Population estimates of the wood mouse (Apodemus sylvaticus) as an apparent function of grid size
2001
Verhagen, R. (Universiteit Antwerpen (Belgium). Evolutionaire Biologie)
Density estimates, survival rates and trappability in Apodemus sylvaticus (Linnaeus, 1758) as a function of grid size were studied. The four grid sizes ranged from 1.2 to 8.2 ha. Density estimates obtained with the minimum number alive method were similar for all grid sizes but those obtained with the Jolly-method were highly biased for the two small-est grids. Survival rates and trappability improved considerably as grid size increased. Differences between small and large grids were most pronounced in summer when the animals averaged longer movements than in winter. The size of the grid as well as rapid seasonal changes in the movement patterns of the animals does have a definite influence on the magnitude of the edge effect.
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