Urbanisation can restructure pond communities without simply reducing biodiversity
WHAT THE EVIDENCE SAYS
Amphibians and macroinvertebrates were surveyed annually in 32 freshwater ponds from 2019–2024, with microbial communities sampled in 17 ponds in 2024. Community composition shifted with urbanicity, but there was minimal evidence that amphibian or macroinvertebrate richness declined. Wood frog larval density did decline, while pH and temperature were stronger predictors across taxa than urbanicity alone.
WHY IT MATTERS / OUR READ
The common shorthand that more urbanization necessarily means less biodiversity can miss community turnover, vulnerable taxa and the importance of retaining small water bodies. Composition and habitat loss may matter even when total richness looks stable.
CAVEATS / UNCERTAINTY
This is a regional study of 32 ponds, and stable richness can conceal changes in species identity or loss of sensitive taxa. The findings do not imply that urbanization is ecologically benign or that they generalize to every pondscape.
SOURCE
Diversity and Distributions · Original evidence
View original evidence ↗
Across 32 Connecticut ponds, urbanicity shifted amphibian and macroinvertebrate community composition but provided little evidence of a simple richness decline.
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