VARIAÇÃO INTRAESPECÍFICA EM PEIXES DE RIACHO COM ÊNFASE NA ECOLOGIA TRÓFICA

Authors

DOI:

https://doi.org/10.4257/oeco.2021.2502.06

Keywords:

ecological traits, feeding ecology, within-population variance, within-species variability.

Abstract

Estudos que avaliam a importância da variação intraespecífica na estrutura e funcionamento de comunidades de peixes de riachos ainda são escassos. Entretanto, mensurar as características ecológicas no nível individual é de extrema importância, pois a resposta das espécies frente às variações ambientais ocorre no nível do indivíduo. Em riachos, onde as variações ambientais são constantes, essa abordagem torna-se ainda mais necessária. A variação intraespecífica em peixes de riachos pode ser mensurada a partir de diferentes características ecológicas, por exemplo, morfologia, dieta, história de vida e uso do habitat, sendo que essas características podem variar entre populações ou entre indivíduos da mesma população. O principal objetivo desse artigo foi apresentar metodologias e estudos que abordaram a variação intraespecífica na ecologia trófica de peixes de riachos. Os estudos que relacionam o papel da variação intraespecífica com a estrutura de populações e/ou comunidades foram selecionados, e suas principais implicações ecológicas, discutidas. As ferramentas de análise utilizadas para mensurar essa escala de variação são muitas, entre elas, os índices funcionais (e.g. especialização e originalidade intraespecífica), além de análises multivariadas. Os resultados gerados a partir dessas análises individuais são promissores e possuem grande potencial para explicar o funcionamento das populações e comunidades de peixes de riacho.

INTRASPECIFIC VARIATION IN STREAM FISH WITH EMPHASIS ON TROPHIC ECOLOGY: 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.

Author Biographies

Luisa Resende Manna, Universidade do Estado do Rio de Janeiro

Programa de Pós-Graduação em Ecologia e Evolução, Departamento de Ecologia, Universidade do Estado do Rio de Janeiro. Rua São Francisco Xavier 524, Maracanã, RJ, Brasil.

Carla Ferreira Rezende, Universidade Federal do Ceará

Laboratório de Ecossistemas Aquáticos, Departamento de Biologia, Centro de Ciências, Universidade Federal do Ceará, Rua Campus do Pici, Fortaleza, CE, Brasil.

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Published

2021-06-16