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DISTRIBUITION OF CRUSTOSE CORALLINE ALGAE (CORALLINALES, RHODOPHYTA) IN THE ABROLHOS REEFS, BAHIA, BRAZIL

Distribuição das algas calcárias incrustantes (Corallinales, Rhodophyta) nos recifes dos Abrolhos, Bahia, Brasil

ABSTRACT

The crustose coralline algae have an important structural role in coral reef crests, as observed for some Atlantic reefs. In this work the distribution and abundance of crustose coralline algae and their relation to other benthic reef organisms were described for the Abrolhos Archipelago. The quantification of sessile organisms was made by SCUBA diving along replicated transect lines in different habitats and sites. Anovas were performed to test differences on algae abundance among sites and habitats. Coralline crusts did not show significant differences on abundance among sites (Anova, p>0,05), neither other benthic organisms (Anovas, p=0,634 invertebrates, p=0,767 filamentous algae, p=0,581 foliose algae, p=0,070 leathery algae and p=0,616 non calcareous crusts). Invertebrates and filamentous algae were the most abundant organisms on all sites and most habitats, contrasting with the low cover of coralline algae. In sheltered sites and on reef base it was observed a trend for an increase of fleshy foliose algae and leathery algae, contrasting with wave exposed sites. The distribution of coralline growth forms was characterized by a higher abundance of flat in relation to branched thalli. Branched coralline crusts are apparently more abundant within cryptic reef areas, not necessarily because of light limitation, but probably due to less herbivore pressure.

Keywords:
crustose coralline algae; distribution; reef habitats

RESUMO

As algas calcárias incrustantes possuem importante papel estrutural nas cristas recifais, como observado para alguns recifes do Atlântico. Neste trabalho, a distribuição e abundância das algas calcárias incrustantes em relação a outros organismos bênticos recifais foi descrita para o Arquipélago dos Abrolhos. A quantificação dos organismos sésseis foi por mergulho autônomo em transectos replicados em diferentes locais e habitats. Anovas foram usadas para testar diferenças na abundância das algas entre locais e habitats. Não foram observadas diferenças significativas entre locais nem na abundância de crostas calcárias (Anova, p>0,05) nem de outros organismos (Anovas, p=0,634 invertebrados, p=0,767 algas filamentosas, p=0,581 algas foliáceas, p=0,070 algas coriáceas). Invertebrados e algas filamentosas foram os organismos mais abundantes em todos os locais e maioria dos habitats, contrastando com a baixa cobertura de crostas calcárias. Nos locais abrigados e na base dos recifes, foi observada uma tendência para aumento de algas foliáceas pouco rígidas e algas coriáceas, contrastando com locais mais expostos às ondas. A distribuição dos morfótipos de crostas calcárias foi caracterizada pela alta abundância de talo plano em relação ao talo ramificado. As crostas calcárias ramificadas são aparentemente mais abundantes nas partes crípticas dos recifes, não necessariamente pela limitação da luz, mas provavelmente devido a uma menor pressão de herbivoria.

Palavras-chave:
algas calcárias incrustantes; distribuição; habitats recifais

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ACKNOWLEDGMENTS

We would like to thanks the staff of the National Marine Park of Abrolhos who supported field work, Abrolhos Turismo for helping with boat transportation and the Brazilian Navy for their hospitality. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES has given a MSc scholarship to the first author and Instituto Brasileiro do Meio Ambiente - IBAMA issued a research the license for collecting samples. We are grateful to Andrea Franco de Oliveira at LAGIEF/IEF-RJ for help with the map.

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Publication Dates

  • Publication in this collection
    Oct-Dec 2007

History

  • Received
    May 2007
  • Accepted
    Oct 2007
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