Environmental Factors Influencing the Habitat of Orthoptera in the Reclaimed Land of the Harbor Area

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  • 横浜市金沢区の港湾部埋立地における直翅目の分布状況とそれに影響を及ぼす環境要因
  • ヨコハマシ カナザワク ノ コウワンブ ウメタテチ ニ オケル チョクシモク ノ ブンプ ジョウキョウ ト ソレニ エイキョウ オ オヨボス カンキョウ ヨウイン

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Abstract

A study was conducted on Orthoptera (Acrididae, Tettigoniidae, Gryllidae) in 56 sites of reclaimed land of Kanazawa District, Yokohama City, Kanagawa Prefecture through May to October of 2008. 28 species and 1941 individuals were recorded during this study. By using TWINSPAN and partitioning, classifications of the Orthoptera and study sites were made based on the results of this study. Also we investigated concerning vegetation, soil, distance from original land,and area coverd with vagetation around field as environmental factors. The study sites were sorted into 5 groups and the Orthoptera were sorted into 4 groups by using TWINSPAN. Based on 5 study site groups, partitioning analysis was conducted.Results suggest vegetation height, coverings of evergreens and deciduous trees of middle to high height, and distance from original land are related to Orthoptera inhabitation. However, it has not been clearly understood the distance from original land was selected as explanatory variable. A further verification is necessary because of the possibility that area coverd with vegetation around the field is related was suggested.

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