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Predator feeding strategy and prey importance: a new graphical analysis

Predator feeding strategy and prey importance: a new graphical analysis M. J. COSTELLO* Napier Polytechnic o Edinburgh, Colinton Road, Edinburgh, U.K. f (Received 9 March 1989, Accepted 27 July 1989) Key words: diet analysis, predator; prey; feeding strategy; prey importance. Diet may be analysed by numerical, volumetric and gravimetric methods (Hynes, 1950; Windell & Bowen, 1978; Hyslop, 1980). These analyses may include the frequency of occurrence and relative quantity (abundance, volume or weight) of a prey in the diet. The merits of each analysis depend on the comparability of the prey as regards food value per item, and ease of capture and handling. The relative importance and dominance of the prey is generally left to personal judgement (Hyslop, 1980). Results of the analyses are usually given in tabular form. As a graphical representation of data is generally easier to interpret, Mohan & Sankaran (1988) developed two compound indices which could be presented graphically. However, the graphical method presented here uses more straightforward descriptors of diet, namely the frequency of occurrence and relative abundance of the prey in the diet (Fig. 1). In addition, it depicts the relative importance of the prey (dominant or rare) and the degree of homogeneity of prey selection in the predator population. Percent occurrence http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Fish Biology Wiley

Predator feeding strategy and prey importance: a new graphical analysis

Costello, M. J.
Journal of Fish Biology , Volume 36 (2) – Feb 1, 1990
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References (4)

Publisher
Wiley
Copyright
Copyright © 1990 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-1112
eISSN
1095-8649
DOI
10.1111/j.1095-8649.1990.tb05601.x
Publisher site
See Article on Publisher Site

Abstract

M. J. COSTELLO* Napier Polytechnic o Edinburgh, Colinton Road, Edinburgh, U.K. f (Received 9 March 1989, Accepted 27 July 1989) Key words: diet analysis, predator; prey; feeding strategy; prey importance. Diet may be analysed by numerical, volumetric and gravimetric methods (Hynes, 1950; Windell & Bowen, 1978; Hyslop, 1980). These analyses may include the frequency of occurrence and relative quantity (abundance, volume or weight) of a prey in the diet. The merits of each analysis depend on the comparability of the prey as regards food value per item, and ease of capture and handling. The relative importance and dominance of the prey is generally left to personal judgement (Hyslop, 1980). Results of the analyses are usually given in tabular form. As a graphical representation of data is generally easier to interpret, Mohan & Sankaran (1988) developed two compound indices which could be presented graphically. However, the graphical method presented here uses more straightforward descriptors of diet, namely the frequency of occurrence and relative abundance of the prey in the diet (Fig. 1). In addition, it depicts the relative importance of the prey (dominant or rare) and the degree of homogeneity of prey selection in the predator population. Percent occurrence

Journal

Journal of Fish Biology – Wiley

Published: Feb 1, 1990

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