Abstract
Previously, other authors recognized that female mosquitoes Culex territans Walker were active at relatively low temperatures after overwintering and were able to complete their first gonotrophic cycle at temperatures close to +4°C. The present study demonstrated relatively high tolerance of diapausing Cx. territans females, collected from near-entrance parts of caves, to short-term freezing (20–30 min at −9…−11°C). The proportion of individuals that survived short-term freezing in an experiment was higher among Cx. territans than among Cx. pipiens/torrentium collected simultaneously with Cx. territans from the same hibernacula. The difference between Cx. territans and Cx. pipiens L. was statistically significant, while that between Cx. territans and Cx. torrentium Martini was nonsignificant, despite the similar proportions of survivors among Cx. pipiens and Cx. torrentium. The new data give direct support to the hypothesis that adult females of Cx. territans are adapted to low temperatures. Obviously, there are special physiological mechanisms in overwintering Cx. territans females underlying their tolerance to short-term freezing.
REFERENCES
Bartlett-Healy, K., Crans, W., and Gaugler, R., Temporal and spatial synchrony of Culex territans (Diptera: Culicidae) with their amphibian hosts, J. Med. Entomol., 2008, vol. 45, no. 6, p. 1031. https://doi.org/10.1093/jmedent/45.6.1031
Becker, N., Petric, D., Zgomba, M., Boase, C., Madon, M., Dahl, C., and Kaiser, A., Mosquitoes and Their Control. Second Edition, Berlin etc.: Springer, 2010. https://doi.org/10.1007/978-3-540-92874-4
Börstler, J., Lühken, R., Rudolf, M., Steinke, S., Melaun, C., Becker, S., Garms, R., and Krüger, A., The use of morphometric wing characters to discriminate female Culex pipiens and Culex torrentium, J. Vector Ecol., 2014, vol. 39, no. 1, p. 204. https://doi.org/10.1111/j.1948-7134.2014.12088.x
Denlinger, D.L. and Armbruster, P.A., Mosquito diapause, Annu. Rev. Entomol., 2014, vol. 59, p. 73. https://doi.org/10.1146/annurev-ento-011613-162023
Gutsevich, A.V., Monchadsky, A.S., and Stackelberg, A.A., Komary. Semeistvo Culicidae. Fauna SSSR. Nasekomye dvukrylye (Mosquitoes, Family Culicidae. Fauna of the USSR. Insecta, Diptera), Leningrad: Nauka, 1970.
Kim, M., Robich, R.M., Rinehart, J.P., and Denlinger, D.L., Upregulation of two actin genes and redistribution of actin during diapause and cold stress in the northern house mosquito, Culex pipiens, J. Insect Physiol., 2006, vol. 52, no. 11, p. 1226. https://doi.org/10.1016/j.jinsphys.2006.09.007
Mehta, C.R. and Patel, N.R., Exact Tests, Chicago: SPSS Inc., 2012.
Morey, R.D., Rouder, J.N., Jamil, T., Urbanek, S., Forner, K., and Ly, A., BayesFactor: Computation of Bayes Factors for Common Designs, 2014 (accessed December 31, 2021). https://cran.r-project.org/src/contrib/Archive/BayesFactor/
R Core Team, R: A Language and Environment for Statistical Computing, Vienna: R Foundation for Statistical Computing, 2022 (accessed July 23, 2022). https://www.r-project.org/
R Documentation, 2023 (accessed March 8, 2023). https://www.rdocumentation.org/packages/stats/versions/
Razygraev, A.V., Abundance of male mosquitoes of the genera Culiseta and Culex (Diptera, Culicidae) in near-entrance parts of caves as a reflection of their different tolerance to low outdoor temperatures, Parazitologiya, 2020, vol. 54, no. 2, p. 137. https://doi.org/10.31857/S1234567806020042
Razygraev, A.V., Difference in the distribution of overwintering female mosquitoes of the genera Culex and Culiseta (Diptera, Culicidae) in near-entrance parts of caves in relation to air temperature and humidity, Entomol. Rev., 2021, vol. 101, no. 9, p. 1293. https://doi.org/10.1134/S0013873821090074
Razygraev, A.V., Activity of catalase in overwintering females of mosquitoes Culex pipiens, Culex torrentium, and Anopheles maculipennis s. l. (Diptera: Culicidae), Tr. Zool. Inst. Ross. Akad. Nauk, 2022, vol. 326, no. 4, p. 294. https://doi.org/10.31610/trudyzin/2022.326.4.294
Razygraev, A.V., Catalase enzymatic activity in adult mosquitoes (Diptera: Culicidae): taxonomic distribution of the continuous trait suggests its relevance for phylogeny research, Zootaxa, 2023, vol. 5339, no. 2, p. 159. https://doi.org/10.11646/zootaxa.5339.2.3
Razygraev, A.V. and Sulesco, T.M., The use of the Bayes factor for identification of Culex pipiens and C. torrentium (Diptera: Culicidae) based on morphometric wing characters, Entomol. Rev., 2020, vol. 100, no. 2, p. 220. https://doi.org/10.1134/S0013873820020104
Rinehart, J.P., Robich, R.M., and Denlinger, D.L., Enhanced cold and desiccation tolerance in diapausing adults of Culex pipiens, and a role for Hsp70 in response to cold shock but not as a component of the diapause program, J. Med. Entomol., 2006, vol. 43, no. 4, p. 713. https://doi.org/10.1093/jmedent/43.4.713
Sim, C. and Denlinger, D.L., Catalase and superoxide dismutase-2 enhance survival and protect ovaries during overwintering diapause in the mosquito Culex pipiens, J. Insect Physiol., 2011, vol. 57, no. 5, p. 628. https://doi.org/10.1016/j.jinsphys.2011.01.012
Vinogradova, E.B., Culex pipiens pipiens Mosquitoes: Taxonomy, Distribution, Ecology, Physiology, Genetics, Applied Importance and Control, Sofia–Moscow: Pensoft, 2000.
Wilkerson, R.C., Linton, Y.M., and Strickman, D., Mosquitoes of the World, Baltimore: Johns Hopkins University Press, 2021.
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I thank the anonymous reviewers for helpful comments and suggestions concerning further research.
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This work was carried out within the framework of the State Research Assignment 122031100263-1.
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Razygraev, A.V. Evidence of High Tolerance to Short-Term Freezing in Overwintering Mosquitoes Culex territans Walker (Diptera, Culicidae). Entmol. Rev. 103, 270–275 (2023). https://doi.org/10.1134/S001387382303003X
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DOI: https://doi.org/10.1134/S001387382303003X