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Trophic niche of two co-occurring ophiuroid species in impacted coastal systems, derived from fatty acid and stable isotope analyses ArchiMer
Blanchet-aurigny, Aline; Dubois, Stanislas; Quere, Claudie; Guillou, Monique; Pernet, Fabrice.
The trophic niches of 2 common co-occurring ophiuroids, Ophiocomina nigra and Ophiothrix fragilis (Echinodermata, Ophiuroidea), in 2 contrasting coastal systems of Brittany (France) were investigated. We used a combination of fatty acid biomarkers derived from neutral lipids and stable isotopic compositions to explore the contributions of oceanic versus continental inputs to the ophiuroids' diet. We investigated 2 different systems with an inshore versus offshore comparison. We sampled potential food sources and surveyed organisms every 2 mo for 1 yr. Spatio-temporal variations in stable isotopes and fatty acid profiles of the ophiuroids were generally low compared to interspecific differences. Fatty acid markers showed that both ophiuroids relied on...
Tipo: Text Palavras-chave: Echinoderm; Feeding ecology; Ophiocomina nigra; Ophiothrix fragilis; Trophic markers; Green algae.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00270/38144/36278.pdf
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Vertical distribution of brittle star larvae in two contrasting coastal embayments: implications for larval transport ArchiMer
Guillam, Morgane; Bessin, Claire; Blanchet-aurigny, Aline; Cugier, Philippe; Nicolle, Amandine; Thiébaut, Éric; Comtet, Thierry.
The ability of marine invertebrate larvae to control their vertical position shapes their dispersal pattern. In species characterized by large variations in population density, like many echinoderm species, larval dispersal may contribute to outbreak and die-off phenomena. A proliferation of the ophiuroid Ophiocomina nigra was observed for several years in western Brittany (France), inducing drastic changes on the benthic communities. We here studied the larval vertical distribution in this species and two co-occurring ophiuroid species, Ophiothrix fragilis and Amphiura filiformis, in two contrasting hydrodynamic environments: stratified in the bay of Douarnenez and well-mixed in the bay of Brest. Larvae were collected at 3 depths during 25 h within each...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00641/75321/75846.pdf
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