Alfimov A.V.1, Marusik Yu.M.1,2 2022. Heat supply on the northern distribution limit of spiders (Arachnida: Aranei) living in xeromorphic habitats of the Kolyma River lower reaches, Northeastern Siberia // Euroasian Entomological Journal. Vol.21. No.6: 348–352 [in English].
1 Institute for Biological Problems of the North, FEB Russian Academy of Sciences, Portovaya Str. 18, Magadan 685000 Russia.
2 Department of Zoology & Entomology, University of the Free State, Bloemfontein 9300 South Africa.
doi 10.15298/euroasentj.21.6.06
ABSTRACT. In this paper, we have analyzed the heat supply on the northern distribution limit of 65 spider species found in the warmest habitats of the lower reaches of Kolyma River. Kolyma River’s mouth is the northernmost locality for 32 species with a Holarctic range and for nine species with a Palaearctic range. We found that among 39 species distributed in both Asia and the Nearctic, the demand for heat supply on the two continents is similar only for 1/3 of the species. Approximately half of the species with a Holarctic range found in the lower reaches of Kolyma River have been reported in North America from localities with a lower heat supply. This indicates that these species can be found in more northern and colder regions in Asia, where coastal areas are poorly studied.
KEY WORDS: Araneae, Western Chukotka, Nearctic, Palaearctic, north limit of range, heat supply.