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# Arid streams in a rainfall gradient produced more secondary biomass than wetter ones
- URL: https://intelligence.wildlandseco.com/2026-10-14-rainfall-gradient-stream-food-web-energy/
- Published: 2026-10-14T13:52:29.000Z
- Updated: 2026-10-14T13:52:29.000Z
- Description: Nine rivers tracked for three years shifted from detritivore-heavy food webs in wetter settings toward vertebrate herbivory in drier settings.
- Author: Benjamin Worlund
- Tags: stream food webs, rainfall, secondary production, Water, Wildlife, Climate, Food webs, #ecological-intelligence, #brief-2026-10-14, #global-radar, #peer-reviewed, #geo-transregional

Evidence

Peer-reviewed

Geography

Nine rivers across a natural precipitation gradient

System

Freshwater food webs; riverine secondary production

## WHAT THE EVIDENCE SAYS

Across nine rivers over three years, researchers compared invertebrate and vertebrate secondary production. Wetter streams had food-web energy concentrated in detritivorous invertebrates; arid streams showed more vertebrate herbivory and approximately twice the secondary production and biomass turnover.

## WHY IT MATTERS / OUR READ

A changing rainfall regime can reorganize an aquatic food web even when the river still appears to flow; production depends on which trophic pathways carry energy.

## CAVEATS / UNCERTAINTY

Site contrasts along a rainfall gradient are not a controlled climate-change experiment; geology, productivity and local biota may also differ. Reported production ratios are context-bound.

## SOURCE

Ecology — primary comparative multi-river study  
[View original evidence ↗](https://doi.org/10.1002/ecy.70501?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-10-14

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-10-14/)