Changes in forest area over a 31-year period (1975-2006) on the Kinkazan Island, Miyagi Prefecture, Japan, with sika deer (<i>Cervus nippon</i>)

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  • ニホンジカが生息する宮城県金華山における31年間（1975-2006年）の森林域の変化

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<p>In order to clarify the effects of long-term foraging pressure by sika deer on forest vegetation, we conducted a study on changes in forest area over a 31-year period by reading aerial photographs taken in 1975 and 2006 at Kinkazan Island in Miyagi Prefecture, which is inhabited by a high density of deer (40-60 deer/km2). As a result, the forest area was greatly reduced, the fir- and beech-forest areas, which the typical forest vegetation, had not recovered 12.8 ha and 14.9 ha, respectively. The rate of decrease was about 0.4-0.5 ha/year, and the decrease was mostly at around the forest edge near the grassland. On the other hand, forest expansion was more pronounced in the area where vegetation protection fences, but was also observed in areas where no fences were installed, probably due to the sheltering effect of the non-preferred plants.</p>

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