Influence of interspecific interactions on avoidance response to contamination

Autor(es)

Silva, Daniel C. V. R. ^{[1, 2]} ; Araujo, Cristiano V. M. ^[3] ; Marassi, Rodrigo J. ^{[1, 4]} ; Cardoso-Silva, Sheila ^[5] ; Neto, Morun B. ^[6] ; Silva, Gilmar C. ^[4] ; Ribeiro, Rui ^[7] ; Silva, Flavio T. ^[1] ; Paiva, Teresa C. B. ^[1] ; Pompeo, Marcelo L. M. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biotechnol, Engn Sch Lorena, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Dept Ecol, Sao Paulo - Brazil

^[3] Inst Marine Sci Andalusia CSIC, Dept Ecol & Coastal Management, Campus Rio S Pedro, Cadiz 11510 - Spain

^[4] UFF, Sch Met & Ind Engn, Dept Exact Sci, Rio De Janeiro - Brazil

^[5] Sao Paulo State Univ UNESP, Environm Sci Program, Sorocaba Campus, Ave Tres Marco 511, BR-18087180 Sorocaba, SP - Brazil

^[6] Univ Sao Paulo, Engn Sch Lorena, Dept Basic & Environm Sci, Sao Paulo - Brazil

^[7] Univ Coimbra, Dept Life Sci, CFE, P-3000456 Coimbra - Portugal

• Tipo de documento: Artigo Científico
• Fonte: Science of The Total Environment; v. 642, p. 824-831, NOV 15 2018.
• Citações Web of Science: 3

Resumo

An increasing number of studies have shown the ability of organisms to escape from toxic effects due to contamination. by moving spatially towards less contaminated habitats. However, this issue has been investigated in monospecific scenarios, without considering possible interactions between species during the contamination avoidance process. It is widely known that the spatial distribution of one species can be affected by another one, in different ways. Therefore, the main question addressed in the present study was as follows: Might interspecific interaction between the freshwater fish Danio rerio (zebrafish) and Poecilia reticulata (guppy) change their behavior patterns in terms of avoidance in the presence of a copper gradient? Zebrafish and guppies exposed to a copper gradient were tested for avoidance responses in a free-choice, non-forced, static, multicompartmented exposure system, using two distinct approaches: (1) monospecific tests, in which only one species was exposed to the copper gradient, at two different population densities; and (2) multispecific tests, in which both species were tested simultaneously. In the control (with no copper) monospecific tests, both species were randomly distributed; however, in the control multispecific test, P. resiculaia tended to aggregate. In the monospecific tests with a copper gradient, both species avoided copper in a similar way, with AC(50) (concentration triggering avoidance in 50% of the exposed population) values between 15 and 18 mu g.L-1, irrespective of the population density. However, in the multispecific tests, P. reticulate displaced D. rerio to previously avoided copper levels, consequently increasing the AC(50) of D. rerio to 75 mu g. L-1. This study shows the importance of understanding the interactions among species in contaminated areas, and the way that one species can prevent the avoidance behavior of another. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 14/22581-8 - A Diretiva Quadro da Água da Comunidade Européia: aplicações à realidade dos reservatórios brasileiros
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular