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Title

Trophic ecology of Pelagia noctiluca: a biomarkers study

AuthorsTilves, Uxue ; Fuentes, Veronica ; Raya, Vanesa ; Pascual, María ; Sabatés, Ana
Issue Date30-May-2016
PublisherCSIC - Instituto de Ciencias del Mar (ICM)
Citation5th International Jellyfish Bloom Symposium : Abstact book: 25 (2016)
AbstractThe syphozoan Pelagia noctiluca is one of the most abundant jellyfish in the Mediterranean Sea and it is known for being predator of zooplankton, including ichthyoplankton. Its abundance seem to be increasing in the NW Mediterranean Sea in the last decades and its impact on marine ecosystem is under continuous study. The objective of the present study is to identify the trophic relationships between ephyrae and adults of P. noctiluca and the main representative zooplankton groups (mainly fish larvae) using biomarkers (stable isotopes and fatty acids) as complementary approaches of gut contents, in order to have a broader view of these interactions. Zooplankton samples were collected using a Mocnness net and P. noctiluca specimens were individually sampled from the surface using a long hand net during the expedition FISHJELLY conducted from 17 June – 4 July 2011 all along the Catalan Coast (NW Mediterraneran). Results of linear mixing models (SIAR) showed that P. noctiluca is an omnivorous jellyfish that feed on a wide wariety of prey, showing a similar isotopic signature of fish larvae and with salps as the main food source for adults medusae and small crustaceans for ephyare. Moreover, fatty acid patterns confirmed these results, also reflecting differences in their diet composition. Zooplankton composition in the field and different feeding strategies between developmental stages would explain these differences. The similarity in the isotopic signatures between jellyfish and fish larvae suggests a competition between both groups, although predation on fish larvae has been demonstrated. The results of the different approached will be discussed on this paper
Description5th International Jellyfish Bloom Symposium, 30 May to 3 June 2016, Barcelona.-- 1 page
Publisher version (URL)http://www.jellyfishbloom2016.com/
URIhttp://hdl.handle.net/10261/162332
Appears in Collections:(ICM) Comunicaciones congresos
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