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      Population biology of Astyanax lacustris (Pisces, Characiformes) in a Neotropical reservoir and its tributaries


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          Abstract The aging process of reservoirs has been extensively investigated; however, little is known about how fish populations are adjusted after many years of impoundment. Thus, this study aimed to compare the diet, length-weight relationship, sizes classes, variation in size, and age of Astyanax lacustris Lütken, 1875 collected from lotic and lentic habitats of an aging reservoir. The study group consisted of 730 captured fishes. We found that specimens collected from lotic habitats had a wider range of size classes (1.0 to 12.0 cm), were linked to a high frequency of juveniles (48.7%), and had greater feeding activity (higher stomach fullness). In contrast, fishes collected from lentic environments exhibited high rates of capture (78.4%), increased frequency of adults (87.3%), and higher values of mean standard length. The length-weight relationship indicated that lentic fishes were heavier than fish collected from lotic areas. Moreover, we observed 37 food items in A. lacustris diet, mainly plant material, algae, Cladocera, Hymenoptera, Coleoptera, and Ephemeroptera. Differences among the diet of fishes between sites were evidenced with Permanova (p < 0.05). Astyanax lacustris can be considered a persistent species in Chavantes Reservoir after aging, encountering conditions to complete its life span and adjusting to food resources.

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          Most cited references70

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          An Experimental Test of the Effects of Predation Risk on Habitat Use in Fish

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            Shyness and boldness in humans and other animals.

            The shy-bold continuum is a fundamental axis of behavioral variation in humans and at least some other species, but its taxonomic distribution and evolutionary implications are unknown. Models of optimal risk, density- or frequency-dependent selection, and phenotypic plasticity can provide a theoretical framework for understanding shyness and boldness as a product of natural selection. We sketch this framework and review the few empirical studies of shyness and boldness in natural populations. The study of shyness and boldness adds an interesting new dimension to behavioral ecology by focusing on the nature of continuous behavioral variation that exists within the familiar categories of age, sex and size. Copyright © 1994. Published by Elsevier Ltd.
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              Community assembly, coexistence and the environmental filtering metaphor


                Author and article information

                Anais da Academia Brasileira de Ciências
                An. Acad. Bras. Ciênc.
                Academia Brasileira de Ciências (Rio de Janeiro, RJ, Brazil )
                : 93
                : 2
                : e20190565
                [4] Londrina Paraná orgnameUniversidade Estadual de Londrina orgdiv1Centro de Ciências Biológicas Brazil
                [2] Belo Horizonte Minas Gerais orgnameUniversidade Federal de Minas Gerais orgdiv1Centro de Transposição de Peixes Brazil
                [1] Londrina Paraná orgnameUniversidade Estadual de Londrina orgdiv1Centro de Ciências Biológicas Brazil
                [3] Botucatu orgnameUniversidade Estadual Paulista orgdiv1Instituto de Biociências de Botucatu Brazil
                S0001-37652021000301028 S0001-3765(21)09300201028

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                : 25 February 2020
                : 20 May 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 70, Pages: 0

                SciELO Brazil


                Characidae,upper Paraná River basin,reservoir aging,native species


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