2 0 0 0 OA 日本産鳥類の分類•分布的研究
- 著者
- 森岡 弘之
- 出版者
- The Ornithological Society of Japan
- 雑誌
- 鳥 (ISSN:00409480)
- 巻号頁・発行日
- vol.28, no.4, pp.125-129, 1979-12-30 (Released:2007-09-28)
- 参考文献数
- 10
- 被引用文献数
- 1 2
Check-list of Japanese Birds (1974) follows VAURIE (1955, 1959) in synonymizing Turdus chrysolaus orii YAMASHINA with nominate chrysolaus. Re-examination of materials, including the type and other specimens from the Kurile Islands, has shown that the breeding males of orii, the northern Kurile population (Paramushir, Araido, Matsuwa), can be separated readily from those of nominate chrysolaus from Sakhalin, Hokkaido and Honshu, on account of the very dark coloration of their head. In this subspecies (breeding males) the head and crown is blackish sooty brown in contrast to the olive-brown nape and back, giving an appearance of being black-capped, whereas in nominate chrysolaus the upper parts are more or less uniform olive brown. The wing length and the bill height (but not bill length) of orii are also larger, although the ranges of variation overlap to some extent between the two forms (Figs. 1-2). It therefore seems to me best to retain orii as a distinct subspecies. In females, juveniles and first winter males orii is rather similar to the nominate form, but in males the characteristics of orii may become recognizable in February or March as the wear of the plumage progresses.
2 0 0 0 OA 皇居の鳥類相モニタリング調査(2000-2005年)
The avifauna of the Imperial Palace Area in Tokyo was monitored by bird censuses nearly in every two months from August 2000 to November 2005. The results were compared with the previous monthly bird census research from April 1996 to March 2000 reported by Nishiumi et al. (2000). The total number of species recorded in the 35 censuses since August 2000 was 64 species, which is composed of 20 residents, 17 winter visitors, 10 transients, and 17 irregular visitors as listed in Appendix 1, but no breeding summer visitors were recoded. In total of these 10 years, 78 species were recorded by censuses. Eleven species among them are newly recorded in this monitoring period since August 2000; Larus argentatus, Sterna sp., Cuculus poliocephalus, Anthus hodgsoni, Anthus spinoletta, Saxicola torquata, Cyanoptila cyanomelana, Terpsiphone atrocaudata, Parus montanus, Sitta europaea, Fringilla montifringilla. Apart from censuses additional 4 species were recorded; Ninox scutulata as a breeding summer visitor and Corvus corone, Fulica atra, Podiceps cristatus as irregular visitors. We found a significant decreasing trend in number of species observed in the bird census during these ten years. The number of individuals was also significantly decreased except for January and individual number of residents was conspicuously decreased, although that of winter visitors was stable or somewhat increased. Moreover, the species diversity showed significantly a decreasing trend in all of odd months.
2 0 0 0 OA 小笠原諸島父島におけるメグロの分布と絶滅
- 著者
- 鈴木 惟司 森岡 弘之
- 出版者
- 公益財団法人 山階鳥類研究所
- 雑誌
- 山階鳥類学雑誌 (ISSN:13485032)
- 巻号頁・発行日
- vol.37, no.1, pp.45-49, 2005-09-30 (Released:2007-09-28)
- 参考文献数
- 22
- 被引用文献数
- 5 6
メグロApalopteron familiare は小笠原諸島 (小笠原群島) 固有種で, 母島列島と聟島列島で分布が確認され, 前者では現在も生息, 後者では戦後の生息確認はないものの, 戦前に生息が確認されている。しかし, 小笠原群島の中央にあって最大の島父島をもつ父島列島においては, メグロの確実な生息・分布記録を示す資料が知られず, 過去における当地のメグロの分布状況は不明確なままであった。筆者らは, メグロが父島に生息していたかどうかを検討するため, メグロの記載者であるKittlitzのものを含む古い文献を再調査した。その結果, Kittlitzの書き残した文書の中に彼自身が1828年に父島でメグロを観察したことを示す記述を見いだし, メグロがかつて父島にも生息・分布, その後何らかの理由で絶滅したとの結論を得た。
1 0 0 0 鳥類
- 著者
- 樋口広芳 森岡弘之 山岸哲編集
- 出版者
- 平凡社
- 巻号頁・発行日
- 1996
1 0 0 0 OA オオセッカ Megalurus pryeri の属的帰属
- 著者
- 森岡 弘之 茂田 良光
- 出版者
- 国立科学博物館
- 雑誌
- Bulletin of the National Science Museum. Series A, Zoology (ISSN:03852423)
- 巻号頁・発行日
- vol.19, no.1, pp.37-43, 1993-03
- 被引用文献数
- 1
The generic allocation of the Japanese Marsh Warbler Megalurus pryeri is discussed. The genus Megalurus is probably a polyphyletic group. The type species of the genus is M. palustris, which is a different bird from M. pryeri in many respects. We suggest that pryeri be placed in the genus Locustella until its relationships with other sylviine species are better known.
1 0 0 0 タイ国におけるシロトキコウの記録
- 著者
- 森岡 弘之 ヤン チャンマン
- 出版者
- 日本鳥学会
- 雑誌
- 日本鳥学会誌 (ISSN:0913400X)
- 巻号頁・発行日
- vol.38, no.3, pp.149-150, 1990
- 被引用文献数
- 1
シロトキコウ<i>Ibis cinereus</i>はジャワ•スマトラ•東マレーシア•カンボジア•ヴェトナム南部に分布するが,タイ国からは記録がなかった.国立シンガポール大学動物学部所蔵の鳥類標本中にタイ国産雄成鳥の標本(1930年8月19目タイ南部のSetulで採集)が1点あるので,この種をタイ国鳥類目録に追加する.マレー半島では,タイ•マレーシアの国境をほぼ境に,北部にインドトキコウ<i>Ibis leucocephalus</i>が,南部にシロトキコウが分布するが,両種とも個体数が近年著しく減少している.今回報告した標本は,マレー半島におけるシロトキコウの北限にあたると考えられるので,貴重なものであろう.
1 0 0 0 鳥類の属の和名について
- 著者
- 森岡 弘之
- 出版者
- 日本鳥学会
- 雑誌
- 日本鳥学会誌 (ISSN:0913400X)
- 巻号頁・発行日
- vol.37, no.3, pp.p149-150, 1989-03
