2016
DOI: 10.1590/1982-0224-20150185
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Environmental constraints structuring fish assemblages in riffles: evidences from a tropical stream

Abstract: Riffles are unique habitats regarding to assemblage structure. However, understanding how these assemblages respond to environmental variations in small spatial extents, as within a stream, is a challenge. We assess whether the quantitative structure and the trophic composition of fish assemblages vary predictably among stream riffles. We predict that the variation of environmental conditions will explain species abundance and trophic composition, with the latter presenting higher predictive power, since speci… Show more

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Cited by 12 publications
(10 citation statements)
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References 34 publications
(43 reference statements)
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“…The most dominant species was Knodus cf. chapadae, a species with high phenotypic plasticity (Teresa et al 2016). Like its congener, K. moenkahusii, this species seems to be tolerant of environmental degradation, with a great ability to exploit niche opportunities in degraded streams (Ceneviva-Bastos et al 2007).…”
Section: Discussionmentioning
confidence: 99%
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“…The most dominant species was Knodus cf. chapadae, a species with high phenotypic plasticity (Teresa et al 2016). Like its congener, K. moenkahusii, this species seems to be tolerant of environmental degradation, with a great ability to exploit niche opportunities in degraded streams (Ceneviva-Bastos et al 2007).…”
Section: Discussionmentioning
confidence: 99%
“…Thus, an abundance of rheophilic species is expected. Most of these species are dependent upon hard substrates, where they find suitable microhabitat and food resources (Teresa et al 2016). However, with the increased runoff of terrestrial sediments, the stream bed becomes silted and less suitable for rheophilic species.…”
Section: Discussionmentioning
confidence: 99%
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“…For example, loricariid species predominated in areas of higher altitude (FLOTA Trombetas and ESEC G-P North), while these fish were much less diverse in lowland areas. Areas of higher altitude typically have more rocky substrates and faster flowing water, with an abundance of microhabitats, a type of environment that favors some groups of loricariids (Teresa et al 2016). In the lowland areas, the higher fish diversity recorded in our study may be related to the variety of aquatic ecosystems sampled, including lakes, streams, and large rivers, in contrast with the headwaters streams, that were the only bodies of water available for sampling in the upland areas.…”
Section: Discussionmentioning
confidence: 67%
“…We used the same camera with the same parameters at all sampling points. Photographs were converted into black and white to calculate the percentage of white pixels, considered as canopy opening, in the image (Teresa et al 2016).…”
Section: Environmental Variablesmentioning
confidence: 99%