Aspects of the Cryobiology of the Intertidal Harpacticoid Copepod Tigriopus brevicornis (O. F. Muller)

Cryobiology
R McAllen, W Block

Abstract

Cold-resistance studies of marine invertebrates have concentrated on intertidal sedentary organisms, which are often subjected to subzero air temperatures in winter. Mobile rock pool inhabitants have been rarely studied because such habitats are thought to buffer environmental variation. However, it is not uncommon for small upper-shore rock pools ( approximately 2 by 1 cm) to become completely frozen. Such supralittoral habitats are subject to extreme physicochemical fluctuations especially in salinity (0 to 300 per thousand) and temperature (-1 to +32degreesC) due to evaporation and dilution. The dominant invertebrate in such habitats is the harpacticoid copepod Tigriopus brevicornis. Aspects of the cryobiology of T. brevicornis were investigated using differential scanning calorimetry (DSC). Thermograms obtained from DSC allowed determinations of freeze-onset (supercooling point, SCP), melt-onset, and melt-peak (melting point, MP) temperatures, together with estimation of the proportion of water freezing in the samples. The effects of acclimation salinity, temperature, starvation, and reproductive state on these cryobiological parameters were investigated. Acclimation to increasing salinity depressed the SCP, with the highes...Continue Reading

References

Jun 1, 1986·Journal of the Royal Society of Health·C R Grainger

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Citations

Jun 19, 2014·Physiological and Biochemical Zoology : PBZ·A B DennisM E Hellberg
Jul 4, 2003·Science Progress·William Block
Jan 1, 2014·Conservation Physiology·Gemma T WallaceChristopher J Neufeld
Aug 19, 2006·The Journal of Experimental Biology·Julien IssartelFrédéric Hervant

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