Olivieri S, Omland M (2001) From the forest to the sea: biodiversity connections from Guinea to Togo. Conservation Priority– Setting Workshop, December 1999. Conservation International, Washington DC
Bastazini CV, Munduruca JFV, Rocha PL, Napoli MF (2007) Which environmental variables better explain changes in anuran community composition? A case study in the Restinga of Mata de São João, Bahia, Brazil. Herpetologica 63(4):459–471. https://doi.org/10.1655/0018-0831(2007)63[459:WEVBEC]2.0.CO;2
Beebee TJC (1995) Amphibian breeding and climate. Nature 374:219–220. https://doi.org/10.1038/374219a0
Bisong FE (2003) Deforestation motivators by small farmers in common and protected lands in South Eastern Nigeria: A Factor Analytic Approach. Math Connect 3:1–23. https://doi.org/10.4314/mc.v3i1.21502
Cheng TL, Rovito SM, Wake DB, Vredenburg VT (2011) Coincident mass extirpation of neotropical amphibians with the emergence of the infection fungal pathogen Batrachochytrium dendrobatidis. Proc Natl Acad Sci USA 108:9502–9507. https://doi.org/10.1073/pnas.1105538108
Dixo M, Martins M (2008) Are leaf-litter frogs and lizards affected by edge effects due to forest fragmentation in Brazilian Atlantic forest? J Trop Ecol 24:551–554. https://doi.org/10.1017/S0266467408005282
Doherty-Bone TM, Gvoždík V (2017) The amphibians of Mount Oku, Cameroon: an updated species inventory and conservation review. ZooKeys 643:109–139. https://doi.org/10.3897/zookeys.643.9422
Duellman WE (2005) Cusco Amazonico: the lives of amphibians and reptiles in an Amazonian rainforest. Cornell University Press, Ithaca
Dukes JS, Mooney HA (2004) Disruption of ecosystem processes in western North America by invasive species. Rev Chil Hist Nat 77:411–437. https://doi.org/10.4067/S0716-078X2004000300003
Dunn OJ (1964) Multiple comparisons using rank sums. Technometrics 6:241–252
EDGE of Existence (2019) 2019 Amphibian EDGE Lists. https://www.edgeofexistence.org/wp-content/uploads/2019/09/Web-EDGE-Lists-2019_update-April-2019.xlsx. Accessed 12 Feb 2020
Ernst R, Rödel MO (2005) Anthropogenically induced changes of predictability in tropical anuran assemblages. Ecology 86(3):3–8. https://doi.org/10.1890/04-0800
Ernst R, Linsenmair KE, Rödel MO (2006) Diversity erosion beyond the species level: Dramatic loss of functional diversity after selective logging in two tropical amphibian communities. Biol Conserv 33:43–55. https://doi.org/10.1016/j.biocon.2006.05.028
Ezebilo EE (2013) Nature conservation in Cross River National Park, south–east Nigeria: promoting collaboration between local people and conservation authorities. Int J Biodivers Sci Ecosyst Serv Manag 9(3):215–224. https://doi.org/10.1080/21513732.2013.813586
Ezebilo EE, Mattsson L (2010) Socio-economic benefits of protected area as perceived by local people around Cross River National Park, Nigeria. For Pol Econ 12:189–193. https://doi.org/10.1016/j.forpol.2009.09.019
FAO - Food and Agriculture Organization (2011) Global forest resources assessment 2000: Food and Agriculture Organization of the United Nations Rome, Italy
Frost DR (2021) Amphibian species of the world: an online reference. Version 6.1. Electronic Database accessible at https://amphibiansoftheworld.amnh.org/index.php. American Museum of Natural History, New York. Accessed 24 Feb 2021
GBF - Global Forest Watch (2020) World Resources Institute. http://www.globalforestwatch.org. Accessed 19 Apr 2020
Hammer O (2011) PAST– Paleontological statistics. Version 2.12 reference manual. University of Oslo, Natural History Museum, Oslo
Hansen MC, Potapov PV, Moore R, Hancher M, Turubanova SA, Tyukavina A, Thau D, Stehman SV, Goetz SJ, Loveland TR, Kommareddy A, Egorov A, Chini L, Justice CO, Townshend JRG (2013) High-resolution global maps of 21st-century forest cover change. Science 342:850–853. https://doi.org/10.1126/science.1244693
