The influence of population density on outcrossing rates in Mimulus ringens

Karron, Jeffrey D.; Thumser, Nina N; Tucker, Rosella; Hessenauer, Amy J

doi:10.1038/hdy.1995.121

Cited by 177 publications

(193 citation statements)

References 60 publications

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“…The six arrays had similar numbers of flowers and comparable rates of floral visitation by pollinators (Karron et al, 1995). As maternal plants had unique combinations of homozygous genotypes at four loci, progeny resulting from selfing and progeny produced by outcrossing could readily be distinguished (Karron et a!., 1995).…”

Section: Establlshment Of Experimental Populationsmentioning

confidence: 87%

“…Like many of its congeners (Sutherland & Vickery, 1988;Ritland & Ritland, 1989;Dudash & Ritland, 1991;Dole, 1992), M ringens is self-compatible and has a mixed-mating system. Outcrossing rates range from 0.15 to 0.33 and are positively correlated with population density (Karron et a!., 1995).…”

Section: Study Organismmentioning

confidence: 99%

“…This trait occurs in natural populations of M. ringens and is inherited as a single recessive gene (Karron et al, 1995 (Steel & Torrie, 1980;SAS Institute, 1990). …”

Section: Data Analysesmentioning

confidence: 99%

“…In this paper we characterize patterns of gene dispersal within replicate experimental populations of Mimulus ringens (squarestemmed monkeyflower). To facilitate assignment of paternity to every sampled seed, each population consisted of gdnets with unique multilocus combinations of homozygous genotypes (Karron et a!., 1995, Karron, 1996. We test the hypothesis that patterns of gene dispersal within populations will differ from patterns of pollinator movement because of the effects of pollen carryover.…”

Section: *Correspondencementioning

confidence: 99%

“…As maternal plants had unique combinations of homozygous genotypes at four loci, progeny resulting from selfing and progeny produced by outcrossing could readily be distinguished (Karron et a!., 1995). The paternity of all outcross progeny was determined with a simple exclusion procedure (Ellstrand, 1984;Brown et a!., 1989;Karron et a!., 1995, Karron, 1996. Absolute and relative distances between the maternal parent and pollen donor of each outcross seed were then calculated using the PASCAL program described above.…”

Section: Establlshment Of Experimental Populationsmentioning

confidence: 99%

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Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringens

et al. 1995

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Pollinator movements and pollen-mediated gene dispersal were quantified in experimental populations of square-stemmed monkeyflower (Mimulus ringens), a wetland perennial herb with a mixed-mating system. Each population consisted of genets with unique multilocus combinations of homozygous genotypes, facilitating assignment of paternity to all sampled seeds. Replicate arrays were planted at each of three spacings spanning the range of densities typically observed in natural M. ringens populations. In all six arrays the distribution of gene dispersal distances differed significantly from the distribution of pollinator flight movements. The mean gene dispersal distance was 1.46 times as far as the mean pollinator flight distance. These differences were probably caused by pollen carryover as bumblebees visited up to 12 M. ringens plants on a single foraging trip. Although gene movements exceeded pollinator flight distances, estimates of neighbourhood size were consistently low, ranging from 1.66 to 5.53. Therefore, high levels of random local genetic differentiation are likely in this species.

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Section: Establlshment Of Experimental Populationsmentioning

confidence: 87%

Section: Study Organismmentioning

confidence: 99%

“…This trait occurs in natural populations of M. ringens and is inherited as a single recessive gene (Karron et al, 1995 (Steel & Torrie, 1980;SAS Institute, 1990). …”

Section: Data Analysesmentioning

confidence: 99%

Section: *Correspondencementioning

confidence: 99%

Section: Establlshment Of Experimental Populationsmentioning

confidence: 99%

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Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringens

et al. 1995

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Fine‐scale spatial genetic structure, mating, and gene dispersal patterns in Parkia biglobosa populations with different levels of habitat fragmentation

Lompo

Vinceti

Konrad

et al. 2020

American J of Botany

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Premise A good understanding of genetic variation and gene dispersal in tree populations is crucial for their sustainable management, particularly in a context of rapid environmental changes. West African Sudanian savannahs are being fragmented and degraded, partly due to expansion of crop cultivation and monocultures that reduce tree density and may impact pollinators. The population dynamics of important indigenous trees could also be affected. We investigated the influence of habitat fragmentation on patterns of genetic diversity and gene dispersal of a key Sudanian agroforestry tree species, Parkia biglobosa . Methods Using 10 highly polymorphic nuclear microsatellites, we genotyped 2475 samples from reproductive trees, seedlings, and embryos in four tree populations presenting different levels of habitat fragmentation. Results Parkia biglobosa presented similar high genetic diversity across the four populations studied. Genetic diversity and inbreeding were similar between adults and embryo cohorts. In all four populations, the selfing rate was less than 1%. The effective number of pollen donors per tree was high ( N EP ~ 18–22), as was the pollen immigration rate (from 34 to 74%). Pollen dispersal was characterized by a fat‐tailed distribution with mean estimates exceeding 200 m. In three populations, stem diameter had a pronounced effect on male reproductive success. Here, the highest male reproductive success was observed in trees with a diameter at breast height between 60 and 75 cm. Conclusions At the scale analyzed, fragmentation does not seem to pose limitations to gene flow in any of the sites investigated, regardless of the landscape configuration associated with the different tree stands. The study provides useful insights on the reproductive biology of an important tree species in the West African savannahs.

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Hawkmoth and bee pollinators impact pollen dispersal at the landscape but not local scales in two species of Oenothera

Lewis

Fant

Moore

et al. 2023

American J of Botany

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Premise: Animal pollinators play an important role in pollen dispersal. Here, we assessed differences in pollen and seed dispersal and the role of pollinator functional groups with different foraging behaviors in generating patterns of genetic diversity over similar geographic ranges for two closely related taxa. We focused on two members of Oenothera section Calylophus (Onagraceae) that co-occur on gypsum outcrops throughout the northern Chihuahuan Desert but differ in floral phenotype and primary pollinator: Oenothera gayleana (bee) and O. hartwegii subsp. filifolia (hawkmoth). Methods: We measured breeding system and floral traits and studied gene flow and population differentiation at the local (<13 km; four populations) and landscape (60-440 km; five populations) scales using 10-11 nuclear (pollen dispersal) and three plastid (seed dispersal) microsatellite markers. Results: Both taxa were self-incompatible and floral traits were consistent with expectations for different pollinators. Seed and pollen dispersal patterns were distinctly different for both species. We found no evidence of genetic structure at the local scale but did at the landscape scale; O. gayleana showed greater differentiation and significant isolation by distance than in O. hartwegii subsp. filifolia. The plastid data were consistent with gravity dispersal of seeds and suggest that pollen dispersal is the principal driver of genetic structure in both species. Conclusions: We demonstrated that pollinator functional groups can impact genetic differentiation in different and predictable ways. Hawkmoths, with larger foraging distances, can maintain gene flow across greater spatial scales than bees.

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The influence of population density on outcrossing rates in Mimulus ringens

Cited by 177 publications

References 60 publications

Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringens

Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringens

Fine‐scale spatial genetic structure, mating, and gene dispersal patterns in Parkia biglobosa populations with different levels of habitat fragmentation

Hawkmoth and bee pollinators impact pollen dispersal at the landscape but not local scales in two species of Oenothera

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