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Foreign uncooked food of Yokohama

Last update date March 20, 2019

Foreign uncooked food of Yokohama

Though originally I was not in the area, with "foreign uncooked food" (naturalized species), we say living thing which entered at other areas by human activity. Including thing which attached to thing and ship which was brought in as pet, and became the wild, and has been carried to Yokohama originally habitation, creature which did not grow are frequent in Yokohama. Lower figure showed the number of the types of naturalized species and the ratio among living things (fish, benthos, adhesion algae) confirmed by biota investigation in river. Tendency to increase includes the number of the types of living thing of river in the whole with improvement of water regime, but ratio of naturalized species has been gradually increasing, and biological diversity which seems to be Yokohama is lost.

Graph of ratio of the number of the types and the number of the types of naturalized species of naturalized species for all types

Outpatient department living thing which is seen in the city

Innumerable outpatient department living things inhabit the city and grow, but introduce some of those.

Kurihara squirrel (Taiwan squirrel)
It inhabits around the southern part of city and is extending distribution. We tear off the bark, and there is damage such as biting telephone wire.

Crested myna
Friend of gray starling seen around the southern part of city. It was created to porcelain and painting on a folding screen and wall in the Edo era, but originally did not inhabit Yokohama.

Butterfly which it is done hocho artificially, and is escalating distribution. We are seen now in whole city.

Kava Gobius similis
Friend of goby distributed over West Japan. Originally do not live in Yokohama, domestic naturalized species.

Some naturalized species become a target of prevention as ecosystem, human life, body, thing giving damage to agriculture, forestry and fisheries industry or thing which might give, but it is difficult to let the outdoors exterminate naturalized species which has spread and needs great labor once.
"We do not open" "we do not throw away", but "we cannot enter" is principle with naturalized species very much to connect biological diversity like Yokohama in history.

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Environmental Planning Bureau policy coordination department environmental science research institute

Telephone: 045-453-2550

Telephone: 045-453-2550

Fax: 045-453-2560

E-Mail address [email protected]

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