Seasonal variation in the cold-hardiness of a free-living predatory antarctic nematode, Coomansus gerlachei (mononchidae)
Pickup, Jonathan. 1990 Seasonal variation in the cold-hardiness of a free-living predatory antarctic nematode, Coomansus gerlachei (mononchidae). Polar Biology, 10 (4). 307-315. 10.1007/BF00238430
Full text not available from this repository. (Request a copy)Abstract/Summary
Coomansus gerlachei shows a strong seasonal variation in its supercooling ability, with most individuals freezing between -5° and -7°C, in a discrete high group, or between -15° and -26°C in a more diffuse low group. Increased cold-hardiness in winter is achieved by a strategy of freeze avoidance with an increase in the proportion of the population showing extensive supercooling ability. Smaller life-stages also exhibit lower supercooling points. Ice-nucleation at high sub-zero temperatures increases the probability of surviving freezing, a capacity which is enhanced in larger life-stages; adults and J4 stage juveniles show 50% survival at a supercooling point of -8.65° C. Laboratory incubations of field-fresh worms suggest that recent feeding is responsible for the movement between low and high groups. The cold-hardiness data for C. gerlachei provide interesting comparisons to the available data for microarthropods and create a precedent for seasonal changes between strategies of freezing tolerance and freezing intolerance in a field invertebrate population.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1007/BF00238430 |
ISSN: | 0722-4060 |
Additional Keywords: | seasonal variation, freezing tolerance, stage juvenile, high group, laboratory incubation |
Date made live: | 15 Aug 2018 13:14 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/520737 |
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