@techreport{oai:soar-ir.repo.nii.ac.jp:00017067,
 author = {別府,  桂},
 month = {Mar},
 note = {ln order to know effect of human life aI1.d activities on ponds in Shiga Heights where it is known as a famous tourist resort， seven ponds， which are located along the Shiga-Kusatsu toll road，w ere surveyed in 1983. As two domestic drosophilid species (D. melanogaster and D. busckii) are strongly connected with garbage and leavings，t hese two species were adopted as the indicator species of pollution by human life and activities. Although these species were not col1ected or very rare at three ponds (Nagaike，M isumaike and Shibuike)，th ey weIie abundant at remaining four ponds (Biwaike，l chinuma，M aruike and Kidoike). From this result it is allowed to conclude that the latter four ponds are polluted by human life and activities， but the former three ponds are not so. Hotels，i nns and rental boat shops are seen near Biwaike，M aruike and Kidoile，so that many tourists and hikers take a rest near these ponds in summer. As drainage and garbage， in addition to picnic leavings of hikers，f lowed into these ponds from these hotels and inns， abundance of the indicator species would be due to these factors. On the other hand，th e former three ponds are surrounded by natural forests，a nd hotels and inns are not seen near these ponds，th ough two lodges are seen near Nagaike. This is suggestive that natural forests are useful to keep these domestic species away from the ponds, Article, 信州大学環境科学論集7:66-70(1985)},
 title = {志賀高原の湖沼の汚染状況},
 year = {1985}
}