Abstract
In this study, we evaluate the effects of spatial and environmental factors on the structure of tadpole assemblages in Central Amazonia testing the following hypotheses: (1) environmental factors are more important than spatial ones in tadpole richness distribution and (2) habitat structure variables are more important than biotic variables in tadpole richness distribution. Tadpoles were sampled at 20 riparian plots between February and June 2010. Spatial and environmental components explained the major part of the variation in observed and estimated tadpole richness, respectively. Among all fitted models, the best model that explains species richness distribution is the one that contains only the number of ponds. Our results showed that tadpole richness in streamside ponds is influenced by niche-based processes and can be explained by local factors related to habitat structure. Predator density was not an important biotic factor in our study, contradicting the results found by other studies conducted in tropical areas. However, neutral processes are also important because spatial variation can explain the spatial distribution of species richness, probably as a result of dispersal limitation. Therefore, our results contribute to understanding of the local and landscape features which influence the amphibian species diversity in a tropical forest.
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Acknowledgments
We are grateful to Marco A. Mendonça for logistic support and facilities at Fazenda UFAM. Anne d’Heursel for reviewing the English. E. Venticinque, R. Da Silveira, M.E. Oliveira, J. Zuanon, and F. Costa and anonymous reviewers for constructive comments on earlier drafts. J. Zuanon for fish identification. Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) for collection permits (# 11323-1). Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (# 470375/2006-0, 558318/2009-6), Fundação de Amparo à Pesquisa do Estado do Amazonas (FAPEAM # 586/10), SISBIOTA Program: CNPq (#563075/2010-4), and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP#10/52321-7) for financial support. This study was supported by graduate fellowship from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) to APA and a Research Productivity grant from CNPq to MM and DJR. MVG received a fellowship from CNPq (# 159946/2012-3). The Fazenda UFAM is part of the Programa de Pesquisa em Biodiversidade (PPBio) of the Brazilian Ministry of Science, Technology and Innovation (MCTI). This is contribution 37 of the Projeto Igarapés.
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de Almeida, A.P., de Jesus Rodrigues, D., Garey, M.V. et al. Tadpole richness in riparian areas is determined by niche-based and neutral processes. Hydrobiologia 745, 123–135 (2015). https://doi.org/10.1007/s10750-014-2099-7
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DOI: https://doi.org/10.1007/s10750-014-2099-7