protozooplankton characterization of two contrasting sites in a tropical coastal ecosystem (guanabara bay, rj)

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ID: 174197
2007
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Abstract
Much time and resources have been invested in understanding plankton dynamics in Guanabara Bay (Brazil), but no attention has been devoted to the protozooplankton. To fulfill this lacuna, abundance and composition of protozooplankton were investigated from January to December - 2000 in fortnightly surface water samplings at two distinct water quality sites (Urca - closer to the bay entrance, more saline and cleaner waters; Ramos - inner reaches, hypereutrophic waters). The density at Urca (10³ - 10(5) cell.l-1) was one to three orders of magnitude lower than at Ramos (10(4) - 10(5) cell.l-1). A seasonal trend for nanoplankton and protozooplankton was more evident at Urca, but both sites had lower densities during the colder period. Small heterotrophic dinoflagellates (20-30 mm) were dominant in over 50% of the samples. The protozooplankton abundance and composition reflected the distinct trophic conditions states found at the bay. During the wet-warm season, non-oligotrich ciliates were representative of Ramos site with Gymnodiniaceae dinoflagellates, while tintinnids and heterotrophic dinoflagellates were predominantly found at Urca mainly during the dry-cold season. This first descriptive study towards the understanding of the intricate relationships among the microbial food web components reveals that protozooplankton can be a good indicator of water quality conditions at the bay.
Muito tem sido investido para entender a dinâmica do plâncton da Baía de Guanabara (Brasil), estuário tropical com sérios problemas ambientais, mas pouco se sabe sobre o protozooplâncton. Preenchendo esta lacuna, a composição e abundância do protozooplâncton (ciliados, flagelados heterotróficos) foram investigadas em 2000, por meio de amostragens subsuperficiais, quinzenais, em dois locais com qualidade distinta de água (Urca - entrada da baía, águas mais salinas e limpas; Ramos - região mais interna, águas hipereutróficas e menos salinas). A densidade na Urca (10³-10(5) cel.L-1) foi inferior à de Ramos (10(4)-10(5) cel.L-1), com sazonalidade para o nanoplâncton e protozooplâncton mais evidente, menores valores durante o período mais frio (abril a agosto). Pequenos dinoflagelados (20-30 mm) dominaram mais de 50% das amostras. A abundância e composição refletiram o distinto estado trófico na baía (análise fatorial de correspondência: 56%). Ciliados não oligotríqueos (Vorticellidae, Dysteriidae, Didiniidae) e Gymnodiniaceae foram representativos de Ramos na estação quente-úmida (outubro - março), enquanto tintinídeos (Codonellopsidae, Metacyclididae, Tintinnidae, Undellidae) e dinoflagelados (Oxyphysaceae, Ebriidae, Protoperidiniaceae, Noctilucaceae) representativos da Urca, principalmente na estação fria-seca (abril - setembro). Este primeiro estudo descritivo, fundamental para o entendimento das relações na teia alimentar microbiana, revelou o protozooplâncton como bom indicador das condições da qualidade da água da baía.
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gomes2007brazilianprotozooplankton Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Eli Ana Traversim Gomes;Viviane Severiano dos Santos;Denise Rivera Tenenbaum;Maria Célia Villac
Journal Journal of genetic counseling
Year 2007
DOI
10.1590/S1679-87592007000100004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592007000100004
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