Benthic Foraminiferal Response to Variations in Temperature, Salinity, Dissolved Oxygen and Organic Carbon, in the Guanabara Bay, Rio de Janeiro, Brazil

Anuário do Instituto de Geociências

关键词: biological indicators;    temperature;    salinity;    dissolved oxygen;   

DOI  :  

来源: DOAJ

【 摘 要 】

Recent benthic foraminiferal distribution patterns in Guanabara Bay are investigatedin relation to temperature, salinity, dissolved oxygen and organic carbon content.Patterns of foraminiferal fauna differ between the entrance of the bay and inner parts. Theprimary result of the present study is that the distribution of Cassidulina subglobosa andDiscorbis williamsoni appear to be governed by lower temperature and higher salinitiesbeing found in the entrance of the bay. According to dissolved oxygen content it wasobserved that Quinqueloculina seminulum occurs when values are higher than 2 mg/l,being intolerant to low oxygen bottom water conditions. By the other hand, Buliminellaelegantissima, Bolivina striatula and Bulimmina elongata flourishes under low oxygenwaters and in sediment where the organic matter accumulation is high, being found mainly in the central parts of the bay.

【 授权许可】

Unknown