Differences in the trophic niche along the gladius of the squids Illex argentinus and Doryteuthis gahi based on their isotopic values
6 pages, 4 figures, 2 tables The squids Doryteuthis gahi and Illex argentinus coexist in the Patagonian shelf and other oceanic waters of the South Atlantic Ocean. Both species perform movements to and from shallow waters related to their ontogenetic growth. To examine changes in the trophic habitat...
Published in: | Regional Studies in Marine Science |
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Main Authors: | , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier
2017
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Subjects: | |
Online Access: | http://hdl.handle.net/10261/154303 https://doi.org/10.1016/j.rsma.2017.02.003 https://doi.org/10.13039/501100000780 https://doi.org/10.13039/501100011011 |
Summary: | 6 pages, 4 figures, 2 tables The squids Doryteuthis gahi and Illex argentinus coexist in the Patagonian shelf and other oceanic waters of the South Atlantic Ocean. Both species perform movements to and from shallow waters related to their ontogenetic growth. To examine changes in the trophic habitats in both species and across the ontogeny, we analyzed the stable isotopic values of δC and δN in their gladii. Based on sections of the gladii, we compared the trophic niche in three stages (adult [the newest section], juvenile [middle section], and a near-birth section [near the conus]). δC and δN values differed significantly between the two species and between gladius segments, revealing interspecific and ontogenetic differences in the trophic niche width. In particular, differences between segments of the gladius concurred with the ontogenetic and spawning migrations of these squids, in the Patagonian Shelf JN was supported by the Andalucía Talent Hub Program (European Union)’s Seventh Framework Program, Marie Skłodowska-Curie actions and Andalusian Knowledge Agency, Spain. RRL thanks to CONACyT for the postdoctoral support Peer Reviewed |
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