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1 Polish Journal of Ecology

1 2010

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A method for simple assessment of cold sensitivity in insects

Nadolski J., Bańbura J.

Polish Journal of Ecology

2010

Vol. 58, nr 1

187-190

A simple index of sensitivity to frost in insects for the general use in ecological studies was introduced. The index is based on a cooling experiment that leads to the estimation of the subzero temperature at which 50% of a sample of particular species life form individuals are killed within 24 hours. By analogy to toxicology, such an estimate was called LTemp[50]. We present the method using our results from a series of simple cooling experiments conducted on larval gooseberry sawflies Nematus ribesii (Scopoli) and imagine queens, workers and males of the hornet Vespa crabro L. LTemp50 indices were -7.2[degrees]C for gooseberry sawfly larvae and ranged from -5.0[degrees]C for male hornets to -9.1[degrees]C for queen hornets. These differences seem to reflect reasonably the specific thermal environment adaptations of the studied insects.