Na osnovanii 29-letnikh kompleksnykh nablyudenii za chislennost'yu i demograficheskoi strukturoi naseleniya ryzhei polevki, meteorologicheskimi usloviyami i obiliem zimnikh kormov vyyavleny osnovnye faktory, opredelyayushchie zimnee ili vesennee razmnozhenie. Pokazano, chto podsnezhnoe razmnozhenie v usloviyakh Udmurtii – yavlenie dostatochno regulyarnoe i nablyudaetsya primerno raz v tri goda. Dlya zimnego razmnozheniya neobkhodima dopolnitel'naya energiya - primerno polovina energii, zatrachivaemoi populyatsiei za ves' reproduktivnyi sezon. Otseneno vliyanie srokov nachala razmnozheniya na sezonnuyu dinamiku i protsessy formirovaniya populyatsionnykh tsiklov. Faze “pik” v bol'shinstve sluchaev predshestvuet podsnezhnoe razmnozhenie. Razmnozhenie v gody, otnosyashchiesya k faze “depressii”, kak pravilo, nachinaetsya v aprele-mae (vesennee razmnozhenie). Mezhdu fazami populyatsionnogo tsikla i srokami nachala reproduktivnogo perioda net svyazi. Zimnemu razmnozheniyu predshestvuyut vysokii urozhai semyan lipy v predydushchem godu, vysokaya reproduktivnaya aktivnost' zver'kov v kontse predydushchego sezona razmnozheniya i mnogosnezhnaya zima.

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