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Biological diversity of Yokohama

Last update date July 15, 2020

Biological diversity of Yokohama

In Yokohama-shi, forest place and farmland with unity are distributed over citizen's imminent place led by the suburbs part in spite of being big city having population (as of December 1, 2018) more than 3.7 million, and it features natural environments that are various from the topography which was rich on the sea and river, ups and downs that there remains. However, trend toward decreases has green coverage ratio of city limits and cuts 30% as of 2009.
Background, problems of crisis of biological diversity in Yokohama-shi include the following points.

  • The loss, fragmentation, aggravation of habitation, growth place by modifications of use of land accompanied with development
  • The dilapidation of habitation, growth environment of creature by appropriate management not being perfect
  • Lack of general accumulation of living thing survey data
  • Change of lifestyle and consciousness by improvement of convenience of life
  • Lack of approach in consideration for biological diversity

In big city Yokohama, we communalize these backgrounds, problems with citizen's all of you while importance of biological diversity attracts attention worldwide, and it is necessary to connect biological diversity which seems to be rich Yokohama in history.

Foreign uncooked food of Yokohama

Though originally I was not in the area, with "foreign uncooked food" (naturalized species), we say creature which entered at other areas by human activity. Including thing which attached to thing, ship which was brought in as pet, and became the wild, and has been carried originally habitation, creature which did not grow are frequent in Yokohama.
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.

Approach about biological diversity in environmental science research institute

The city biota investigation

In Yokohama-shi, we performed some living thing habitation situation investigation led by environmental science research institute. Particularly, about river and the sea in the city, we carry out investigation every about three years from 1973. About result or report, please see page of environmental data.

River area

We investigate fish, benthos, waterweed, adhesion algae about 6 water systems of river flowing through the city and are doing water regime evaluation of river from creature.
We carried out every about three years from 1973 and carried out the thirteenth investigation in 2011.

Sea area


We carry out investigation into fish, shore animal, seaweed, seaweed, plankton in the river mouth, the shore, bay in the city and evaluate water regime of the sea from creature.
We investigated the 14th in 2016, 2017.

The source area, pond

We performed the source area water regime basics investigation from 2004 to 2008 to inflect for maintenance reproduction of the source area and environmental activity targeting at main river riverhead basin of Yokohama and the neighboring areas.
In addition, we carried out biota investigation in four ponds in the city and one education rice field in 2010.

The land area

In Yokohama-shi, we carried out biota, ecosystem investigation of the Yokohama-shi land area in 1997 and 1998 in 1990 from 1986 and investigated afterwards in the area that the source area or park limited.
From 2012, we carry out biota investigation (plant, mammals, birds, reptiles, amphibians, Insecta) of the land area based on biological diversity Yokohama action plan (b plan) in the "green 10 University base" "outskirts of green 10 University base" "city area that urbanization goes ahead" through.

Biota investigation point of the land area
Basin Investigation point
Vast Okagawa basin Hitorizawa Shimin-no-Mori, Kuraki Park, Yokohama Park , Yamashita Park
The Tsurumi River basin Shinji Shimin-no-Mori, Shin-Yokohama Park, Shishigaya Shimin-no-Mori
Katabira River basin Kodomo Natural Park, Jingashita Keikoku Park, Nogeyama Park
The Sakai River basin setanimujinakubokoen, Four Devas Moriizumi Park, Maioka Park

Investigation by primary schoolchild

We have citizen raise interest in local nature and creature at environmental science research institute and, for the purpose of acquiring the basics data to contribute to biological diversity maintenance, carry out creature investigation by primary schoolchild in whole Yokohama-shi from 2013.

Accumulation, exhibition of living thing data

In Yokohama-shi, we perform investigation about the living thing habitation situation in department except environmental science research institute. We accumulate state of implementation of those investigations and living thing habitation information and perform public (partly) of data.

Issuance of pamphlets

Result of biota investigation is released with findings report and findings summary version, but it is easy to get close more and sells pamphlet as thing having you deepen interest in environment at making, municipal administration publication, goods sale corner (the third floor of the city hall).

  • [creature series 9 of river and the sea] "Creatures of waterside of Yokohama Tando" 2008 issuance
  • [creature series 8 of river and the sea] "It is creature cho beyoyokohamano river" 2005 issuance
  • [creature series 7 of river and the sea] "Plants of waterside of Yokohama" 2005 issuance
  • [creature series 6 of river and the sea] "Creatures of the shore of Yokohama" 2002 issuance

In addition, it was such photograph and living and introduced birds seen in Yokohama and made leaflet about findings of bird-watching place and research institute in the city.

Reflection to measure

It is very important that we grasp the current situation and change of the living thing habitation situation in the city on performing measure in consideration for biological diversity.
At environmental science research institute, we contribute to various plans about biological diversity and development of guideline through analysis of findings or examination of environmental ecosystemic evaluation method.

Evaluation of water regime by example 1 biological indicator

We set indicator organism based on accumulation data of research institute about aquatic and evaluate water regime.

  • Memoir about area of the sea biological indicator
  • Report about river biological indicator revision

Qualitative evaluations such as example 2 greenery

We arranged technical requirements about the making of greenery in consideration for biological diversity and evaluated imminent natural environments by ecosystem healthy degree simple rating systems that we developed newly and announced in the second "green technique forum 2008" (May, 2008).

Plan, guideline to affect biological diversity

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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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