Acta Limnologica Brasiliensia
https://actalb.org/article/doi/10.1590/S2179-975X2618
Acta Limnologica Brasiliensia
Original Article

Forest fragmentation influences the diet of cichlids Apistogramma agassizii (Steindachner, 1875) and Aequidens tetramerus (Heckel, 1840) (Actinopterygii: Cichliformes) in streams of the Western Amazon

A fragmentação florestal influencia a dieta dos ciclídeos, Apistogramma agassizii (Steindachner, 1875) e Aequidens tetramerus (Heckel, 1840) (Actinopterygii: Cichliformes) em riachos da Amazônia Ocidental

Lucena Rocha Virgilio; Cleyton Holanda de Brito; Monik da Silveira Suçuarana; Lisandro Juno Soares Vieira

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Abstract

Abstract: : Aims: To evaluate the effects of replacing riparian vegetation with pasture in the diet of Apistogramma agassizii and Aequidens tetramerus.

Methods: The study was carried out in the municipality of Senador Guiomar, Acre. We sampled three streams divided into three stretches each (100 m), bordered by forest, pasture, and both forest and pasture (edge). Quarterly collections using fishnets were performed between January and October 2008.

Results: The species A. agassizii had a diet based on the consumption of adult insects in stretches of forest, different from the pasture environment, in which the consumption of insect larvae was higher. In the diet of A. tetramerus, the most important item was insect larvae in all environments, mainly in the pasture. We found low amplitude of trophic niche for A. agassizii in the forest environment, due to the consumption of adult insects, and for A. tetramerus in the pasture, due to the consumption of insect larvae. In the pasture areas, we found no difference between the items consumed by the species, which showed a high trophic niche overlap, influenced by the consumption of Diptera larvae.

Conclusion: Thus, we show that allochthonous items, such as adult insects, are food resources indicative of riparian vegetation conservation and are important for both species, mainly A. agassizii. However, this item has been replaced by autochthonous items, such as Diptera larvae, in the A. agassizii diet and become predominant in the A. tetramerus diet as the riparian vegetation deteriorates.

Keywords

food overlap, land-use change, trophic niche, riparian vegetation

Resumo

Resumo:: Objetivos: Avaliar os efeitos da substituição da vegetação ripária por pastagem na dieta de Apistogramma agassizii e Aequidens tetramerus.

Métodos: O estudo foi realizado no município de Senador Guiomar, Acre. Foram amostrados três riachos separados em dois trechos (100 metros de extensão cada), sendo um trecho margeado por floresta, borda e outro por pastagem. Foram realizadas coletas trimestrais entre janeiro e outubro de 2008, com auxílio de puçás.

Resultados: A espécie A. agassizii em trechos de floresta teve uma dieta baseada no consumo de insetos adultos, diferente do ambiente de pastagem, no qual o consumo de larvas de insetos foi maior. Já na dieta de A. tetramerus larvas de insetos foi o item mais importante em todos os ambientes, principalmente no de pastagem. Houve baixa amplitude de nicho trófico para A. agassizii em ambiente de floresta, devido ao consumo de insetos adultos, e para A. tetramerus na pastagem, devido ao consumo de larvas de insetos. Nas áreas de pastagem, não houve diferença nos itens consumidos pelas espécies, no qual apresentaram elevada sobreposição de nicho trófico, influenciado pelo consumo de larvas de Diptera.

Conclusão: Assim, evidenciamos que os itens alóctones, como insetos adultos são recursos alimentares indicadores de conservação da vegetação ripária e importantes para ambas as espécies, principalmente A. agassizii. No entanto observou-se a substituição na dieta de A. agassizii por itens autóctones, como larvas de Diptera, e o predomínio deste item na dieta de A. tetramerus conforme ocorre a degradação da vegetação ripária.
 

Palavras-chave

sobreposição alimentar, mudança do uso do solo, nicho trófico, mata ripária

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Submitted date:
04/12/2018

Accepted date:
08/31/2020

Publication date:
11/16/2020

5fb27b460e88255f4154306a alb Articles
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