Amino acid-specific isotopes reveal changing five-dimensional niche segregation in Pacific seabirds over 50 years.

Double-crested cormorants showed a trend of niche change (distance between centroids of two time periods ≤ 2.4) in all three approaches, although the probability was low (≤ 0.6, Table S9 ), whereas pelagic cormorants showed a larger change (distance ≤ 0.87 and probability of ≤ 0.2).

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On the other hand, an increasing trend observed for NND values and the standard deviation of NND is higher in magnitude, reflecting a variation in density and evenness of species packing, respectively.

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