Migration of the Northern Boundary of the Siberian Silkmoth Habitat
V. I. KHARUK1,2, S. T. IM1,2,3, M. N. YAGUNOV4
1V. N. Sukachev Institute of Forest, 660036, Krasnoyarsk, Akademgorodok, 50/28
2Siberiаn Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
3Reshetnev Siberian State University of Science аnd Technology, 660041, Krasnoyarsk, Krasnoyarskii rabochii ave., 31
4Forest Protection Center of Krasnoyarskii Krai, 660036, Krasnoyarsk, Akademgorodok, 50a/2
Keywords: сибирский шелкопряд, изменения климата, насекомые-дендрофаги, вспышки размножения насекомых, ареалы дендрофильных насекомых, Siberian silkmoth, climate change, dendrophagous insects, pest outbreaks, pest ranges
Abstract
Climate changes induced migration of Siberian silkmoth ( Dendrolimus sibiricus Tschetv., one of the most dangerous pest in taiga) outbreaks northward. The initial outbreak of the Siberian silkmoth began in 2014 in the Siberian pine-fir stands within the Yenisei plain on the south-west gentle slopes at elevations up to 200 m above sea level. Later on, the outbreak extended to the forest with higher humidity, northern slopes and Yenisei Ridge low and middle elevations. The limit of the outbreak zone shifted up to 50 km (to 60о26' N) northward from the historical boundary of formerly observed outbreaks. The outbreak was incited by increasing aridity and sum of positive temperatures ( t > +10 оC), and decreasing top soil moisture, and extended to the area up to 800,000 ha. Stands mortality was accompanied by activation of the secondary pests, including aggressive bark-beetle species Polygraphus proximus. The studied outbreak is a part of the pan-zonal outbreak which occurred in 2014-2017 on the territory of Siberia (Krasnoyarsk Krai, Tomsk, Kemero and Irkutsk Oblasts). The observed increase of warming, aridity and vegetation period extension open opportunities for Siberian silkmoth migration to the northern darkneedle taiga.
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