Figure 2
From: Anthropogenic change decouples a freshwater predator’s density feedback
Anthropogenic changes in Lake Erie during 1969–2018. Changes include: (a) total lakewide commercial walleye harvest (solid line); (b) annual lakewide total phosphorus (TP) inputs; (c) mean annual water transparency in the western basin (gray shading indicates the standard deviation); (d) total annual soluble reactive phosphorus (SRP) inputs from the Maumee River; (e) climate variability, represented using an ordination axis of seasonal air and water temperatures (Supplementary Information – Sect. 2); and (f) total prey abundance (CPUE; individuals·trawl min−1). We also plotted (a) the estimated size of the older (age 3 +) walleye population (dashed line) to illustrate its relationship to commercial harvest.
