Arid
DOI10.1890/03-3138
Insect seed predators as novel agents of selection on fruit color
Whitney, KD; Stanton, ML
通讯作者Whitney, KD
来源期刊ECOLOGY
ISSN0012-9658
EISSN1939-9170
出版年2004
卷号85期号:8页码:2153-2160
英文摘要

The ecological and evolutionary dynamics of fruit color polymorphisms remain poorly known because patterns and agents of selection have rarely been identified. Here, we examine Acacia ligulata, a shrub of the Australian arid zone characterized by a red/yellow/orange aril color polymorphism. Seed production patterns over four populations and three years suggested that spatially variable selection may be acting to maintain the polymorphism: red and yellow aril color morphs each had the highest seed production in alternate sites. Seed production differences between morphs were a function of both intrinsic plant characters (fruit production) and predispersal seed predation, which affects the number of viable seeds matured per ovule. Fruit production differences are hypothesized to result from a genotype-by-environment interaction, perhaps related to plant vigor. In contrast, morph differences in the numbers of viable seeds per ovule are produced via differential seed predation by heteropteran insects, as demonstrated by exclusion experiments. Because these predators feed when aril color is not visible, differential predation is evidently a response to pleiotropic effects of fruit color alleles. We suggest that such pleiotropic effects may be a common feature of fruit color polymorphisms, and that the most obvious selective agents (that is, seed dispersers) may not always be the most important.


英文关键词Acacia Acacia ligulata Australian arid zone Coleotichus fruit color polymorphism insect seed predators Melanterius pleiotropic effects pre-dispersal seed predation seed production patterns spatially variable selection Trichilogaster
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000223824300012
WOS关键词FLOWER-COLOR ; CAPTIVE SILVEREYES ; RUBUS-SPECTABILIS ; POLYMORPHISM ; PERFORMANCE ; DISPERSAL ; CHOICES ; ACACIA ; EVOLUTION ; AUSTRALIA
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/146611
作者单位(1)Univ Calif Davis, Ctr Populat Biol, Davis, CA 95616 USA;(2)Univ Calif Davis, Sect Evolut & Ecol, Davis, CA 95616 USA
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GB/T 7714
Whitney, KD,Stanton, ML. Insect seed predators as novel agents of selection on fruit color[J]. University of California, Davis,2004,85(8):2153-2160.
APA Whitney, KD,&Stanton, ML.(2004).Insect seed predators as novel agents of selection on fruit color.ECOLOGY,85(8),2153-2160.
MLA Whitney, KD,et al."Insect seed predators as novel agents of selection on fruit color".ECOLOGY 85.8(2004):2153-2160.
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