Short term fluctuations of zooplankton abundance during autumn circulation in two reservoirs with contrasting trophic state
Zooplankton community in the reservoirs of Maranhao and Santa Luzia (Portugal) were studied during the autumn stratification breakdown and the weeks before it. The results from water transparency, chlorophyll-a and total phosphorus concentrations, calanoid to cyclopoid copepods ratio and zooplankton...
| Autores: | , , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2009 |
| País: | España |
| Recursos: | Universitat Autònoma de Barcelona |
| Repositório: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglês |
| OAI Identifier: | oai:ddd.uab.cat:40156 |
| Acesso em linha: | https://ddd.uab.cat/record/40156 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Embassaments Estat tròfic Trencament de l'estratificació Embalses Copépodos Estado trófico Ruptura de la estratificación Reservoirs Copepods Trophic status Stratification breakdown |
| Resumo: | Zooplankton community in the reservoirs of Maranhao and Santa Luzia (Portugal) were studied during the autumn stratification breakdown and the weeks before it. The results from water transparency, chlorophyll-a and total phosphorus concentrations, calanoid to cyclopoid copepods ratio and zooplankton abundance confirm the different trophic state of both studied reservoirs: mesotrophic-eutrophic (Maranhao) and oligotrophic-mesotrophic (Santa Luzia), as previous studies have reported. Using Copidodiaptomus numidicus to compare both studied reservoirs, we found higher egg production rates in Maranhao than in Santa Luzia. Nevertheless, no relationship was ever found between zooplankton (abundance or egg production rate) and environmental variables (temperature and chlorophyll-a), which may suggest that wide and complex range of factors, abiotic as much as biotic, are involved in zooplankton dynamics during the autumn circulation period. |
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