Marc Johnson (he/him): However, there is a stunning decrease in effective population size in recent time across all 3 spp. While this decline starts shortly after deglaciation, the most precipitous decline occurs at the onset of European settlement, extensive deforestation and then widespread intensive urbanization. 3/3

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Marc Johnson (he/him) evoecolab.bsky.social · Feb 15, 2025
Excited to share our latest #urbanevolution paper led by former #postdoc Dr. Lindsay Miles & @ecarlen.bsky.social, along with undergrad Zain Nassrulah and @urbanevol.bsky.social #evolbiol #urbanecology 🌎 journals.plos.org/plosone/arti... 1/3
No detectable effect of urbanization on genetic drift or gene flow in specialist herbivorous insects of milkweed

Urbanization is hypothesized to isolate populations and restrict dispersal, leading to reduced genetic diversity and increased genetic differentiation. We tested this hypothesis in specialist herbivor...

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Marc Johnson (he/him) evoecolab.bsky.social · Feb 15, 2025
This was a large multiyear study, examining population and landscape genetic variation in 3 specialist insects of milkweed across 6 cities. Surprisingly, even though urbanization decreased abundance of some insects, there was no clear effect of urbanization on gene flow or drift 2/3

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Marc Johnson (he/him) evoecolab.bsky.social
However, there is a stunning decrease in effective population size in recent time across all 3 spp. While this decline starts shortly after deglaciation, the most precipitous decline occurs at the onset of European settlement, extensive deforestation and then widespread intensive urbanization. 3/3
Feb 15, 2025 18:36
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