Document Detail

Food partitioning and diet temporal variation in two coexisting sparids, Pagellus erythrinus and Pagellus acarne.
MedLine Citation:
PMID:  21366579     Owner:  NLM     Status:  In-Data-Review    
Resource partitioning in two congeneric sparids, pandora Pagellus erythrinus and axillary seabream Pagellus acarne, was investigated using stomach content analysis integrated with data on stable isotopes (δ(15) N and δ(13) C). The study was carried out on coastal muddy bottoms in the Gulf of Castellammare (southern Tyrrhenian Sea, western Mediterranean Sea) in seasons (autumn, November 2004; winter, March 2005; spring, early June 2005), at depths between 50 and 100 m. Stomach content analysis suggested low trophic niche overlap between the two species. Pagellus erythrinus mainly preyed on strictly benthic organisms (polychaetes, brachyuran crabs and benthic crustaceans). Although it consumed benthic prey, P. acarne preferred suprabenthic prey such as peracarid crustaceans from the benthic boundary layer a few metres above the bottom. The two species showed different isotopic values, with P. erythrinus exhibiting higher δ(15) N and more enriched δ(13) C than P. acarne, in accordance with its marked benthic behaviour and high predation on carnivore polychaetes. Significant temporal variability in both diet and isotopic values caused trophic differences between the two species. The autumn and winter diet differed from the spring diet and the trophic levels of both species increased from autumn and winter to spring, in accordance with variations in food availability and changes in prey δ(15) N and δ(13) C. These temporal variations may be linked to an increase in energy requirements for reproduction, together with the differing availability of preferred prey throughout the year. Significantly, lower δ(13) C was recorded in fishes collected in winter (March), suggesting the influence of river inputs as a source of particulate organic matter in this zone after the flooding season. In conclusion, these sympatric congeneric fish species displayed clear food partitioning throughout the temporal scale analysed.
E Fanelli; F Badalamenti; G D'Anna; C Pipitone; E Riginella; E Azzurro
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of fish biology     Volume:  78     ISSN:  1095-8649     ISO Abbreviation:  J. Fish Biol.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-03     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0214055     Medline TA:  J Fish Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  869-900     Citation Subset:  IM    
Copyright Information:
© 2011 The Authors. Journal of Fish Biology © 2011 The Fisheries Society of the British Isles.
ICM-CSIC P.g Maritim de la Barceloneta, 37-49 - 08003 Barcelona, Spain CNR-IAMC Via G. da Verrazzano, 17 - 91014, Castellammare del Golfo (TP), Italy ISPRA Lab. of Milazzo Via dei Mille, 44 - 98057, Milazzo (ME), Italy.
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