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Afromontane small mammals do not follow the hump-shaped rule: altitudinal variation in the Soutpansberg Mountains, South Africa

Published online by Cambridge University Press:  08 December 2014

Peter John Taylor*
Affiliation:
South African Research Chair on Biodiversity Value and Change, School of Mathematical & Natural Science, University of Venda, P Bag X5050, Thohoyandou 0950, South Africa Centre for Invasion Biology, University of Stellenbosch, Stellenbosch, South Africa School of Life Sciences, University of KwaZulu-Natal, Durban, South Africa
Aubrey Munyai
Affiliation:
Ekurhuleni Metropolitan Municipality, Environmental Protection and Resilience, First Floor City House Building, Corner Margaret and Long Street, Kempton Park 1619, South Africa Department of Ecology & Resource Management, School of Environmental Sciences, University of Venda, P Bag X5050, Thohoyandou 0950, South Africa
Ian Gaigher
Affiliation:
South African Research Chair on Biodiversity Value and Change, School of Mathematical & Natural Science, University of Venda, P Bag X5050, Thohoyandou 0950, South Africa
Rod Baxter
Affiliation:
Department of Ecology & Resource Management, School of Environmental Sciences, University of Venda, P Bag X5050, Thohoyandou 0950, South Africa
*
1Corresponding author. Email: peter.taylor.univen@gmail.com

Abstract:

Altitudinal transects of biodiversity are important to understanding macro-ecological patterns. Hump-shaped altitudinal profiles in species richness are a common pattern in terrestrial small-mammal communities studied previously mostly in New World mountain ranges. Based on capture–mark–recapture live-trapping conducted over four seasons (four nights per session) along an altitudinal transect from 1000 to 1747 m asl on the southern slopes of the Soutpansberg Mountains of northern South Africa, we recorded 12 species of small mammal, including nine rodents, two shrews and one elephant shrew (sengi). Three species of rodent and the sengi dominated the communities whilst six species were recorded with three or fewer captures. Although we found no effect of season, we found a significant linear increase in terrestrial small-mammal richness (but not Simpson's diversity, D) with altitude in the Soutpansberg Mountains located just north of the Tropic of Capricorn in South Africa. This trend could best be explained by an increase in the proportion of rocky cover and a change in vegetation from savanna to grassland. Peak densities of three common rodent species and one common insectivore varied from 10 ha−1 (Elephantulus myurus) to 54 ha−1 (Micaelamys namaquensis) and density showed no significant variation with season. However, density either declined (Aethomys ineptus) or increased (Rhabdomys dilectus and Elephantulus myurus) significantly with altitude; this variation was best explained by the proportion of rocky cover. Seasonal variation had a significant effect on body mass of two rodent species. A review of small-mammal studies from major mountain ranges in Africa and Madagascar found that the hump-shaped pattern is not common. Declines in richness with increasing altitude as well as cases of no significant altitudinal change were the most common patterns noted. Tropical African mountains (including the Soutpansberg with 27 species) have far higher small-mammal diversity than temperate African mountains.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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References

LITERATURE CITED

AVENANT, N. L. & CAVALLINI, P. 2007. Correlating rodent community structure with ecological integrity, Tussen-die-Riviere Nature Reserve, Free State province, South Africa. Integrative Zoology 2:212219.CrossRefGoogle ScholarPubMed
AVENANT, N. L., WATSON, J. P. & SCHULZE, E. 2008. Correlating small mammal community characteristics and habitat integrity in the Caledon Nature Reserve, South Africa. Mammalia 72:186191.CrossRefGoogle Scholar
