Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/5716
Título: An experimental study of Aurelia aurita feeding behaviour: inference of the potential predation impact on a temperate estuarine nursery area
Autor: Pereira, Rita
Chícharo, Alexandra
Garrido, S.
Palavras-chave: Jellyfish
Zooplankton
Ichthyoplankton
Sardina pilchardus
Feeding rates
Selectivity
Data: 2014
Editora: Elsevier
Citação: Pereira, Rita; Teodósio, Maria Alexandra; Garrido, Susana. An experimental study of Aurelia aurita feeding behaviour: Inference of the potential predation impact on a temperate estuarine nursery area, Estuarine, Coastal and Shelf Science, 146, na, 102-110, 2014.
Resumo: Temperate estuaries are nursery areas for economically important fisheries resources. The common jellyfish Aurelia aurita is a resident species in many of these areas, where it can reach high abundances. This work aimed to determine the potential for predation of A. aurita on zooplanktonic organisms and early life stages of fishes, measuring feeding rates at concentrations that mimic those occurring for zooplankton, fish eggs and larvae in an estuarine nursery area. A set of experiments was aimed at determining the feeding selectivity of jellyfish when offered a mixture of fish eggs and larvae and wild plankton. Clearance rates varied markedly with prey availability and concentrations. When given mixtures of different prey types, jellyfish preferentially elected some taxa (copepods and fish eggs). Data obtained in the laboratory experiments were used to infer the potential impact of jellyfish predation upon zooplankton and ichthyoplankton in the Guadiana estuary (Southern Iberia). Repeated sampling of zooplankton, fish eggs and medusae was undertaken during the summer season of 2011. Abundance determinations were combined with experimentally estimated clearance rates of individual medusa to infer the potential jellyfish-induced mortality on prey in the area. In June and early August jellyfishinduced mortality rates were very high, and half-life times (t1/2) were consequently short for the zooplankton and ichthyoplankton. Although the potentially overestimation of our feeding rates typical of confined laboratory experiments, the results show high ingestion and clearance rates at high temperatures, typical from summer condition, and results also suggest that either by predation on early life stages of fish, or by competition for food resources, jellyfish may have a significant impact on estuarine communities and its nursery function.
Peer review: yes
URI: http://hdl.handle.net/10400.1/5716
DOI: http://dx.doi.org/10.1016/j.ecss.2014.05.026
ISSN: 0272-7714
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0272771414001541
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)



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