Vliyanie petel'nogo otlova na polo-vozrastnouyu strouktourou popoulyatsii-donora stepnogo sourka [Influence des captures au collet sur la structure d'âge et sexuelle de la population de marmotte des steppes. Influence loop capturing on a sex-age structure of the steppe marmot donor population].

Résumé

During the 1993-1995 years 721 marmots was captured by loops. Among known capturing techniques this has appeared the most effective. Alongside with appreciable advantages, loop technique has defect, inherent all passive capturing methods. It permits to capture the most active part of population. At extended capturing in a time different sex-age categories of marmot colony was capture, that conducts to displacement sex-age structure. It is established, that in June the adult males were basically withdrawed, and in July the adult females prevail. Juveniles was captured during the whole period of capturing. At a complete set of a consignment marmot, intended for acclimatization the essential significance has it a sex-age structure. A normal ratio is 3:3:4 (male:female:juvenile). Such parity can be achieved if a capturing will be spend in a period since June 15 to July 15. Realization of the loop capturing with the acclimatization purposes in other terms are not perspectively.