Herrmann H-W, Böhme W, Herrmann PA, Plath M, Schmitz A, Solbach M (2005) African biodiversity hotspots: The amphibians of Mt Nlonako, Cameroon. Salamandra 41:61–81. https://doi.org/10.5962/BHL.PART.80336
Herrmann H-W, Schmitz A, Herrmann PA, Böhme W (2006) Amphibians and reptiles of the Tchabal Mbabo Mountains, Adamaoua Plateau, Cameroon. Bonn Zool Beitr 55(1):27–35
Hillers A, Veith M, Rödel MO (2008) Effects of forest fragmentation and habitat degradation on West African leaf-litter frogs. Conserv Biol 22:762–772. https://doi.org/10.1111/j.1523-1739.2008.00920.x
Hirschfeld M, Blackburn DC, Doherty-Bone TM, Gonwouo LN, Ghose S, Rödel M-O (2016) Dramatic declines of montane frogs in a Central African biodiversity hotspot. PLoS One 11(5):e0155129. https://doi.org/10.1371/journal.pone.0155129
Hocking DJ, Babbitt KJ (2014) Amphibian contributions to ecosystem services. Herpetol Conserv Biol 9(1):1–17
Hsieh HL, Li LA (1998) Rarefaction diversity: A case study of Polychaete communities using an amended FORTRAN program. Zool Stud 37(1):13–21
IUCN (2020) The IUCN red list of threatened species. Version 2020-1. Retrieved from https://www.iucnredlist.org. Accessed 14 Apr 2020
Khaligian A (2012) The guinean forests of West Africa. https://harborside.kusd.edu/projects/wp-content/uploads/2013/09/Areknaz-Khaligian.pdf. Accessed 11 Jan 2020
Kruskal W (1952) Use of ranks in one-criterion variance analysis. J Am Stat Assoc 47(260):583–621. https://doi.org/10.2307/2280779
Lawson D (1993) The reptiles and amphibians of the Korup National Park Project, Cameroon. Herpetol Nat Hist 1(2):27–90
Lea JM, Luiselli L, Politano E (2005) Are there shifts in amphibian faunal composition in Nigerian landscapes undergoing long-term degradation? A case study from a montane environment. Rev Écol (Terre Vie) 60:65–76
Leaché AD, Rödel MO, Linkem CW, Diaz RE, Hillers A, Fujita MK (2006) Biodiversity in a forest island: reptiles and amphibians of the West African Togo Hills. Amphib Reptile Conserv 4(1):22–45
Leaché AD, Grummer JA, Miller M, Krishnan S, Fujita MK, Böhme W, Wagner P (2016) Bayesian inference of species diffusion in the West African Agama agama species group (Reptilia, Agamidae). Syst Biodivers 15:1–12. https://doi.org/10.1080/14772000.2016.1238018
Legendre P, Legendre L (1998) Numerical ecology, 2nd edn. Elsevier Science B.V, Amsterdam
Linder HP, de Klerk HM, Born J, Burgess ND, Fjeldså J, Rahbek C (2012) The partitioning of Africa: statistically defined biogeographical regions in sub-Saharan Africa. J Biogeogr 39(7):1189–1205. https://doi.org/10.1111/j.1365-2699.2012.02728.x
Magurran AE (2004) Measuring biological diversity. Blackwell Publishing, Oxford
Mann HB, Whitney DR (1947) On a test of whether one of two random variables is stochastically larger than the other. Ann Math Stat 18(1):50–60
Margalef R (1958) Information theory in ecology. Gen Syst 3:36–71
Markson AA, Akwaji PI, Umana EJ (2017) Mushroom biodiversity of Cross River National Park (Oban Hills Division), Nigeria. World Sci News 65:59–80
McArdle BH, Anderson MJ (2001) Fitting multivariate models to community data: a comment on distance-based redundancy analysis. Ecology 82:290–297. https://doi.org/10.1890/0012-9658(2001)082[0290:FMMTCD]2.0.CO;2
McCullough J, Alonso LE, Naskrecki P, Wright HE, Osei–Owusu Y (2007) A rapid biological assessment of the Atewa Range Forest Reserve, Eastern Ghana. RAP Bulletin of Biological Assessment 47. Conservation International, Arlington
Mohneke M, Onadeko AB, Rödel MO (2009) Exploitation of frogs – a review with a focus on West Africa. Salamandra 45:93–202
Myers N, Mittermeier RA, Mittermeier CG, da Fonseca GAB, Kent J (2000) Biodiversity hotspots for conservation priorities. Nature 403:853–858. https://doi.org/10.1038/35002501
