Population density and size influence pollen dispersal pattern and mating system of the predominantly outcrossed Banksia nivea (Proteaceae) in a threatened ecological community

2018 ◽  
Vol 124 (3) ◽  
pp. 492-503 ◽  
Author(s):  
R Thavornkanlapachai ◽  
P G Ladd ◽  
M Byrne
Keyword(s):  
Population Density ◽  
Mating System ◽  
Pollen Dispersal ◽  
Ecological Community ◽  
Dispersal Pattern

scholarly journals Relationships between population density, fine-scale genetic structure, mating system and pollen dispersal in a timber tree from African rainforests

Heredity ◽  
2015 ◽  
Vol 116 (3) ◽  
pp. 295-303 ◽  
Author(s):  
J Duminil ◽  
K Daïnou ◽  
D K Kaviriri ◽  
P Gillet ◽  
J Loo ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Population Density ◽  
Mating System ◽  
Pollen Dispersal ◽  
Fine Scale ◽  
Timber Tree

Estimating genetic diversity, mating system and pollen dispersal to inform ex situ conservation of tree Genipa americana L.

2021 ◽  
pp. 1-11
Author(s):  
Marília Freitas de Vasconcelos Melo ◽  
Alexandre Magno Sebbenn ◽  
Bruno Cesar Rossini ◽  
Ana Veruska Cruz da Silva Muniz ◽  
Carlos Jose Rodrigues ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mating System ◽  
Pollen Dispersal ◽  
Ex Situ ◽  
Fixation Index ◽  
Lower Probability ◽  
Dispersal Pattern ◽  
Long Distance ◽  
Dioecious Species ◽  
Seed Collection

Abstract Using microsatellite loci, we assessed the mating system and genetic diversity of the dioecious tropical tree Genipa americana in a natural population (NP) and a progeny test (PT). For NP, we also estimated the paternity correlation within and among fruits and mean pollen dispersal distance. As expected for dioecious species, all offspring originated from outcrossing (t = 1). Mating among relatives (1 − ts) and paternity correlation (rp) were variable among progenies (1 − ts = 0.03–0.19; rp = 0.04–0.40), but greater in NP than in PT. Fixation index (F) was generally significant and lower in adults than in offspring, indicating selection against inbred individuals. Paternity correlation was higher within (0.40) than among (0.26) fruits, indicating a lower effective number of pollen donors (Nep) within (2.5) than among (3.8) fruits. Due to the higher rp in NP, the effective size within progenies (Ne) was lower (2.69) than PT (3.27). The pollen dispersal pattern was strongly leptokurtic, suggesting long-distance pollen dispersal (mean of 179 m). The results show that both populations can be used for seed collection in environmental reforestation programmes; however, considering that PT is structured in maternal progenies, NP is more suitable for seed collection due to the lower probability of mating among related trees.

scholarly journals Evaluating restoration outcomes through assessment of pollen dispersal, mating system and genetic diversity

2020 ◽  
Author(s):  
Melissa A Millar ◽  
David J Coates ◽  
Margaret Byrne ◽  
Siegfried L Krauss ◽  
Justin Jonson ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mating System ◽  
Pollen Dispersal

Diverse yet endangered: pollen dispersal and mating system reveal inbreeding in a narrow endemic plant

2019 ◽  
Vol 12 (2) ◽  
pp. 169-180 ◽  
Author(s):  
Daniele M. Rodrigues ◽  
Caroline Turchetto ◽  
Jacqueline S. Lima ◽  
Loreta B. Freitas
Keyword(s):  
Mating System ◽  
Pollen Dispersal ◽  
Endemic Plant ◽  
Narrow Endemic

Factors affecting pollen dynamics and its importance to pollen contamination: a review

1991 ◽  
Vol 21 (8) ◽  
pp. 1155-1170 ◽  
Author(s):  
F. Di-Giovanni ◽  
P. G. Kevan
Keyword(s):  
Gene Flow ◽  
Pollen Dispersal ◽  
Past Research ◽  
Seed Orchard ◽  
Dispersal Pattern ◽  
Seed Orchards ◽  
Factors Affecting ◽  
Pollen Contamination ◽  
Modelling Techniques ◽  
Natural Stands

Pollen contamination causes major losses to genetic improvement from selection and breeding of "plus" trees in conifer seed orchards. Genetic losses arise by the influx of "wild" conspecific pollen into seed orchards and its deleterious fertilization of superior genetic lines. This review firstly addresses the basis of the problem: pollen, conifer reproduction, and the concept of seed orchard management, especially in regard to reduction of contamination. Secondly, the physical processes of pollen liberation, dispersal, and deposition are described, and examples of previous studies illuminating these phenomena given. Thirdly, past research on measuring pollen dispersal in natural stands and seed orchards in discussed in the light of modelling techniques used to predict these types of dispersal pattern. Work on the other facets of contamination measurement, gene-flow studies, are listed. It is concluded that a detailed study that combines both the physical and gene-flow aspects of pollen dispersal should be initiated to compare and contrast the two methods, and that attempts to model pollen contamination should be sought.

Effect of forest fragmentation and altitude on the mating system of Eucalyptus pauciflora (Myrtaceae)

2013 ◽  
Vol 61 (8) ◽  
pp. 622 ◽  
Author(s):  
Archana Gauli ◽  
René E. Vaillancourt ◽  
Dorothy A. Steane ◽  
Tanya G. Bailey ◽  
Brad M. Potts
Keyword(s):  
Habitat Fragmentation ◽  
Population Density ◽  
Mating System ◽  
Forest Restoration ◽  
Outcrossing Rate ◽  
Self Incompatibility ◽  
Fragmented Populations ◽  
System Parameters ◽  
Key Factor ◽  
Seed Yields

Habitat fragmentation is a key factor causing variation in important mating system parameters in plants, but its effect is variable. We studied mating system variation among 276 native trees from 37 populations of Eucalyptus pauciflora from Tasmania. We assayed 10 microsatellite loci from 1359 open-pollinated progeny from these trees. Across Tasmania the species’ mating system was characterised by a high outcrossing rate (tm = 0.90) but moderate bi-parental inbreeding (tm–ts = 0.16) and moderate correlated paternity (rP = 0.20) in comparison to other eucalypt species. Despite significant differences in outcrossing rate and correlated paternity among populations, this variation was not correlated with fragmentation. Nevertheless, fragmentation was inversely correlated with the number of germinants per gram of seed capsule content. Outcrossing rate had been reported previously to decrease with increasing altitude in mainland populations of E. pauciflora, but this was not the case in Tasmania. However, a small but significant decrease in correlated paternity occurred with increasing altitude and a decrease in bi-parental inbreeding with increasing altitude was evident in fragmented populations only. It is argued that strong, but incomplete self-incompatibility mechanisms may buffer the mating system from changes in population density and pollinators. While seed yields from highly fragmented populations were reduced, in most cases the seed obtained is unlikely to be more inbred than that from non-fragmented populations and, thus, is likely to be as suitable for use in local forest restoration.

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