Tidal range influence on fish assemblages in a Brazilian tropical estuary

Authors

  • Vandick da Silva Batista Professor, Universidade do Amazonas, FCA-DEPESCA, Campus Universitário, Manaus, AM, 69077-000, Brasil. Trabalho realizado como Bolsista DCR do CNPq.
    • Frederico Nunes Rêgo Bolsista de Iniciação Cientifica do CNPq.

      DOI:

      https://doi.org/10.32360/acmar.v34i1-2.11725

      Keywords:

      sampling, fish diversity, tide regime, Maranhão State, Brazil.

      Abstract

      The tidal influence on the fish assemblage of creeks in the Tibiri River estuarine zone, Maranhão State, Brazil was investigated using a 120-m barrier net. A linear model showed the best fit to the data of diversity against tidal range, but it did not predict well the diversity on days with a tidal range lower than 2.8 m, when it ranged from 0.25 to 1.1 bit with a mean about 32% lower than days with a tidal range over 2.9 m. The number of individuals and biomass was not affected by the tidal range. Different volumes of water and turbidity are the causes of differences in diversity. The most representative results in terms of species diversity may be obtained in days of tide equal or greater than 2.9 m. For comparative purposes, samples must be taken during days of similar tidal range excluding those in the range 2.8 - 2.9 m and preferably at about the same daytime.

      Published

      2017-04-10

      Issue

      Section

      Artigos originais

      How to Cite

      Tidal range influence on fish assemblages in a Brazilian tropical estuary. (2017). Arquivos De Ciências Do Mar, 34(1-2), 131-136. https://doi.org/10.32360/acmar.v34i1-2.11725