National Park Service – NPS (2012) National Parks in Nigeria. National Park Service, Abuja
Newmark WD (1991) Tropical forest fragmentation and the local extinction of understory birds in the eastern Usambara Mountains. Tanzania Conserv Biol 5:67–78. https://doi.org/10.1111/j.1523-1739.1991.tb00389.x
Newmark WD, Hough J (2000) Conserving wildlife in Africa: integrated conservation and development projects and beyond. Bioscience 50:585–592. https://doi.org/10.1641/0006-3568(2000)050[0585:CWIAIC]2.0.CO;2
Nneji LM, Adeola AC, Okeyoyin AO, Oladipo OC, Saidu Y, Samuel D, Usongo JY et al (2019a) Diversity and distribution of amphibians and reptiles in Gashaka Gumti National Park, Nigeria. Herpetol Notes 12:543–599
Nneji LM, Adeola AC, Okeyoyin AO, Onadeko AB, Eniang EA, Adeyi AO, Oladipo SO et al (2019b) First record of Foulassi Screeching Frog, Arthroleptis adelphus (Perret, 1966) (Anura, Arthroleptidae, Arthroleptinae), from Nigeria, with notes on its phylogenetic position. Check List 15(2):253–258. https://doi.org/10.15560/15.2.253
Nneji LM, Adeola AC, Okeyoyin AO, Oladipo OC, Saidu Y, Usongo JY, Ugwumba AAA (2019c) Assessing the effectiveness of molecular data for species identification and diversity studies of Nigerian herpetofauna. Mitochondrial DNA Part B Resour 4:589–593. https://doi.org/10.1080/23802359.2018.1561219
Obot EA, Ogar G, Edet CA, Olory CS, Ayuk J, Akongke C (1996) Biological inventory in the Okwangwo Division, CRNP. Progress Report, 1994 – 1996
Olory CS (2018) Contributions of Cross River National Park to National Development: Prospects and challenges. In: Proceedings of 6th NSCB Biodiversity Conference, University of Uyo, Nigeria, pp 309–315
Omofonmwan SI, Osa–Edoh GI (2008) The challenges of environmental problems in Nigeria. J Hum Ecol 23(1):53–57. https://doi.org/10.1080/09709274.2008.11906054
Onadeko AB, Rödel MO (2009) Amphibian surveys in Southwestern Nigeria, West Africa. Salamandra 45:1–14
Onadeko AB, Rödel MO, Egonmwan RI, Saliu JK (2010) Herpetological surveys of South-western and South-eastern regions of Nigeria. Zoologist 8:34–43
Ozemoka HJ, Aisien MSO (2017) Anuran fauna in Agbede, a savannah – mosaic zone in Edo State, Nigeria. In: 12th Annual Conference of Zoological Society of Nigeria, Federal University of Technology, Minna
Portik DM, Jongsma GFM, Kouete MT, Scheinberg LA, Freiermuth B, Tapondjou WP, Blackburn DC (2016) A survey of amphibians and reptiles in the foothills of Mount Kupe, Cameroon. Amphib Reptile Conserv 10(2):37–67 (e131)
Rahman MM, Nneji LM, Adeniyi AC et al (2020) Amphibian assemblages and diversity patterns in two forest ecosystems of South-Eastern Nigeria. Afr J Ecol 00:1–13. https://doi.org/10.1111/aje.12776
Reid JC, Owens A, Laney R (1990) Records of frogs and toads from Akwa Ibom State. Nigerian Field 55:113–128
Rockney HJ, Ofori-Boateng C, Porcino A, Leache AD (2015) A comparison of DNA barcoding markers in West African frogs. Afr J Herpetol 64(2):135–147. https://doi.org/10.1080/21564574.2015.1114530
Rödel MO (2000) Herpetofauna of West Africa. vol. I. Amphibians of the West African Savanna. Edition Chimaira, Frankfurt am Main
Rödel MO, Branch WR (2002) Herpetological survey of the Haute Dodo Cavally forests, Western Ivory Coast. Salamandra 38(4):245–268
Romer JD (1953) Reptiles and amphibians collected in the Port Harcourt area of Nigeria. Copeia 2:121–123. https://doi.org/10.2307/1440145
Saunders DA, Hobbs RJ, Margules CR (1991) Biological consequences of ecosystem fragmentation: A review. Conserv Biol 5:18–32
Schiotz A (1963) The amphibians of Nigeria. Vidensk Medd Dansk Naturh Foren 125:1–92
Schiøtz A (1966) On a collection of Amphibia from Nigeria. Vidensk Medd Dansk Naturh Foren 129:43–48
