I. Trisnawati and K. Nakamura

Abundance, diversity and distribution of above-ground arthropods collected by window traps from satoyama in Kanazawa, Japan: an order level analysis.

Number: 181, Pages: 1 - 23

Satoyama, the traditional rural landscape of Japan, has been paid much attention because, beside its many important roles, it is a key to biodiversity conservation in Japan . The effects of habitat heterogeneity and restoration activities on the abundance and diversity of above-ground arthropod assemblages were studied using window traps in a "satoyama area" within Kanazawa University's Campus, Kanazawa, Japan in 2005 and 2006. Monthly samples were taken at upper and ground levels from nine sites, including forested areas and valley areas with paddies under restora­tion. A total of 93,134 individuals from 24 orders, including 18 Insecta orders, 3 Arachnida, 2 Crustacea and 1 Chilopoda, were collected during the study, and an order level analysis was carried out. At the upper level, Diptera was the dominant order (about 70 %), followed by Homoptera and Coleoptera (5-10 %), and at ground level, Diptera (about 40 %), Collembola (10 %), and ants (8 %) were dominant. DCA ordination revealed a clear separation of arthropod order compositions among different habitat types and between upper and ground levels, but the separation was less apparent between years. DCA ordination of 18 orders revealed the variation of spatial distribution of these orders in accordance with habit ("flying" or "non-flying") and habitat preference ("forests" or "cultivated valley" sites).

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