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EN
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 LTemp₅₀. 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°C for gooseberry sawfly larvae and ranged from –5.0°C for male hornets to –9.1°C for queen hornets. These differences seem to reflect reasonably the specific thermal environment adaptations of the studied insects.
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Content available remote A method for simple assessment of cold sensitivity in insects
100%
EN
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.
EN
As a result of the investigation on Aculeata (Hymenoptera) carried out in the years 1992-1996 and 2003-2005 in railway areas in Łódź, 114 species were found. Chrysis equestris, Ch. gracillima, Dolichurus corniculus, Passaloecus clypealis, Solierella compedita and Tachysphex fulvitarsis are rare species in Poland.
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2000
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tom 101
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nr 04-06
131-132
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