Variation in cold hardiness during overwintering in Pyrrhocoris apterus (Heteroptera: Pyrrhocoridae)
| Autor: | Košťál, Vladimír, 1963- |
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| Další autoři: |
Šlachta, Martin, 1975-
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| Jazyk: | angličtina |
| Předmět: | |
| Druh dokumentu: | Non-fiction |
| ISSN: | 1211-376X |
| Abstrakt: | Abstract: 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. |
| Databáze: | Katalog Knihovny AV ČR |
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