Abstract
Sex distribution among 160911 moose calves, harvested in 22 Swedish counties during the period 1970-1978, was subjected to statistical analysis. Sex ratio heterogeneity was highly significant in both time and space. The proportion of males within single combinations of county and year varied between 51% and 69% and the weighted mean proportion decreased almost linearly from 60% in 1970 to 55.5% in 1978. The high intrinsic growth rates characteristic for the Scandinavian moose make it vital that management decisions are based on a thorough knowledge of the calf sex ratio. If the calf sex proportion is assumed to be five percentage points above the true value, a harvesting regime aimed at maintaining constant population numbers may result in the population actually being doubled in less than ten years; if assumed to be five percentage points below, the same population may instead be reduced to half its original size within the same period.
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