@article{oai:soar-ir.repo.nii.ac.jp:02002074,
 author = {竹田, 謙一 and Takeda, Ken-ichi and 松本, 歩 and Matsumoto, Ayumi and 塚田, 英晴 and Tsukada, Hideharu and 保倉, 勝巳 and Hokura, Katsumi},
 journal = {信州大学農学部AFC報告},
 month = {Mar},
 note = {本研究では、ウシの放牧に伴うシカの個体数密度の変化を調査した。調査は、カラマツが優占する林地内放牧地（標高約1,300m）で行った。放牧に用いた林地内放牧地（8.5ha）は有刺鉄線フェンスで囲まれ、９月24日から１ヵ月間、４頭の黒毛和種繁殖牛が放牧された。牧草地の北側にフェンスに沿って１本、対照区として、そのフェンスから150m離れた北側に１本、計２本のライントランセクト（３×150m）を設置した。植生調査と糞粒採取は2003年９月18日から11月６日まで実施し、各トランセクトの林地内放牧地内外の草量と糞粒数を１週間ごとに記録した。各調査において、各ライントランセクト近隣の林内放牧地内外の５カ所を無作為に選び、その場所に置いた１×１mコドラート枠内で出現草種を地際から刈り取り、その現物重を測定した。その後、各トランセクトで発見された糞粒数からシカの個体数密度を推定した。翌週の調査で糞粒数の記録が重複しないよう、糞粒は発見されるたびに回収した。林地内放牧地内の草量は、放牧開始とともに徐々に減少した。両ライントランセクトのシカ個体数密度は放牧期間中に有意に異なった（p<0.01）。放牧開始直後は柵沿いラインで生息密度が大きく減少した。その後、草量の減少とともにシカの個体数密度は減少した。対照区では、放牧３週目までシカの生息密度は大きく変化せず、４週目に減少した。退牧２週間後、シカの生息密度はいずれのライントランセクトでも増加した。, In this study, we investigated the changes in the deer population density associated with cattle grazing. The study was conducted in a woodland pasture-dominated larch (approximately 1,300 m above sea level). The woodland pasture (8.5 ha) used for grazing was surrounded by a barbed wire fence, and four Japanese black cows were grazed there for 1 month from 24 September. Two line transects (3 x 150 m) were set up: one along the fence on the north side of the pastureland and one 150 m away from the fence on the north side as a control area. The vegetation survey and faecal pellet sampling were conducted from 18 September to 6 November 6, 2003, and the amount of grass inside and outside the woodland pasture and the number of faecal pellets in each transect were recorded every week. We randomly selected five harvesting locations for each survey, both inside and outside the woodland pasture, near each line transect. We harvested plants within a 1 × 1 m quadrant frame, and determined the fresh weight of the plants. The deer density was then estimated based on the number of faecal pellets found in each transect. To avoid duplicating records in the following week’s survey, we collected the faecal pellets each time they were found. The amount of grass inside the woodland pasture gradually decreased with the start of grazing. The deer density in both line transects significantly differed during the grazing period (p < 0.01). Immediately after the start of grazing, the density decreased greatly in the transects along the fences. Subsequently, the density decreased with the decrease in the amount of grass. In the control area, the density did not change substantially until the third week of grazing, but decreased in the fourth week. Two weeks after the end of grazing, the density increased in both the line transects. We conclude that the deer may have avoided the area due to cattle grazing., Article, 信州大学農学部AFC報告 22 : 1-6, (2024)},
 pages = {1--6},
 title = {ウシの放牧に伴うシカの個体数密度の変化},
 volume = {22},
 year = {2024}
}