Phosphorus dynamics in a subtropical coastal lake in Southern Brazil

Phosphorus dynamics in coastal lake

  • Aurea L. Lemes da Silva | aurealuizalemes@gmail.com Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
  • Mariana C. Hennemann Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Laboratório de Ecologia de Águas Continentais, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
  • Mauricio M. Petrucio Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Laboratório de Ecologia de Águas Continentais, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.

Abstract

Temporal and spatial variations of organic and inorganic forms of phosphorus in the sediments of a subtropical oligo-mesotrophic shallow lake were investigated in relation to water column parameters, sediment characteristics and benthic fauna. The main results found were: 1) Phosphorus (P)  concentration varied seasonally, with organic P and total P  increasing in the sediments in warmer periods; 2) Sediment spatial variation, in terms of grain size composition and organic matter content, influenced P concentrations; 3) quantities and qualities of P in the sediments were positively correlated with water parameters, especially DO and NO3, Chl-a,  water temperature, pH, and total P. Negative correlations were observed between %OP and DO in sites 1, 3 and 4, and with NO3 in sites 2, 3 and 4; 4) benthic functional feeding groups showed significant relationships with temporal variation in sediment P concentration, including gathering-collectors, shredders, filterers and filtering-collectors. The results suggest a high importance of temperature mediated control of sediment-P release, both directly, through its direct effects on primary production and decomposition rates, and indirectly through its effects on other water and sediment parameters, especially dissolved oxygen concentration.

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Published
2019-11-11
Section
Original Articles
Associate Editor
Michela Rogora, CNR-IRSA Verbania, Italy
Supporting Agencies
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq - Brazil), research grants 486177/2007-6 and 473572/2008-7
Keywords:
Phosphorus release, subtropical lake, sediment phosphorus, macroinvertebrates, Southern Brazil
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How to Cite
1.
Lemes da Silva A, Hennemann M, Petrucio M. Phosphorus dynamics in a subtropical coastal lake in Southern Brazil. jlimnol [Internet]. 11Nov.2019 [cited 11Dec.2019];. Available from: https://jlimnol.it/index.php/jlimnol/article/view/jlimnol.2019.1894