Document Detail

Nutritional role of two algal symbionts in the temperate sea anemone Anthopleura elegantissima brandt.
MedLine Citation:
PMID:  18723639     Owner:  NLM     Status:  MEDLINE    
The intertidal sea anemone Anthopleura elegantissima in the Pacific Northwest may host a single type of algal symbiont or two different algal symbionts simultaneously: zooxanthellae (Symbiodinium muscatinei) and zoochlorellae (green algae; Trebouxiophyceae, Chlorophyta). A seasonal comparison of zooxanthellate and zoochlorellate anemones showed stable symbiont population densities in summer and winter, with densities of zoochlorellae about 4 times those of zooxanthellae. Photosynthesis-irradiance curves of freshly isolated symbionts show that the productivity (P(max) cell) of freshly isolated zooxanthellae was about 2.5 times that of zoochlorellae during July; comparable rates were obtained in other months. Models of algal carbon flux show that zoochlorellae may supply the host with more photosynthetic carbon per unit anemone biomass than zooxanthellae supply. Zooxanthellate anemone tissue was 2 per thousand ((13)C) and 5 per thousand ((15)N) enriched and zoochlorellate anemone tissue was 6 per thousand ((13)C) and 8 per thousand ((15)N) enriched over their respective symbionts, suggesting that zoochlorellate anemones receive less nutrition from their symbionts than do zooxanthellate individuals. The disparity between predicted contributions from the algal carbon budgets and the stable isotopic composition suggests that short-term measures of algal contributions may not reflect actual nutritional inputs to the host. Isotopic data support the hypothesis of substantial reliance on external food sources. This additional nutrition may allow both algae to persist in this temperate intertidal anemone in spite of differences in seasonal photosynthetic carbon contributions.
Heather Bergschneider; Gisèle Muller-Parker
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Biological bulletin     Volume:  215     ISSN:  0006-3185     ISO Abbreviation:  Biol. Bull.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-25     Completed Date:  2008-10-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984727R     Medline TA:  Biol Bull     Country:  United States    
Other Details:
Languages:  eng     Pagination:  73-88     Citation Subset:  IM    
Shannon Point Marine Center and Department of Biology, Western Washington University, Bellingham, Washington 98225-9160, USA.
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MeSH Terms
Algae, Green / metabolism*
Carbon / metabolism
Carbon Isotopes / metabolism
Heterotrophic Processes
Nitrogen Isotopes / metabolism
Pigments, Biological / metabolism
Sea Anemones / microbiology*
Reg. No./Substance:
0/Carbon Isotopes; 0/Nitrogen Isotopes; 0/Pigments, Biological; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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