Variation in cold hardiness during overwintering in Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae)

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The seasonal variation in cold hardiness was studied in a field population of overwintering adults of the red firebug, Pyrrhocoris apterus (Linnaeus, 1758) from South Bohemia. Two processes/steps during the autumnal cold acclimation were distinguished: (1) in response to gradually decreasing temperatures higher than 5°C, the supercooling point (SCP) decreased to a median of -18.6°C, but the survival after exposure to -15°C remained low (Lt50-₁₅=2.2 days); (2) during further cold acclimation at temperatures lower than 5°C, the SCP remained relatively stable, but the capacity developed to survive at -15°C for extended periods of time. Whereas the depression of SCP proved to be independent of the accumulation of "winter" polyols (ribitol and soritol), there was a tight linear relationship (r=0.95) between the total haemolymph concentration of winter polyols (seasonal max.=88.9 mM) and the Lt50-₁₅ (seasonal max.=17.5 days), which points toward a potential non-colligative cryoprotectant role for these compounds. … full description

Bibliographic Details

Main Author

Vladimír Košťál, 1963-

Other Authors

Martin Šlachta, 1975-

Document Type

Articles

Physical Description

Grafy.

Published in

Acta Societatis zoologicae Bohemicae. -- ISSN 1211-376X. -- Roč. 65, č. 3 (2001), s. 239-245

Subjects

ploštice

Heteroptera

ruměnice > diapauza > odolnost vůči chladu > tolerance chladu > přechlazení > kryoprotektanty > polyoly > Pyrrhocoris > diapause > cold hardiness > chill tolerance > supercooling > cryoprotectants > polyols

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