Differences in the trophic niche along the gladius of the squids Illex argentinus and Doryteuthis gahi based on their isotopic values

Rigoberto Rosas-Luis*, Joan Navarro, Francisco Martínez-Baena, Pilar Sánchez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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 δ13C and δ15N 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]). δ13C and δ15N 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.

Original languageEnglish
Pages (from-to)17-22
Number of pages6
JournalRegional Studies in Marine Science
Volume11
DOIs
Publication statusPublished - 1 Mar 2017
Externally publishedYes

Keywords

  • squids
  • stable isotopes
  • niche width
  • South Atlantic Ocean
  • tophic ecology

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