Respiratory responses to chilling and freezing in two sub-Antarctic insects

Block, William; Worland, M. Roger; Bale, Jeffrey. 1998 Respiratory responses to chilling and freezing in two sub-Antarctic insects. Cryobiology, 37 (2). 163-166.

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The effects of chilling (to temperatures above the supercooling point, SCP) and freezing on respiration of adults and larvae of two coleopterans living on sub-Antarctic South Georgia (54°S, 37°W),Hydromedion sparsutumandPerimylops antarcticus(Coleoptera, Perimylopidae), were quantified. Respiration rates of individual insects (live weights, 11–21 mg) were measured at 10°C prior to chilling (−4°C) or freezing (SCP range −3.8 to −5.3°C) and posttreatment. The species possess a small amount of freeze tolerance in both adults and larvae. Chilling had no significant effects on respiration rates ofP. antarcticusandH. sparsutum,although mean levels were depressed by 6–15%. Freezing produced considerable enhancement of respiratory activity. Mean values increased postfreezing in larvae (+34%) ofH. sparsutumand in both larvae (+44%) (P< 0.01) and adults (77%) (P< 0.05) ofP. antarcticus.Chilling and freezing had different effects on respiration rates andP. antarcticusshowed the greatest metabolic response to freezing.

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: BAS Programmes > Pre 2000 programme
ISSN: 00112240
Additional Keywords: respiration, chilling, freezing, Coleoptera, sub-Antarctic
Date made live: 19 Nov 2013 12:04 +0 (UTC)

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