Avanços Em Métodos De Coleta De Peixes E Caracterização De Habitat De Riachos Tropicais

Alves, Carlos Bernardo Mascarenhas; Mazzoni, Rosana; Brito, Marcelo Fulgêncio Guedes

doi:10.4257/oeco.2021.2502.03

Cited by 6 publications

(5 citation statements)

References 64 publications

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“…As curvas de acumulação permitem avaliar se a riqueza contabilizada aumenta à medida que novas amostras (i.e., sub-bacias) são incluídas (i.e., novas espécies restam a amostrar). A curva de acumulação de espécies atinge um platô quando a maior parte das espécies já foi coletada e poucas novas são acrescentadas com o aumento no esforço de coleta (Gotelli & Colwell 2001, Alves et al 2021. Assim, é possível analisar quais biomas são potencialmente os mais ricos, quais deles atingiram o platô e quais ainda precisam de mais esforço de amostragem e/ou taxonômico.…”

Section: Analisando a Diversidade Alfa Beta E Gamaunclassified

Macroecologia De Peixes De Riachos Brasileiros

et al. 2021

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Studies in Macroecology deal with patterns and processes on large scale (spatial, temporal and taxonomic) and that by definition are too comprehensive to be studied with replicated, manipulative and controlled experiments as it has been traditionally performed in Ecology. Macroecological studies are still conducted with a focus on terrestrial vertebrates and plants, while marine systems and especially freshwater systems remain little explored. The objective of this study is to highlight some advances in the fields of study of aquatic macroecology (spatial patterns of alpha and beta diversity), using fish from Brazilian streams as the object of analysis. By gathering stream fish occurrence information from large scale data sets, we found high total richness in Amazonia, Cerrado and Atlantic Forest, and found on average seven species per sampling unit, with small variation related to the identity of the analyzed biomes. Yet, species composition is distinct between biomes and we found high turnover levels within them. We will guide the reader through possible causes and mechanisms of the identified patterns.

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Section: Analisando a Diversidade Alfa Beta E Gamaunclassified

Macroecologia De Peixes De Riachos Brasileiros

et al. 2021

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“…As técnicas utilizadas nesse tipo de estudo são essencialmente aquelas consideradas tradicionais, representadas pelas peneiras, picarés, redes de espera e pesca elétrica (ver detalhes em Alves et al 2021). No entanto, é importante adequar a sua técnica ao grupo Figura 8.…”

Section: Técnicas De Capturaunclassified

Variação Intraespecífica Em Peixes De Riacho Com Ênfase Na Ecologia Trófica

Manna

Rezende

2021

Oecol. Aust.

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Assessing intraspecific variability in community structure and functioning are still scarce for stream-dwelling fish. However, measuring ecological traits for individuals is important since species’ response for environmental conditions occurs at the individual level, especially in streams which suffers constantly physical disturbances. Intraspecific variability can be measured for several ecological traits, such as morphology, diet, life-history, and habitat use that varies between populations or within populations. Here, we present some methods and studies that evaluated intraspecific trophic variability in stream-dwelling fish. Results revealing the role of individual variation in structure of biological populations and/or assemblages were selected, and principal issues were discussed. There are a lot of statistical tools that can test individual variation including functional indexes and multivariate analyzes. Results generated from such individual analyzes have high potential to explain the functioning of stream fish populations and communities.

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“…Os métodos de coleta de peixes de riacho estão consolidados (Lagler 1978, Uieda & Castro 1999, Oyakawa & Esteves 2004, Hayes et al 2012, Hubert et al 2012, Reynolds & Kols 2012, Kelso et al 2012, Alves et al 2021) e incluem diversos petrechos, como redes, armadilhas e eletropesca. A robustez da amostragem é influenciada pelo (i) tamanho dos indivíduos e sua susceptibilidade de captura ao(s) petrecho(s) de pesca utilizado(s), bem como pela distribuição desses indivíduos nas perspectivas (ii) espacial e (iii) temporal.…”

Section: Amostragem E Métodos De Coletaunclassified

Idade E Crescimento De Peixes De Riacho: Métodos E Desafios Para a Obtenção De Estimativas Robustas

Vaz‐dos‐Santos

Silveira

2021

Oecol. Aust.

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Age and growth are key elements on the fish population dynamics, allowing the age structure identification, age of first maturity, mortality rates and longevity calculations, among others. There are also age-based fisheries and ecological models that depends on these studies. It is a challenger field due to the intrinsic variability of growth process at individual and population levels, influenced by endogen and exogen factors. For freshwater fishes, the modal progression analysis, and the analysis of growth rings on scales are widespread applied for age and growth. Like all methods, premises and limitations exist and they must be observed. Otolith analysis is more accurate, unless difficult to stream fishes due to sample size requirements, small otolith size and rings record, specially at the Neotropical region. In this study, sample techniques, material and data acquirement and analyses are presented, focusing stream fishes. Limitations were identified in the results available in the scientific literature due to no consideration of methods premises allied to the mechanic use of software and manuals. For further studies, length frequency analysis, otolith daily rings and experiments are recommended to estimate age and growth of fishes from brooks and streams.

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Avanços Em Métodos De Coleta De Peixes E Caracterização De Habitat De Riachos Tropicais

Cited by 6 publications

References 64 publications

Macroecologia De Peixes De Riachos Brasileiros

Macroecologia De Peixes De Riachos Brasileiros

Variação Intraespecífica Em Peixes De Riacho Com Ênfase Na Ecologia Trófica

Idade E Crescimento De Peixes De Riacho: Métodos E Desafios Para a Obtenção De Estimativas Robustas

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