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Post by sebbe67 on May 7, 2005 12:01:48 GMT
Cettia diphone restricta
last observed ca. 1942 on Daito Islands, island brush-dwelling insectivore endemic to Daito Islands, Japan, disappeared after devegetation for military airfields by Japanese garrison during World War II
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Post by sebbe67 on Dec 20, 2005 16:52:34 GMT
The taxonomy of Japanese Bush Warbler (Cettia diphone) is very confused in Japan at the moment. It is said that 4 subspecies (not including borealis) live in Japan. They are the races sakhalinensis, cantans, diphone, and riukiuensis. Another subspecies, restricta (Japanese name is Daito-Uguisu) once lived on Minami-Daito Island, but it has been considered extinct since 1920 (OSJ 2000).
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Post by sebbe67 on Dec 20, 2005 16:53:48 GMT
Recent research on Okinawa Island has shown two distinct plumage forms ( Kajita et al. 2002). One form is characterized by having deep rusty upper parts, while the other has grayish olive upper parts. The former (the brown form) is resident on Okinawa, and measurements and plumage characteristics comform with race restricta, which means that the extinct race resricta has been rediscovered.
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Post by Melanie on Feb 14, 2009 19:57:27 GMT
Cettia diphone restricta
extinct subspecies of the Japanese Bush Warbler, last seen 1927.
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Post by Melanie on Feb 14, 2009 20:00:19 GMT
Two Forms of Bush Warbler Cettia diphone Occur on Okinawajima Island: Re-evaluation of C.d. riukiuensis and C.d. restricta by Multivariate Analyses. Accession number;02A0489677 Title;Two Forms of Bush Warbler Cettia diphone Occur on Okinawajima Island: Re-evaluation of C.d. riukiuensis and C.d. restricta by Multivariate Analyses. Author;KAJITA MANABU(Kyodai Daigakuinri Rigakukenkyuka) MANO TOORU(Kankyokagaku) SATO FUMIO(Yamashina Inst. Ornithology) Journal Title;Journal of the Yamashina Institute for Ornithology Journal Code:Z0691A ISSN:0044-0183 VOL.33;NO.2;PAGE.148-167(2002) Figure&Table&Reference;FIG.5, TBL.9, REF.37 Pub. Country;Japan Language;Japanese Abstract;It has long been believed that the Ryukyu Bush Warbler Cettia diphone riukiuensis(Kuroda, 1925) is resident and the only subspecies distributed in Ryukyu Archipelago, Japan. However, we found that Bush Warblers on Okinawajima occur in two distinct plumage forms. One form, the brown form, is characterized by having deep rusty brown upper parts, while the other, gray form, has grayish olive upper parts. Our investigations, using mist-nets to trap birds clarified that the brown form is resident and that the gray form winters on the Island. Univariate analysis of 13 measurements taken of the birds, revealed significant morphological differences of the two forms. Likewise, multivariate analysis differentiated the brown form from the gray form. The type series of C.d. riukiuensis(14 specimens, already lost) were identified as being of the gray form by using a linear discriminant function obtained from 4 measurements from the two forms. The measurements and plumage characteristics in the original description of C.d. riukiuensis conform with the gray form. These results indicate that the gray form should be ascribed to C.d. riukiuensis. It has become clear that C.d. riukiuensis is a wintering bird, not a resident on Okinawajima. The measurements and plumage characteristics of the brown form conform with the original description of the Borodino Bush Warbler C.d. restricta(Kuroda, 1923). The type series of C.d. restricta(2 specimens, already lost) were identified as being the same as the brown form by using linear discriminant function. These results indicate that the brown form should be attributed to C.d. restricta. C.d. restricta has been regarded as an extinct, endemic subspecies that occurred only on Minami-Daitojima Island. Our results suggest, however, that C.d. restricta is not extinct and that it inhabits on Okinawajima. (author abst.) sciencelinks.jp/j-east/article/200215/000020021502A0489677.phpStill regarded as extinct by HBW 11 (2006) |
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Post by sebbe67 on Feb 16, 2009 9:52:56 GMT
Two Forms of Bush Warbler Cettia diphone Occur on Okinawajima Island: Re-evaluation of C.d. riukiuensis and C.d. restricta by Multivariate Analyses. Accession number;02A0489677 Title;Two Forms of Bush Warbler Cettia diphone Occur on Okinawajima Island: Re-evaluation of C.d. riukiuensis and C.d. restricta by Multivariate Analyses. Author;KAJITA MANABU(Kyodai Daigakuinri Rigakukenkyuka) MANO TOORU(Kankyokagaku) SATO FUMIO(Yamashina Inst. Ornithology) Journal Title;Journal of the Yamashina Institute for Ornithology Journal Code:Z0691A ISSN:0044-0183 VOL.33;NO.2;PAGE.148-167(2002) Figure&Table&Reference;FIG.5, TBL.9, REF.37 Pub. Country;Japan Language;Japanese Abstract;It has long been believed that the Ryukyu Bush Warbler Cettia diphone riukiuensis(Kuroda, 1925) is resident and the only subspecies distributed in Ryukyu Archipelago, Japan. However, we found that Bush Warblers on Okinawajima occur in two distinct plumage forms. One form, the brown form, is characterized by having deep rusty brown upper parts, while the other, gray form, has grayish olive upper parts. Our investigations, using mist-nets to trap birds clarified that the brown form is resident and that the gray form winters on the Island. Univariate analysis of 13 measurements taken of the birds, revealed significant morphological differences of the two forms. Likewise, multivariate analysis differentiated the brown form from the gray form. The type series of C.d. riukiuensis(14 specimens, already lost) were identified as being of the gray form by using a linear discriminant function obtained from 4 measurements from the two forms. The measurements and plumage characteristics in the