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Title

Mesograzers in Posidonia oceanica meadows: an update of data on gastropod-epiphyte-seagrass interactions

AuthorsGacia, Esperança ; Costalago, D. ; Prado, Patricia ; Piorno, Diana ; Tomàs, Fiona
KeywordsPosidonia oceanica
Stable isotopes
Epiphytes
Gastropods
Grazing
Nutrients
Issue Date2009
PublisherWalter de Gruyter
CitationBotanica Marina 52 : 439-447 (2009)
AbstractInformation on dietary habits of mesograzers in Posidonia oceanica seagrass meadows is scarce and restricted to a few species. Here we provide data on the most likely food sources for eight gastropod species inferred from stable isotope data. We observed very similar isotopic signals for all species regardless of trophic guild category, indicating similar consumption behaviour with a main diet contribution from epiphytes. We also review the state of knowledge on gastropod-epiphyte-seagrass interactions, with particular emphasis on the scarcity of studies derived from Mediterranean systems. Laboratory experiments showed that under moderately nutrient-enriched conditions, two species of gastropods (Bittium reticulatum and Jujubinus striatus) were controlling epiphyte biomass at high grazer densities, with no consequences for seagrass performance. Finally, the results of a long-term in situ fertilisation experiment showed that the δ15N signal for seagrass, epiphytes and gastropods reflects experimentally induced eutrophication, thus cascading up nutrient effects throughout the food web.
Description9 páginas, 5 tablas, 7 figuras.
Publisher version (URL)http://dx.doi.org/10.1515/BOT.2009.054
URIhttp://hdl.handle.net/10261/57163
DOI10.1515/BOT.2009.054
ISSN0006-8055
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(IMEDEA) Artículos
(ICM) Artículos
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