イヌワシ行動圏におけるノウサギの生息密度の予測と地図化

概要

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To examine the method of ecosystem impact assessment from the viewpoint of large predator species, we analyzed the relationship between environmental variables and densities of Japanese hares which are main prey for golden eagles and constructed predictive maps of the hare densities in the home range of a pair of golden eagles on Mt. Akita-Komagatake. We firstly analyzed the relationships between hare densities and vegetation types, canopy heights, altitudes, and slope inclinations by Hayashi's quantification method I. Observed values from the field survey and predictive values by the quantification models of hare densities were highly correlated, suggesting the feasibility of the models. Based on the quantification models and GIS database of environmental variables, we constructed predictive maps of Japanese hare densities. The result showed that high density areas in vegetation growing period distributed mainly on middle altitude, but those in leaf expanding period distributed mainly on relatively high altitude. GIS and quantification method I were appropriate for analyzing the hare densities in the home range of golden eagles.
2005-02-28