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Hydrobiologia

, Volume 353, Issue 1–3, pp 171–180 | Cite as

Intertidal zonation of benthic macrofauna in a subtropical salt marsh and nearby unvegetated flat (SE, Brazil)

  • Sérgio A. Netto
  • Paulo C. Lana
Article

Abstract

Intertidal zonation and seasonal variability of benthic macrofaunawere analysed along a Spartina alterniflora (Loisel) marshand nearby unvegetated flat in a subtropical bay. Fivereplicate samples were taken along six tidal levels from the uppermarsh, limited by mangroves, to the lower unvegetated flat.Sediment composition, live and dead above- and below-ground biomassof S. alterniflora and detritus biomass from the vegetatedand unvegetated areas were determined to evaluate whethervariations on plant structure and detritus along the 25 m transectaffect the dynamics of benthic invertebrates. Composition andabundance of invertebrates varied with the elevation and plantcover clearly plays a key role on the distribution patterns of themacrofauna. Below-ground and dead above-ground biomass presentedthe highest correlation with the densities of the invertebrates.Vertical distribution of benthic fauna, however, appears not to beaffected by bellow-ground fraction. Higher detritus biomass in theupper unvegetated flat coincided with higher densities ofdetritivorous or omnivorous species in this level. An eruptivealgal growth during summer affected positively most of the dominantspecies.

zonation macrofauna salt marsh tidal flat ParanaguáBay Brazil 

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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Sérgio A. Netto
    • 1
  • Paulo C. Lana
    • 2
  1. 1.Plymouth Marine LaboratoryUniversity of PlymouthPlymouthUnited Kingdom
  2. 2.Centro de Estudos do MarUniversidade Federal do ParanóPontal do Sul,C.P. 43Brazil

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