Ontogenetic changes in the diet of the sandbar shark, Carcharhinus plumbeus, in lower Chesapeake Bay and Virginia (USA) coastal waters

This study describes the diet of the sandbar shark, Carcharhinus plumbeus, highlighting differences in diet within various regions of the Virginia (USA) nursery area, as well as ontogenetic changes in diet. Stomach samples were obtained in 2001 and 2002 from 232 sharks caught by gillnets or longline...

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Vydáno v:	Environmental biology of fishes Ročník 80; číslo 1; s. 51 - 67
Hlavní autoři:	Ellis, Julia K, Musick, John A
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Dordrecht Dordrecht : Springer Netherlands 01.09.2007 Springer Springer Nature B.V
Témata:	Agnatha. Pisces Animal and plant ecology Animal, plant and microbial ecology Animals Autoecology Biological and medical sciences Callinectes sapidus Carcharhinidae Carcharhinus Carcharhinus plumbeus Chesapeake Bay coastal water Coastal waters Correspondence analysis crabs Crustaceans Decapoda Diet diet study techniques ecology Elasmobranchii Feeding habits Fundamental and applied biological sciences. Psychology gillnets juveniles Marine Nursery grounds ontogeny Prey sand Sand bars Sharks Shellfish shrimp Squilla Squilla empusa stomach Vertebrata Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution Virginia United States North America Virginia America Chesapeake Bay ANW, USA, Virginia, Wachapreague ANW, USA, Virginia, Sand Shoal Inlet ANW, USA, Chesapeake Bay ANW, USA, Virginia, Great Machipongo Channel ANW, USA, Chincoteague Bay ANW, USA, Virginia ANW, USA, Virginia, Cobb Bay, Sand Shoal Inlet Ontogenetic shift Nursery (animal) Coastal zone Feeding Marine environment Carcharhinidae Feeding habits Nursery grounds Correspondence analysis Vertebrata Correspondence analysis Diet Pisces Chesapeake Bay Coastal water Chondrichthyes
ISSN:	0378-1909, 1573-5133
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Shrnutí:	This study describes the diet of the sandbar shark, Carcharhinus plumbeus, highlighting differences in diet within various regions of the Virginia (USA) nursery area, as well as ontogenetic changes in diet. Stomach samples were obtained in 2001 and 2002 from 232 sharks caught by gillnets or longlines. Historical data from the Virginia Institute of Marine Science (VIMS) Shark Ecology Program were also analyzed. Ontogenetic changes in diet were evident, with crustacean prey decreasing in frequency with increasing shark size, and elasmobranch prey importance increasing with increasing shark size. Whereas previous research in Chincoteague Bay, VA showed the blue crab, Callinectes sapidus, was the dominant crustacean in sandbar shark diet, the mantis shrimp, Squilla empusa, dominated the crustacean portion of the diet in this study. Differences in diet of sharks were observed among locations within the study area. Small juveniles (<=80 cm precaudal length) in the lower Chesapeake Bay ate more fishes, whereas Eastern Shore juveniles ate more crustaceans. Crustacean prey items varied among locations along the Eastern Shore, with more portunid crabs consumed in waters near Wachapreague and more mantis shrimp consumed near Sand Shoal Inlet. Our study showed that Carcharhinus plumbeus is a generalist predator and is thus unlikely to strongly impact the population of any particular prey species, and in turn is not likely to be strongly affected by fluctuations in abundance of a single prey species.
Bibliografie:	http://dx.doi.org/10.1007/s10641-006-9116-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2
ISSN:	0378-1909 1573-5133
DOI:	10.1007/s10641-006-9116-2