Effects of environmental setting and diet on the gut microbial ecology of eastern hellbenders (Cryptobranchus alleganiensis alleganiensis).
Cummins C, Sutton W, McLeod T, Dallas JW, Ghotbi M
Wildlife Conservation
PubMedThe same gut-microbiome dynamics seen in zoo animals apply to any organism reintroduced to nature—including the beneficial soil microbes and fungi that plants in your garden depend on for nutrient uptake and disease resistance.
Scientists compared the gut bacteria and fungi of hellbenders (giant salamanders) raised in zoos versus those living in the wild. Zoo life dramatically reduced the variety of microbes in their guts, but feeding them wild food helped bring those communities back. After being released into rivers, the animals' gut microbes kept shifting to look more like those of wild hellbenders—showing the gut can recover from captivity.
Key Findings
Zoo-reared hellbenders showed significantly reduced bacterial richness compared to wild individuals, indicating captivity suppresses microbiome diversity.
Introducing a wild diet in zoo settings modulated the gut microbiome, with change primarily driven by bacterial species turnover rather than abundance shifts.
Both bacterial and fungal gut communities restructured after release into natural habitat, trending toward wild-type composition—suggesting microbiome recovery is possible post-reintroduction.
chevron_right Technical Summary
Zoo-raised hellbenders (large aquatic salamanders) have far less diverse gut bacteria than wild ones, but switching them to a wild diet helps restore that microbial balance—and their gut communities continue shifting toward wild-type after release into natural habitats.
Abstract Preview
Eastern hellbenders ( 16S rRNA sequencing was used to investigate dissimilarities between the gut microbiome of hellbenders in zoo and wild settings and to evaluate the impact of implementing a wil...
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