Colonization of the Corumbá Reservoir (Corumbá River, Paraná River Basin, Goiás State, Brazil) by the "lambari" Astyanax altiparanae (Tetragonopterinae; Characidae)

Dias, Rosa Maria; Bailly, Dayani; Antônio, Rosimeire Ribeiro; Suzuki, Harumi Irene; Agostinho, Ângelo Antônio

doi:10.1590/s1516-89132005000300017

Cited by 31 publications

(11 citation statements)

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“…The initial relative increase in small‐sized individuals was most pronounced at the reservoir sites. This suggests that dam closure was related to the colonization of small‐sized fish, which usually proliferate in the first year after impoundment (Dias et al , , Agostinho et al , ). Five years after dam closure, the response of fish assemblages demonstrated clear differences according to their spatial context in relation to the dam.…”

Section: Discussionmentioning

confidence: 99%

Alternative ways to measure impacts of dam closure to the structure of fish communities of a neotropical river

et al. 2015

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Neotropical freshwaters host some of the most biodiverse ecosystems in the world and are among the most threatened by habitat alterations. The high number of species and lack of basic ecological knowledge provide a major obstacle to understanding the effects of environmental change. We assessed the impact of dam closure on the fish communities of a neotropical river by applying simple descriptions of community organizations: species abundance distribution and abundance biomass comparison curves. Fish data were collected using gillnets during three distinct time periods (1 year before, 1 year after and 5 years after dam closure), at eight sites located downstream of the dam, in the reservoir, transition zone and upstream. A total of 69 343 individuals representing 260 species were recorded. Dam closure was associated with changes in the organization of fish communities at all sites. Species richness tended to increase immediately after dam closure while evenness decreased. Changes in taxonomic structure (richness and evenness) were accompanied by a change in the distribution of biomass with the proportionate contribution by smaller individuals significantly increased relative to larger individuals. Five years on, richness had fallen to below pre‐closure levels at all sites, while the comparative stability of assemblages in the transformed habitats was reflected by biomass‐abundance distribution patterns that approximated pre‐disturbance ratios. This simplistic analysis provided a sensitive and informative assessment of ecological conditions, which highlights the impact to ecosystem process and ecological networks and has particular value in regions where a lack of detailed ecological knowledge precludes the application of traditional bioassessment methods. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Alternative ways to measure impacts of dam closure to the structure of fish communities of a neotropical river

et al. 2015

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“…In this study, 55% of species showed k value greater than 0.50; among these, except H. derbyi and P. mesopotamicus, all are considered small and medium-sized species. In addition, in reservoirs, the fish assemblage is composed basically by small-sized fishes (Dias et al, 2005;Agostinho et al, 2007). Those findings intensified the pattern highlighted by Pauly (1998a) for tropical fish.…”

Section: Discussionmentioning

confidence: 99%

Estimates of population parameters and consumption/biomass ratio for fishes in reservoirs, Paraná State, Brazil

