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Biplot presentation of diet composition data: an alternative for fish stomach contents analysis
De Crespin de Billy, V.; Dolegec, S.; Chessle, D. (2000). Biplot presentation of diet composition data: an alternative for fish stomach contents analysis. J. Fish Biol. 56(4): 961-973. hdl.handle.net/10.1111/j.1095-8649.2000.tb00885.x
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112, more
Peer reviewed article  

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Keywords
    Principal component analysis; Stomach content; Salmo trutta Linnaeus, 1758 [WoRMS]; Marine
Author keywords
    Feeding habits; Diet variation; Habitat variation; Brown trout

Authors  Top 
  • De Crespin de Billy, V.
  • Dolegec, S.
  • Chessle, D.

Abstract
    A multivariate analysis derived from principal components analysis (PCA), and which allows the investigation on diet composition data, is introduced. To illustrate the method, prey composition data of stomach contents of brown trout Salmo trutta L. collected in a regulated stream were used. The diet composition, foraging strategies and related patterns of fish diet variation were analysed at a macrohabitat scale (i.e. riffles and glides) by way of biplots. These graphical presentations were consistent with PCA on proportions.

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