Pollen- Versus Seed-Mediated Gene Flow in a Scattered Forest Tree Species

Oddou‐Muratorio, Sylvie; Petit, Rémy J.; Guerroué, Bénédicte Le; Guesnet, D.; Demesure, Brigitte

doi:10.1554/0014-3820(2001)055[1123:pvsmgf]2.0.co;2

Cited by 54 publications

(103 citation statements)

References 41 publications

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“…Current modeling techniques, however, likely underestimate seed dispersal distances because they assume seeds in traps arrive from the nearest adult tree. Models also fail to adequately account for long-distance seed input that may play a substantial role in spatial genetic processes (Oddou-Muratorio et al, 2001), as well as individual variability in fecundity and survivorship (Godoy and Jordano, 2001). Perhaps most importantly for the present study, the current models fail to incorporate dioecy and thus underestimate seed dispersal because any reproductive size adult is considered a potential seed donor.…”

Section: Discussionmentioning

confidence: 81%

Spatial genetic structure of Simarouba amara Aubl. (Simaroubaceae), a dioecious, animal-dispersed Neotropical tree, on Barro Colorado Island, Panama

et al. 2005

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Simarouba amara (Simaroubaceae) is a vertebrate-dispersed, insect-pollinated Neotropical tree found in lowland moist forest from upper Mesoamerica to the Amazon basin. We assessed the spatial genetic structure of S. amara within the 50-ha Forest Dynamics Plot on Barro Colorado Island in the Republic of Panama. A total of 300 individuals were genotyped using five microsatellite loci, representing 100 individuals with a dbhX10 cm, 100 individuals of 1-10 cm dbh, and 100 individuals of o1 cm dbh. The 200 individuals in the two larger size classes were also genotyped with 155 AFLP loci. Spatial autocorrelation analysis using Moran's Index detected significant genotypic association at the smallest distance classes for 1-10 cm dbh (0-20 m) and 410 cm dbh (0-40 m) size categories. Significant spatial autocorrelations were detected over larger scales (0-140 m) in o1 cm dbh individuals. The relatively weak genetic structure of S. amara, in comparison to other recent studies, may be explained by pollen and seed dispersal over the 50 ha plot, overlapping seed shadows, and postrecruitment mortality. Heredity (2005) 95, 290-297.

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Section: Discussionmentioning

confidence: 81%

Spatial genetic structure of Simarouba amara Aubl. (Simaroubaceae), a dioecious, animal-dispersed Neotropical tree, on Barro Colorado Island, Panama

et al. 2005

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“…This contrast is also clearly seen in our survey data with population differentiation for maternally inherited markers being strongly elevated compared to biparentally and paternally inherited marker based estimates of differentiation ( Table 1). The dominance of gene flow through pollen over that via seeds allows to use the former as an approximation for total gene flow, although there are exceptions to this pattern as observed for Sorbus torminalis [71], in which pollen did not dominate gene flow, or for an isolated population of Fraxinus excelsior, in which seed-mediated gene flow exceeded the pollen-mediated component [72]. Modes of dispersal appear to influence gene flow in trees (and woody plant species) as seen from patterns of population genetic differentiation.…”

Section: The Relative Importance Of Seeds and Pollen For Gene Flowmentioning

confidence: 99%

Potential Population Genetic Consequences of Habitat Fragmentation in Central European Forest Trees and Associated Understorey Species—An Introductory Survey

Dobeš¹,

Konrad²,

Geburek³

2017

Diversity

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Abstract:Habitat fragmentation threatens the maintenance of genetic diversity of affected populations. Assessment of the risks associated with habitat fragmentation is a big challenge as the change in population genetic diversity is a dynamic process, often acting over long time periods and depending on various characteristics pertaining to both species (life history traits) and their populations (extrinsic characteristics). With this survey, we provide an introductory overview for persons who have to make or are interested in making predictions about the fate of forest-dwelling plant populations which have recently become fragmented and isolated from their main occurrences. We provide a concise introduction to the field of population genetics focusing on terms, processes and phenomena relevant to the maintenance of genetic diversity and vitality of plant populations. In particular the antagonistic effects of gene flow and random genetic drift are covered. A special chapter is devoted to Central European tree species (including the Carpathians) which we treat in detail with reference to an extensive literature survey on population genetic studies assembled from the whole of Europe. We further provide an overview of the population biology of associated understorey species. We conclude with recommended steps to be taken for the evaluation of potential perils of habitat fragmentation or population thinning for the genetics of tree populations. The complexity of effects exerted by life history traits and extrinsic characteristics of populations suggest population genetic development is strongly situation dependent. Therefore, we recommend following a case-by-case approach ideally supported by computer simulations to predict future population genetic development of both trees and associated understorey species.

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“…A high level of differentiation between populations can be explained also by founder effect. Populations of S. torminalis are characterized by metapopulation dynamics, they undergo frequent extinction and subsequent recolonization (Demesure et al 2000;Oddou-Muratorio et al 2001;Angelone et al 2007). In such cases, the number of individuals involved in the founding effect and the number of populations from which they come from is the crucial factor influencing genetic differentiation between young populations (Wade & McCauley 1988).…”

Section: Resultsmentioning

confidence: 99%

“…S. torminalis is known to form hybrids with S. aria, designated as S. latifolia, which are generally diploid, sexual and able of backcrossing (Aas et al 1994;Nelson-Jones et al 2002). However, hybridization is generally unidirectional (S. aria as the pollen donor), hybrids are morphologically distinguishable and the backcrosses tend to reBrought to you by | MIT Libraries Authenticated Download Date | 5/12/18 4:19 AM semble more S. aria (Aas et al 1994;Oddou-Muratorio et al 2001;Chester et al 2007), so that introgression seems to be very improbable cause of the occurrence of populations not fitting into general geographic patterns.…”

Section: Resultsmentioning

confidence: 99%

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Genetic differentiation of Sorbus torminalis in Eastern Europe as determined by microsatellite markers

et al. 2010

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The genetic variation in fourteen Sorbus torminalis (L.) Crantz. populations distributed over the eastern and south-eastern part of its range was studied using seven nuclear microsatellite loci. The differentiation level was relatively high (FST = 0.228), as expected for a species with a fragmented range. The distance-based approach to the analysis of differentiation patterns (neighbour-joining tree based on pairwise coefficients of differentiation) did not reveal a clear geographical structure. On the other hand, model-based Bayesian methods (BAPS and STRUCTURE) gave geographically continuous clusters of populations. The occurrence of populations deviating strongly from the general pattern is attributed to founder effect. In spite of a generally high differentiation, a significant isolation-by-distance pattern was found, which might be a consequence of postglacial migration and gene flow among descendants of different refugia.

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Pollen- Versus Seed-Mediated Gene Flow in a Scattered Forest Tree Species

Cited by 54 publications

References 41 publications

Spatial genetic structure of Simarouba amara Aubl. (Simaroubaceae), a dioecious, animal-dispersed Neotropical tree, on Barro Colorado Island, Panama

Spatial genetic structure of Simarouba amara Aubl. (Simaroubaceae), a dioecious, animal-dispersed Neotropical tree, on Barro Colorado Island, Panama

Potential Population Genetic Consequences of Habitat Fragmentation in Central European Forest Trees and Associated Understorey Species—An Introductory Survey

Genetic differentiation of Sorbus torminalis in Eastern Europe as determined by microsatellite markers

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