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Título: Size-dependent response of tropical wetland fish communities to changes in vegetation cover and habitat connectivity
Autor(es): Izaias Médici Fernandes
Jerry Penha
Jansen Alfredo Sampaio Zuanon
ISSN: 0921-2973
Revista: Landscape Ecology
Resumo: The replacement of native vegetation by exotic grasses for livestock production is driving landscape homogenization, habitat fragmentation and reducing connectivity between habitat patches in floodplains ecosystems.In this context we examined how changes in native and exotic vegetation cover, connectivity and water depth affect the attributes of the small [standard length (SL) < 80 mm as adults] and large-sized fish assemblages (SL a parts per thousand yen 80 mm as adults).We assessed the effects of water depth, exotic and native vegetation cover and habitat connectivity on the abundance, species richness, body size and biomass of fish assemblages in a 25 km(2) area of the seasonal habitats of the Pantanal wetland over 5 years.We showed that fish assemblage response to meso-scale variation in water depth, vegetation cover and habitat connectivity in seasonal habitats is size-dependent. The gradient from exotic to natural vegetation cover did not affect the assemblages of small-sized fish, which were mostly regulated by water depth, habitat connectivity and the gradient from grassland to forest. However, besides being affected by water depth and habitat connectivity, large-sized fish were also affected by the gradient from exotic to natural vegetation cover.Our results indicate that transformations in the landscape and changes in the dynamics of inundation may have negative consequences for the long-term persistence of fish assemblages in the Pantanal wetlands.
ISSN: 0921-2973
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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