Japanese Journal of Ornithology
Online ISSN : 1881-9710
Print ISSN : 0913-400X
ISSN-L : 0913-400X
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Volume 67, Issue 2
Displaying 1-10 of 10 articles from this issue
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ARTICLE
  • Foraging behaviour of Teal Anas crecca in relation to numbers of individuals and water levels
    Takashi UEDE
    2018 Volume 67 Issue 2 Pages 217-226
    Published: October 25, 2018
    Released on J-STAGE: November 14, 2018
    DOIhttps://doi.org/10.3838/jjo.67.217
    JOURNAL FREE ACCESS
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    Observations in central Wakayama Prefecture revealed the effect of number of individuals and water level on the diversity of foraging behaviour of Teal Anas crecca. Wintering numbers peaked during October and November and again during March and April. The most frequent foraging behaviour was dabbling or dipping in 4-17 cm deep water. However, foraging on shore or in water deeper than 24 cm was observed during the periods of peak numbers. Comparing the diversity index H’ of foraging behaviour and number of individuals, H’ during the low density period was significantly lower than that during the high density period. This shows that Teal begin to forage in less usual places and using unusual methods, following an increase in the number of individuals. In contrast, the effect of water level on H’ was significantly weaker than the number of individuals. This effect was considered to be the result of temporary increases in water level, following precipitation. In conclusion, the study revealed that Teal begin to forage on shore or in water deeper than 24 cm when the number of individuals increased, though foraging by dabbling and dipping in 4-17 cm of water was common, leading to high diversity in foraging behaviour.
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  • Annual variation in the avifauna during succession of a forest gap, studied using sound recorders
    Soichi SHIRAI
    2018 Volume 67 Issue 2 Pages 227-235
    Published: October 25, 2018
    Released on J-STAGE: November 14, 2018
    DOIhttps://doi.org/10.3838/jjo.67.227
    JOURNAL OPEN ACCESS
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    Following the destruction of parts of a coniferous plantation in Takao-kogesawa national forest, Tokyo, during a natural disaster, we have attempted to replant the habitat “gaps” with deciduous broad-leaved trees since 2001. Sound recorders were used to study the appearance of birds in these habitat gaps during the process of succession. Ten resident species bred in the regenerating gaps from 2006 to 2015. Brown-eared Bulbuls and Japanese Bush Warblers were recorded more frequently, whereas other species, such as Meadow Buntings, that do not prefer forest, showed no obvious change over the decade.
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  • Eurasian Tree Sparrow nests observed in old buildings in Hakodate, Hokkaido
    Rika KUDO, Kenta AMANO, Yuna NAKAGAWA, Osamu K. MIKAMI
    2018 Volume 67 Issue 2 Pages 237-242
    Published: October 25, 2018
    Released on J-STAGE: November 14, 2018
    DOIhttps://doi.org/10.3838/jjo.67.237
    JOURNAL FREE ACCESS
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    In Japan, the Eurasian Tree Sparrow, Passer montanus, is common in urban areas and nests in artificial structures. Though frequently described as nesting in old buildings, little has been reported on this behaviour. We estimated the age of buildings and examined whether sparrows were nesting in them or not. We frequently observed sparrows nesting in older buildings and found that they often used spaces in air vents as nest sites.
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  • Nut-dropping behavior of Carrion Crows in Hakodate City, Hokkaido
    Kanami ARA, Katsura MIKAMI, Osamu K. MIKAMI
    2018 Volume 67 Issue 2 Pages 243-248
    Published: October 25, 2018
    Released on J-STAGE: November 14, 2018
    DOIhttps://doi.org/10.3838/jjo.67.243
    JOURNAL FREE ACCESS
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    We observed the nut-dropping behavior of Carrion Crow Corvus corone from October to December 2016 in Hakodate, Hokkaido, Japan. Carrion Crows dropped two species of walnuts, mostly Juglans mandshurica, but occasionally also J. regia var. orientis. Nut-cracking behavior, using automobiles, was often observed at intersections rather than on straight roads, but nut-dropping behavior was observed equally at both. The average height from which crows dropped nuts was related to their success rate: higher drops led to more nuts being broken.
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