BERGER, K., CRAFFORD, J. E., GAIGHER, I., GAIGHER, M. J., HAHN, N. & MACDONALD, I. 2003. A first synthesis of the environmental, biological & cultural assets of the Soutpansberg. Leach Printers & Signs CC, Louis Trichardt. 62 pp.Google Scholar
BERGMANN, C. 1847. Über die Verhältnisse der Wärmeökonomie der Thiere zu Ihrer Grösse. Göttinger Studien 3:595708.Google Scholar
BOND, W., FERGUSON, M. & FORSYTH, G. 1980. Small mammals and habitat structure along altitudinal gradients in the southern Cape mountains. South African Journal of Zoology 15:3443.CrossRefGoogle Scholar
BROWN, J. H. 2001. Mammals on mountainsides: elevational patterns of diversity. Global Ecology and Biogeography 10:101109.Google Scholar
CASTIGLIA, R., SOLANO, E., MAKUNDI, R. H., HULSELMANS, J., VERHEYEN, E. & COLANGELO, P. 2012. Rapid chromosomal evolution in the mesic four-striped grass rat Rhabdomys pumilio (Rodentia, Muridae) revealed by mtDNA phylogeographic analysis. Journal of Zoological Systematics and Evolutionary Research 50:165172.Google Scholar
CLAUSNITZER, V. & KITYO, R. 2001. Altitudinal distribution of rodents (Muridae and Gliridae) on Mt Elgon, Uganda. Tropical Zoology 14:95118.Google Scholar
COLWELL, R. K. & LEES, D. C. 2000. The mid-domain effect: geometric constraints on the geography of species richness. Trends in Ecology and Evolution 15:7076.Google Scholar
COLWELL, R. K. & RANGEL, T. F. 2010. A stochastic, evolutionary model for range shifts and richness on tropical elevational gradients under Quaternary glacial cycles. Philosophical Transactions of the Royal Society B: Biological Sciences 365:36953707.CrossRefGoogle ScholarPubMed
COLWELL, R. K., RAHBEK, C. & GOTELLI, N. J. 2004. The mid-domain effect and species richness patterns: what have we learned so far? American Naturalist 163:E1–E23.Google Scholar
CURRAN, M., KOPP, M., BECK, J. & FAHR, J. 2012. Species diversity of bats along an altitudinal gradient on Mount Mulanje, southern Malawi. Journal of Tropical Ecology 28:243253.Google Scholar
DENYS, C., MISSOUP, A. D., TCHIENGUE, B., ACHOUNDONG, G., EKOBO, A., BILONG BILONG, C. F., LEMBE, D. M. & NICOLAS, V. 2009. Altitudinal distribution and anthropogenic influence on small mammal assemblages on Mount Kupe, SW Cameroon. Bonner zoologische Beiträge 56:159173.Google Scholar
DU TOIT, N., VAN VUUREN, B. J., MATTHEE, S. & MATTHEE, C. A. 2012. Biome specificity of distinct genetic lineages within the four-striped mouse Rhabdomys pumilio (Rodentia: Muridae) from southern Africa with implications for taxonomy. Molecular Phylogenetics and Evolution 65:7586.Google Scholar
ELLISON, G. T. H., BRONNER, G. N. & TAYLOR, P. J. 1993. Is the annual cycle in body weight of pouched mice (Saccostomus campestris) the result of seasonal changes in adult size or population structure? Journal of Zoology (London) 229:545551.Google Scholar
ENGELBRECHT, A., TAYLOR, P. J., DANIELS, S. R. & RAMBAU, R. V. 2011. Cryptic speciation in the southern African vlei rat, Otomys irroratus complex: evidence derived from mitochondrial cyt b and niche modeling. Biological Journal of the Linnean Society 104:192206.Google Scholar
FOORD, S. H., MAFADZA, M., DIPPENAAR-SCHOEMAN, A. S. & VAN RENSBURG, B. J. 2008. Micro-scale heterogeneity of spiders (Arachnida: Araneae) in the Soutpansberg, South Africa: a comparative survey and inventory in representative habitats. African Zoology 43:156174.Google Scholar
GOODMAN, S. M. & RASOLONANDRASANA, B. P. N. 2001. Elevational zonation of birds, insectivores, rodents and primates on the slopes of the Andringitra Massif, Madagascar. Journal of Natural History 35:285305.Google Scholar
GOTELLI, N. J. & COLWELL, R. K. 2001. Quantifying biodiversity: procedures and pitfalls in the measurement and comparison of species richness. Ecology Letters 4:379391.Google Scholar
HAHN, N. 2002. Endemic flora of the Soutpansberg. University of KwaZulu-Natal, Pietermaritzburg. 219 pp.Google Scholar
HAPPOLD, D. C. D. & HAPPOLD, M. 1992. The ecology of three communities of small mammals at different altitudes in Malawi, Central Africa. Journal of Zoology, London 228: 81101.Google Scholar
