Fitness Consequences of Mating System, Seed Weight, and Emergence Date in a Winter Annual, Collinsia verna

Evolution ◽  
1989 ◽  
Vol 43 (6) ◽  
pp. 1263 ◽  
Author(s):  
Susan Kalisz
Keyword(s):  
Mating System ◽  
Seed Weight ◽  
Fitness Consequences ◽  
Collinsia Verna ◽  
Winter Annual ◽  
Emergence Date

Phenotypic plasticity in mating-system traits in the annual Collinsia verna

Botany ◽  
2013 ◽  
Vol 91 (9) ◽  
pp. 597-604 ◽  
Author(s):  
Rachel B. Spigler ◽  
Susan Kalisz
Keyword(s):  
Genetic Variation ◽  
Mating System ◽  
Fruit Set ◽  
Global Climate ◽  
Abiotic Factors ◽  
Selective Advantage ◽  
Anther Dehiscence ◽  
Flower Number ◽  
Floral Longevity ◽  
Collinsia Verna

Variation in abiotic factors can influence the selective advantage of selfing and expression of the mating system if mating-system modifier traits are phenotypically plastic. However, relative to biotic factors, the role of abiotic conditions in driving variation in and evolution of plant mating systems is rarely addressed. We use an experimental approach to evaluate the extent to which genetic and environmental variation influence the expression of mating-system traits in the annual Collinsia verna. We subjected families to two environmental treatments in the greenhouse that varied in light and water availability, simulating natural and short flowering-season conditions, and examined the following: autonomous fruit set, flower number, flower size, rate of anther dehiscence, floral longevity, and timing of selfing. Our results demonstrate plasticity in nearly all traits examined. Compared with natural-season conditions, plants under short-season conditions produced fewer, smaller flowers and selfed approximately one day later due to slower anther dehiscence rates. Autonomous fruit set was similar across treatments, but there was genetic variation for plasticity in this important trait. Further, we show genetic variation in autonomous fruit set, timing of selfing, and flower number and size. Given the effects of global climate change on the duration of growing season, our results suggest that plasticity in mating-system traits will affect mating-system variation and, thus, opportunities for selection.

scholarly journals FITNESS CONSEQUENCES OF OUTCROSSING IN A SOCIAL SPIDER WITH AN INBREEDING MATING SYSTEM

Evolution ◽  
2013 ◽  
Vol 68 (2) ◽  
pp. 343-351 ◽  
Author(s):  
Reut Berger-Tal ◽  
Cristina Tuni ◽  
Yael Lubin ◽  
Deborah Smith ◽  
Trine Bilde
Keyword(s):  
Mating System ◽  
Social Spider ◽  
Fitness Consequences

scholarly journals The mixed mating system of the sea palm kelp Postelsia palmaeformis : few costs to selfing

2010 ◽  
Vol 278 (1710) ◽  
pp. 1347-1355 ◽  
Author(s):  
Allison K. Barner ◽  
Catherine A. Pfister ◽  
J. Timothy Wootton
Keyword(s):  
Mating System ◽  
First Generation ◽  
Genetic Load ◽  
Mixed Mating ◽  
Reproductive Assurance ◽  
Isolated Populations ◽  
Mixed Mating System ◽  
Fitness Consequences ◽  
Limited Dispersal ◽  
Self Fertilization

Naturally isolated populations have conflicting selection pressures for successful reproduction and inbreeding avoidance. These species with limited seasonal reproductive opportunities may use selfing as a means of reproductive assurance. We quantified the frequency of selfing and the fitness consequences for inbred versus outcrossed progeny of an annual kelp, the sea palm ( Postelsia palmaeformis ). Using experimentally established populations and microsatellite markers to assess the extent of selfing in progeny from six founding parents, we found the frequency of selfing was higher than expected in every population, and few fitness costs were detected in selfed offspring. Despite a decline in heterozygosity of 30 per cent in the first generation of selfing, self-fertilization did not affect individual size or reproduction, and correlated only with a marginally significant decline in survival. Our results suggest both that purging of deleterious recessive alleles may have already occurred and that selfing may be key to reproductive assurance in this species with limited dispersal. Postelsia has an alteration of a free-living diploid and haploid stage, where the haploid stage may provide increased efficiency for purging the genetic load. This life history is shared by many seaweeds and may thus be an important component of mating system evolution in the sea.

Floral Correlates and Fitness Consequences of Mating-System Variation in Turnera ulmifolia

Evolution ◽  
1995 ◽  
Vol 49 (3) ◽  
pp. 545 ◽  
Author(s):  
Svenja Belaoussoff ◽  
Joel S. Shore
Keyword(s):  
Mating System ◽  
Fitness Consequences ◽  
Turnera Ulmifolia
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