One Mexican river held fish functions not captured by species totals
WHAT THE EVIDENCE SAYS
An Amacuzac River field survey recorded 17 fish species and analyzed 19 ecological functional traits across eight functional groups. Functional diversity varied between sampling reaches, with a downstream reach showing a comparatively high complement of functions; several functional roles were represented by a single species.
WHY IT MATTERS / OUR READ
If conservation planning counts only species, it can miss whether particular feeding, habitat or movement roles remain in a river. Maintaining functional redundancy may make restoration outcomes more resilient.
CAVEATS / UNCERTAINTY
Site comparisons are observational and time-limited; high functional richness is not direct evidence of good water quality or restored ecosystem condition. Trait categories and sampling effort influence results.
SOURCE
Neotropical Ichthyology · Amacuzac river fish trait study
View original evidence ↗
Functional traits revealed uneven distributions of ecological roles across a river network.
Read the Wild Lands assessment →