JEB -- Enstipp et al. 204 (23): 4081 Figure IG4

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Fig. 4. Mean dive heart rate versus dive duration for three double-crested cormorants during shallow diving (N=208). Values for each cormorant demonstrated a significant negative relationship, with r² ranging from 0.60 to 0.84. The regression line is the average relationship for all cormorants and is described by y=257.48–5.21x, where y is mean dive heart rate and x is dive duration (r²=0.761).