Mesozooplankton characterization surrounding anthropogenic sewage inputs in the southeastern eutrophic Brazilian estuary of Guanabara Bay

Maciel, O.L.C.; Almeida, E.V.

Mesozooplankton characterization surrounding anthropogenic sewage inputs in the southeastern eutrophic Brazilian estuary of Guanabara Bay

2019

Maciel, O.L.C. | Almeida, E.V.

Zooplankton assembly was characterized during the spring tide near a submarine outfall that discharges raw sewage directly into the southeastern portion of Guanabara Bay, near the Niterói, a highly urbanized center. The rain period directly influences water surface temperature and salinity, as has been previously observed in this bay. Dissolved oxygen (DO) and biochemical oxygen demand (BOD) were within the concentrations stipulated by the Brazilian legislation. The low chlorophyll a values observed herein may be associated with a nutritional imbalance to which phytoplankton may be subjected, observed through the carotenoid/chlorophyll ratio, which probably reflects zooplankton community composition. Twenty major zooplanktonic taxonomic groups were recorded, with a predominance of holoplanktonic taxa, mainly copepods. Mean zooplankton density and composition were in agreement with other studies in the region, however, these community characteristics at each of the sampling stations appear to be related to the urbanization degrees of each Niterói neighborhood.

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