Effect of temperature on Temora longicornis swimming behaviour: illustration of seasonal effects in a temperate ecosystem

Moison, Maud, Schmitt, F. G. and Souissi, S. (2012) Effect of temperature on Temora longicornis swimming behaviour: illustration of seasonal effects in a temperate ecosystem Aquatic Biology, 16 (2). pp. 149-162. DOI 10.3354/ab00438.

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Abstract

The present study investigated the effect of temperature on male and female swimming activity of the calanoid copepod Temora longicornis, sampled during winter (February) and summer (August) in the English Channel coastal ecosystem. Video recordings were conducted at 3 temperatures representative of those to which these organisms are normally exposed (13, 16 and 20 degrees C) and one extreme-event temperature (24 degrees C). Examinations of instantaneous velocity and symbolic analysis (i.e. dynamics of swimming states discretized from time series of instantaneous velocity) showed that T. longicornis changed its behaviour when confronted with environmental temperature variations. Swimming speed increased as temperature increased. In warmer water, this copepod displayed higher swimming activity, break periods were less frequent, and the frequency of jumps increased. This phenomenon was amplified when the environmental temperature was increased to 24 degrees C. These observations revealed a considerable tolerance to high temperatures and an ability to adjust to environmental temperature changes. The 'summer population' was less active in the low temperature range, but the swimming speed reached a higher value at higher temperatures than that shown by the 'winter population'. The results of the present study highlighted changes in the individual behaviour of this copepod in response to changing seasonal conditions in the form of swimming activity, and thus its ability to maintain biological processes throughout the year, even in a restrictive environment.

Document Type: Article
Keywords: Copepod; Swimming behaviour; Temperature effect; Seasonal variation; Temora longicornis; Symbolic dynamics; EASTERN ENGLISH-CHANNEL; COPEPOD EURYTEMORA-AFFINIS; SEA-BED SEDIMENTS; NORTH-SEA; VERTICAL MIGRATION; CALANOID COPEPODS; MARINE COPEPOD; ACARTIA-TONSA; PHYTOPLANKTON BIOMASS; REPRODUCTIVE STAGES
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
DOI etc.: 10.3354/ab00438
ISSN: 1864-7790
Date Deposited: 20 Sep 2012 11:07
Last Modified: 06 Sep 2016 08:32
URI: http://eprints.uni-kiel.de/id/eprint/15303

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