Dispausing larvae of the midge Aphidoletes aphidimyza (Diptera: Cecidomyiidae) survive at subzero temperatures in a super cooled state but tolerate freezing if inoculated by external ice

Title:

Dispausing larvae of the midge Aphidoletes aphidimyza (Diptera: Cecidomyiidae) survive at subzero temperatures in a super cooled state but tolerate freezing if inoculated by external ice

Creator:

Košťál, Vladimír and Havelka, Jan

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3294feab-d102-4946-aa9a-fab6b1db8346
uuid:3294feab-d102-4946-aa9a-fab6b1db8346

Subject:

Aphidoletes aphidimyza, Cecidomyiidae, Diptera, diapause, cold hardiness, supercooling, freezing, and survival

Type:

article, model:article, and TEXT

Description:

Diapausing larvae of Aphidoletes aphidimyza (Diptera: Cecidomyiidae) had relatively low supercooling points (SCP) ranging from -19.0 to -26.4°C. None of the specimens that froze at this temperature survived. A high survival rate (up to 87%) at -10°C for 10 days was observed in supercooled larvae. Such features are characteristic for insects that use a chill-tolerance strategy of cold hardiness. However, the cocoons formed by the diapausing larvae were penetrable by external ice crystals and the larvae showed a relatively high survival rate (23 - 34%) at -10°C for 10 days also in the frozen state caused by inoculation by external ice at high subzero temperatures. Such a duality with respect to cold hardiness strategies seems to be ecologically relevant to overwintering in soil habitats where there may be unpredictable contact with external ice.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2000 Volume:97 | Number:3

Harvested from:

CDK

Metadata only:

false