Schiøtz A (1967) The treefrogs (Rhacophoridae) of West Africa. Spol Zool Musei Haun 25:1–346
Schiøtz A (1999) Treefrogs of Africa. Edition Chimaira, Frankfurt am Main
Shaffer ML (1981) Minimum population size for species conservation. Bioscience 31:131–134. https://doi.org/10.2307/1308256
Shannon CE, Weaver W (1949) The mathematical theory of communication. University of Illinois Press, Urbana
Simpson EH (1949) Measurement of diversity. Nature 163:688. https://doi.org/10.1038/163688a0
Sinsch U (1991) Mini Review: The orientation behaviour of amphibians. J Herpetol 1:541–544
Soetaert K, Heip C (1990) Sample-size dependence of diversity indices and the determination of sufficient sample size in a high diversity deep sea environment. Mar Ecol Prog Ser 59:305–307. https://doi.org/10.3354/meps059305
Sokal RR, Michener MDC (1958) A statistical method for evaluating systematic relationships. Univ Kans Sci Bull 38(2):1409–1438
Sørensen T (1948) A method of establishing groups of equal amplitude in plant sociology based on similarity of species and its application to analyses of the vegetation on Danish commons. K Dan Vidensk Selsk Biol Skr 5(4):1–34
Soulé ME (1987) Variable population for conservation. Cambridge University Press, New York
Stuart SN, Chanson JS, Cox NA, Young BE, Rodrigues AS et al (2004) Status and trends of amphibian declines and extinctions worldwide. Science 306:1783–1786. https://doi.org/10.1126/science.1103538
Vallan D (2000) Influence of forest fragmentation on amphibian diversity in the nature of Ambohitantely highland Madagascar. Biol Conserv 96:31–43. https://doi.org/10.1016/S0006-3207(00)00041-0
Wake DB, Vredenburg VT (2008) Are we in the midst of the sixth mass extinction? A review from the world of amphibians. Proc Natl Acad Sci USA 105:11466–11473. https://doi.org/10.1073/pnas.0801921105
Walker RB (1968) The amphibians of Zaria, in the northern Guinea Savannah, Nigeria. Copeia 1968:164–167. https://doi.org/10.2307/1441565
Werner EE, Glennemeier KS (1999) Influence of forest canopy cover on the breeding pond distributions of several amphibian species. Copeia 1:1–12. https://doi.org/10.2307/1447379
Whittaker RH (1972) Evolution and measurement of species diversity. Taxon 21:213–251. https://doi.org/10.2307/1218190
Zimmerman B, Peres C, Malcolm J, Turner T (2001) Conservation and development alliances with the Kayapo of south-eastern Amazonia, a tropical forest indigenous people. Environ Conserv 28:10–22. https://doi.org/10.1017/S0376892901000029
Acknowledgements
Funding for this research was provided by the US National Geographic Society Early Career Grant under Grant no. EC-357 C-18. We thank the management of the National Park Service in Abuja, Nigeria, for providing permission and technical assistance for the field survey. We are grateful to the rangers at the Cross River National Park, and Kelechi Ilobi for their help during the field survey.
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Study design: LMN, ACA; fieldwork: LMN, ACA, BEA, OO, ABO, EAE, AOA, AO, JYU, ABA, ICN, OAU, AAAU, AOA, CSO; data analysis: LMN, AVA, SOO, MMR; writing: LMN.
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Permission to collect data and animal specimens (NPH/GEN/121/XXV/461) from Cross River National Park was obtained from the National Park Service Headquarter, Abuja, Nigeria.
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Nneji, L.M., Adeola, A.C., Adedeji, B.E. et al. Species richness, distribution pattern, and conservation status of amphibians in Cross River National Park, south‐eastern Nigeria. Biologia 76, 2573–2588 (2021). https://doi.org/10.1007/s11756-021-00751-8
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DOI: https://doi.org/10.1007/s11756-021-00751-8