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Diet quality and muscle tissue location influence consumer-diet discrimination in captive-reared rock lobsters (Panulirus cygnus)
Waddington, K.; MacArthur, L. (2008). Diet quality and muscle tissue location influence consumer-diet discrimination in captive-reared rock lobsters (Panulirus cygnus). Mar. Biol. (Berl.) 154(3): 569-576. hdl.handle.net/10.1007/s00227-008-0950-y
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Waddington, K.
  • MacArthur, L.

Abstract
    Fundamental to the accuracy of stable isotope analysis in trophodynamic studies is the ability to predict discrimination between a consumer and its diet. Despite the widespread use of stable isotope analysis in trophic ecology, uncertainty still surrounds the factors affecting consumer-diet discrimination. Here we present evidence that diet quality and location of muscle tissue analysed affects the consumer-diet discrimination for the western rock lobster, Panulirus cygnus. Consumer-diet d15N and d13C discrimination for western rock lobster tail tissue were 1.67–2.97 and 2.92–3.60‰, respectively, with d13C discrimination differing to values reported in the literature. Differences in nitrogen and carbon discrimination were observed between tail and leg tissue of lobsters of 1.22 and 1.13‰, respectively. Diet quality was also found to affect consumer-diet discrimination, with high protein pilchard diet leading to lower d15N and higher d13C discrimination. Diet quality should be considered as a factor that has the potential to affect consumer-diet discrimination when interpreting results from stable isotope studies.

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