Stimulation of Bacterial Activity by a Deposit Feeder in Two New Zealand Intertidal Inlets
Abstract:The impact of deposit feeding by the mudsnail Amphibola crenata on heterotrophic bacterial processes was investigated in two New Zealand intertidal inlets. Possible positive feedback to bacterial production was studied by comparing bacterial activity in sediment with that in feces of Amphibola. Heterotrophic uptake of 14C-glucose was higher in feces than in sediment and autoradiography with 3H-glucose revealed a higher proportion of metabolically active bacterial cells in feces. Amphibola assimilated ingested bacteria with an efficiency of 56% (SD = 38%). The processing of sediment into feces appears to stimulate bacterial activity and probably results in a pulse of bacterial production either in the Amphibola gut or within 3 h after egestion.
Document Type: Research Article
Publication date: July 1, 1981
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