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KMID : 0380120010240040233
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Korean Journal of Ecology
2001 Volume.24 No. 4 p.233 ~ p.237
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Soil Oribatid Mite Acari Settling in the Forest Litter in the Different Microenvironments in Mt. Jumbong, Korea
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Kang, Bang Hun
Lee, Joon Ho/Choi, Seong Sik
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Abstract
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Changes of the oribatid mite species composition during the litter decomposition was investigated in the north-facing and south-facing slopes with different lower vegetation (annual herbaceous plants in north and perennial Sasa in south) in the altitude 1,000 m of Mt. Jumbong, a nature reserve area in Korea, from August 1994 to September 1995. Total 58 species of oribatid mites were collected. The values of Olson´s negative exponential index (k) were -0.56 in the south-facing slope and -0.49 in the north-facing slope, but there was no significant difference between them. The decomposition rate of litter increased rapidly until Oct. 1994, and decreased thereafter. Intensive settlement of the forest litter by oribatid mites was recorded in the autumn periods and it decreased in the next spring and summer. Species diversity index (H´), and species evenness (J´) ranged from 1.74 to 2.69 and from 0.57 to 0.93, respectively, and the values were lowest in spring. In the successive periods of growing season, there followed great changes in the structure of species dominance. Heminothrus minor was one of the most dominant species in autumn in the first year when litter were placed, but was never recovered next seasons. In contrast, Platynothrus yamasakii was also dominant in the first autumn, then decreased very low in numbers in next spring and summer, but regained its number in autumn. On the other hand, an increase of the number during these periods was observed by Epidamaeus sp. 2. Ceratopia bipilis and Epidamaeus sp. 1 were abundant both in the north and south-facing slopes. Trichogalumna nipponica was only found in the south-facing slope, and Nahermannia elegantula was only found in the north-facing slope.
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