Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/16918
Title: Diversity and community structure of rapids-dwelling fishes of the Xingu River: Implications for conservation amid large-scale hydroelectric development
Authors: Fitzgerald, Daniel B.
Sabaj Pérez, Mark H.
Sousa, Leandro M.
Gonçalves, Alany P.
Py-daniel, Lúcia Rapp
Lujan, Nathan K.
Zuanon, Jansen
Winemiller, Kirk O.
Lundberg, John G.
Keywords: Anthropogenic Effect
Biodiversity
Cichlid
Community Structure
Connectivity
Conservation Status
Design
Endemic Species
Hydroelectric Power
Hydrological Response
River Basin
Spatio-temporal Analysis
Species Diversity
Species Richness
Brasil
Xingu River
Anostomidae
Cichlidae
Loricariidae
Pisces
Issue Date: 2018
metadata.dc.publisher.journal: Biological Conservation
metadata.dc.relation.ispartof: Volume 222, Pags. 104-112
Abstract: A recent boom in hydroelectric development in the world's most diverse tropical river basins is currently threatening aquatic biodiversity on an unprecedented scale. Among the most controversial of these projects is the Belo Monte Hydroelectric Complex (BMHC) on the Xingu River, the Amazon's largest clear-water tributary. The design of the BMHC creates three distinctly altered segments: a flooded section upstream of the main dam, a middle section between the dam and the main powerhouse that will be dewatered, and a downstream section subject to flow alteration from powerhouse discharge. This region of the Xingu is notable for an extensive series of rapids known as the Volta Grande that hosts exceptional levels of endemic aquatic biodiversity; yet, patterns of temporal and spatial variation in community composition within this highly threatened habitat are not well documented. We surveyed fish assemblages within rapids in the three segments impacted by the BMHC prior to hydrologic alteration, and tested for differences in assemblage structure between segments and seasons. Fish species richness varied only slightly between segments, but there were significant differences in assemblage structure between segments and seasons. Most of the species thought to be highly dependent on rapids habitat, including several species listed as threatened in Brazil, were either restricted to or much more abundant within the upstream and middle segments. Our analysis identified the middle section of the Volta Grande as critically important for the conservation of this diverse, endemic fish fauna. Additional research is urgently needed to determine dam operations that may optimize energy production with an environmental flow regime that conserves the river's unique habitat and biodiversity. © 2018 Elsevier Ltd
URI: https://repositorio.inpa.gov.br/handle/1/16918
metadata.dc.identifier.doi: 10.1016/j.biocon.2018.04.002
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