Yoshimaro Yamashina
Yamashina Institute for Ornithology
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Publication
Featured researches published by Yoshimaro Yamashina.
Caryologia | 1956
Sajiro Makino; Tatsuo Udagawa; Yoshimaro Yamashina
RIASSUNTOGli Aa. descrivono il cariotipo di Zenaidura macroura marginella e lo comparano criticamente con quello di altre cinque specie di Columbidae (Columba, Streptopelia, e Sphenurus). La somiglianza cariologica indica una forte affinita nelle relazioni tassonomiche di questi generi.
Journal of The Yamashina Institute for Ornithology | 1952
Yoshimaro Yamashina; Tatsuo Udagawa
The diploid number of chromosomes was determined as 80 (_??_2n) in the spermatogonial divisions. The macro-chromosomes include four pairs, being 8 in number. They have a formula consisting of aR+bv+cr+dr. The micro-chromosomes vary in size from small rods to spherulus and are 72 in number.There are found with indisputable clearness 40 bivalents in the primary spermatocyte metaphase plate. Two larger bivalents, probably descendants from the aR and bv elements of the diploid group, are remarkable for their conspicuous configuration.The karyotype as found in this species is quite unique in birds so far studied. In the related species, Charadrius dubius studied by Yamashina (1946), the following choromosome formula was given:Charadrius dubius 2Js+2Vs+2Rs+4vs+68rs _??_2n=78In comparison with the chromosomes of Arenalia interpres, there is no approach or similarity between the two species. Cyto-taxonomical consideration will be retained until further data can be accumulated.
Journal of The Yamashina Institute for Ornithology | 1952
Yoshimaro Yamashina
Mr. G. Okuyama in November, 1933 procured a swan on Hachijo Island, one of the Seven Islands of Izu and, it was identified by Mr. Tokutaro Momiyama (1939) as Cygnus cygnus (specimen no. 340033).I have recently exmined this specimen and found out that it is Cygnus olor, not C. cygnus as formerly considered it to be. This fact constitutes the first record of the Mute Swan found in the Japanese Islands.
Journal of The Yamashina Institute for Ornithology | 1981
Yoshimaro Yamashina; Toru Mano
Journal of The Yamashina Institute for Ornithology | 1978
Yoshimaro Yamashina
Journal of The Yamashina Institute for Ornithology | 1973
Yoshimaro Yamashina; Shiro Matsuyama
Journal of The Yamashina Institute for Ornithology | 1970
Yoshimaro Yamashina
Journal of The Yamashina Institute for Ornithology | 1962
Yoshimaro Yamashina
Journal of The Yamashina Institute for Ornithology | 1954
Yoshimaro Yamashina
Journal of The Yamashina Institute for Ornithology | 1977
Yoshimaro Yamashina