Japanese Journal of Ornithology
Online ISSN : 1881-9710
Print ISSN : 0913-400X
ISSN-L : 0913-400X
Volume 52, Issue 1
Displaying 1-7 of 7 articles from this issue
  • Kiyoshi IMAI
    2003 Volume 52 Issue 1 Pages 1-12
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    Domestic fowl, Gallus gallus domesticus, is the most important poultry (domesticated birds that serve as a source of egg or meat to human beings) in the world. The process of egg production in the female bird is composed of follicular rapid growth in the ovary, ovulation of the largest follicle, egg formation in the oviduct and oviposition. In the present review, the ovipository pattern, the egg producing process and its physiological regulation, especially endocrine control, in the hen are described. The period required to follicular rapid growth is 8days with a highest frequency, ranging from 7to 10days in almost all the follicles examined. Ovulation of the largest follicle in the ovary is mainly controlled by pituitary LH and follicular progesterone. Egg formation, being constituted by egg white, shell membrane and egg shell surrounding yolk, is conducted in the oviduct during about 24hours. Vasotocin and prostaglandins play an important role participating in oviposition.
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  • Akira KOIWAI
    2003 Volume 52 Issue 1 Pages 13-23
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    The overlap of home ranges, copulation and mate guarding behaviour were studied in socially monogamous Black-faced Buntings Emberiza spodocephala from April to July in 1992at Sugadaira (36°32′N, 138°20′E, 1, 250 m alt). Each male bunting had a stable home range and a song area within that. Since males frequently intruded into neighbouring home ranges to seek extra-pair copulations, the home ranges overlapped greatly. Song areas also overlapped with each other. Once males acquired mates, they did not sing frequently. These suggest that males did not maintain the song area as a territory after pair formation. Males guarded their mates by spending much time near their mates and by following them closely. The shortness of intra-pair distance and the percentage of flights in which the female was followed by her mate peaked during the presumed fertile period. Males started mate guarding soon after pair formation. All 29intra-pair copulations were observed during the fertile period. Aggressive behaviors between males due to attempts of extra-pair copulation were observed between pair formation and the fertile period. The half of 10extra-pair copulations were observed during the fertile period. It means that males could not defend their mates completely. These results suggest that male Blackfaced Buntings guard their mates rather than exclusive areas, while they seek opportunities to attempt extra-pair copulations. Black-faced Buntings live in the brushy and visually occluded habitats. These habitats would prevent males from performing mate guarding and territorial defence simultaneously. Males responded aggressively to extra-pair male intrusions which started and continued after pair formation and took part in incubation. Male-biased sex ratio in this area also makes males to give priority to mate guarding over territorial defence to assure their paternity.
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  • Masahiro FUJIOKA
    2003 Volume 52 Issue 1 Pages 24-28
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
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  • Satoshi KAWAGUCHI, Takahito YAMAMOTO
    2003 Volume 52 Issue 1 Pages 29-31
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    Sixty seven pellets of Long-eared Owls, Asio otus, were collected in a village, Ehime Prefecture, during 19February 2001to 6 April 2001. The bones of 164 Mus musculus, ten Micromys minutus, two Apodemus speciosus, two Rattus sp., seventeen Pipistrellus abramus, two Myotis macrodactylus, twelve Crocidura dsinezumi and a bird were found in the pellets. M. minutus, P. abramus, M. macrodactylus and C. dsinezumi were new records in diet of the Long-eared owls.
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  • Tetsuo SHIMADA
    2003 Volume 52 Issue 1 Pages 32-34
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    Distribution of feeding sites of wintering Greater White-fronted Geese Anser albifrons around Lake Izunuma-Uchinuma (roost) was determined by direct observations during winter of 1997, 1998and 1999. The 68.6% of 110feeding flocks were observed in rice fields within 6km from the lake.
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  • Tomohiro DEGUCHI, Tatsuhiko KAGAMI
    2003 Volume 52 Issue 1 Pages 35-38
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    Daily measurement of chick mass could be a useful method to estimate daily food intake under the assumption that the effects of the body mass on daily mass increment do not differ between chicks receiving different amount of food. To evaluate this assumption, 40g and 60g anchovy per day were fed to Rhinoceros Auklets chicks in semi-captivity. Negative relationships between chick mass and daily mass increment were found in 40g-and 60g-fed chicks. There was no significant difference in the slope of regression equation between 40g-fed chicks (-0.037±0.018) and 60g-fed chicks (-0.041±0.016). The intercept in 60g fed chicks (17.578±3.491g) was larger than that in 40g fed chicks (10.950±3.491g). Therefore, the daily amounts of food intake in Rhinoceros Auklet chicks can be estimated from body mass and daily mass increment.
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  • Tomoo YOSHINO, Kazuto KAWAKAMI, Hitoshi SASAKI, Kenji MIYAMOTO, Mitsuh ...
    2003 Volume 52 Issue 1 Pages 39-42
    Published: 2003
    Released on J-STAGE: September 28, 2007
    JOURNAL FREE ACCESS
    As one of ecological surveys of alien avian species in Japan, internal and external parasites of 4 individuals of Hwamei Garrulax canorus and 4 individuals of Red-billed Leiothrix Leiothrix lutea collected in Kanagawa, Tokyo, and Fukuoka Prefs., Japan during from July 1999to November 2001, were investigated. Ornithoica bistativa, Ornithomya avicularia cf. aobatoensis, Haemaphysalis flava and Centrorhynchus turdi were obtained from Hwamei, and Ornithonyssus sylvialum and Anonchotaenia sp, were obtained from the Leiothrixes, respectively. All of these external parasites and the acanthocephalan species are newly recorded from these two avian species in Japan.
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