1 Herzen State Pedagogical University, St. Petersburg, Russia.
2 Zoological Institute, Russian Academy of Sciences, St. Petersburg, Russia. Ludmila.Chistyakova@zin.ru.
3 Emelianov North-Western Research Institute of Dairy and Meadow Pasture Farming, Vologda Research Center of the Russian Academy of Sciences, Vologda, Russia.