Time-courses in the retention of food material in the bivalves Potamocorbula amurensis and Macoma balthica significance to the absorption of carbon and chromium

Marine Ecology Progress Series
By:  and 

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Abstract

Time courses for ingestion, retention and release via feces of microbial food was investigated using 2 bivalves with different feeding strategies, Potamocorbula amurensis and Macoma balthica. The results showed 2 pathways for the uptake of food material in these clams. The first is represented by an initial label pulse in the feces. The second pathway operates over longer time periods. Inert 51Cr-labeled beads were used to determine time frames for these pathways. The first pathway, involving extracellular digestion and intestinal uptake, is relatively inefficient in the digestion of bacterial cells by P. amurensis but more efficient in M. balthica. The second pathway, involving intracellular digestion within the digestive gland of both clams, was highly efficient in absorbing  bacterial carbon, and was responsible for most chromium uptake. Differences in the overall retention of microbial 51Cr and 14C relate not to gut-passage times but to the processing and release strategies of the food material by these 2 clams..

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Time-courses in the retention of food material in the bivalves Potamocorbula amurensis and Macoma balthica significance to the absorption of carbon and chromium
Series title Marine Ecology Progress Series
Volume 78
Year Published 1991
Language English
Publisher Inter Research
Contributing office(s) Pacific Regional Director's Office, San Francisco Bay-Delta
Description 12 p.
First page 303
Last page 314
Online Only (Y/N) N
Additional Online Files (Y/N) N