The present study provides a species list of marine and estuarine gastropods from Camamu Bay, in the state of Bahia, northeastern Brazil. Expeditions to collect mollusks were carried out between 2003 and 2006 in Acaraí River estuary, using a trawling boat with otter trawl. A total of 3,193 gastropod specimens were identified, belonging to 46 families, comprising 94 species. Amongst the recorded species, all represent the first occurrence to Camamu Bay and four to the state of Bahia (genera Littoridina, Morula and the species Cadlina rumia and Polystira albida).
In this study, we present descriptions, illustrations, comments, and bathymetric and geographic distributions of the brittle star species related to the estuary region of Camamu Bay, located in the State of Bahia, Brazil. The brittle star fauna lives on biological substrates, sand bottoms, mud and rubble in the Camamu Bay and comprises 12 species divided into five families. Almost all of them are common in the tropical and subtropical fauna of the regions of shallow water. Ophiophragmus filograneus is reported for the first time in Bahia, and nine other species are recorded for the first time in Camamu Bay: Amphipholis januarii, Amphipholis squamata, Ophiophragmus filograneus, Ophiostigma isocanthum, Ophioderma cinerea, Ophioderma januarii, Ophiactis lymani, Ophiactis savignyi and Ophiocoma echinata. The results suggest that the ophiuroid assemblages are strongly affected by marine currents as well as by different kinds of bottom substrate.
Camamu Bay is the second largest estuary in Bahia state, northeastern Brazil, being recognized by its high diversity and economical relevance for fisheries and tourism. To evaluate the impacts of environmental disturbances in Camamu Bay, trace metals (Cr, Mn, Fe, Co, Ni, Cu, and Pb) were quantified in two widespread and commercially exploited shrimp species (Farfantepenaeus paulensis and Xiphopenaeus kroyeri). High concentrations of all metals but Pb were observed in both species by ICPOES. The concentration values for Cr, Co, and Mn were invariably higher than the accepted limits for human consumption in Brazil. Inter and intraspecific variation in metal levels might be related to biological particularities and body size. The accentuated contamination by trace metals in both species validated them as efficient bioindicators of environmental quality. Thus, effective planning, monitoring and regulatory policies should be adopted to inspect and remediate the metal contamination in natural resources from Camamu Bay.
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