HEANEY, L. R., HEIDEMAN, P. D., RICKART, E. A., UTZURRUM, R. B. & KLOMPEN, J. S. H. 1989. Elevational zonation of mammals in the central Philippines. Journal of Tropical Ecology 5:259280.CrossRefGoogle Scholar
JETZ, W. & RAHBEK, C. 2001. Geometric constraints explain much of the species richness pattern in African birds. Proceedings of the National Academy of Sciences USA 98:56615666.Google Scholar
KASANGAKI, A., KITYO, R. & KERBIS, J. 2003. Diversity of rodents and shrews along an elevational gradient in Bwindi Impenetrable National Park, south-western Uganda. African Journal of Ecology 41:115123.Google Scholar
KOK, A. D., PARKER, D. M. & BARKER, N. P. 2012. Life on high: the diversity of small mammals at high altitude in South Africa. Biodiversity and Conservation 21:28232843.Google Scholar
KRYŠTUFEK, B., DONEV, N. R. & SKOK, J. 2011. Species richness and distribution of non-volant small mammals along an elevational gradient on a Mediterranean mountain. Mammalia 75:311.Google Scholar
LECOMPTE, E., APLIN, K., DENYS, C., CATZEFLIS, F., CHADES, M. & CHEVRET, P. 2008. Phylogeny and biogeography of African Murinae based on mitochondrial and nuclear gene sequences, with a new tribal classification of the subfamily. BMC Evolutionary Biology 8:199, doi:10.1186/1471-2148-8-199.Google Scholar
LINDEN, V. M. G., WEIER, S. M., GAIGHER, I., KUIPERS, H. I., WETERINGS, M. J. A. & TAYLOR, P. J. 2014. Changes of bat activity, species richness, diversity and community composition over an altitudinal gradient in the Soutpansberg range, South Africa. Acta Chiropterologica 16:2740.Google Scholar
LINZEY, A. V., KESNER, M. H., CHIMIMBA, C. T. & NEWBERY, C. 2003. Distribution of veld rat sibling species Aethomys chrysophilus and Aethomys ineptus (Rodentia: Muridae) in southern Africa. African Zoology 38:169174.Google Scholar
MAGURRAN, A. E. 2004. Measuring biological diversity. Blackwell Science, Oxford. 256 pp.Google Scholar
MASSAWE, A. W., MULUNGU, L. S., MAKUNDI, R. H., DLAMINI, N., EISEB, S. J., KIRSTEN, F., MAHLABA, T., MALEBANE, P., VON MALTITZ, E., MONADJEM, A., TAYLOR, P., TUTJAVI, V. & BELMAIN, S. R. 2011. Spatial and temporal population dynamics of rodents in three geographically different regions: implication for ecologically based rodent management. African Zoology 46:393405.Google Scholar
MCCAIN, C. M. 2004. The mid-domain effect applied to elevational gradient: species richness in Costa Rica. Journal of Biogeography 31:1931.Google Scholar
MCCAIN, C. M. 2005. Elevational gradients in diversity of small mammals. Ecology 86:366–372.CrossRefGoogle Scholar
MCCAIN, C. M. 2007a. Area and mammalian elevational diversity. Ecology 88:7686.Google Scholar
MCCAIN, C.M. 2007b. Could temperature and water availability drive elevational diversity? A global case study for bats. Global Ecology and Biogeography 16:113.Google Scholar
MENA, J. L. & VÁZQUEZ-DOMÍNGUEZ, E. 2005. Species turnover on elevational gradients in small rodents. Global Ecology and Biogeography 14:539547.Google Scholar
MONADJEM, A. 2005. Association between avian communities and vegetation structure in low-lying woodland-savanna ecosystem in Swaziland. Ostrich 76:45–55.Google Scholar
MONADJEM, A., TAYLOR, P. J., DENYS, C. & COTTERILL, F. P. D. In press. Rodents of Sub-Saharan Africa; a biogeographic and taxonomic synthesis. De Gruyter, Berlin.Google Scholar
MUCINA, L. & RUTHERFORD, M. C. 2006. The vegetation of South Africa, Lesotho and Swaziland. Strelitzia 19. South African National Biodiversity Institute, Pretoria. 807 pp.Google Scholar
MULLIN, S. K., PILLAY, N. & TAYLOR, P. J. 2005. The distribution of the water rat Dasymys (Muridae) in Africa: a review. South African Journal of Science 101:117124.Google Scholar
MULUNGU, L. S., MAKUNDI, R. H., MASSAWE, A. W., MACHANG’U, R. S. & MBIJE, N E. 2008. Diversity and distribution of rodent and shrew species associated with variations in altitude on Mount Kilimanjaro, Tanzania. Mammalia 72:178185.Google Scholar
