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dc.contributor.authorFanelli, Emanuela-
dc.contributor.authorCartes, Joan Enric-
dc.date.accessioned2010-07-21T09:10:34Z-
dc.date.available2010-07-21T09:10:34Z-
dc.date.issued2008-02-26-
dc.identifier.citationMarine Ecology Progress Series 355: 219-233 (2008)en_US
dc.identifier.issn0171-8630-
dc.identifier.urihttp://hdl.handle.net/10261/26427-
dc.description34 pages, 8 figuresen_US
dc.description.abstractThe feeding habits of the 2 Plesionika species occurring around the Balearic Islands (western Mediterranean) were examined. Samples were taken with a bottom trawl from depths between 247 and 752 m from August 2003 to June 2004 at 2 sites (Cabrera and Sóller) off the island of Mallorca. Both species preferentially exploited mesopelagic resources but the shallower living P. heterocarpus, which inhabits the shelf-slope break, also consumed benthic organisms (e.g. polychaetes, bivalves, tanaids). Spatio-temporal changes were evident in the diet of the 2 pandalids. In P. heterocarpus, 2 seasonal groups were revealed by nMDS analysis, one summer–autumn, the other winter–spring. Differences in prey consumption were observed between Cabrera and Sóller samples, with a temporal shift in the dominance of some prey between the 2 areas. The diet of P. heterocarpus was significantly correlated with geographical (e.g. latitude, depth), chemico-physical variables (mainly those related to sediment characteristics) and biological features (e.g. maturity stages, sex) of the species. Correlation between percentage of mature females and caloric content of prey in the stomach did not show any clear seasonal pattern; also trophic level did not change throughout the year (δ15N = 7.87‰ ± 0.17). Temporal changes in diet composition were stronger in the deeper pandalid P. martia and strictly related to its reproductive pattern. Three groups were revealed by multivariate analysis: (1) a summer group (August and September samples), (2) an autumn–winter group (November and February), characterized by high predation on gelatinous plankton, salps, hyperiids and pelagic molluscs and (3) a spring group, in which predation was directed to higher energy prey such as euphausiids and decapods. The higher percentage of mature females observed in spring was correlated with the increase in energy requirements in the pre-spawning period. Stable isotope analysis revealed a stronger seasonality for P. martia than for P. heterocarpus. An abrupt decrease in trophic level (δ15N) and an analogous enrichment in δ13C values were observed in February. This trend may be related to various factors, among others a higher consumption of refractory material (e.g. marine snow) in winter, when mesopelagic resources are scarcer, changes in the whole zooplanktonic and suprabenthic communities due to phytodetritus input of low δ15N /high δ13C values, and possible reproductive migration to deeper watersen_US
dc.format.extent5867 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.rightsopenAccessen_US
dc.subjectPandalid shrimpsen_US
dc.subjectDieten_US
dc.subjectReproductionen_US
dc.subjectSeasonalityen_US
dc.subjectEnvironmental variablesen_US
dc.subjectBenthopelagic faunaen_US
dc.subjectStable isotope analysisen_US
dc.titleSpatio-temporal changes in gut contents and stable isotopes in two deep Mediterranean pandalids: influence on the reproductive cycleen_US
dc.typeartículoen_US
dc.identifier.doi10.3354/meps07260-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.3354/meps07260en_US
dc.identifier.e-issn1616-1599-
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