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# For Europe’s salamander fungus, diversity and density are telling different stories
- URL: https://intelligence.wildlandseco.com/2026-09-19-bsal-host-diversity-density/
- Published: 2026-09-19T15:56:57.000Z
- Updated: 2026-09-19T16:11:46.000Z
- Description: Across Bsal-positive European sites, infection prevalence fell as amphibian richness rose, while fire salamanders showed a reversed density relationship consistent with disease-driven population loss.
- Author: Benjamin Worlund
- Tags: Bsal, salamanders, Disease ecology, host diversity, amphibians, One Health, Wildlife, Disease, Community ecology, #ecological-intelligence, #brief-2026-09-19, #priority-read, #peer-reviewed, #geo-europe

Evidence

Peer-reviewed

Geography

Germany and Spain

System

Amphibian communities exposed to Batrachochytrium salamandrivorans

## WHAT THE EVIDENCE SAYS

A multi-site synthesis assembled 2,625 amphibians from Bsal-positive locations spanning 14 species. Across infected communities, Bsal prevalence was negatively associated with host-species richness and positively associated with total amphibian abundance. In fire salamanders alone, abundance instead tracked lower prevalence, a pattern the authors interpret cautiously because disease-caused mortality can itself lower host density.

## WHY IT MATTERS / OUR READ

Disease ecology can invert the meaning of a familiar metric. Richness may be associated with lower pathogen prevalence, but abundance can be both a driver and a consequence of disease; management should avoid translating a cross-site 'dilution' pattern into a simple diversity prescription without resolving mechanism.

## CAVEATS / UNCERTAINTY

The analysis compiles heterogeneous observational datasets and is dominated by German sites. The fire-salamander richness-by-density interaction was not statistically significant, and infected-site sampling, life stage and mortality can bias apparent prevalence relationships. This does not demonstrate a diversity intervention that controls Bsal.

## SOURCE

Journal of Applied Ecology  
[View original evidence ↗](https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2664.70553?ref=intelligence.wildlandseco.com)

From the Morning Brief · 2026-09-19

[Read the full Morning Brief →](https://intelligence.wildlandseco.com/morning-brief-2026-09-19/)