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Fish community modeling agents on an artificial reef on the northern coast of Rio de Janeiro - Brazil

Abstracts

Stationary visual census surveys were performed on an experimental artificial reef (21º29'S, 41º00'W) to clarify the role of structural complexity and benthic community as fish community modeling agents. Concrete modules of four types were grouped according to the combination of structural complexity through the presence/absence of holes and favourable/unfavourable surface for benthic colonization by anti-fouling painting. The survey (December 2002 to March 2003) showed higher abundance, richness and diversity in the complex modules. The same habitat usage pattern was observed according to vertical position and bottom type categories: demersal, hard-bottom and habitat generalist fishes preferred the complex ones. A higher number of juveniles occurred at those modules. It is assumed that trophic relationships and different habitat selection related to ontogenetic stages are also important modeling agents to the fish community structure since juvenile fish seem to actively seek the experimental complex modules.

Artificial reef; Fish community; Modeling agents; Structural complexity; Rio de Janeiro


Censos visuais estacionários foram realizados em um recife artificial (21º29'S, 41º00'W) para determinar o papel da complexidade estrutural e da comunidade bêntica como agentes modeladores da comunidade íctica. Módulos de concreto foram agrupados de acordo com a combinação do fator complexidade estrutural através da presença/ausência de cavidades internas nos módulos e de superfícies favoráveis/desfavoráveis à colonização da comunidade bêntica através de tinta anti-incrustante. De dezembro de 2002 a março de 2003, foram registrados maiores valores de abundância, riqueza e diversidade nos módulos complexos. Padrões de uso de habitat similares foram observados de acordo com a posição vertical na coluna de água e tipo de fundo: peixes demersais, de fundo consolidado e habitat generalista preferiram módulos complexos. Os resultados indicam que relações tróficas e seleção de habitat relacionada ao estágio ontogenético são também importantes agentes modeladores da comunidade íctica, uma vez que peixes juvenis buscam ativamente os módulos experimentais estruturalmente mais complexos.

Recife artificial; Comunidade íctica; Agentes modeladores; Complexidade estrutural; Rio de Janeiro


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Publication Dates

  • Publication in this collection
    05 Nov 2007
  • Date of issue
    Dec 2006

History

  • Received
    06 Apr 2006
  • Reviewed
    31 July 2006
  • Accepted
    25 Sept 2006
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