Trophic ecology of three echinoderms in deep waters of the Weddell Sea (Antarctica)
Rossi, Sergio (Rossi Heras) (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Elias Piera, Francyne (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)

Data:	2018
Resum:	In the Southern Ocean, the trophic ecology of deep-sea communities is probably one of the most neglected fields in the discipline. In the present study, the trophic position and energy storage-mobilization of 3 different deep-sea echinoderms living in the Weddell Sea (around 1500 m depth) were investigated with indirect tools (i. e. stable isotopes, carbohydrate-lipid-protein balance, and free fatty acid [FFA] contents). The stalked crinoid Dumetocrinus antarcticus, the holothurian Rhipidothuria racovitzai, and the ophiuroid Ophiura carinifera were sampled in spring 2003 during a Polarstern cruise. We found that stable isotopes were in line with previous results of other species (δ¹³C ranging from -24. 3‰ to -26. 5‰; δ¹⁵N ranging from 6. 8‰ to 7. 9‰), showing similarities in the trophic position of the 3 echinoderms. The capability to store energy by these 3 organisms is conspicuous and different, e. g. from 18 to 45% of the organic matter (OM) consists of lipids. The capability to mobilize energy in the form of carbohydrates and FFAs among species was also very different (e. g. biomolecules ranging from 9 to 22 µg carbohydrates mgOM⁻¹ and from 4 to 39 µg FFA mgOM⁻¹). It is suggested that even if the trophic level is similar in the 3 echinoderms, the strategies to invest the energy inputs in these deep-sea organisms in polar environments may be quite different.
Ajuts:	Ministerio de Economía y Competitividad MDM-2015-0552 Ministerio de Economía y Competitividad REN2000-3096-E/ANT European Commission 327845 European Commission 665919 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1356
Nota:	Unidad de excelencia María de Maeztu MdM-2015-0552
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Suspension feeders ; Deposit feeders ; Fatty acids ; Stable isotopes ; Energy storage ; Antarctica ; Biomarkers ; Deep sea
Publicat a:	Marine Ecology Progress Series, Vol. 596, (May 2018) , p. 143-153, ISSN 0171-8630

DOI: 10.3354/meps12544

Post-print 19 p, 995.9 KB

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