efectos del enriquecimiento con n y p sobre la comunidad del fitoplancton en microcosmos de un embalse tropical (la mariposa, venezuela)

Clicks: 315
ID: 175169
1998
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Abstract
Para evaluar el efecto del enriquecimiento con nutrientes sobre la comunidad del fitoplancton del embalse La Mariposa (Venezuela), se establecieron microcosmos "in situ" durante 6 días. Los microcosmos consistieron en bolsas de polietileno con 10 l de agua epilimnética filtrada del embalse, sometidos a diferentes combinaciones de enriquecimiento con fósforo y nitrógeno, para así simular un proceso de eutroficación. Se determinaron las concentraciones de clorofila 'a', la concentración de nitrógeno total y fósforo total y la proporción numérica de los diferentes grupos del fitoplancton. Como consecuencia del enriquecimiento de nutrientes, se produjo un aumento en la biomasa del fitoplancton, siendo las respuestas más pronunciadas en los tratamientos donde ambos nutrientes estaban presentes. Los grupos Cryptophyta, Euglenophyta y Pyrrophyta desaparecieron de los microcosmos fertilizados al finalizar el período de estudio, mientras que las Chlorophyta y las Cyanobacteria aumentaron sus proporciones relativas. Las diatomeas disminuyeron su proporción relativa a altas concentraciones de nitrógeno. Aunque la técnica del microcosmos tiene limitaciones en su significado ecológico, permite obtener una valiosa aproximación para entender lo que ocurre en las situaciones naturales.
The effect of nutrient enrichment (N and P) on the phytoplankton community of La Mariposa reservoir (Venezuela) was studied. Polyethylene bags (microcosms) were filled with 10 l of filtered epilimnetic water of the reservoir, and enriched with different nutrient proportions, simulating an eutrophication process. Chlorophyll 'a', total nitrogen, total phosphorus, and phytoplankton abundance were determined. There was an increase in phytoplankton abundance because of nutrient enrichment, specially when both nutrients were present. After the experiments, Cryptophyta, Euglenophyta, and Pyrrophyta dissappeared from the microcosms, whereas Chlorophyta and Cyanobacteria increased. Numeric proportions of diatoms decreased at higher nitrogen concentration. Although the results obtained with microcosm experiments could be limited in ecological significance, they permit an useful approach to the natural situation.
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Authors ;Ernesto J. González;Mario Ortaz
Journal science journal of university of zakho
Year 1998
DOI
DOI not found
URL
http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77441998000100002
Keywords
microcosm eutrophication

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