期刊
JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
卷 317, 期 1, 页码 1-12出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jembe.2004.11.009
关键词
epipelic diatoms; cell size selection; deposit-feeder; functional response; Hydrobia ulvae; ingestion rate
The effects of cell size of epipelic diatoms and sediment Chl a content (as an index of algal biomass) on the ingestion rate of Hydrobia ulvae adults and juveniles were investigated in experimental microcosms. Results showed that both adults and juveniles ingested small and large diatoms without exhibiting cell size selection behaviour. The functional response of H. ulvae, juveniles (< 4 mm) and adults (> 4 mm), over a wide range of sediment Chl a content, was characterized by an increase of the ingestion rate according to a power law. Ingestion rate varied from 0.75 to 10 ng Chl a ind(-1) h(-1) forjuveniles and from 1 to 52 ng Chl a ind(-1) h(-1) for adults, in the range ca. 10-100 mu g Chl a (g dry weight sediment)(-1). The ingestion rate was about three times higher for adults than for juveniles. Based on these experimental results, we further proposed a mechanistic approach, using an individual based-model, to identify simple feeding mechanisms that might be involved in H. ulvae functional response. (c) 2004 Elsevier B.V. All rights reserved.
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