Characterization of phytoplankton biodiversity in tropical shipwrecks off the coast of Pernambuco, Brazil

Acta Botanica Brasilica

Douglas Henrique Cavalcanti Dos Santos²  Maria Da Glória Gonçalves Silva-cunha¹  Marilene Felipe Santiago²  José Zanon De Oliveira Passavante¹ 

[1] ,Universidade Federal de Pernambuco Programa de Pós-graduação em Oceanografia Recife PE ,Brazil

关键词: chlorophyll a;    artificial reef;    Trichodesmium;    diving;    clorofila a;    recife artificial;    Trichodesmium;    mergulho;   

DOI  :  10.1590/S0102-33062010000400007

来源: SciELO

【 摘 要 】

The phytoplankton community was studied around two artificial reefs (shipwrecks Servemar-X and Servemar-I), located off the coast of Pernambuco, northeastern Brazil, aiming to identify and thus, better describe these environments. Water samples were collected with Nansen bottle at three depths (surface, mid-column and bottom) for chlorophyll a analysis and salinity; temperature and water transparency were also measured. To collect phytoplankton samples, a diver using SCUBA equipment carried out phytoplankton hauls with a 20 µm net around the shipwrecks, about 1.5 m from the bottom for approximatly 3 minutes. Chlorophyll a concentrations at the bottom varied between 0.61 and 5.97 mg.m-3, with an average that indicates a mesotrophic environment. Temperature and salinity registered small seasonal variation, while water transparency showed a seasonal spatial pattern positively related to Chl-a rates. As regards the phytoplankton community, diatoms were the most representative group in the samples, followed by dinoflagellates, and among the species, the cyanobacteria Trichodesmium thiebautii Gomont ex Gomont prevailed quantitatively. The ecological importance of these ecosystems was confirmed by the high diversity and evenness indexes, with the influence of coastal waters playing an essential role in phytoplankton structure and diversity.

【 授权许可】

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