Edge-mediated effects of forest fragments on the trophic structure of stream fish

Autor(es)

Ferreira, Cristiane de Paula ^[1] ; Casatti, Lilian ^[2] ; Zeni, Jaquelini O. ^[2] ; Ceneviva-Bastos, Monica ^[2]

Afiliação do(s) autor(es)

^[1] UFPA Univ Fed Para, BR-66075110 Belem, Para - Brazil

^[2] Univ Estadual Paulista, UNESP, Dept Bot & Zool, IBILCE, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Hydrobiologia; v. 762, n. 1, p. 15-28, DEC 2015.
• Citações Web of Science: 2

Resumo

The aquatic communities of headwater streams are highly influenced by the surrounding matrix. The edge effects of forest fragments are known to influence terrestrial communities; however, their influence on aquatic communities remains poorly understood. The aim of this study was to investigate whether and how edge effects can influence stream environmental variables and fish trophic structure. We sampled stream reaches located within forest fragments (192-2480 ha) and stream reaches located on the forest edge during wet and dry periods to describe local habitat variables and fish trophic structure. We found high dissimilarity in the trophic structure (> 60%) between stream positions and between seasons. Aquatic invertivores contributed to the majority of the observed dissimilarity. Omnivores and algivores were more abundant on edge reaches and were notably associated with high water temperature. Herbivores and terrestrial invertivores were more abundant in the interior reaches mostly during the wet season and were associated with high dissolved oxygen. The scarcity of riparian forest cover on the edge reaches not only caused physical changes but also influenced the fish trophic structure, therefore providing evidence of edge-mediated effects. (AU)

• Processo FAPESP: 04/04820-3 - Fauna e flora de fragmentos florestais remanescentes no noroeste paulista: base para estudos de conservação da biodiversidade
• Beneficiário: Orlando Necchi Junior
• Linha de fomento: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 12/20280-5 - Mudanças da paisagem em médio prazo: reflexos para a composição, estrutura trófica e diversidade funcional da ictiofauna em riachos tropicais
• Beneficiário: Jaquelini de Oliveira Zeni
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 06/01479-4 - Estrutura da ictiofauna e integridade biótica de riachos em fragmentos florestais remanescentes no noroeste paulista
• Beneficiário: Cristiane de Paula Ferreira
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/11641-1 - Efeitos do incremento da complexidade estrutural em riachos degradados: dinâmica de detritos, fluxos de energia e tramas alimentares
• Beneficiário: Mônica Ceneviva Bastos
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado