Pennsylvania Wildlife Update: How Bird Town Initiatives and Forestry Projects Target Grouse Recovery

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Habitat loss laid the groundwork, but disease accelerated the crash. The arrival of West Nile virus in the early 2000s devastated regional populations. Research conducted by Pennsylvania Game Commission biologists confirmed that grouse chicks are uniquely susceptible to the virus, exhibiting high mortality rates when bitten by infected Culex mosquitoes during humid summer brooding periods.

The disease struck low-lying river bottoms and warm valley forests hardest. Mosquito populations thrive in standing water pools below 1,000 feet, which overlapped directly with fragmented farm-adjacent woodlands. Surviving grouse populations retreated toward higher elevations where cooler microclimates keep mosquito densities down. However, high-elevation plateau forests often lack the dense stem density grouse need to forage on buds and catkins during severe winters, leaving isolated populations vulnerable to raptors and nutritional stress.