Year and tree effect on reproductive organisation of Cedrus atlantica in a natural forest

Krouchi, Fazia; Derridj, Arezki; Lefèvre, François

doi:10.1016/j.foreco.2004.05.013

Cited by 34 publications

(47 citation statements)

References 24 publications

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“…In their review, Schoen and Brown (1991) found N e estimates for tree species in the range of other outbreeding plants: mean values around 3,000 for Pseudotsuga menziesii and >8,000 for Pinus sylvestris and Picea abies, with high variations among populations within each species. However, locally, seed and pollen contributions to reproduction are highly uneven among individuals (Burczyk et al 2002;Krouchi et al 2004;Oddou-Muratorio et al 2005), and the great majority of the pollen disperses only in the close neighbourhood, which can greatly reduce the effective population size. In their review, Smouse and Sork (2004) found that the effective pollen pool size N ep , defined as the inverse of the probability that a female draws two offsprings from the same father, ranges from 2 to 200 in tree populations.…”

Section: Random Changes Due To Genetic Drift and Mating Systemmentioning

confidence: 99%

“…In order to reduce the intensity of genetic drift (increase N e ) in small populations, silviculture may be oriented towards reduced variance of fecundity (V) between trees: Reducing V will not only increase N e within each annual seed production, as mentioned above, but it will also reduce the fluctuation of effective contributions across years and thus increase pluri-annual N e estimates (Krouchi et al 2004) . This would be another objective assigned to thinning and pruning.…”

Section: Evolution-oriented Forestry Why Not?mentioning

confidence: 99%

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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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Section: Random Changes Due To Genetic Drift and Mating Systemmentioning

confidence: 99%

Section: Evolution-oriented Forestry Why Not?mentioning

confidence: 99%

Considering evolutionary processes in adaptive forestry

Lefèvre

Boivin

Bontemps

et al. 2013

Annals of Forest Science

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“…The stem circumference at breast height was measured on each tree. The fecundity of Cedrus trees varies greatly across years and the trees show different allocations to male and female reproduction that remain relatively stable (Krouchi et al, 2004). For this reason, the male flowering intensity was scored following a 0-3 scale as an indication of the potential male fecundity of the reproductive trees, as the seeds used for the germination test resulted from pollination that occurred 2 years before.…”

Section: Methodsmentioning

confidence: 99%

“…In this case, this means that the mating system is controlled by the biology of the species and not only by the demography. In C. atlantica, sex allocation to male and female functions is highly variable and Krouchi et al (2004) have found that this variation is stable at least across several years. From an evolutionary perspective, such a tendency to dioecy in trees can be interpreted in the light of ID avoidance (Scofield and Schultz, 2006).…”

Section: Selfing Rate and Inbreeding Depression In Cedrusmentioning

confidence: 99%

“…However, other mechanisms, such as dichogamy, also determine the individual selfing rate. One feature of the monoecious Atlas cedar, Cedrus atlantica Manetti, is a continuous variation of male/female allocation to reproduction among individuals, which ranges from quasi-male trees to quasi-female trees and everything in between (Krouchi et al, 2004). In such situations, both demographic and biological features may affect the mating system.…”

Section: Introductionmentioning

confidence: 99%

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Variation of selfing rate and inbreeding depression among individuals and across generations within an admixed Cedrus population

2010

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We investigated the variation and short-term evolution of the selfing rate and inbreeding depression (ID) across three generations within a cedar forest that was established from admixture ca 1860. The mean selfing rate was 9.5%, ranging from 0 to 48% among 20 seed trees (estimated from paternally inherited chloroplast DNA). We computed the probability of selfing for each seed and we investigated ID by comparing selfed and outcrossed seeds within progenies, thus avoiding maternal effects. In all progenies, the germination rate was high (88-100%) and seedling mortality was low (0-12%). The germination dynamics differed significantly between selfed and outcrossed seeds within progenies in the founder gene pool but not in the following generations. This transient effect of selfing could be attributed to epistatic interactions in the original admixture. Regarding the seedling growth traits, the ID was low but significant: 8 and 6% for height and diameter growth, respectively. These rates did not vary among generations, suggesting minor gene effects. At this early stage, outcrossed seedlings outcompeted their selfed relatives, but not necessarily other selfed seedlings from other progenies. Thus, purging these slightly deleterious genes may only occur through within-family selection. Processes that maintain a high level of genetic diversity for fitness-related traits among progenies also reduce the efficiency of purging this part of the genetic load.

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Spatially explicit assessment of genetic variation to inform conservation effort for an endangered Mediterranean conifer,Cedrus atlantica

Bobo‐Pinilla

Nieto‐Lugilde

Terrab

et al. 2022

Ecology and Evolution

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Preserving the genetic diversity of forest species is critical for maintaining their adaptive potential and allowing for generation turnover in forest ecosystems. Considering an uncertain future, it is necessary to establish reliable genetic conservation strategies to optimize the genetic variation preserved within populations in a spatially explicit context to assist decision‐makers. Hence, we aimed to incorporate genetic information into spatially designed conservation actions. Cedrus atlantica is a large, long‐lived conifer native to the mountains of North Africa, threatened by extinction. The relevant genetic units for conservation were selected using Bayesian analysis. The relative contribution of the populations to the genetic pool that maximized the species' genetic diversity was calculated to design an optimal seed bank. Finally, the relationship between the genetic composition and bioclimatic variables was estimated and projected throughout the study area under current and future climatic conditions. Three relevant genetic units were found for C. atlantica conservation that maximizes genetic diversity in a spatial context. Bioclimatic variables with the highest influence on genetic composition were closely related to climate warming and decreased soil water availability. We identified the role of genetic markers in designing a reliable conservation strategy for forest trees considering climate change, increased deforestation, and aridity. Projections of genetic composition due to the climate in the study region of North Africa provide spatially explicit guidance for optimizing the selection and preservation of seed banks.

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Year and tree effect on reproductive organisation of Cedrus atlantica in a natural forest

Cited by 34 publications

References 24 publications

Considering evolutionary processes in adaptive forestry

Considering evolutionary processes in adaptive forestry

Variation of selfing rate and inbreeding depression among individuals and across generations within an admixed Cedrus population

Spatially explicit assessment of genetic variation to inform conservation effort for an endangered Mediterranean conifer,Cedrus atlantica

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