Yokohama City More than 100,000 elementary school students in Yokohama have participated in the creature survey in the past 10 years!

Yokohama City
In the past 10 years, more than 100,000 elementary school students in Yokohama have participated in the creature survey!
-Results of the 2022 Children’s “Lively” Creature Survey-

The Environmental Science Research Institute is conducting a survey of elementary school students from 340 elementary schools in Yokohama, asking them to report on creatures they find near their homes or schools. In 2020, 10,552 elementary school students from 159 schools responded, showing a decrease in the confirmation rate of tree frogs, which are representative species of Satochi-satoyama environments, and the distribution of Kurihararisu (Taiwan squirrels), a specific alien species, in the city. We were able to obtain valuable information that will contribute to biodiversity conservation in the future, such as grasping the situation.
This survey has been conducted since 2013, and this is the 9th time in the 10th year, and the total number of participating children has exceeded 100,000.
[Image 1 【Purpose】
・To increase interest in local nature and creatures
・Acquire basic data that contributes to biodiversity conservation [Survey method]
Before the summer vacation of 2020, we distributed questionnaires to 29,003 5th graders (as of May 1, 2020) of 340 Yokohama municipal elementary schools, and found them “near home or school” in the past year. , I asked them to circle the creatures that heard their cry. [Creatures surveyed]
The nine types of creatures surveyed are changed every year, and while considering the ease of classification (identification) of the creatures, we selected those that characterize the natural environment in the city and those that are decreasing or increasing. bottom. 【Investigation result】
For each school, we aggregated the rate of finding the target creatures (hereinafter referred to as the confirmation rate), and based on that information, we displayed the high and low of the confirmation rate throughout the city with the shades of color. Among the 9 types of creatures, the confirmation rate of creatures representative of Satochi-satoyama, such as sawtooth stag beetles, tree frogs, and horsetails, was on a downward trend compared to the previous year’s survey. Changes in the natural environment in the city, and the effects of self-restraint and behavioral changes due to the corona wreck are conceivable.
More than 10,000 children participate in this survey every year, and the survey results are extremely accurate in understanding the biodiversity of Yokohama. Details of the results will be published as a report on the Yokohama City Environmental Science Research Institute website and distributed to all Yokohama municipal elementary schools. ・Tree frog: Confirmation rate of 37% in the city as a whole
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It is a creature representative of Satochi-satoyama environment and can be seen in paddy fields. In recent years, it is feared that it is declining as the paddy field environment is declining.
Areas with a high confirmation rate were the northwest and
southwestern areas, which almost coincided with the location of the paddy fields in the city.
The city-wide confirmation rate has significantly decreased from previous years (42% in both 2014 and 2018).
It is also possible that children’s relationship with nature has changed, such as the decrease in opportunities to experience rice farming due to the corona crisis.
・ Squirrel: City-wide confirmation rate of 41%
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The squirrels inhabiting the city are the non-native Kurihara squirrel (Taiwan squirrel), and the city-wide confirmation rate was 41%. Until the previous year’s survey, the confirmation rate of the entire city increased, suggesting changes such as the northward movement and expansion of the habitat range, but the results of this time are almost the same as the results of 2019, and the expansion of the habitat seems to be calming down. looks like Large rivers such as the Onda River and the Tsurumi River, which flow from west to east in the northern part of the city, may limit their habitat expansion. 【others】
The confirmation rate fluctuates depending on various factors, such as the accessibility of observation sites, and does not necessarily represent the population density of living things. It is important to analyze and consider the survey from a long-term perspective, and we plan to continue the survey from next year onward while changing the types of living things that are targeted.
Inquiries: Environmental Science Research Institute, Environmental Planning Bureau
TEL: 045-453-2550
Details about this release:


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