COMPOSIÇÃO E DISTRIBUIÇÃO ESPACIAL DA MACROFAUNA BÊNTICA DA PLATAFORMA CONTINENTAL DO MARANHÃO, BRASIL

Detalhes bibliográficos
Ano de defesa: 2022
Autor(a) principal: ROCHA, Lais Rodrigues lattes
Orientador(a): JORGE, Marianna Basso lattes
Banca de defesa: JORGE, Marianna Basso lattes, CUTRIM, Andrea Christina Gomes de Azevedo lattes, DIAS, Francisco Jose da Silva lattes
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal do Maranhão
Programa de Pós-Graduação: PROGRAMA DE PÓS-GRADUAÇÃO EM OCEANOGRAFIA
Departamento: DEPARTAMENTO DE OCEANOGRAFIA E LIMNOLOGIA/CCBS
País: Brasil
Palavras-chave em Português:
Bivalvia;
Gastropoda;
Índices Ecológicos;
Massa d’água;
Parâmetros ambientais
Palavras-chave em Inglês:
Bivalvia;
Gastropoda;
Ecological indices;
Water body;
Environmental parameters
Área do conhecimento CNPq:
Sedimentologia Marinha
Link de acesso: https://tedebc.ufma.br/jspui/handle/tede/4412
Resumo: This study presents an evaluation of the composition and spatial distribution of benthic benthic macrofauna which are organisms retained in mesh sizes of 0.5 mm to 5 cm, and associated with the substrate on the Maranhão Continental Shelf. In all, 24 samples obtained 24 samples distributed in three transects during the rainy period of April 2019, aboard the ship Ciências do Mar II. The environmental characterization suggests an environment with homogeneous spatial variation as predominantly sand, high hydrodynamics, low concentration of organic matter, high temperature (>21.9 °C) high salinity (>17 g kg -1 ), well oxygenated (>6.2 mg L -1 ), and with the influence of three water bodies: river water, coastal water and tropical water. The relative abundance of benthic macrofauna was 201,288 organisms, distributed in six taxonomic taxonomic groups. Among the main groups, Gastropoda exhibited the highest abundance (59%), followed by Bivalvia (30%). The ecological indices indicate an environment with low richness (S<5) and diversity (H'<1), with heterogeneous distribution of the major groups, represented by low equitability (J'<0.5) and high dominance (Do>0.5). As for the influence of environmental parameters on benthic macrofauna it is possible to observe a higher abundance of Bivalvia associated with the parameters sand, temperature and dissolved dissolved oxygen, and of Gastropoda associated with suspended particulate matter organic matter, gravel and depth.

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