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Feeding rates of continually submerged Hydrobia ulvae vary during the daylight hours

Published online by Cambridge University Press:  08 January 2004

R.S.K. Barnes
Affiliation:
Department of Zoology, University of Cambridge, Cambridge, CB2 3EJ, UK, E-mail: rsb1001@cam.ac.uk
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Abstract

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Feeding, as estimated by egestion rate, in coastal epibenthic mud snails Hydrobia ulvae living continually submerged in lagoon-like conditions varies significantly with time of day. Both in the field and in the laboratory, egestion rate is maximal around mid-day and minimal at twilight. This variation, here ranging in magnitude from mean lows of some nine faecal pellets h−1 to highs of 34 h−1, is consonant with likely rhythms of availability and productivity of their microphytobenthic food.

Type
Research Article
Copyright
2003 Marine Biological Association of the United Kingdom