Eutrophication of reservoirs in Venezuela relationships between nitrogen, phosphorus and phytoplankton biomass
Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts [eutrophication] caused by anthropogenic activities in their drainage basins. We analyzed the relationships...
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| 100 | 1 | |a González, Ernesto J. |9 69397 | |
| 245 | 0 | 0 | |a Eutrophication of reservoirs in Venezuela |b relationships between nitrogen, phosphorus and phytoplankton biomass |
| 246 | 0 | 0 | |a Eutrofización de embalses en Venezuela, relaciones entre el nitrógeno, el fósforo y la biomasa de Fitoplancton |
| 520 | |a Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts [eutrophication] caused by anthropogenic activities in their drainage basins. We analyzed the relationships between nutrients and phytoplankton biomass [as chlorophyll a]. A total of 14 reservoirs from the north-central and northeastern regions of Venezuela were assessed. The reservoirs showed different degrees of eutrophication, with the most enriched located in unprotected drainage basins. The systems could be separated according to low [less than 20ug/l] and high [grather than 20ug/l] total phosphorus concentrations. Furthermore, in reservoirs with low NO 3:NH 4 ratios, Cyanobacteria were dominant, whereas other phytoplankton groups were dominant in high NO 3:NH 4 ratios. Our results showed a significant linear relationship between chlorophyll a concentrations and nutrients, phosphorus and nitrogen. This is because both nutrients can be limiting for phytoplankton growth, at least in some systems. Following these results, we suggest that the control or mitigation of eutrophication in Venezuelan reservoirs should be based on an improved management of the drainage basins, rather than simply that of the reservoirs themselves. | ||
| 653 | 0 | |a EUTROPHICATION | |
| 653 | 0 | |a NO 3:NH 4RATIO | |
| 653 | 0 | |a PHYTOPLANKTON BIOMASS | |
| 653 | 0 | |a TN:TP RATIO | |
| 653 | 0 | |a VENEZUELAN RESERVOIRS | |
| 653 | 0 | |a CYANOBACTERIA | |
| 700 | 1 | |9 42195 |a Quirós, Rolando | |
| 773 | |t Oecologia Australis |g Vol.15, no.3 (2011), p.458-475 | ||
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| 900 | |a ^tEutrophication of reservoirs in venezuela^srelationships between nitrogen, phosphorus and phytoplankton biomass | ||
| 900 | |a ^tEutrofización de embalses en venezuela^srelaciones entre el nitrógeno, el fósforo y la biomasa del fitoplancton | ||
| 900 | |a ^aGonzález^bE.J. | ||
| 900 | |a ^aQuirós^bR. | ||
| 900 | |a ^aGonzález^bE. J. | ||
| 900 | |a ^aQuirós^bR. | ||
| 900 | |a ^aGonzález, E.J.^tUniversidad Central de Venezuela, Instituto de Biología Experimental, Apartado 47106 - Los Chaguaramos, Caracas, Venezuela | ||
| 900 | |a ^aQuirós, R.^tUniversidad de Buenos Aires, Facultad de Agronomía, Buenos Aires, Argentina | ||
| 900 | |a ^tOecologia Australis^cOecol. Aus. | ||
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| 900 | |a Vol. 15, no. 3 | ||
| 900 | |a 475 | ||
| 900 | |a EUTROPHICATION | ||
| 900 | |a NO 3:NH 4RATIO | ||
| 900 | |a PHYTOPLANKTON BIOMASS | ||
| 900 | |a TN:TP RATIO | ||
| 900 | |a VENEZUELAN RESERVOIRS | ||
| 900 | |a CYANOBACTERIA | ||
| 900 | |a Venezuela has more than 110 oerating reservoirs. However, limnological information is only available for about 20 percent, despite the fact that several of them are subject to negative impacts [eutrophication] caused by anthropogenic activities in their drainage basins. We analyzed the relationships between nutrients and phytoplankton biomass [as chlorophyll a]. A total of 14 reservoirs from the north-central and northeastern regions of Venezuela were assessed. The reservoirs showed different degrees of eutrophication, with the most enriched located in unprotected drainage basins. The systems could be separated according to low [less than 20ug/l] and high [grather than 20ug/l] total phosphorus concentrations. Furthermore, in reservoirs with low NO 3:NH 4 ratios, Cyanobacteria were dominant, whereas other phytoplankton groups were dominant in high NO 3:NH 4 ratios. Our results showed a significant linear relationship between chlorophyll a concentrations and nutrients, phosphorus and nitrogen. This is because both nutrients can be limiting for phytoplankton growth, at least in some systems. Following these results, we suggest that the control or mitigation of eutrophication in Venezuelan reservoirs should be based on an improved management of the drainage basins, rather than simply that of the reservoirs themselves. | ||
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