Figure 2: Average daily temperatures and Savannah sparrow densities at breeding and wintering grounds.
From: Winter temperatures limit population growth rate of a migratory songbird
(a) Mean (±95% credible interval) estimated breeding population size (black points) and population counts (orange) at the breeding grounds. (b) Mean (±s.e.) number of Savannah sparrows counted per observer hour at Christmas Bird Count survey routes on the wintering grounds. (c) Average daily temperatures (°C) at the wintering grounds (blue) and breeding grounds (orange) during the pre-breeding (dotted line), breeding (solid line), and post-breeding (dashed line) seasons.
