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Growth and energetics of chicks of the sooty tern sterna fuscata and common tern sterna hirundo



Growth and energetics of chicks of the sooty tern sterna fuscata and common tern sterna hirundo



Auk 98(2): 361-378



(S. hirundo) and S. fuscata were studied on Great Gull Island, New York and the Dry Tortugas, Florida [USA], respectively. The respiratory energy requirement was determined by measuring O2 consumption in a closed system. The growth energy requirement from the lipid and protein contents of a series of chicks spanning the range between hatching and fledging. Young common terns grow about twice as rapidly as young sooty terns. Their development follows a similar course, but energy budgets calculated for the 2 spp. differed in several ways. Maintenance metabolism was lower in the sooty tern owing to its warm enviroment. Sooty terns allocated more of their energy intake to lipid accumulation from an earlier age. In the sooty tern, the allocation of energy to growth initially was high, but its absolute amount decreased steadily throughout the growth period. In the common tern, both growth and maintenance energy allocations increased rapidly during the 1st 1/2 of the development period. In sooty tern chicks energy metabolism approached its maximum rate (135 kJ/day) by the end of the 1st 1/3 of the development period, after which it leveled off. In the common tern, energy metabolism increased from about 1/4 of its maximum during the 1st 5 days after hatching to its maximum of 200 kJ/day during the 3rd wk of the postnatal development period. Although these observations support the hypothesis that slow growth in the pelagic seabirds is selected to reduce the energy requirement of the chick, our energy budgets also suggest that a doubling of the growth rate by the sooty tern would increase the maximum energy requirement of the chick by only 20% and the total feeding requirement of the adult by only 5%. The levels of water in muscles suggest that the sooty tern develops mature function earlier than does the common tern, which in itself might be sufficient to account for the slower growth of the 1st species.

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