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Corpus Systématique Animale

Titre du document

Food division within two sympatric species-pairs of skates (Pisces: Rajidae)

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Springer (journals)
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Nom du fichier dans la ressource
Arthropodes_v2b_01797, Mollusques_v2b_00969, Poissons_v2b_004896
  • J. D. McEachran 1,2
  • D. F. Boesch 1
  • J. A. Musick 1
  • 1) Virginia Institute of Marine Science, Gloucester Point, Virginia, USA
  • 2) Department of Wildlife and Fisheries Sciences, Texas A&M University, 77843, College Station, Texas, USA

Food habits of two sympatric species-pairs of skates (Raja erinacea-R. ocellata and R. radiata-R. senta), which occur off the east coast of North America were investigated. Stomachs from over 1600 specimens of the 4 species were collected during winter, summer, and autumn of 1969 and the winter of 1970. Diets of R. erinacea and R. ocellata consisted largely of amphipods, decapod crustaceans and polychaetes. However, R. ocellata consumed relatively more fishes and polychaetes and less decapods than R. erinacea. These two skates ate many of the same species but in different proportions; R. ocellata tended to feed on infauna and R. erinacea tended to feed on epifauna. Food preferences of the two species may be correlated to the difference in shape of the mouth and number of tooth rows. R. radiata and R. senta both fed heavily on decapod crustaceans and euphausids, but polychaetes were relatively more important to R. radiata and mysids were relatively more important to R. senta. R. radiata had a very diversified diet and fed on both epifauna and infauna. The diet of R. senta was very restricted and consisted almost entirely of epifauna. Diets of the two species-pairs were similar, but isopods and bivalves were more important to the R. erinacea-R. ocellata pair and euphausids and mysids were more important to the R. radiata-R. senta pair. These differences may reflect differences in the benthic communities with which the species-pairs are associated. Amount of overlap in resource utilization of the pairs of skates was compared with that of some other congeneric organisms.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ecologie animale, vegetale et microbienne
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
Identifiant ISTEX

Marine Biology

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  • Arthropodes
  • Mollusques
  • Poissons
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