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hw2_dispersal_limitations_of_mammals_in_Mexico

hw2_dispersal_limitations_of_mammals_in_Mexico - Journal of...

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ORIGINAL ARTICLE Dispersal limitation and geographical distributions of mammal species Mariana Munguı´a 1 *, Andrew Townsend Peterson 2 and ´ctor Sa ´nchez-Cordero 1 1 Instituto de Biologı´a, Universidad Nacional Auto ´noma de Me´xico, Distrito Federal, Me´xico, 2 Natural History Museum and Biodiversity Research Center, The University of Kansas, Lawrence, KS, USA *Correspondence: Mariana Munguı ´a, Museo Nacional de Ciencias Naturales, CSIC, Jose ´ Gutierrez Abascal 2, Madrid 28006, Spain. E-mail: [email protected] ABSTRACT Aim To relate the dispersal limitation of endemic terrestrial mammals in Mexico to species life-history traits and latitude. Location Mexico. Methods We modelled species ecological niches projected as potential distributions ( P ) using point occurrence data and 19 environmental variables for 89 endemic mammal species, and compared the areas covered by these ecological niche models with maps of species actual distributions ( R ) based on minimum convex polygons connecting marginal records based on museum specimens. We correlated body mass, food habits (herbivore, omnivore, insectivore, frugivore/granivore), volant and non-volant (fossorial, arboreal, terrestrial) habits and mean latitude to the proportion of occupancy of species potential distributional areas ( R / P ). Results R and P were significantly positively correlated, with an overall average R / P ratio of 0.49. Less than half of the endemics (41 species) had a high occupancy ( R / P values ranging from 0.50 to 0.90); a few (four species) showed full occupancy (> 0.90). Body mass and food habits were not correlated with R / P , but latitude showed significant correlations with R / P ; volant mammals tended to show higher R / P values than non-volant mammals. Main conclusions Few species filled most of the spatial extent of their ecological niches. Life-history traits were generally poor predictors of proportional occupancy of species potential distributions. Endemics occurring at higher latitudes showed higher occupancy, suggesting that abiotic factors are likely to limit their distributions. Conversely, species at lower latitudes showed lower occupancy, suggesting that their distributions are limited by biotic factors and/or by geographical or historical barriers that prevent dispersal. The dispersal abilities of volant compared with non-volant endemics can explain the higher occupancy in species potential distributions in the former group. These trends provide a baseline for exploring the importance of life-history traits and abiotic versus biotic factors in limiting species distributions. Keywords Abiotic factors, bioclimatic models, dispersion, endemic species, geographical distributions, latitude, life-history traits, mammals, Mexico, potential distribution. Journal of Biogeography ( J. Biogeogr .) (2008) 35 , 1879–1887 ª 2008 The Authors www.blackwellpublishing.com/jbi 1879 Journal compilation ª 2008 Blackwell Publishing Ltd doi:10.1111/j.1365-2699.2008.01921.x
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INTRODUCTION A fundamental question in biogeography is: ‘what factors limit species geographical distributions?’ (Dobzhansky, 1950;
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