English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/122574
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 17 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Short-term harmful effects of unionised ammonia on natural populations of Moina micrura and Brachionus rubens in a deep waste treatment pond

Autor Arauzo, Mercedes ; Valladolid, María
Palabras clave Unionised ammonia
Brachionus rubens
Moina micrura
Deep waste treatment pond
Fecha de publicación jun-2003
EditorElsevier
Citación Water Research 37: 2547–2554 (2003)
ResumenPopulations of Moina micrura and Brachionus rubens in a deep waste treatment pond were exposed to the natural short-term fluctuations of unionised ammonia (90-min intervals of monitoring) that occur in the course of a day during a summer algal bloom.Under natural conditions, three replicate experiments were conducted in which water temperature, pH, dissolved oxygen, total ammonia, unionised ammonia, phytoplankton biomass and zooplankton (number of living and dead organisms, mortality rate and instant mortality) were studied.The time-course of unionised ammonia concentration was consistent with those shown by temperature, pH, phytoplankton biomass, dissolved oxygen, Moina micrura mortality and Brachionus rubens mortality.On the other hand, temperature, pH and dissolved oxygen never exceeded the tolerance ranges described for Moina and Brachionus, which led us to attribute the cause of zooplankton mortality to unionised ammonia toxicity.Mortality rates of 63%, 27% and 34% were recorded for Moina in each replicate experiment. Brachionus was less affected, with mortalities of 7.3%, 6.2% and 6.0%. These results confirm previous field observations (Water Res.34(14) (2000) 3666; Water Res.37(5) (2003) 1048) that attributed a reduction in zooplankton biomass during certain periods of summer (algal blooms) to a harmful side-effect of an excessive increase in phytoplankton biomass: high photosynthetic activity during these periods of proliferation of algae gives rise to an increased pH (X8) and, subsequently, leads to production of unionised ammonia (toxic for aquatic organisms) from its ionised fraction.
Descripción 8 páginas, 4 figuras y una tabla.
Versión del editorhttp://dx.doi.org/10.1016/S0043-1354(03)00023-X
URI http://hdl.handle.net/10261/122574
DOI10.1016/S0043-1354(03)00023-X
ISSN0043-1354
Aparece en las colecciones: (CCMA) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Short term harmful Arauzo 2003.pdf613,25 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.