Distribuição da matéria orgânica em sedimentos superficiais de um estuário tropical hipereutrofizado (Bacia do Pina - PE, Brasil)
DOI :
https://doi.org/10.5914/tropocean.v46i2.239347Mots-clés :
carbono orgânico, carbono inorgânico, clorofila, feopigmentos, eutrofização.Résumé
Estuários recebem aportes de matéria orgânica (MO) de múltiplas fontes. Esses aportes ficam registrados no sedimento, onde a MO se distribui nas frações granulométricas. O objetivo do presente trabalho foi avaliar a distribuição da MO em sedimentos de um estuário tropical eutrofizado (Bacia do Pina - PE, Brasil). Amostras (n = 13) de sedimento foram coletadas em dezembro de 2014, processadas para separação das frações granulométricas e analisadas quanto ao percentual de carbono inorgânico, carbono orgânico (CO), carbono total (CT) e concentração de pigmentos fotossintéticos (clorofila + feopigmentos). A predominância de CO na composição do CT sedimentar refletiu maiores aportes de MO de produtores primários e fontes antrópicas relativamente à produção secundária de organismos bentônicos. A concentração de pigmentos no sedimento foi reduzida e não refletiu a eutrofização da área de estudo. Os produtos de degradação dos pigmentos predominaram no sedimento, indicando que o microfitobentos não contribuiu na composição da MO sedimentar. O CO sedimentar se concentrou nas frações granulométricas silte e argila, que contiveram em média 88% do CO sedimentar. A distribuição de CO no sedimento integral e na fração areia fina foi regulada pelo percentual de lama no sedimento, refletindo o controle hidrodinâmico sobre a deposição de partículas.
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