EMBRYONIC FINE TUNING OF PIPPED EGG TEMPERATURE IN THE AMERICAN WHITE PELICAN

被引:24
作者
EVANS, RM
机构
[1] Department of Zoology, University of Manitoba, Winnipeg
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/S0003-3472(05)80998-4
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Upon pipping of the first (a) egg, the second (b) egg of the American white pelican, Pelecanus erythrorhynchos, is sometimes exposed to lower and more variable temperatures. Poor temperature control may arise at this time because the parents lack information about the current temperature state of the b-egg. Once chilled, embryos exhibit a graded response to cooling, which may restore the embryo's communicative link with the parent and enhance egg temperature control. This possibility suggested the hypothesis that pipped eggs are maintained at warmer temperatures than unpipped eggs during the final stages of incubation. At the onset of pipping, pipped a-eggs were significantly warmer than unpipped b-eggs in the same nest. This difference was not due to egg size. At more advanced nests, where the older a-egg had already hatched, temperatures of b-eggs increased significantly after pipping. Embryonic heat production was not a confounding variable in either situation. Results support the interpretation that late-stage embryos are able to influence their own incubation temperature by communicating with their parents. © 1990 The Association for the Study of Animal Behaviour.
引用
收藏
页码:963 / 968
页数:6
相关论文
共 18 条
[1]   INCUBATION AND NEST-BUILDING BEHAVIOUR OF BLACK-HEADED GULLS .V. POST-HATCHING PERIOD [J].
BEER, CG .
BEHAVIOUR, 1966, 26 :189-&
[2]   BROOD REDUCTION IN THE AMERICAN WHITE PELICAN (PELECANUS-ERYTHRORHYNCHOS) [J].
CASH, KJ ;
EVANS, RM .
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY, 1986, 18 (06) :413-418
[3]  
DANIEL WW, 1978, APPLIED NONPARAMETRI
[4]  
Drent R., 1973, P262
[5]  
Drent R. H, 1970, pUnpaginated
[6]  
Drent R.H., 1970, BEHAVIOUR S, V17, P1
[7]   EARLY SPRING FLIGHTS OF AMERICAN WHITE PELICANS - TIMING AND FUNCTIONAL-ROLE IN ATTRACTING OTHERS TO THE BREEDING COLONY [J].
EVANS, RM ;
CASH, KJ .
CONDOR, 1985, 87 (02) :252-255
[8]   EMBRYONIC VOCALIZATIONS AND THE REMOVAL OF FOOT WEBS FROM PIPPED EGGS IN THE AMERICAN WHITE PELICAN [J].
EVANS, RM .
CONDOR, 1988, 90 (03) :721-723
[9]   TERMINAL EGG-CHILLING AND HATCHING INTERVALS IN THE AMERICAN WHITE PELICAN [J].
EVANS, RM .
AUK, 1990, 107 (02) :431-434
[10]   VOCAL REGULATION OF TEMPERATURE BY AVIAN EMBRYOS - A LABORATORY STUDY WITH PIPPED EGGS OF THE AMERICAN WHITE PELICAN [J].
EVANS, RM .
ANIMAL BEHAVIOUR, 1990, 40 :969-979