Grazer biomass correlates more strongly with production than with biomass of algal turfs on a coral reef

The biomass of large herbivorous grazing fish on the shallow reef crest of Myrmidon Reef, Great Barrier Reef, is 7.0 times that on the reef slope (15 m depth), and 2.3 times that on the reef flat. Biomass of algal turfs on the crest was only 1.4 and 1.0 times that on the slope and flat, respectively...

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Bibliographic Details
Published in:Coral reefs 2003-04, Vol.22 (1), p.63-67
Main Author: RUSS, G. R
Format: Article
Language:English
Subjects:
Algae
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Biomass
Cnidaria. Ctenaria
Coral reefs
Fish
Food production
Fundamental and applied biological sciences. Psychology
Habitats
Invertebrates
Marine
Marine biology
Sea water ecosystems
Synecology
Turf
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Summary:The biomass of large herbivorous grazing fish on the shallow reef crest of Myrmidon Reef, Great Barrier Reef, is 7.0 times that on the reef slope (15 m depth), and 2.3 times that on the reef flat. Biomass of algal turfs on the crest was only 1.4 and 1.0 times that on the slope and flat, respectively. In contrast, rate of production of algal turfs on the crest was 5.3 and 2.8 times that on the slope and flat, respectively. A multiple correlation between large grazer biomass, algal turf biomass, and algal turf production across the three zones showed that only rate of algal production correlated significantly with large grazer biomass (algal production p=0.007, algal biomass p=0.418). This result suggests that large grazers may aggregate in zones of highest algal turf production. The mechanisms by which fish respond to habitat-specific differences in food production remain unclear.[PUBLICATION ABSTRACT]
ISSN:0722-4028
1432-0975
DOI:10.1007/s00338-003-0286-5