Data from: Habitat amount hypothesis and passive sampling explain mammal species composition in Amazonian river islands
Rabelo, Rafael M., National Institute of Amazonian Research
Aragón, Susan, Federal University of Western Pará
Bicca-Marques, Júlio César, Pontifical Catholic University of Rio Grande do Sul
Nelson., Bruce W., National Institute of Amazonian Research
Published Nov 12, 2018 on Dryad.
Cite this dataset
Rabelo, Rafael M.; Aragón, Susan; Bicca-Marques, Júlio César; Nelson., Bruce W. (2018). Data from: Habitat amount hypothesis and passive sampling explain mammal species composition in Amazonian river islands [Dataset]. Dryad. https://doi.org/10.5061/dryad.p05t5d0
Nested structures of species assemblages have been frequently associated with patch size and isolation, leading to the conclusion that colonization-extinction dynamics drives nestedness. The ‘passive sampling’ model states that the regional abundance of species randomly determines their occurrence in patches. The ‘habitat amount hypothesis’ also challenges patch size and isolation effects, arguing that they occur because of a 'sample area effect'. Here we (1) ask whether the structure of the mammal assemblages of fluvial islands shows a nested pattern, (2) test whether species’ regional abundance predicts species’ occurrence on islands, and (3) ask whether habitat amount in the landscape and matrix resistance to biological flow predict the islands’ species composition. We quantified nestedness and tested its significance using null models. We used a regression model to analyze whether a species’ relative regional abundance predicts its incidence on islands. We accessed islands’ species composition by an NMDS ordination and used multiple regression to evaluate how species composition responds to habitat amount and matrix resistance. The degree of nestedness did not differ from that expected by the passive sampling hypothesis. Likewise, species’ regional abundance predicted its occurrence on islands. Habitat amount successfully predicted the species composition on islands, whereas matrix resistance did not. We suggest the application of habitat amount hypothesis for predicting species composition in other patchy systems. Although the island biogeography perspective has dominated the literature, we suggest that the passive sampling perspective is more appropriate for explaining the assemblages’ structure in this and other non-equilibrium patch systems.
These data are a product of Rafael Rabelo’s Master thesis, conducted at the Ecology Graduate Program of Brazil´s National Institute for Amazon Research (INPA), with logistical and financial support from Mamirauá Institute for Sustainable Development (IDSM-OS/MCTIC). The aim of the research was to evaluate the pattern of mammal distribution in fluvial islands and to understand the factors that drive species distribution.
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