Is kelp detritus a good food for suspension feeders? Effects of kelp species, age and secondary metabolites |
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Authors: | D O Duggins J E Eckman |
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Institution: | (1) Friday Harbor Laboratories, University of Washington, 620 University Road, Friday Harbor, Washington 98250, USA, US;(2) Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, Georgia 31411, USA, GE |
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Abstract: | The food quality of detrital particles derived from three species of kelps was evaluated in a laboratory feeding experiment
utilizing two species of suspension feeders, the serpulid polychaete Pseudochitonopomaoccidentalis and the mussel Mytilustrossulus. Fresh and aged kelp particles were also evaluated, and growth in all treatments was compared to growth on ad libidum phytoplankton
rations. Fresh particles from Laminariagroenlandica, aged particles from Agarumfimbriatum and Alariamarginata, and mixed phytoplankton promoted the highest growth rates in both consumers. Growth was inversely related to total polyphenolic
concentration in the fresh kelp particles. The increase in quality of both Agarumfimbriatum and Alariamarginata particles with age corresponded with a rapid loss of polyphenolic secondary metabolites and an increase in total nitrogen.
Received: 26 November 1996 / Accepted: 9 January 1997 |
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