Changes in Cassin’s Auklet and Sooty Shearwater numbers

Post date:
Mar 29, 2013
Cassin’s Auklet and Sooty Shearwater numbers

Figure 1:  Changes in resident Cassin’s Auklet (upper panel) and migratory Sooty Shearwater (lower panel) relative abundance (natural log of birds km-2) on 90 CalCOFI/CCE-LTER surveys, May 1987 - July 2012.  Stacked bars denote seasonal density estimates, with 2 Locally Weighted Regression (LOWESS) smoothing lines on summed annual estimates shown to illustrate short-term (bandwidth=0.3, solid) and long-term (bandwidth=0.8, dashed) variability.    

 

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Courtesy of the authors
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Cassin’s Auklets and Sooty Shearwaters indicate ecosystem change off southern California