Morphological Variation Of Wild Dogs Across Africa

• Main Author: Tafadzwa Shumba
• Format: Text
• Language: unknown
• Published: Zenodo 2017
• Subjects: Bergmann's rule, Photogrammetry, Lycaon pictus resource rule, Shoulder height.; 10.5281/zenodo.1311753; Blackburn; Burton; Ferreira; Hinks; Rasmussen; Rodriguez; Elephant Seal; Southern Elephant Seal
• Online Access: https://dx.doi.org/10.5281/zenodo.1311752; https://zenodo.org/record/1311752

Body form and function of animal species have been shaped over time in response to prevailing local conditions that affect survival and reproduction. Morphological variation in size and shape thus occurs within-species across eco-geographic regions. Different theories have been proposed to explain this variation. For example, Bergmann’s rule posits that intra-species body size increases positively with latitude and negatively with temperature. Alternatively, the resource rule suggests that the quantity and quality of available resources is the primary determinant of body shape and size. Here, we used photogrammetry to quantify morphological variation among wild dogs (Lycaon pictus) across eight African countries within three regions (western, eastern and southern), using the skeletal ratio of shoulder height to body length. We found that morphological variation was explained mostly by country and region, with latitude also being an influential predictor. Wild dogs in eastern Africa (Kenya and Tanzania) had the lowest measured skeletal ratio while the western population especially in Senegal had the highest. The effect of latitude, although not strongly linear, suggests some support for Bergmann’s rule. However, variations in latitude are associated with changes in other environmental conditions that directly influence resource availability. This makes the resource rule a better theory to explain morphological variation among wild dogs. Nevertheless, these findings indicate phenotypic plasticity among wild dog populations which can be taken as basis for rigorous genetic comparisons. Also, these remaining populations should all be conserved regardless of current size and movement between them should occur naturally without translocation especially for populations which are phenotypically distinct. : {"references": ["Andrews, P., 2007. Adobe Photoshop CS3 A-Z: Tools and features illustrated ready reference. Focal Press, Armsterdam.", "Angwafo, T., 2006. Status of Wildlife and its Utilisation in Faro and Benou\u00e9 National Parks North Cameroon: Case study of the Derby Eland (Taurotragus derbianus gigas Gray, 1947) and the African Wild Dog (Lycaon pictus Temminck, 1840). Brandenburg Technical University, Cottbus, Germany.", "Bekoff, M., Diamond, J. and Mitton, J., 1981. Life-history patterns and sociality in canids: body size, reproduction and behaviour. Oecologia, 50, 386-390", "Bell, C.M., Hindell, M.A. and Burton, H.R., 1997. Estimation of body mass in the southern elephant seal, Mirounga leonia, by photogrametry and morphometrics. Mar. Mamm. Sci., 13, 669-682.", "Blackburn, T.M., and Hawkins, B.A., 2004. Bergmann's rule and the mammal fauna of northern North America. Ecography, 27, 715-724.", "Boast, L.K., Houser, A.N., Good, K. and Gusset, M., 2013. Regional variation in body size of the cheetah (Acinonyx jubatus). J. Mammal., 94, 1293-1297.", "Breuer, T., 2003. Distribution and conservation of African wild dogs in Cameroon. Canid News.", "Burnham, K.P. and Anderson, D.R., 2002. Model selection and multimodel inference. 2and edition. Springer, New York. Cavallini, P.,", "Clarke, G., 1995. Relationships between developmental stability and fitness. Conserv. Biol., 9, 18-24.", "Croes, B., Rasmussen, G.S.A., Buij, R. and de Longh, H., 2012. Status of the African wild dog in the B\u00e9nou\u00e9 Complex, North Cameroon.", "Dehnel, A., 1949. Studies on the genus Sorex L. Ann Univ Marie Curie Sklodowska Section C. Biology, 4, 1674-1684.", "Dickman, A.J., Hinks, A.E., Macdonald, E.A., Burnham, D. and Macdonald, D.W., 2015. Priorities for global felid conservation. Conserv. Biol., 29, 854-864.", "Edwards, C., Rasmussen, G.S.A., Riordan, P., Courchamp, F. and Macdonald, D.W., 2013. Non-adaptive phenotypic evolution of the endangered carnivore Lycaon pictus. PLoS ONE, 8, 1-7.", "Ferreira, S., and Funston, P.J., 2010. Age assignment to individual African lions. S. Afr. J. Wildl. Res., 40,1-9.", "Girman, D.J., Kat, P.W., Mills, M.G.L., Ginsberg, J.R., Borner, M., Wilson, V., Fanshawe, J.H., Fitzgibbon, C., Lau, L.M., and Wayne, R.K. 1993. Molecular genetic and morphological analyses of the African wild dog (Lycaon pictus). J. Hered., 84, 450-459.", "Girman, D.J., Mills, M.G.L., Geffen, E., and Wayne, R.K. 1997. A molecular genetic analysis of social structure, dispersal, and interpack relationships of the African wild dog (Lycaon pictus). Behav. Ecol. Sociobiol., 40, 187-198.", "Girman, D. J., Vila, C., Geffen, E., Creel, S., Mills, M. G. L., McNutt, J. W., Ginsberg, J. R., Kat, P. W., Mamiya, K. H., and Wayne, R. K. 2001. Patterns of population subdivision, gene flow and genetic variability in the African wild dog (Lycaon pictus). Mol. Ecol., 10:1703-1723.", "Reich, A., 1981. The behavior and ecology of the African wild dog (Lycaon pictus) in the Kruger National Park. Dissertation Abstracts International B Sciences and Engineering.", "Rensch, B., 1938. Some problems of geographical variation and species formation. Proc. Linn. Soc. London, 150, 275-285.", "Rodriguez, M.A., Olalla-Tarraga, M.A. and Hawkins, B.A., 2010. Bergmann's and the geography of mammal body size in the Western Hemisphere. Global Ecol. Biogeogr., 17, 274-283.", "Shrader, A.M., Ferreira, S.M., and van Aarde, R.J., 2005. Digital photogrametry and laser rangefinder techniques to measure African elephants. S. Afr. J. Wildl. Res., 36, 1-7.", "Sillero-Zubiri, C. 1995. A survey of African wild dogs in southeastern Senegal. Canid News, 3, 33-35.", "Stanley, S.M., 1973. An explanation for Cope's rule. Evolution, 27, 1-26.", "Trimble, M.J., Van Aarde, R.J., Ferreira, S.M., Norgaard, C.F., Johan Fourie, J., Lee, P.C. and Moss, C.J., 2011. Age determination by back length for African savanna elephants: extending age assessment techniques for aerial-based surveys. PLoS ONE 6:e26614.", "Woodroffe, R., Ginsberg, J.R. and Macdonald, D.W. 1997. The African Wild Dog: Status Survey and Conservation Action Plan. IUCN/SSC Canid Specialist Group, Gland, Switzerland.", "Yom-Tov, Y. and Geffen, E., 2006. Geographic variation in body size: The effects of ambient temperature and precipitation. Oecologia, 148, 213-218.", "Yom-Tov, Y. and Geffen, E., 2011. Recent spatial and temporal changes in body size of terrestial vertebrates: probable causes and pitfalls. Biol. Rev., 86, 531-541."]}