Negative frequency-dependent selection maintains a dramatic flower color polymorphism in the rewardless orchid Dactylorhiza sambucina (L.) Soo

被引:275
作者
Gigord, LDB [1 ]
Macnair, MR [1 ]
Smithson, A [1 ]
机构
[1] Univ Exeter, Dept Biol Sci, Hatherly Labs, Exeter EX4 4PS, Devon, England
关键词
D O I
10.1073/pnas.111162598
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The orchid Dactylorhiza sambucina shows a stable and dramatic flower-color polymorphism, with both yellow- and purple-flowered individuals present in natural populations throughout the range of the species in Europe. The evolutionary significance of flower-color polymorphisms found in many rewardless orchid species has been discussed at length, but the mechanisms responsible for their maintenance remain unclear. Laboratory experiments have suggested that behavioral responses by pollinators to lack of reward availability might result in a reproductive advantage for rare-color morphs. Consequently, we performed an experiment varying the relative frequency of the two color morphs of D. sambucina to test whether rare morph advantage acted in the natural habitat of the species. We show here clear evidence from this manipulative experiment that rare-color morphs have reproductive advantage through male and female components. This is the first demonstration, to our knowledge, that negative frequency-dependent selection through pollinator preference for rare morphs can cause the maintenance of a flower-color polymorphism.
引用
收藏
页码:6253 / 6255
页数:3
相关论文
共 29 条
[1]   PATTERNS AND MAINTENANCE OF EXTRAORDINARY VARIATION IN THE CARIBBEAN ORCHID, TOLUMNIA (ONCIDIUM) VARIEGATA [J].
ACKERMAN, JD ;
GALARZAPEREZ, M .
SYSTEMATIC BOTANY, 1991, 16 (01) :182-194
[2]   EVIDENCE FOR STABILIZING AND APOSTATIC SELECTION BY WILD BLACKBIRDS [J].
ALLEN, JA .
NATURE, 1972, 237 (5354) :348-+
[4]   EVIDENCE FOR APOSTATIC SELECTION BY WILD PASSERINES [J].
ALLEN, JA ;
CLARKE, B .
NATURE, 1968, 220 (5166) :501-&
[5]  
Ayala F.J., 1974, Annual Rev Ecol Syst, V5, P115, DOI 10.1146/annurev.es.05.110174.000555
[6]  
CHITTKA L, 1992, J COMP PHYSIOL A, V171, P171, DOI 10.1007/BF00188925
[7]   FREQUENCY-DEPENDENT SELECTION [J].
CLARKE, B ;
ODONALD, P .
HEREDITY, 1964, 19 (02) :201-&
[8]   FREQUENCY-DEPENDENT SELECTION, METRICAL CHARACTERS AND MOLECULAR EVOLUTION [J].
CLARKE, BC ;
SHELTON, PR ;
MANI, GS .
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, 1988, 319 (1196) :631-640
[9]   FREQUENCY-DEPENDENT SELECTION AND ADAPTIVE SURFACES FOR FLORAL CHARACTER COMBINATIONS - THE POLLINATION OF POLEMONIUM-VISCOSUM [J].
CRESSWELL, JE ;
GALEN, C .
AMERICAN NATURALIST, 1991, 138 (06) :1342-1353
[10]   THE FLORAL BIOLOGY OF THELYMITRA-EPIPACTOIDES (ORCHIDACEAE), AND THE IMPLICATIONS OF POLLINATION BY DECEIT ON THE SURVIVAL OF THIS RARE ORCHID [J].
CROPPER, SC ;
CALDER, DM .
PLANT SYSTEMATICS AND EVOLUTION, 1990, 170 (1-2) :11-27