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Trends in seabird densities off central California, showing increases in warm-water species (Black Storm-petrel, Brown Pelican, Xantus' Murrelet) and declines in cool-water species (Black-footed Albatross, Sooty Shearwater, Pink-footed Shearwater) From Ainley et al. 1995a. Horizontal lines above the x-axis indicate the mean abundance and the 95% confidence interval.