Poleward Range Shifts of Breeding Birds in Wisconsin
Drake T. Stallworth, Nicholas M. Anich, Benjamin Zuckerberg

TL;DR
This study shows that bird species in Wisconsin are shifting their breeding ranges northward due to climate change.
Contribution
The paper provides empirical evidence of poleward range shifts in Wisconsin's breeding birds using two atlases.
Findings
Southerly bird species are expanding their ranges and shifting boundaries northward.
Boreal species show a northward movement in their overall distribution despite no range boundary shift.
The poleward shift in bird ranges is a consistent indicator of climate change impacts.
Abstract
Climate change is causing shifts in the geographic ranges of multiple species across the world. Birds are a critical taxon for observing range shifts because their high mobility allows them to track shifting climates over time and space. Breeding bird atlases are large‐scale breeding bird surveys that are essential for tracking species' ranges in response to climate change. In this paper, our goal was to analyze Wisconsin's Breeding Bird Atlases (1995–2000 and 2015–2019) to document changes in range size, mean latitude, and range boundary shift of breeding birds. Concordant with our predictions, we found that many southerly bird species with northern range limits were both expanding in distribution and shifting their range boundaries poleward. Contrary to our predictions, northerly species with southern range limits in the state were not shifting their boundary poleward but demonstrated…
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Taxonomy
TopicsSpecies Distribution and Climate Change · Ecology and Vegetation Dynamics Studies · Avian ecology and behavior