original description of C.d. riukiuensis conform with the gray form. These results indicate that the gray form should be ascribed to C.d. riukiuensis. It has become clear that C.d. riukiuensis is a wintering bird, not a resident on Okinawajima. The measurements and plumage characteristics of the brown form conform with the original description of the Borodino Bush Warbler C.d. restricta(Kuroda, 1923). The type series of C.d. restricta(2 specimens, already lost) were identified as being the same as the brown form by using linear discriminant function. These results indicate that the brown form should be attributed to C.d. restricta. C.d. restricta has been regarded as an extinct, endemic subspecies that occurred only on Minami-Daitojima Island. Our results suggest, however, that C.d. restricta is not extinct and that it inhabits on Okinawajima. (author abst.) sciencelinks.jp/j-east/article/200215/000020021502A0489677.phpStill regarded as extinct by HBW 11 (2006) Yeah but as said before, HBW isnt the ultimate source of information. If there is one for birds its the Clement list that should be followed. |
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Post by another specialist on Apr 23, 2009 8:22:01 GMT
November 9, 2004: Nial Moores At present the OBC checklist (http://orientalbirdclub.org/publications/checklist/obcchecklist.txt) suprisingly calls Cettia diphone "Oriental Bush Warbler" (perhaps not really fitting taxa that very largely nest outside the true Oriental region ). Their list does not go to the level of subspecies, and as it does not include either borealis or canturians as separate species, it can be assumed that all three are considered part of Oriental Bush. If, however, all of these Cettia (or Horeites!) warblers are to receive 'good' English names, and if appropriate, alternative historical names do not yet exist for them, then perhaps "Japanese" and "Korean Bush Warblers" might well be acceptable to most birders for cantans and borealis respectively? For birders in Korea, the name "Korean Bush Warbler" would likely be very warmly welcomed: consider how many species are prefixed with Chinese, such as Grey Shrike, Egret and Grosbeak, etc; and most especially by Japanese, from white-eyes to woodpigeons, cranes to thrushes, bush warblers to skylarks, and as yet no Korean anything! If country names are to be avoided in bird names, in light of political sensibilities as well as to better reflect true distributions, a decent alternative for borealis might instead be Boreal or Northern Bush Warbler, while canturians could perhaps become Canturian Bush Warbler or instead Large or even Great Bush Warbler (both names still not yet taken it seems). For further complication, I would also like to check with Kantorians: is it true that the type specimen of Cettia diphone is actually one of the extraordinary long-billed island taxon (from Tokyo Bay?) that is not even found on the mainland of Japan? If so, Japanese Bush Warbler (or whatever it might be called) would also perhaps need to lose "diphone" and receive again a new "simple" ('Kantan') scientific name as well: Cettia cantans. November 10, 2004: Yoshiki Watabe The taxonomy of Japanese Bush Warbler (Cettia diphone) is very confused in Japan at the moment. It is said that 4 subspecies (not including borealis) live in Japan. They are the races sakhalinensis, cantans, diphone, and riukiuensis. Another subspecies, restricta (Japanese name is Daito-Uguisu) once lived on Minami-Daito Island, but it has been considered extinct since 1920 (OSJ 2000). Korea was under the Japanese Mandate before the end of the Second World War; therefore the race borealis was included in the list of Japanese species (Hachisuka et al. 1932). But after the war, borealis was no longer included among Japanese birds. Sakhalinensis is paler and grayer than cantans (Yamashina 1941). As mentioned below, it migrates to Okinawajima, so it may be seen on Honshu and Kyushu. I looked for cantans and sakhalinensis on Hegura-jima this November, and I saw both a brownish one and grayish one, but I do not know whether this difference was caused by race or age or light conditions. On the other hand, race ijimae (on Izu-shichi-to and Tanega-shima), race panafidinicus (on Tori-shima) and race iwootoensis (in Kita-Iwo-to and Naka-Iwo-to) were once recognized as subspecies of Japanese Bush Warbler, but they are no longer recognized by OSJ(2000). If you want a summary of their taxonomy and distribution, you may read Check-list of Japanese Birds 6th revised edition (OSJ 2000) . It is written in English and Japanese. However, its description is partially wrong (see below). Recent research on Okinawa Island has shown two distinct plumage forms ( Kajita et al. 2002). One form is characterized by having deep rusty upper parts, while the other has grayish olive upper parts. The former (the brown form) is resident on Okinawa, and measurements and plumage characteristics comform with race restricta, which means that the extinct race resricta has been rediscovered. The latter (the gray form) was identified as race riukiensis. It is a wintering bird, not a resident, on Okinawa. Perhaps race riukiensis and race sakhalinensis are synonymous. In that case, sakhalinensis will be an invalid name, because riukiensis has priority.
As mentioned above, it was said that restricta was once distributed on Minami-daito-jima. Last year, breeding of Japanese Bush Warbler was discovered on the island again, but it was not any known race, including restricta. Its taxonomic status is unknown, but its plumage colour and mt-DNA was similar to cantans, and measurements conform with the population onNakano-shima ( in Tokara-retto, southwest Kyushu) . The subspecific name of the population of Nakano-shima is unknown.ca.geocities.com/kantorilode/Species/JBWarbler.html |
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Post by koeiyabe on Apr 24, 2015 1:47:55 GMT
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