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Ecological Intelligence

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Ecological Intelligence / Subject

disturbance

Peer-reviewed North America

A caribou's loyalty to home can become a liability after disturbance

Evidence
Peer-reviewed
Geography
Canadian boreal forest
System
Boreal forest / caribou home ranges / fire and harvest

WHAT THE EVIDENCE SAYS

GPS records from 331 boreal caribou across 667,000 square kilometres show that fidelity to familiar low-disturbance ranges was associated with lower mortality. Remaining faithful to severely disturbed ranges, especially regenerating harvest areas, was instead associated with increased mortality; recent forest disturbance also prompted range shifts.

WHY IT MATTERS / OUR READ

Conservation needs to consider the possibility that past habitat familiarity can become a liability. A caribou range remains mapped as occupied even while its function as a safe home deteriorates; connected refuges matter alongside static protection maps.

CAVEATS / UNCERTAINTY

An observational survival and telemetry analysis cannot establish every mortality mechanism or prove that inducing dispersal improves survival.

SOURCE

Landscape Ecology — caribou telemetry research (2026)
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Tracking 331 boreal caribou links site fidelity with survival—but the direction depends on forest disturbance.

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Peer-reviewed North America

After wildfire, different carbon tracers leave watersheds on different clocks

Evidence
Peer-reviewed
Geography
CZU Lightning Complex watersheds, coastal California, USA
System
Post-fire headwater watersheds

WHAT THE EVIDENCE SAYS

Monitoring after the 2020 CZU fires found levoglucosan concentrations peaking in the earliest post-fire flows and then declining, while black-carbon transport tracked discharge more strongly and increased in relative importance with time since fire. The two tracers therefore represented different mobilization pathways after the same disturbance.

WHY IT MATTERS / OUR READ

Post-fire water-quality monitoring can miss process if all pyrogenic carbon is treated as one pool. Sampling timing and hydrologic context determine which fire signal is visible.

CAVEATS / UNCERTAINTY

The study covers five small coastal California watersheds and two carbon tracers, not the complete watershed carbon budget. Transport behavior may differ with geology, burn severity, storm regime and channel structure.

SOURCE

Biogeochemistry — primary field study
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Five California coastal watersheds showed an early pulse of fire-derived levoglucosan while black-carbon export was more discharge-driven and became more prominent later.

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North America

An 18-year stream experiment makes maintenance central to restoration

Evidence
Peer-reviewed long-term controlled experiment
Geography
Asotin Creek, Washington, USA
System
Headwater streams / floodplain geomorphology

WHAT THE EVIDENCE SAYS

Across three tributaries, crews installed 654 large-wood structures, then added maintenance wood and adaptive beaver analogues. Channel bar and pool areas and side channels expanded with flood, fire and later treatments.

WHY IT MATTERS / OUR READ

Installation counts are not outcomes. Riverscape interventions require follow-up, sediment and wood recruitment, and allowance for major disturbance events.

CAVEATS / UNCERTAINTY

This measures geomorphic and connectivity change, not a demonstrated proportional fish-population gain; it reflects a particular watershed.

SOURCE

Frontiers in Ecology and Evolution · 18-year field study
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Large wood additions changed channel shape, but managers had to replenish and adapt to connect floodplains.

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Peer-reviewed Global

Negative vegetation extremes are covering more land—even though event frequency is not rising as clearly

Evidence
Peer-reviewed
Geography
Global terrestrial ecosystems
System
Terrestrial vegetation

WHAT THE EVIDENCE SAYS

An event-based analysis of global leaf-area-index data from 2001–2024 found extreme negative vegetation-growth events showed a significant increase in affected area of about 394,471 km² per year (p=0.04), reaching 39% of global land area in 2024. Event frequency also trended upward by 0.07% per year, but that trend was not statistically significant (p=0.13). Drought alone and drought compounded with heat or wildfire coincided with roughly 58.5–59.8% of events. High-emissions projections suggest substantially wider future exposure.

WHY IT MATTERS / OUR READ

The split between area and frequency matters: ecological stress can become more spatially extensive without a clean increase in how often events are counted. Tracking only event counts would miss that expansion.

CAVEATS / UNCERTAINTY

Leaf-area-index anomalies are remotely sensed vegetation responses, not direct measures of mortality, biodiversity loss or carbon flux. Coincidence with drought-related compound events does not by itself establish event-level causation, and future projections depend on scenario and model assumptions.

SOURCE

Global Change Biology — primary study
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Global LAI data show the affected area of extreme negative vegetation events increased significantly from 2001–2024, while the frequency trend was weaker and not statistically significant.

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Peer-reviewed North America

Fuel treatments reduced high-severity fire in one western landscape—and were largely masked in another

Evidence
Peer-reviewed
Geography
Southern Oregon and northern California, USA
System
Fire-prone conifer forests

WHAT THE EVIDENCE SAYS

Across 50 wildfires from 2012–2021, treated areas in the eastern landscape had significantly lower modeled high-severity probability than untreated areas; treatments less than nine years old and thinning followed by prescribed fire performed especially well. In the western landscape, large fire-spread days dominated severity and treatment types were not significantly different from untreated areas.

WHY IT MATTERS / OUR READ

The result is a useful brake on universal treatment claims: treatment effectiveness is conditional on landscape setting, weather and treatment age.

CAVEATS / UNCERTAINTY

This is an observational landscape analysis of federal treatment records and fires in two ecoregional settings. It estimates severity outcomes, not every ecological objective of fuel treatment, and cannot guarantee the same response elsewhere.

SOURCE

USDA Forest Service Research & Development
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Across 50 fires, treatment effects were strong in the drier eastern study landscape but not statistically distinct in the more productive western Klamath landscape.

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