福原 晴夫 1) ・大高 明史 2) ・木村 直哉 3) ・菊地 義昭 4) ・山本 鎔子 5) ・ 落合 正宏 6) ・福井 学 7) ・野原 精一 8) ・尾瀬アカシボ研究グループ 9) Researches on red snow "Akashibo" in the Ozegahara mireCentral Japan: occurrence of invertebrates in red snow "Akashibo"
AbstractVarious invertebrates,nematodes,oligochaetes,harpacticoids,tardigrades,cladocerans,mites, larvae of dipteran insects (tipulids,ceratopogonids and chironomids),appeared internivean and supranivean in Akashibo snow,a kind of red snow in the Ozegahara Mire,an extensive marshland in Central Japan (altitude 1400 m,area 7.6 km 2 ). Densities of total animals were 2.4-3.6 × 10 4 ind m -2 in internivean and 0.3-2.2 × 10 3 ind m -2 on supranivean. These invertebrates seemed to migrate up from the peat surface into snow due to a decline of decrease in oxygen concentrations at subnivean environments and in/on snow during the development of Akashibo. The food web on Akashibo snow is discussed from the viewpoint of snow ecology.
The Ozegahara mire is the largest mire (altitude; about 1400 m, length; 6 km, width; 2 km, area; 7.6 km 2 ) in Honshu of Japan. Floods over mire have frequently occurred in the Ozegahara mire under recent climatic changes, resulting pouring flooded waters into many pools. Shore aquatic invertebrates were collected at 12 pools in the Kamitashiro of the Ozegahara mire in October 2018, to estimate the influence of floods on population of macroinvertebrates. The animals were collected by the unit-time sampling method using a hand net. We grouped pools into two types, 5 pools receiving occasional floods (OFPool) and 7 pools receiving frequent flooding (FFPool) based on observation of muddy pools, images by a drone, altitude of pools and invaded fishes into pools by a recent heavy flood (accumulated rainfall; 84 mm, 20-
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