THE PROBLEM OF TEMPORAL SCALE IN OPTIMIZATION - 3 CONTRASTING VIEWS OF HUMMINGBIRD VISITS TO FLOWERS

被引:39
作者
GASS, CL
ROBERTS, WM
机构
关键词
D O I
10.1086/285443
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
We modeled hummingbird visits to flowers on three temporal scales: tongue loading, the licking cycle, and entire visits to flowers. The nectar concentration that maximizes energy intake mte increases with the temporal scale of integration; therefore, optimal nectar concentration for nectar volumes that require many licks is higher than predicted by models that assume single licks. Since birds must position, insert, and withdraw their bills in addition to licking nectar, the optimum at the scale of flower visits is even higher. This "overhead time cost" of handling flower morphology, for most nontraplining hummingbirds under most natural conditions, is as great as or greater than the cost of handling nectar. For these birds, the potential variation in the fine-scale factors that determine nectar intake rate during licking has little effect on flower-handling time and therefore is unlikely to determine optimal nectar concentration or the profitability of visiting flowers. The conclusion that energy intake rate and optimal nectar concentration are sensitive to temporal scale of integration applies at all scales in hummingbird foraging systems, and we suggest that it also generalizes across systems.
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页码:829 / 853
页数:25
相关论文
共 94 条
[1]  
Allen TFH., 1982, HIERARCHY PERSPECTIV
[2]  
ANGEHR GR, 1980, THESIS U COLORADO BO
[3]   ECONOMICS OF BREEDING TERRITORIALITY IN MALE CALLIOPE HUMMINGBIRDS [J].
ARMSTRONG, DP .
AUK, 1987, 104 (02) :242-253
[4]  
BAKER H G, 1975, Biotropica, V7, P37, DOI 10.2307/2989798
[5]   CALCULATION OF SUGAR CONCENTRATION IN FLOWER NECTAR [J].
BOLTEN, AB ;
FEINSINGER, P ;
BAKER, HG ;
BAKER, I .
OECOLOGIA, 1979, 41 (03) :301-304
[6]   WHY DO HUMMINGBIRD FLOWERS SECRETE DILUTE NECTAR [J].
BOLTEN, AB ;
FEINSINGER, P .
BIOTROPICA, 1978, 10 (04) :307-309
[7]   CONVERGENCE, COMPETITION, AND MIMICRY IN A TEMPERATE COMMUNITY OF HUMMINGBIRD-POLLINATED FLOWERS [J].
BROWN, JH ;
KODRICBROWN, A .
ECOLOGY, 1979, 60 (05) :1022-1035
[8]   TEMPERATURE-DEPENDENCY OF OPTIMAL NECTAR CONCENTRATIONS FOR BIRDS [J].
CALDER, WA .
JOURNAL OF THEORETICAL BIOLOGY, 1979, 78 (02) :185-196
[9]   ENERGETICS OF SMALL BODY SIZE AND HIGH LATITUDE - RUFOUS HUMMINGBIRD IN COASTAL ALASKA [J].
CALDER, WA .
INTERNATIONAL JOURNAL OF BIOMETEOROLOGY, 1976, 20 (01) :23-35
[10]  
CARPENTER FL, 1988, 19 ACT C INT ORN, V1, P537