Effect of canopy closure on pollen dispersal in a wind-pollinated species (Fagus sylvatica L.)

Millerón, Matías; Heredia, Unai López de; Lorenzo, Zaida; Perea, Ramón; Dounavi, Aikaterini; Alonso, J.; Gil, Luis; Nanos, Nikos

doi:10.1007/s11258-012-0125-2

Cited by 46 publications

(35 citation statements)

References 51 publications

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“…According to the reproductive assurance hypothesis (Lloyd 1979), when outcross pollen is unavailable, selfing allows to continue seed production. In our case, small subpopulations of P. cembra in the Tatras can experience outcross pollen limitation because sporadic mature trees are scattered in the forest so that inter-individual distances (even between nearest neighbors) are longer, and due to the presence of the other species, harder to traverse (Milleron et al 2012) as compared with large, dense subpopulations (especially Morskie Oko). The average outcrossing rate found in this study translates into the expected inbreeding level F=(1-0.72)/(1+0.72)= 0.16.…”

Section: Discussionmentioning

confidence: 83%

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Chybicki

Dzialuk

2014

Tree Genetics & Genomes

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Mating systems have long been recognized as key factors determining genetic structure within and between populations. Outcrossing promotes genetic diversity and gene flow between populations, while inbreeding, on the other hand, decreases recombination rates, facilitating fixation of co-adapted genes. In small populations, selfing moderates pollen limitation because of low mate availability, but at the cost of increased inbreeding depression. These conflicts are of more than theoretical interest; they are critical for the management of endangered species. In order to help designing conservation strategies for the management of the gene pool of fragmented populations of Pinus cembra, a protected species in Poland, we have characterized pollen flow and mating structure using nuclear microsatellite markers. We demonstrated that P. cembra in the studied stands of the Tatra Mts. is characterized by an average outcrossing rate (t) of 0.72. Unlike with the existing approaches, using the newly developed Bayesian method, we found that population size and seasonal variation had confounding effects on outcrossing rates. In concordance with predictions, large populations showed significantly higher outcrossing rates (t=0.89) than smaller ones (t=0.51). Temporal variation revealed in the outcrossing rate might be linked with masting behavior of the species. On the other hand, we showed that outcrossing rates were not associated with a trunk diameter of a mother tree. Our study also demonstrated that biparental inbreeding is a significant component of mating system. However, we further show that pollen dispersal follows a fat-tailed distribution (with the average dispersal distance of 1,267 m) so that at least some long-distance pollen dispersal must be occurring.Overall, we conclude that the high inbreeding (both selfing and mating between relatives) found in P. cembra buffers for pollen limitation. We argue that small, isolated stands can be at risk of gene pool erosion, despite the potential for longdistance pollen and seed dispersal.

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Section: Discussionmentioning

confidence: 83%

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Chybicki

Dzialuk

2014

Tree Genetics & Genomes

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“…2). Furthermore, increased canopy closure also affects pollen dispersal and mating system parameters: selfing rate (s), effective pollen pool size (N ep ) and variance of reproductive success (V) (García et al 2005;Milleron et al 2012).…”

Section: Foreseen Evolutionary Impact Of Common Forestry Practicementioning

confidence: 99%

Considering evolutionary processes in adaptive forestry

Lefèvre

Boivin

Bontemps

et al. 2013

Annals of Forest Science

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Managing forests under climate change requires adaptation. The adaptive capacity of forest tree populations is huge but not limitless. Integrating evolutionary considerations into adaptive forestry practice will enhance the capacity of managed forests to respond to climate-driven changes. & Aims Focusing on natural regeneration systems, we propose a general framework that can be used in various and complex local situations by forest managers, in combination with their own expertise, to integrate evolutionary considerations into decision making for the emergence of an evolution-oriented forestry. & Methods We develop a simple process-based analytical grid, using few processes and parameters, to analyse the impact of forestry practice on the evolution and evolvability of tree populations. & Results We review qualitative and, whenever possible, quantitative expectations on the intensity of evolutionary drivers in forest trees. Then, we review the effects of actual and potential forestry practice on the evolutionary processes. We illustrate the complexity of interactions in two study cases: the evolutionary consequences for forest trees of biotic interactions and of highly heterogeneous environment. & Conclusion Evolution-oriented forestry may contribute adapting forests to climate change. It requires combining short-term and long-term objectives. We propose future lines of research and experimentation.

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“…Additionally, future studies using molecular markers to identify parentage relationships between parents and successfully established offspring may be used to confirm the patterns revealed by inverse modeling ( [37,38]). Previous studies have shown that results for sapling dispersal kernels estimated via classical inverse modeling were remarkably similar to the ones obtained by genetic methods [36,39].…”

Section: Fecundity Dynamicsmentioning

confidence: 99%

Effective Seed Dispersal and Fecundity Variation in a Small and Marginal Population of Pinus pinaster Ait. Growing in a Harsh Environment: Implications for Conservation of Forest Genetic Resources

Charco

Venturas

Gil

et al. 2017

Forests

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Small-size, relict and marginal tree-species populations are a priority for conservation of forest genetic resources. In-situ conservation of these populations relies on adequate forest management planning based on knowledge and understanding of both ecological (i.e., recruitment or dispersal dynamics) and population-genetic processes (i.e., female reproductive success, gene flow or inbreeding). Here, we estimate the fecundity (or female reproductive success) of adult trees (i.e., the number of successfully established offspring/adult tree) and the effective dispersal distance distribution in the pine forest of Fuencaliente (southern Spain), a small-sized, marginal and relict population of maritime pine growing on a steep, craggy hill with just 312 reproductively active individuals. Previous studies have shown the population to present reduced allelic richness and suffer from genetic introgression from nearby exotic plantations of unknown origin. Between 2003 and 2004, we surveyed all adults and recruits and we measured several adult-specific covariates, including the number of cones of all adults. The population was found to be distributed into two nuclei with 268 (Stand 1) and 44 adults (Stand 2). We used inverse modeling to adjust several dispersal-and-fecundity models including a model with random variation in fecundity among adults (Unrestricted Fecundity or UF model). Results show that: (i) the average fecundity is 2.5-3.2 recruits/adult; (ii) the mean effective dispersal distance is restricted to 13-24 m and (iii) fecundity is most likely controlled by the spatial location of adult trees in Stand ,1 but it should be considered randomly distributed in Stand 2 (in this stand five adults mothered 80% of recruits). We conclude that the low fecundity in Stand 1 and the unequal fecundity in Stand 2 may decrease the population genetic diversity and lead to lower effective population size while the low average dispersal distance may reduce the probability of this population expanding to adjacent areas. In light of the results, we define the management priorities for in-situ conservation of this population.

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Effect of canopy closure on pollen dispersal in a wind-pollinated species (Fagus sylvatica L.)

Cited by 46 publications

References 51 publications

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Bayesian approach reveals confounding effects of population size and seasonality on outcrossing rates in a fragmented subalpine conifer

Considering evolutionary processes in adaptive forestry

Effective Seed Dispersal and Fecundity Variation in a Small and Marginal Population of Pinus pinaster Ait. Growing in a Harsh Environment: Implications for Conservation of Forest Genetic Resources

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