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- W2487003728 abstract "ABSTRACr.-Temperatures of Ring-billed Gull (Larus delawarensis) eggs during the hatching period indicate that parents allow their last-hatched embryos to cool to 36.8?C, about 2?C below first-hatched eggs. Temperatures of artificial last-hatched eggs, corrected upwards to take account of embryonic metabolic heat, averaged only 35.5?C, suggesting an active effect of live embryos on parental incubation. In the laboratory, embryos in pipped eggs vocalized strongly when body temperature dropped below 36?C. When cold-induced calls triggered 4-min periods of rewarming (vocal regulation), embryonic temperature stabilized. Vocally regulated temperature was independent of the duration of the rewarming periods over a range of 3 to 8 min, but increased significantly with embryonic development over the final day of incubation. During the final 12 to 18 h before hatching, most embryos were able to regulate vocally their body temperature at or above the level at which cold-induced hatching delays occur. Results are consistent with the interpretation that cold-induced vocalizations are honest signals of offspring need for warmth. Vocal thermoregulation by pipping embryos is a potentially adaptive mechanism facilitating the maintenance of safe embryonic temperature during the critical hours before hatching. Received 31 March 1993, accepted 17 August 1993." @default.
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- W2487003728 date "1994-01-01" @default.
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- W2487003728 title "Development of vocal regulation of temperature by embryos in pipped eggs of ring-billed gulls" @default.
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