Idioma:

Phytoplankton biomass is mainly controlled by hydrology and phosphorus concentrations in tropical hydroelectric reservoirs

Rangel, Luciana M. ; Silva, Lúcia H. S. ; Rosa, Priscila ; Roland, Fábio ; Huszar, Vera L. M.

Hydrobiologia, 2012-09, Vol.693 (1), p.13-28 [Periódico revisado por pares]

Dordrecht: Springer Netherlands

Texto completo disponível

Citações Citado por

Enviar para

Título:
Phytoplankton biomass is mainly controlled by hydrology and phosphorus concentrations in tropical hydroelectric reservoirs
Autor: Rangel, Luciana M. ; Silva, Lúcia H. S. ; Rosa, Priscila ; Roland, Fábio ; Huszar, Vera L. M.
Assuntos: Animal and plant ecology ; Animal, plant and microbial ecology ; Biological and medical sciences ; Biomedical and Life Sciences ; Cyanobacteria ; Earth sciences ; Earth, ocean, space ; Ecology ; Exact sciences and technology ; Freshwater & Marine Ecology ; Fundamental and applied biological sciences. Psychology ; General aspects ; Hydrology ; Hydrology. Hydrogeology ; Life Sciences ; Phytochemicals ; Plankton ; Primary Research Paper ; Rainforests ; Synecology ; Zoology
É parte de: Hydrobiologia, 2012-09, Vol.693 (1), p.13-28
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Phytoplankton is widely recognized as being regulated mainly by resources (nutrients and light) and predation by higher trophic levels. In reservoirs, these controls also can be modulated by hydrology, for example through the influence of flow pulses generated by the operation of the dam. In this study, we tested the influence of light, nutrients, and zooplankton grazing pressure, and also hydrology (as water residence time) on the phytoplankton biomass in eight tropical hydroelectric reservoirs, which differ in size, morphometry, location, trophic state, and water residence time. Our hypothesis was that, as these reservoirs are used for hydroelectric purposes, the control that would otherwise be exerted on phytoplankton biomass primarily by resource availability and grazing will also be modulated by hydrology. Low phytoplankton biomass (range of system medians = 12–299 μg C l −1 ) occurred in most systems, except for one highly eutrophic reservoir (median = 1331 μg C l −1 ). Our data showed that phosphorus was more often likely to be the limiting nutrient in these systems, as assessed through nutrient limitation indexes (nitrogen and phosphorus), based on concentrations and ratios. For most reservoirs, excluding the eutrophic system with high cyanobacteria biomass, seasonal water residence time was the variable that best explained phytoplankton variation among the several environmental variables analyzed in this study ( P < 0.0001; adjusted r 2 = 0.38). Hydrology was an important and additional factor modulating phytoplankton in these tropical reservoirs, directly removing phytoplankton populations and their potential zooplankton grazers by washout, and also affecting nutrient availability.
Editor: Dordrecht: Springer Netherlands
Idioma: Inglês

Links

View record in Pascal Francis

Voltar para lista de resultados

Anterior Resultado 2 Avançar Ir para próxima página

Realização: Logos de Redes Sociais:

Phytoplankton biomass is mainly controlled by hydrology and phosphorus concentrations in tropical hydroelectric reservoirs

Rangel, Luciana M. ; Silva, Lúcia H. S. ; Rosa, Priscila ; Roland, Fábio ; Huszar, Vera L. M.

Dordrecht: Springer Netherlands

Buscando em bases de dados remotas. Favor aguardar.