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Laboratory Studies of the Ecological Significance of Host-Algal Nutritional Associations in Solitary and Colonial Radiolaria

Published online by Cambridge University Press:  11 May 2009

O. R. Anderson
Affiliation:
Biological Oceanography, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964
N. R. Swanberg
Affiliation:
Biological Oceanography, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964
P. Bennett
Affiliation:
Biological Oceanography, Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964

Extract

Symbiont-bearing solitary and colonial radiolaria occur abundantly in diverse water masses throughout the major oceans of the world, including oligotrophic surface water (e.g. Strelkov & Reshetnyak, 1971; Casey, 1971, 1977; Anderson, 1983; Swanberg, 1979, 1983). Studies of their nutrition (Anderson, 1978, 1983; Swanberg, 1983) suggest that the algal symbionts may serve a substantial role in sustaining host nutrition. Our studies on the role of symbiotic algae in radiolaria have shown that Amphidinium-type, dinoflagellate symbionts (Anderson, 1983, p. 118) associated with the solitary species, Thalassicolla nucleata, and a colonial form Collosphaera sp. contribute photosynthetically-derived carbon to the host. The amount assimilated by T. nucleata is proportional to the primary productivity of the symbionts (Anderson, Swanberg & Bennett, 1983 b). Little is known, however, about the effects of environmental variables such as light intensity and quality on the primary productivity of the symbionts and the kinds of photosynthetic products accumulated within the host cytoplasm.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1985

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