Food choice in Siganus fuscescens: influence of macrophyte nutrient content and availability

Pillans, R. D., Franklin, C. E. and Tibbetts, I. R. (2004) Food choice in Siganus fuscescens: influence of macrophyte nutrient content and availability. Journal of Fish Biology, 64 2: 297-309. doi:10.1046/j.1095-8649.2003.00261.x


Author Pillans, R. D.
Franklin, C. E.
Tibbetts, I. R.
Title Food choice in Siganus fuscescens: influence of macrophyte nutrient content and availability
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1046/j.1095-8649.2003.00261.x
Volume 64
Issue 2
Start page 297
End page 309
Total pages 13
Place of publication Oxford
Publisher Blackwell Publishing Ltd
Language eng
Subject C1
270604 Comparative Physiology
780105 Biological sciences
Abstract Using multiple-choice feeding experiments, the selection of six species of macrophytes by the herbivorous rabbitfish Siganus fuscescens was examined. The rabbitfish showed distinct food choice in the laboratory; however, selection of macrophytes by S. fuscescens was not related to their absolute nutrient content (nitrogen, carbon, energy and ash free dry mass). Nutrient assimilation estimates showed that the macrophytes which were most preferred were those that S. fuscescens assimilated best. In S. fuscescens, the macrophytes that were preferred passed through the gut significantly faster than the less preferred species. Gut transit time had a significant effect on the absolute value of a food item in terms of net nutrient gain per unit time. This study showed that food value could be inferred from the absolute nutrient content of the macrophytes. Thus both the ability to assimilate nutrients as well as the absolute nutrient content of macrophytes must be quantified when assessing food value. (C) 2004 The Fisheries society of the British Isles.
Keyword Marine & Freshwater Biology
Digestion
Food Choice
Herbivory
Macrophytes
Nutrient Assimilation
Cebidichthys-violaceus Girard
Marine Herbivorous Fish
Assimilation Efficiency
Feeding Preferences
Chemical Defenses
Sparisoma-viride
Zone
Protein
Growth
Diets
Fisheries
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 13:06:19 EST