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Universidad de Valparaíso
2010
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=47915589003 |
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Inhaltsangabe:
- Functional response of Sagitta setosa (Chaetognatha) and Mnemiopsis leidyi (Ctenophora) under variable food concentration in the Gullmar fjord, Sweden Odette Vergara-Soto Danilo Calliari Peter Tiselius Rubén Escribano M. Lorena González Samuel Soto-Mendoza Ciencias de la Tierra copepod ctenophore chaetognath ingestion rate Functional response Gelatinous carnivores are important components of the pelagic system and potentially key organisms in trophic webs, since they prey on several groups of organisms. In the Gullmar fjord many species of gelatinous organisms have been found exerting an important predatory impact on Acartia clausi, a dominant copepod of the mesozooplankton in this ecosystem. This work aims at evaluating the predatory impact of M. leydi and S. setosa on the community of copepods of the Gullmar fjord. These experiments were of functional-response type. In addition, length-weight regressions for predator biomass estimates were obtained. S. setosa showed a functional response Type II. By contrast, M. leidyi showed a linear functional response (Type I) with maximum ingestion (Imax) rates of 7 copepods ind-1 h-1 for individuals of length size between 7 and 15 mm. Sagitta setosa exhibited an Imax of 3.96 (copepods pred-1 h-1) with individuals in the size-range between 6 and 7 mm. The predatory impact of S. setosa and M. leidyi was high, suggesting that these species exert a strong impact on the mesozooplankton community of the Gullmar fjord. 2010 artículo científico 0717-3326 https://www.redalyc.org/articulo.oa?id=47915589003 http://www.redalyc.org/revista.oa?id=479 Revista de Biología Marina y Oceanografía application/pdf Universidad de Valparaíso Revista de Biología Marina y Oceanografía (Chile) Num.1 Vol.45