Artículos de revistas
Additive Partitioning Of Butterfly Diversity In A Fragmented Landscape: Importance Of Scale And Implications For Conservation
Registro en:
Diversity And Distributions. , v. 14, n. 6, p. 961 - 968, 2008.
13669516
10.1111/j.1472-4642.2008.00505.x
2-s2.0-54049118017
Autor
Ribeiro D.B.
Prado P.I.
Brown Jr. K.S.
Freitas A.V.L.
Institución
Resumen
Aim: Most of the Atlantic Forest in Brazil occurs in fragments of various sizes. Previous studies indicate that forest fragmentation affects fruit-feeding butterflies. Conservation strategies that seek to preserve organisms that are distributed in high-fragmented biomes need to understand the spatial distribution of these organisms across the landscape. In view of the importance of understanding the fauna of these forest remnants, the objective of the present work is to investigate the extent to which the diversity of this group varies across spatial scales ranging from within-forest patches to between landscapes. Location: South America, south-eastern Brazil, São Paulo State. Methods: We used bait traps to sample fruit feeding butterflies at 50 points in 10 fragments in two different landscapes during a period of 12 months. Total species richness and Shannon index were partitioned additively in diversity at trap level, and beta diversity was calculated among traps, among forest patches, and between landscapes. We used permutation tests to compare these values to the expected ones under the null hypothesis that beta diversity is only a random sampling effect. Results: There was significant beta diversity at the smallest scale examined; however, the significance at higher scales depends on the diversity measurement used. Beta diversity with Shannon index was smaller than expected by chance among fragments, whereas species richness was not. Among landscapes, only beta diversity in richness was higher than expected by chance. Main conclusions: The results observed occur because there is great variability in species composition among forest patches in the same landscape, changing this diversity even though the communities are formed from the same pool of species. At the largest scale evaluated (between landscapes), these pattern changes and differences in beta diversity in richness were detectable. This difference is probably caused by the presence of rare species. Thus, a conservation strategy that seeks to preserve as many species as possible per unit of area in high-fragmented biomes should give priority to protecting fragments in different landscapes, rather than more fragments in the same landscape. © 2008 The Authors. 14 6 961 968 Brown Jr., K.S., Conservation of the Neotropical environments: Insects as indicators (1991) The Conservation of Insects and Their Habitats, pp. 350-404. , (ed. by. Collins N.M. Thomas J.A. pp. Academic Press, Inc., San Diego Brown Jr., K.S., Borboletas da Serra do Japi: Diversidade, habitats, recursos alimentares e variação temporal (1992) História Natural Da Serra Do Japi: Ecologia e Preservaç ão de Uma Área Florestal No Sudeste Do Brasil, pp. 142-186. , (ed. by. 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