2012

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Consumption, natural mortality, and growth are important parameters for the construction for both fisheries and ecosystems models. We estimated k (growth constant of the von Bertalanffy's function), L oo 1 (asymptotic length), W oo (asymptotic weight), Ar (caudal fin index), M (natural mortality), and Q/B (consumption/biomass ratio) for several fish species inhabiting reservoirs. We explored possible relationships among these parameters for 135 fish species sampled in thirty reservoirs in the State of Paraná, southern Brazil. Maximum length (L max ) varied from 2.60 to 79.00 cm, L oo from 2.73 to 85.05 cm, W oo from 0.23 to 9,490.26 g, k from 0.01 to 2.38 yr , and Q/B from 3.31 to 67.18. Significant correlations were observed between most pairs of parameters, except for Ar and k, Ar and L oo , and for M and Q/B. The estimates presented here may be useful for constructing Ecopath models, both in Brazil and other tropical regions, where the use of ecosystem modeling is growing.O consumo, a mortalidade natural e as estimativas de crescimento são parâmetros importantes para a construção de modelos pesqueiros e ecossistêmicos. Dessa forma, neste trabalho foram calculados os parâmetros k (constante de crescimento da equação de von Bertalanffy), L oo (comprimento assintótico), W oo (peso assintótico), Ar (índice da nadadeira caudal), M (mortalidade natural) e Q/B (consumo/biomassa) para peixes em reservatórios. Além disso, foram exploradas possíveis relações entre esses parâmetros para 135 espécies de peixes amostradas em 30 reservatórios no estado do Paraná, sul do Brasil. O comprimento máximo (L max ) variou de 2,60 a 79,00 cm, L oo de 2,73 a 85,05 cm, W oo de 0,23 a 9.490,26 g, k de 0,01 a 2,38 ano -1 , Ar de 0,03 a 3,60, M de 0,16 a 2,82 ano -1 , e Q/B de 3,31 a 67,18. Correlações significativas foram observadas entre todos os pares de parâmetros, exceto para Ar e k, Ar e L oo e para M e Q/B. As estimativas aqui apresentadas podem ser úteis para a construção de modelos Ecopath, tanto em outras regiões tropicais, como no Brasil, onde os modelos ecossistêmicos estão em amplo estágio de desenvolvimento.

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“…From the Salto Caxias and Jordão reservoirs, samples were collected at three sites: one from the lacustrine zone, one from the transitional zone, and one from the upstream (fluvial zone—river channel upstream from the reservoir) zone (Figure ; Delariva et al, ; Loureiro‐Crippa & Hahn, ). From the Corumbá Reservoir, samples were collected at seven sampling sites: three from the lacustrine zone, one from the transitional zone, and three from the upstream zone (Dias, Bailly, Antônio, Suzuki, & Agostinho, ). From the São Salvador Reservoir, samples were collected at six sampling sites: two from the lacustrine zone, three from the transitional zone, and one from the upstream zone (Angulo‐Valencia, Agostinho, Suzuki, Luz‐Agostinho, & Agostinho, ).…”

Section: Methodsmentioning

confidence: 99%

Fish trophic guild responses to damming: Variations in abundance and biomass

Dias

Ortega

Strictar

et al. 2020

River Research & Apps

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Dams and associated reservoirs cause drastic changes in the composition and structure of ichthyofauna. Therefore, functional groups within a fish assemblage may respond distinctly to such human interventions in rivers. The objective of this study was to evaluate how fluctuations in fish abundance and biomass differ among trophic guilds. Fish were sampled before and after damming four reservoirs, in their inner areas (more heavily impacted areas) and upstream (less impacted areas). To evaluate possible changes, we used a before–after and control‐impact experimental design. Fish were classified into trophic guilds through diet analysis and based on information available from the literature. Six trophic guilds were identified. The effect of periods (before and after damming) and sites (more and less impacted) on abundance and biomass differed among the trophic guilds. Highly specialized trophic guilds, such as herbivores and detritivores, were negatively affected by damming. Invertivores were negatively affected in the impacted area and increased in abundance and biomass in the less impacted sites. The findings of this study show that modifications imposed by damming are reflected in the abundance and biomass of fish trophic guilds, but the degree of such impacts vary according to characteristics of the considered trophic guild.

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Colonization of the Corumbá Reservoir (Corumbá River, Paraná River Basin, Goiás State, Brazil) by the "lambari" Astyanax altiparanae (Tetragonopterinae; Characidae)

Abstract: This work aimed to determine which population features were important to the colonization process of

Cited by 31 publications

References 5 publications

Alternative ways to measure impacts of dam closure to the structure of fish communities of a neotropical river

Alternative ways to measure impacts of dam closure to the structure of fish communities of a neotropical river

Estimates of population parameters and consumption/biomass ratio for fishes in reservoirs, Paraná State, Brazil

Fish trophic guild responses to damming: Variations in abundance and biomass

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