トラップ採集法による結果 (準自然域におけるショウジョウバエ集団の研究-1の1・2-〔英文〕)
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Aspects of Drosophila populations in a semi-natural state carrying various kinds of vegetations in the University Gardens at Sapporo were investigated during the years 1953 through 1962. A general account of the Gardens and some of the climatological features are described. For this study collections of drosophilid flies on a large scale have been done with the use of banana traps at a single site during the ten years. Collections were made monthly from May to October, except in 1953 and 1955. These collection dates and times are shown in Table 1. In 1959 differential attraction of drosophilid species to five different kinds of yeasts was examrnd using fermenting banana bait, in which the test yeast was actually growing, at three different sites in the Gardens.During the period of this survey, a total of 46, 619 specimens of fourty-three species of Drosophilidae was obtained by the method of trapping. These collection data were summarized in Table 3.Population sample obtained from the semi-natural areas in traps of banana bait, has been constructed from two “abundant”. seven “common” and thirty-four “rare” species. Relative frequencies of the thirteen leading species are shown in Table 5. Among the “abundant” and “common” species, D. auraria race A (a representative of the auraria species population in this Gardens), D. nigromaculata, D. lutes, D. brachynephros, D. immigrans and D. suzukii have been found to be domestic forms closely associated with man, while D. testacea, D. bifasciata and D. lacertosa have had wild habitats throughout Hokkaido. Yearly changes in the relative frequencies of abundance of these species were more conspicuous in “common” species than in “abundant” ones. Mean humidity and rainfall shown by each year or each collecting season during the ten years seem to exert no influence upon the relative frequencies of these drosophilid species. Variations in the other environments in this Gardens may occur from year to year affecting such frequencies of Drosophila species.The distribution and preferences to yeast of drosophilid species in this Gardens are described. Abundant and more common species showed generally larger adaptive abilities in relation to the collecting sites and to the yeasts than less common species so far investigated. Percentage frequency of females in total drosophilid flies sampled by banana traps during nine years (1954-1962) was 45.61. Only one species, D. testacea, among the “abundant” and “common” species showed female superiority with the frequency of 59.85 percent. Sex-ratios of most of the species seem to be affected more or less by collecting site and yeast attractant.
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関連論文
- トラップ採集法による結果 (準自然域におけるショウジョウバエ集団の研究-1の1・2-〔英文〕)
- Drosophila Survey of Hokkaido I.Description of a New Species,Drosophila alboralis sp.nov.(Subgenus Hirtodrosophila)
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