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Titolo:
Isotopic turnover in aquatic predators: quantifying the exploitation of migratory prey
Autore:
MacAvoy, SE; Macko, SA; Garman, GC;
Indirizzi:
Univ Virginia, Dept Environm Sci, Charlottesville, VA 22903 USA Univ Virginia Charlottesville VA USA 22903 Charlottesville, VA 22903 USA Virginia Commonwealth Univ, Ctr Environm Studies, Richmond, VA 23284 USA Virginia Commonwealth Univ Richmond VA USA 23284 , Richmond, VA 23284 USA
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
fascicolo: 5, volume: 58, anno: 2001,
pagine: 923 - 932
SICI:
0706-652X(200105)58:5<923:ITIAPQ>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELEMENTS TRANSPORTED UPSTREAM; CATFISH ICTALURUS-FURCATUS; STABLE ISOTOPES; PACIFIC SALMON; FRESH-WATER; DELTA-C-13 EVIDENCE; SOYBEAN-MEAL; FISH-MEAL; DELTA-N-15; CARBON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: MacAvoy, SE Univ Georgia, Dept Marine Sci, Athens, GA 30601 USA Univ Georgia Athens GA USA 30601 ne Sci, Athens, GA 30601 USA
Citazione:
S.E. MacAvoy et al., "Isotopic turnover in aquatic predators: quantifying the exploitation of migratory prey", CAN J FISH, 58(5), 2001, pp. 923-932

Abstract

In the tidal freshwaters of Virginia, U.S.A., the blue catfish (Ictalurus furcatus), an introduced piscivore, derives a significant proportion of itsnutrition from spawning anadromous fish (genus Alosa, including blueback herring (A. aestivalis), American shad (A. sapidissima), and alewife (A. pseudoharengus)). Because the Alosa are not continually available to I. furcatus, there is an isotopic turnover, defined as change in isotope compositiondue to growth and metabolic tissue replacement, in I. furcatus tissues associated with the diet switch from freshwater to anadromous fishes. However,isotopic turnover rates for ictalurid fish are unknown. This study determined the maximum isotopic turnover rate of channel catfish (Ictalurus punctatus) tissues and compared this maximum rate with that of I. furcatus captured in the field over the 3-month Alosa spawning run. Maximum turnover ratesfor delta C-13 were 0.014 and 0.017 parts per thousand per day in muscle and blood. For delta S-34, rates were 0.017 and 0.020 parts per thousand perday in muscle and blood, respectively. Isotopic turnover of muscle carbon reflected growth rate, but sulfur did not match growth as well. Ictalurus furcatus captured in the field showed no enrichment during the Alosa spawning run owing to slow turnover and variable diet. In aquatic ecosystems that have migrating prey, exploitation by predators may be underestimated using isotopes because of slow tissue turnover.

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Documento generato il 27/09/20 alle ore 12:46:18