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Ecological Intelligence

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Ecological Intelligence / Subject

null findings

Peer-reviewed Asia

Disturbance did not produce the predicted arthropod functional split

Evidence
Peer-reviewed
Geography
West Bengal, India; tropical university-campus plots
System
Urban arthropod communities; disturbance; functional traits

WHAT THE EVIDENCE SAYS

A field comparison of butterfly and spider functional traits across ten plots in a West Bengal campus did not detect the expected strong between-disturbance functional separation. Reported multivariate tests were non-significant for butterflies (p = 0.413) and spiders (p = 0.886), despite environmental differences among plots.

WHY IT MATTERS / OUR READ

The counter-signal is a limit on inference, not a claim that urban disturbance is harmless. Trait responses can be filtered by sampling, timing, taxon and site history; negative results belong in the evidence used to design management.

CAVEATS / UNCERTAINTY

Small samples in one campus and non-significant tests do not demonstrate community equivalence or absence of any urbanization effect. Journal record was accepted in October 2026 with final typesetting pending.

SOURCE

Frontiers in Ecology and Evolution · West Bengal butterfly and spider study
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Butterflies and spiders on one Indian campus complicate a simple disturbance-diversity story.

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Peer-reviewed North America

After two decades of stream work, watershed-wide habitat signals were often missing

Evidence
Peer-reviewed
Geography
Western Washington, United States
System
Forest streams; salmonid habitat and restoration

WHAT THE EVIDENCE SAYS

From 2007–2024, investigators analyzed 4,421 habitat surveys from 269 sites across ten watersheds in three complexes, tracking wood, pools, gravel and channel geometry alongside varying restoration effort. Most expected whole-watershed directional shifts and treated-versus-reference differences did not emerge. Year-to-year and within-watershed variability were substantial.

WHY IT MATTERS / OUR READ

A single before-and-after snapshot cannot tell whether watershed restoration worked. Programs need repeated, spatially distributed measurements and a defined inference scale before investment can be assessed.

CAVEATS / UNCERTAINTY

Failure to detect a watershed-wide average habitat change is not proof that individual restoration projects had no local benefit or no salmon response. Some reference watersheds also experienced management; this paper assesses common habitat metrics, not every ecological objective.

SOURCE

Frontiers in Ecology and Evolution — primary long-term monitoring study
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Thousands of habitat surveys across ten Washington watersheds found interannual changes often larger than long-term trends or expected restoration contrasts.

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