Wind-farm bird surveys often missed the season when migrants were present
WHAT THE EVIDENCE SAYS
Researchers reviewed surveys for four migratory species at 70 wind-farm developments and compared field timing with eBird-based weekly relative-abundance patterns. About half of assessed surveys were outside the modeled optimum; around one-fifth missed the modeled potential presence window altogether. Less well-timed surveys were associated with lower stated likelihood-of-occurrence judgments.
WHY IT MATTERS / OUR READ
Environmental impact assessment is only as representative as the period spent observing. A technically correct field protocol conducted at the wrong seasonal window can falsely reassure a project team, so baseline survey design should incorporate migration phenology before fieldwork begins.
CAVEATS / UNCERTAINTY
Weekly abundance predictions and archival assessment records are imperfect. The analysis addresses survey timing and estimated occurrence, not a quantified collision-mortality effect attributable to these 70 wind farms.
SOURCE
Shi et al. · Journal of Applied Ecology · migratory bird survey timing
View original evidence ↗
Comparing 70 eastern Australian projects against weekly occurrence patterns exposes a preventable monitoring blind spot.
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