title: Effects of prolonged exposure to cold on the spontaneous activity of two different types of filiform sensilla in Pyrrhocoris apterus.
abstract: We recorded the spontaneous activity of T₁ and T₂ filiform sensilla from October to May in Pyrrhocoris apterus acclimatized to outdoor conditions. The aim of the study was to determine how prolonged exposure to cold affects two closely related mechanosensitive sensilla. We recorded the activity at seven temperatures from 5 to 35 °C. In both sensilla types the activity level was reduced during winter, which correlated to changes in acclimatization temperature (r = 0.7), the reduction was greater at high recording temperatures, and the effects of exposure to cold were reversed by transferring the animals indoors. However, T₁ activity always increased monotonically, if the recording temperature was increased from 5 to 35 °C, whereas T₂ activity in cold-acclimatized animals increased to temperatures between 20 and 30 °C and then started decreasing. As a result, the temperature sensitivity of the activity was reduced more profoundly in T₂ sensilla (in T₂ Q₁₀ was reduced from 3.5 in October to 1.4 in January, whereas in T₁ it was reduced from 2.5 to 2.2). In conclusion, we have shown that prolonged exposure to cold does affect filiform sensilla; however, the effect is significantly different in the two sensilla types.
authors.affiliation: Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, 1000, Ljubljana, Slovenia, ales.skorjanc@bf.uni-lj.si.
authors.forename: Aleš
authors.initials: A
authors.lastname: Skorjanc
authors.forename: Aleš
authors.initials: A
authors.lastname: Lipičnik
authors.forename: Kazimir
authors.initials: K
authors.lastname: Drašlar
mesh_terms: D000064:Acclimatization; D000200:Action Potentials; D000818:Animals; D003080:Cold Temperature; D020062:Heteroptera / Q000502:physiology*; D006358:Hot Temperature; D008297:Male; D008465:Mechanoreceptors / Q000502:physiology*; D040542:Mechanotransduction, Cellular; D012621:Seasons; D058618:Sensilla / Q000502:physiology*; D013697:Thermosensing; D013997:Time Factors
references.citation: J Exp Biol. 2006 Oct;209(Pt 20):4102-14
references.pmid: 17023604
references.citation: J Comp Physiol A Neuroethol Sens Neural Behav Physiol. 2009 Jul;195(7):651-61
references.pmid: 19381645
references.citation: J Exp Biol. 2004 Apr;207(Pt 9):1509-21
references.pmid: 15037645
references.citation: J Insect Physiol. 2002 Nov;48(11):1009-1019
references.pmid: 12770024
references.citation: Nature. 2005 Aug 4;436(7051):647-54
references.pmid: 16079835
references.citation: Comp Biochem Physiol B Biochem Mol Biol. 2001 Oct;130(3):365-74
references.pmid: 11567899
references.citation: J Insect Physiol. 2000 Sep 1;46(9):1321-1329
references.pmid: 10844151
references.citation: J Neurobiol. 1981 Mar;12(2):123-41
references.pmid: 7217945
references.citation: Microsc Res Tech. 1997 Dec 15;39(6):506-31
references.pmid: 9438251