Phosphorus dynamics in a subtropical coastal lake in Southern Brazil

Journal of Limnology

Mauricio M. Petrucio¹  Mariana C. Hennemann¹  Aurea L. Lemes da Silva² 

[1] Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Laboratório de Ecologia de Águas Continentais, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina;Departamento de Ecologia e Zoologia, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina;

关键词: Phosphorus release;    subtropical lake;    sediment phosphorus;    macroinvertebrates;    Southern Brazil;   

DOI  :  10.4081/jlimnol.2019.1894

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown