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Measurements
Linear
See Appendix 3 . Within the Bird I. sample, males significantly longer than females in all measurements, but ranges overlapped extensively. Caribbean birds slightly smaller and lighter than Northeastern birds.
Mass
Unsexed adults: Mean 107.6 g (range 92–125, n = 46) at Great Gull I., NY, in 1968 (LeCroy and Collins 1972); 112.3 g ± 5.8 SE (range 97–128, n = 160) at Cedar Beach, NY, in 1988; 114 g ± 5.7 SE (range 97–128, n = 132) at Cedar Beach in 1989; 112.5 g (range 88–139, n = 1,792) at Bird I., MA, in 1987–1995; 100.2 g ± 7.7 SE (range 90–113, n = 10) at Culebra, Puerto Rico. At Parguera, Puerto Rico, mean mass varied from 102 to 111 g depending on year (D. Shealer unpubl.). Food availability and timing of sampling influence weights.
Gochfeld, Michael, Joanna Burger and Ian C. Nisbet. 1998. Roseate Tern (Sterna dougallii), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/370
