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Ecological Intelligence

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Ecological Intelligence / Subject

spiders

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 Latin America & Caribbean

Brazilian cave spiders push back on the idea that subterranean life always makes species more functionally alike

Evidence
Peer-reviewed
Geography
Minas Gerais and Bahia, Brazil
System
Caves / subterranean ecosystems

WHAT THE EVIDENCE SAYS

Researchers compared morphological traits associated with ecology, locomotion and sensory perception among surface, cave-associated and obligate-cave morphospecies in two spider families. Contrary to the classic expectation of functional convergence under strong subterranean filtering, troglobitic morphospecies showed the highest functional diversity and a non-significant but directionally consistent tendency toward trait overdispersion.

WHY IT MATTERS / OUR READ

Environmental filtering does not always produce functional sameness. Even extreme habitats can contain multiple adaptive trajectories, so conservation assessments based only on a generic ‘cave-adapted’ trait syndrome may miss niche differentiation among lineages.

CAVEATS / UNCERTAINTY

The analysis is limited to two spider families and trait-defined morphospecies from two Brazilian states. The overdispersion tendency was not itself statistically significant, and trait patterns are consistent with—but do not directly prove—competition, niche specialization or differential resource use.

SOURCE

Community Ecology — primary study
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Trait comparisons in Telemidae and Ochyroceratidae found greater functional variation among obligate cave morphospecies and a directionally consistent tendency toward overdispersion.

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