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# Light and noise together were not consistently worse than their sum
- URL: https://intelligence.wildlandseco.com/2026-10-31-light-noise-pollution-no-consistent-synergy/
- Published: 2026-10-31T13:19:18.000Z
- Updated: 2026-10-31T13:19:18.000Z
- Description: A synthesis across taxa found harmful individual disturbance effects but no universal direction for their interaction.
- Author: Benjamin Worlund
- Tags: noise pollution, artificial light at night, meta analysis, urban wildlife, Wildlife, Cities, Methods, #ecological-intelligence, #brief-2026-10-31, #priority-read, #peer-reviewed, #geo-transregional

Evidence

Peer-reviewed

Geography

Thirty field/laboratory interaction studies across 13 countries

System

Ecological effects of anthropogenic light and noise

## WHAT THE EVIDENCE SAYS

A systematic search retrieved 6,018 records; 30 studies directly examined artificial light at night with anthropogenic noise, with 16 eligible for the interaction meta-analysis. The absolute departure from additivity was detectable, yet the pooled directional interaction was not significant. Both light and noise showed negative main effects, and responses varied among biological outcomes.

## WHY IT MATTERS / OUR READ

The design lesson is to examine multiple exposures together without assuming every co-exposure is synergistic. A null directional interaction does not excuse either pollutant; it warns against making a one-size-fits-all claim about their combination.

## CAVEATS / UNCERTAINTY

Only 16 papers entered the interaction meta-analysis, with geographic and taxa/outcome imbalance. A significant magnitude of nonadditivity does not imply a consistent worsening; communication outcomes differed from other outcomes, and study designs varied.

## SOURCE

Biodiversity and Conservation — 2026 meta-analysis  
[View original evidence ↗](https://doi.org/10.1007/s10531-026-03517-3?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-10-31

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-10-31/)