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On the timing and duration of foraging in Onchidella celtica

Published online by Cambridge University Press:  09 March 2018

R.M.L. Kent*
Affiliation:
53, Foxdown, Wadebridge, Cornwall PL27 6BD, UK
S.J. Hawkins
Affiliation:
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, UK Marine Biological Association of the United Kingdom, The Laboratory, Citadel Hill, Plymouth PL1 2PB, UK
*
Correspondence should be addressed to: R.M.L. Kent 53, Foxdown, Wadebridge, Cornwall PL27 6BD, UK email: rmike.kent@tiscali.co.uk

Abstract

Time-lapse photography was used to study the timing and duration of foraging activity of a population of the pulmonate gastropod Onchidella celtica on an exposed rocky shore in Cornwall, UK. The pulmonates spent most of their time in their home crevice, emerging onto open rock only during some ebb tides to forage for food and find a mate. Total duration and speed of foraging was highly variable and did not generally conform to a triphasic pattern. The number foraging was also highly variable and was not correlated significantly with the spring/neap tide cycle or weather (air temperature above 12°C, air pressure, solar radiation, precipitation, relative humidity and wind speed). There was a significant negative correlation between foraging and surf height. Although the pulmonates foraged during all hours of the day/night cycle, foraging activity tended to be highest during the afternoon and evening.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2018 

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