MUNYAI, A. 2014. Biodiversity of terrestrial small mammals along an altitudinal transect in the Soutpansberg, Limpopo Province, South Africa. MSc thesis, University of Venda. 65 pp.Google Scholar
MUNYAI, T. C. & FOORD, S. H. 2012. Ants on a mountain: spatial, environmental and habitat associations along an altitudinal transect in a centre of endemism. Journal of Insect Conservation 16:677695.CrossRefGoogle Scholar
NEMAKHAVHANI, T. 2014. Spatial and reproductive differentiation of small terrestrial mammals in a complex environment in the western Soutpansberg Mountain, Limpopo province. MSc thesis, University of Venda, Thohoyandou, South Africa. 74 pp.Google Scholar
NEWBERY, C. H. 1999. A key to the Soricidae, Macroscelididae, Gliridae and Muridae of Gauteng, North West, Mpumalanga, and the Northern Province, South Africa. Koedoe 42:5155.Google Scholar
PATTERSON, B. D., STOTZ, D. F., SOLARI, S., FITZPATRICK, J. W. & PACHECO, V. 1998. Contrasting patterns of elevational zonation for birds and mammals in the Andes of Southeastern Peru. Journal of Biogeography 25:593607.Google Scholar
RAHBEK, C. 1995. The elevational gradient of species richness: a uniform pattern? Ecography 18:200205.Google Scholar
ROWE, R. J. 2009. Environmental and geometric drivers of small mammal diversity along elevational gradients in Utah. Ecography 32:411422.Google Scholar
ROWE-ROWE, D. T. & MEESTER, J. 1982. Habitat preferences and abundance relations of small mammals in the Natal Drakensberg. South African Journal of Zoology 17:202209.Google Scholar
SIKES, R. S., GANNON, W. L. & THE ANIMAL CARE AND USE COMMITTEE OF THE AMERICAN SOCIETY OF MAMMALOGISTS 2011. Guidelines of the American Society of Mammalogists for the use of wild mammals in research. Journal of Mammalogy 92:235253.Google Scholar
STANLEY, W. T. & HUTTERER, R. 2007. Differences in abundance and species richness between shrews and rodents along an elevational gradient in the Udzungwa Mountains, Tanzania. Acta Theriologica 52:261275.Google Scholar
SYMONDS, A. R. E. & MOUSSALLI, A. 2011. A brief guide to model selection, multimodel inference and model averaging in behavioural ecology using Akaike's information criterion. Behavioral Ecology and Sociobiology 65:1321.Google Scholar
TAYLOR, P. J., MAREE, S., SANDWYK, J., BAXTER, R. & RAMBAU, R. V. 2009. When is a species not a species? Uncoupled phenotypic, karyotypic and genotypic divergence in two species of South African laminate-toothed rats (Murinae: Otomyini). Journal of Zoology (London) 277:317332.Google Scholar
TAYLOR, P. J., SOWLER, S., SCHOEMAN, M. C. & MONADJEM, A. 2013. Diversity of bats in the Soutpansberg and Blouberg Mountains of northern South Africa: complementarity of acoustic and non-acoustic survey methods. South African Journal of Wildlife Research 43:1226.CrossRefGoogle Scholar
VAN WYK, A. E. & SMITH, G. F. 2001. Regions of floristic endemism in Southern Africa. Umdaus Press, Pretoria. 199 pp.Google Scholar
WILLIAMS, S. E., MARSH, H. & WINTER, J. 2002. Spatial scale, species diversity, and habitat structure: small mammals in Australian tropical rain forest. Ecology 83:13171329.Google Scholar
WILLIAMS, S. E., SHOO, L. P., HENRIOD, R. & PEARSON, R. G. 2010. Elevational gradients in species abundance, assemblage structure and energy use of rainforest birds in the Australian Wet Tropics bioregion. Austral Ecology 35:650664.Google Scholar
YALDEN, D. 1988. Small mammals of the Bale Mountains, Ethiopia. African Journal of Ecology 26:281294.Google Scholar
YOM-TOV, Y. & GEFFEN, E. 2011. Recent spatial and temporal changes in body size of terrestrial vertebrates: probable causes and pitfalls. Biological Reviews of the Cambridge Philosophical Society 86:531541.Google Scholar
YOM-TOV, Y., YOM-TOV, S., WRIGHT, J., THORNE, C. J. R. & DU FEU, R. 2006. Recent changes in body weight and wing length among some British passerine birds. Oikos 112:91101.CrossRefGoogle Scholar
YOM-TOV, Y., ROOS, A., MORTENSEN, P., WIIG, O., YOM-TOV, S. & HEGGBERGET, T. M. 2010. Recent changes in body size of the Eurasian Otter Lutra lutra in Sweden. Ambio 39:496503.Google Scholar