Regenerating 100-Hectare Forest in Mt. Fuji

by OISCA International
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji
Regenerating 100-Hectare Forest in Mt. Fuji

Project Report | Apr 28, 2026
Evaluating Our Impact on Local Wildlife (Part 2)

By Karo Anna | Project Coordinator

Japanese warbler enjoying sakura
Japanese warbler enjoying sakura

Dear supporters of the Mt. Fuji Project,

 

We are always heartfully grateful for your generosity and warm support.

Today is Part 2 of our bush warbler survey series. Last time, we talked about:

-       bush warblers’ significance in Japan

-       how surveys, supported through your donations, are conducted

 

This time, we want to share our early findings.

Every year, we survey 10 locations (see attached map), counting the number of birds and collecting data at each one of them. Our 6-years data revealed a striking contrast: the number of birds stayed low at Location 2, and high at Location 9 (marked red on the map). Our experts have the following hypothesis regarding this:

Location 2 is basically an open space with many fallen trees and low vegetation (no more than a few cm long). Meanwhile, Location 9 is a thicket full of high-growing plants and rich understory. It is such dense thickets that are bush warbler’s natural habitat, providing foraging, protection from predators and shelter from harsh weather.

Our specialists suspect that Location 2 has been heavily impacted by deer. Naturally, Mt. Fuji features rich and dense vegetation; however, the deer feed off those plants, leaving the area bare. At Location 9 – home for most birds on our site – the conditions are closest to Fuji’s authentic environment. While we need more data to draw final conclusions, it is safe to say now that bush warblers thrive most in Fuji’s authentic conditions. Therefore, preserving natural environment is critical for local biodiversity.

Biodiversity surveys provide an important insight into our project’s impact. To understand the changes we are making and improve our initiatives going forward, we need to focus not only on tree growth, but also other criteria. Hence, our Project Team is committed to continue such surveys and gather more data in the next years.

We hope for your continuous support, and will make sure to keep you updated regarding the shared impact we are making

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Mar 11, 2026
Evaluating Project's Impact on Local Wildlife

By Karo Anna | Project Coordinator

Jan 26, 2026
From 20 Years of Experience to the Next Phase

By Kosei Sugawara | Project Manager

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Organization Information

OISCA International

Location: Suginami-ku, Tokyo - Japan
Facebook: Facebook Page
Project Leader:
Ma. Grazen Acerit
Suginami-ku , Tokyo Japan
$9,908 raised of $20,000 goal
 
240 donations
$10,092 to go
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