Assimilation of particulate and dissolved basal carbon resources by Sphaerium nitidium and Grensia praeterita in an arctic lake

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)

Cassandra Anne Medvedeff (Creator)

Institution

The University of North Carolina at Greensboro (UNCG )

Web Site: http://library.uncg.edu/

Advisor

Anne Hershey

Abstract: During the summer 2006, I tested the importance of dissolved and particulate basal carbon sources to the caddisfly, Grensia praeterita, and the fingernail clam, Sphaerium nitidium, using intact sediment cores in a 1-month incubation experiment. Carbon sources included a ¹³C labeled seston treatment, an algal-derived DO¹³C treatment, a ¹³C- methyl labeled acetate treatment, and a ¹³C- carboxyl labeled acetate treatment. Grensia and Sphaerium were both found to rely on both particulate and dissolved carbon sources. While enrichment from the ¹³C labeled seston treatment (particulate source) was the largest source for both organisms, Grensia and Sphaerium both showed reliance on microbial loop processing as seen by assimilation of the algal-derived DO¹³C treatment. Sphaerium also assimilated carbon derived from methanogenic and non-methanogenic pathways of the microbial loop, based on differential assimilation of the two ¹³C labeled acetate treatments.

Assimilation of particulate and dissolved basal carbon resources by Sphaerium nitidium and Grensia praeterita in an arctic lake
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Created on 5/1/2008
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Additional Information

Publication

Thesis

Language: English

Date: 2008

Keywords

Arctic lakes, Sphaerium nitidium, Grensia, methane derived carbon, stable isotope analysis, microbial loop processing

Subjects

Sphaeriidae (Mollusks)

Carbon $x Metabolism.

Caddisflies.

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