著者

石沢 慈鳥

出版者

The Ornithological Society of Japan

雑誌

鳥 (ISSN:00409480)

巻号頁・発行日

vol.16, no.78, pp.409-413, 1961-12-15 (Released:2009-02-26)

被引用文献数

3 1

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Judging by the personal reports received by the author from lighthouse keepers in various parts of Japan, the following may be suggested as possible behaviour of night migrants, particularly the Passrines. 1) The passage of night migrants is noticed offshore rather than ashore where there are islands and capes to avoid, and they fly low close to the seasurface. 2) As generally said, they migrate in clear nights, but when the sky suddenly became overcast or rainy, they may be lost and if a lighthouse were close enough its dim light may attract them. In such cases, some of them die struck at the lighthouse and others spend the night nearby to start again in the next favourable evening. In clear night this never happens. 3) The second case of migrant destruction at lighthouses occurs when the weather was good during the day and became cloudy or rainy towards evening. On such a day, migrants gathering around lihthouse at a cape where there are usually good cover for rest, become restless to start for night flight, but the sudden overcast condition urges them only to fly around the light and some or numbers of them will strike at it. 4) Stronger the light the more migrants are attracted from greater distances and the lighthouse at more unstable weather condition is responsible for more migrant victims. 5) In recent years, however, the birds struck at lighthouses has become extrmely fewer, owing possibly to: a) the genereal decrease of bird numbers and b) increase of coastal village lights and lights of fishing boats on the coastal seasurface.

著者

石沢 慈鳥 千羽 晋示

出版者

Yamashina Institute for Ornitology

雑誌

山階鳥類研究所研究報告 (ISSN:00440183)

巻号頁・発行日

vol.5, no.1, pp.13-33, 1967-06-30 (Released:2008-11-10)

参考文献数

6

被引用文献数

3 4

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Stomach contents of the following 12 species, 202 individuals of hawks collected by the sinior author during 1924-1937 in nothern part of Japan were analysed by the junior author: Falco peregrinus(5), F. columbarius(6), F tinnunculus(13), Buteo buteo(57) Spizaetus nipalensis(6), Circus aeruginosus(5), Accipiter gentilis(14), A. nisus(41), A. virgatus(23), Milvus migrans(15), Pernis apivorus(12), and Butastur iudicus(6), The specimens were collected throughout the year but more in winter except from some buzzards, goshawks, sparrow-hawks, honey buzzards and buzzard-hawks, the last two being summer visitors.The result can be shown by the table below:It is to be noted that although many passerine birds are taken by these hawks, the Tree Sparrow, which is the seasonal pest to rice crops, far more outnumbered other species; for example, it occupied 73% of the diet of Sparrow-hawk, Accipiter nisus.

著者

石沢 慈鳥

出版者

日本鳥学会

雑誌

鳥 (ISSN:00409480)

巻号頁・発行日

vol.17, no.79, pp.213-217, 1962

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Hegura I. is a small flat island with almost no tree, situated 27.5 miles from the tip of Noto Peninsula. Very few birds have hitherto been recorded. The author received lighthouse-struck birds four times in May and June, 1961 and 1962 These are, <i>Turdus sibiricus, Larvivora cyane, Motacilla cinerea, Muscicapa alseonax, Mnscicapa griseisticta, Muscicapa narcissina, Locustella fasciolata, Locustella lanceolata, Locustella ochotensis, Phylloscopus borealis</i> and <i>Acrocephalus bistrigiceps, Lobipes lobatus</i>.<br>These records support author's previous view that passerine migrants migrateoffshore rather than close to it and the lighthouse may often benifit them for temporal landing in cloudy and bad weathers (all above birds were obtained in such conditions), though small part of it may die by striking at it.

著者

石沢 慈鳥

出版者

日本鳥学会

雑誌

鳥 (ISSN:00409480)

巻号頁・発行日

vol.15, no.71, pp.45-46, 1958

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The Scops Owl, being a small sized species, feeds almost exclusively on insects. Oka's two December records should be unhealthy birds which remained until early winter. There may be a probability of its wintering in warmer parts in Japan, such as Amami-Oshima as given in the Hand-list (1958), where food insects are to be found in this season. But, the author rather believes, as mentioned by Yamashina (1931), that it is a summer migrant, because La Touche reports it as winter bird from central and southern parts of E. China.

著者

石沢 慈鳥

出版者

The Ornithological Society of Japan

雑誌

鳥 (ISSN:00409480)

巻号頁・発行日

vol.17, no.79-80, pp.217-218, 1962-12-31 (Released:2009-02-26)

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A male specimen of Plectrophenalis nivalis was obtained by Mr. Kashiwagi at the mouth of River Kurobe, Toyama, 26 November, 1961 This is the second example from Honshiu and the specimen was sent to Yamashina Museum of birds.