赤坂御用地と常盤松御用邸の異翅半翅類(昆虫綱)

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As a part of three-year inventory research project "Fauna of the Akasaka Imperial Gardens and the Tokiwamatsu Imperial Villa, Tokyo" conducted by the National Science Museum, Tokyo, a total of 80 species of the Heteroptera in 23 families are recorded from the research areas. The Akasaka Imperial Gardens and the Tokiwamatsu Imperial Villa are located in the center of Tokyo Metropolis several kilometers southwest of the Imperial Palace. Although these areas are now surrounded by highly urbanized environment, well-preserved vegetations still remain there. Since the Garden and the Villa have strictly been protected as the special precincts belonging to the Imperial Household, the fauna in the areas has quite poorly been investigated up to the present. This is the first report on the heteropterous fauna of the areas. The number of species from the Garden and the Villa is very small in comparison with that from the Imperial Palace (Table 1). Two reasons can be considered about it: firstly, insufficiency of the survey both in quantity and quality; and secondly, poorer habitat for the heteropterous insects than in the Imperial Palace. Survey in the Palace was made on 22 days from 1996 to 1999, but only on 7 days from 2002 to 2004 in the present survey. The second reason may be much more influential on existence of the insects. The Garden (ca. 51 ha) and the Villa (ca. 2 ha) have only a half area in total as the Palace. Besides this, the greater part of the green tracts of the Garden and the Villa are maintained well and natural vegetation and leaf-litter layer cover only a small area. The Garden and the Villa do not provide good habitat for aquatic Heteroptera. There is neither streams nor large ponds or moats grown with rich aquatic plants like Dokan-bori moat in the Imperial Palace. The majority of the heteropterous species recorded herein are very common even in the Kanto region including Tokyo. However, two endangered species were found there, i.e., Isometopus japonicus and Acrorrhinium inexpectatum. Hoplitocoris lewisi also becomes extinct in urban areas. Paloniella sp. is possibly an undescribed species. Although the environment of the Garden and the Villa may be less preferable for the heteropterous insects than that of the Imperial Palace, it still maintains a high value as a habitat of these insects in the large city of Tokyo.
国立科学博物館の論文
2005-03-25

赤坂御用地と常盤松御用邸の異翅半翅類(昆虫綱)

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