The Ecological Structure of Sable Populations in the Nidus
of Filaroides Invasion

V. G. Monakhov

Institute of Plant and Animal Ecology, Ural Division, Russian Academy of Sciences, ul. Vos’mogo Marta 202, Yekaterinburg,
620144 Russia

Received May 6, 1998

Abstract—Dynamics of the age and sex structure and demographic characteristics of sable populations in the
nidus of helminthiasis caused by the nematode Filaroides martis in the trans-Ural region and the Ob’ basin were
studied. In the infected animals, the total mortality rate was 1.5 to 2.8 times higher, the average life-span was
2.5 times smaller, and the potential female fertility was lower than in uninfected animals. However, the greatest
female fertility was found in areas with the most extensive helminth invasion, which is hypothesized to be a
population adaptation to the high elimination rate.

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