Skip to content
Ecological Intelligence

Ecological evidence.
Independent perspective.
Explore Wild Lands ↗

Ecological Intelligence / Subject

Japan

Peer-reviewed

A 211-site Japanese eDNA network shows how much coastal-fish monitoring changes when sampling gets frequent

Evidence
Peer-reviewed
Geography
Japanese Archipelago
System
Coastal marine fish communities

WHAT THE EVIDENCE SAYS

A high-frequency eDNA metabarcoding dataset used the MiFish primer set at 211 coastal sites across more than 3,000 km of the Japanese archipelago. From January 2018 to March 2019, 690 samples were collected using one-time, monthly and biweekly schedules and paired with environmental metadata. The dataset contains detections assigned to 1,477 fish species across 171 families and was designed to expose fine-scale temporal community variation.

WHY IT MATTERS / OUR READ

The contribution is the sampling architecture as much as the species list. Repeated eDNA sampling can show when a one-off biodiversity snapshot is likely to miss seasonal turnover and can provide a reusable benchmark for designing monitoring cadence.

CAVEATS / UNCERTAINTY

This is a data descriptor based on 2018–2019 sampling, not a demonstration that every detection represents local abundance or residency. eDNA results depend on transport, primer performance, reference libraries and sampling conditions, and temporal resolution is uneven among sites.

SOURCE

Scientific Data — primary dataset paper
View original evidence ↗

Six hundred ninety samples collected under one-time, monthly and biweekly schedules detected 1,477 fish species and preserved environmental metadata for resolving temporal community change.

Read the Wild Lands assessment →
Peer-reviewed

Long-term citizen science in Japan found decline signals that threat lists had not caught

Evidence
Peer-reviewed
Geography
Kanagawa Prefecture, Japan
System
Regional vascular-plant communities across satoyama, agricultural and urban landscapes

WHAT THE EVIDENCE SAYS

A Communications Biology study analyzed three citizen-led plant distribution surveys conducted in Kanagawa Prefecture across 1979–1987, 1996–2000 and 2013–2017. Among 1,864 native vascular plant species, the number of occupied survey districts declined for 835 species (44.8%), especially species associated with grasslands, forest edges, upland fields and wastelands; 688 species increased, including many evergreen-forest taxa. The authors also identified 53 species not currently listed as threatened whose disappearance rates were comparable to or greater than those of threatened species.

WHY IT MATTERS / OUR READ

Repeated regional surveys can reveal emerging conservation risk between formal threat-assessment cycles. The community shift also carries a land-use signal: declines in open and edge habitats alongside expansion of dark-forest specialists are consistent with ecological change following abandonment of traditional coppice management, not simply a single climate-pressure story.

CAVEATS / UNCERTAINTY

The analysis uses district-scale presence–absence records, not abundance estimates, and detectability or survey effort can vary through time. Associations with land-use abandonment are ecological interpretations supported by trait patterns, not experimental causal tests.

SOURCE

Communications Biology
View original evidence ↗

Across 1,864 native plants in Kanagawa, 44.8% lost recorded survey districts and 53 nominally non-threatened species declined at rates comparable to threatened taxa.

Read the Wild Lands assessment →
Peer-reviewed Asia

Japan — Forest symbioses are shifting with warming and tree disease

Evidence
Peer-reviewed
Geography
Japanese archipelago
System
Temperate forests and forest soils

WHAT THE EVIDENCE SAYS

Across more than 13,000 forest plots, arbuscular-mycorrhizal tree dominance increased significantly over roughly 15 years and was associated with climate warming and tree diseases. Higher AM dominance was negatively related to the soil carbon-to-nitrogen stock ratio.

WHY IT MATTERS / OUR READ

Forest change can reorganize belowground symbioses and nutrient cycling before those changes are obvious in simple canopy-cover metrics. Pest and disease dynamics may therefore alter biogeochemistry at broad scales.

CAVEATS / UNCERTAINTY

The observational design establishes broad associations rather than proving a single causal pathway from warming or disease to symbiosis shifts. Soil consequences will vary with species composition and site conditions.

SOURCE

Nature Communications · Original evidence
View original evidence ↗

More than 13,000 plots show increasing dominance of arbuscular-mycorrhizal trees, with potential consequences for soil nitrogen retention.

Read the Wild Lands assessment →

Keep exploring

Follow the systems. Find the connections.

WildlifeLandWaterOceansClimateCitiesOne HealthGovernanceMethods / Monitoring
Browse the archive →