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- SAITO Hitoshi
- 公益財団法人 日本野鳥の会
Bibliographic Information
- Other Title
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- カラスによるゴミの食い荒しの季節変動と曜日変動
- カラスによるゴミの食い荒らしの季節変動と曜日変動
- カラス ニ ヨル ゴミ ノ クイアラシ ノ キセツ ヘンドウ ト ヨウビ ヘンドウ
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Abstract
1 From May 2013 to July 2014 I surveyed the bus route from Kanazawa Hakkei to Sobu-zuido. From the bus window I recorded the scavenged garbage collection sites and also counted the number of crows nearby (Jungle crow Corvus macrorhynchos, Carrion crow Corvus corona).<br>2 I recorded the 3 types of garbage collection sites (exposed plastic bags, covered with nets, use of garbage containers). The results at the end of the surveyed showed that of 55 sites 0 (0%) were exposed plastic bags, 30 (53.6%) were covered with nets and 26 (46.4%) used garbage containers. I compared the type of garbage collection sites in Tokyo and Kawasaki in 2000 with the present study sites and concluded that the present study sites use a lot more nets and garbage containers.<br>3 Seasonal changes of scavenged garbage collection sites by crows and the number of crows to be similar with a decrease in the summer, increase in the winter and a sharp increase in the spring. I assume that due to both the change in diet and behavior of crows in the breeding and non-breeding season along with the amount and method of garbage disposal by residents has an influence.<br>4 I compared the weekly changes in the number of crows at the scavenged garbage collection sites. There was a tendency of scavenged garbage with a noticeable increase on burnable garbage days (Tues, Sat.). There was a gradual increase from Wednesday to Saturday. I then compare this with the day following burnable garbage days (Wed., Sun.) which showed an increase especially on Sundays. With these results it appears that the local residents do not follow the garbage pick-up time rules, especially on the weekend.
Journal
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- BINOS
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BINOS 21 (0), 1-6, 2014
Wild Bird Society of Japan Kanagawa Branch