Variabilidade Temporal do Zooplâncton no Sistema Estuarino do Rio Paracauari (Ilha do Marajó, Pará)
DOI:
https://doi.org/10.5914/tropocean.v46i1.237250Palabras clave:
meroplâncton, copépodos, variação sazonal, Baía do Marajó, salinidade.Resumen
Coletas nictemerais foram realizadas em uma estação fixa no estuário do rio Paracauari (Pará) para determinar a composição e a densidade do mesozooplâncton (abertura de malha da rede de plâncton de 200 µm) e verificar a influência de alguns fatores ambientais sobre a comunidade zooplanctônica, nos períodos chuvoso e seco. Os valores de temperatura da água (28,5-29,4ºC), salinidade (0,42-3,14), oxigênio dissolvido (4,82-7,8 mg.L-1) e pH (7,02-7,29) foram mais elevados no período chuvoso. As concentrações de clorofila-a variaram entre 1,59-18,08 mg.m-3. Foram identificados 40 táxons, sendo 17 copépodos e 23 pertencentes a outros táxons. A densidade de copépodos oscilou entre 10,32-243,02 ind.m-3, enquanto que para os outros grupos estes valores variaram entre 2,51-1.039,19 ind.m-3. Pseudodiaptomus richardi, náuplius de Cirripedia, Tisbe sp., larvas de Gastropoda, outros Calanoida e Pseudodiaptomus gracilis foram os organismos mais representativos em termos de abundância relativa. Os resultados demonstraram que a composição e densidade do mesozooplâncton foram influenciadas pela variação sazonal dos fatores físicos e químicos da água em decorrência, principalmente, da variação na precipitação pluviométrica. Observou-se também uma maior dominância de indivíduos meroplanctônicos nas amostradas coletadas (como larvas de Cirripedia e Gastropoda), o que pode indicar processos reprodutivos de cracas e gastrópodes no estuário do rio Paracauari.Citas
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