Publication details.

Paper

Year:2015
Author(s):M. Valls, M. Cabanellas-Reboredo, I. Uranga, A. Quetglas
Title:Feeding ecology of two squid species from the western Mediterranean
Journal:MARINE ECOLOGY PROGRESS SERIES
ISSN:0171-8630
JCR Impact Factor:2.361
Volume:531
Pages:207-219
D.O.I.:10.3354/meps11347
Web:
Abstract:
The squid Loligo vulgaris (LV) and L. forbesii (LF) are 2 cephalopod species occurring
in the Atlantic Ocean and the Mediterranean Sea. Bathymetric segregation allows the co -
existence of both species, with LV preferentially inhabiting the shallow shelf and LF living on the
shelf-break and upper slope grounds. In this paper, the feeding habits of LV and LF were studied
for the first time in the Mediterranean, by means of stomach content analysis (1452 and 900 individuals
of LV and LF, respectively). The main objective was to determine the diet of both species,
analysing temporal and ontogenetic diet changes and inferring predator−prey interactions. Fish
were by far the most important prey in both squid, followed by crustaceans and cephalopods. Prey
composition revealed the bathymetric segregation of both species in the Mediterranean. Whereas
LV preferentially consumed typical coastal species of sparids and gobiids, LF preyed on slope
inhabitants such as myctophids and euphausiids. Ontogenetic shifts of diet occurred in both squid,
but took place at contrasting sizes, suggesting that the factors triggering them might be speciesspecific.
The diet of small-sized LV individuals was more dependent on bottom-living organisms
than in large individuals, which preyed mainly on benthopelagic fish. During the main reproductive
period in spring, LV increased the consumption of highly nutritive prey such as polychaetes
(nereidids). Size-related differences in LF diet during the second half of the year indicated a
deeper distribution of large individuals, preferentially preying on mesopelagic species and being
thus involved in benthic−pelagic coupling.

Related research groups

  • Marine Ecosystems Dynamics