OUTBREEDING DEPRESSION VARIES AMONG COHORTS OF IPOMOPSIS AGGREGATA PLANTED IN NATURE
نویسندگان
چکیده
منابع مشابه
Estimates of gene flow among populations, geographic races, and species in the Ipomopsis aggregata complex.
Interpopulational gene flow within a species can reduce population differentiation due to genetic drift, whereas genetic exchange among taxa can impede speciation. We used allozyme data to estimate gene flow within and among geographic races and species of perennial herbs in the Ipomopsis aggregata complex (Polemoniaceae). Estimates of interpopulational gene flow within taxa from two methods (F...
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The form of angiosperm flowers is thought to have evolved in part via selection that excludes ineffective pollinators and increases the efficiency of pollen transfer by effective ones. In previous studies with the montane plant Ipomopsis aggregata, we documented pollinator-mediated selection on several aspects of floral form, including flower width. This character varies continuously within nat...
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Based on previous studies, extreme (>99%) self-sterility in scarlet gilia (Ipomopsis aggregata) appears to be involved in late-acting ovarian self-incompatibility (OSI). Here, we confirm this suggestion by comparing structural events that follow from cross- vs. self-pollinations of I. aggregata. Growth of cross- and self-pollen tubes in the style at 11 h and growth in the ovary at 24 h was equi...
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Fragmentation of animal and plant populations typically leads to genetic erosion and increased probability of extirpation. Although these effects can usually be reversed by re-establishing gene flow between population fragments, managers sometimes fail to do so due to fears of outbreeding depression (OD). Rapid development of OD is due primarily to adaptive differentiation from selection or fix...
متن کاملThe Genetic Interpretation of Inbreeding Depression and Outbreeding Depression.
Inbreeding with close relatives and outbreeding with members of distant populations can both result in deleterious shifts in the means of fitness-related characters, most likely for very different reasons. Such processes often occur simultaneously and have important implications for the evolution of mating systems, dispersal strategies, and speciation. They are also relevant to the design of br...
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ژورنال
عنوان ژورنال: Evolution
سال: 2000
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.0014-3820.2000.tb00051.x