The Influence of Self-Fertilization and Population Dynamics on the Genetic Structure of Subdivided Populations: A Case Study Using Microsatellite Markers in the Freshwater Snail Bulinus truncatus

Evolution ◽  
1997 ◽  
Vol 51 (5) ◽  
pp. 1518 ◽  
Author(s):  
F. Viard ◽  
F. Justy ◽  
P. Jarne
Keyword(s):  
Population Dynamics ◽  
Genetic Structure ◽  
Microsatellite Markers ◽  
Freshwater Snail ◽  
Bulinus Truncatus ◽  
Subdivided Populations ◽  
Self Fertilization

scholarly journals Do self-fertilization and genetic drift promote a very low genetic variability in the allotetraploid Bulinus truncatus (Gastropoda: Planorbidae) populations?

1993 ◽  
Vol 62 (2) ◽  
pp. 89-100 ◽  
Author(s):  
Flobert Njiokou ◽  
Christian Bellec ◽  
Patrick Berrebi ◽  
Bernard Delay ◽  
Philippe Jarne
Keyword(s):  
Genetic Drift ◽  
Freshwater Snail ◽  
Snail Species ◽  
Intermediate Hosts ◽  
Bulinus Truncatus ◽  
Genetic Structure Of Populations ◽  
Self Fertilization ◽  
High Gene ◽  
Almost All

SummaryBulinus truncatus, one of the intermediate hosts of the genus Schistosoma is an hermaphrodite freshwater snail species occupying a variety of environments over almost all Africa. These environments are subjected to large variations in water availability. B. truncatus is allotetraploid and its populations exhibit various frequencies of aphallic individuals (unable to reproduce as male). Both traits probably favour a reproduction by self-fertilization. Here we investigate the genetic structure of populations of B. truncatus of Niger and Ivory Coast using protein electrophoresis to analyse the influence of the environment and of both the last traits. To obtain an estimate of the true heterozygosity in this allotetraploid species, we analyse independently the two diploid loci at each tetraploid locus. Our study indicates (i) an extremely low intrapopulation polymorphism with most alleles fixed and the total absence of heterozygotes and (ii) low differentiation between populations. These results indicate high gene flow between populations. However, the existence of private alleles sometimes at high frequency, the low polymorphism and the lack of heterozygotes point to the role of both genetic drift and self-fertilization, the second amplifying the genetic consequences of the first.

A Problem with the Estimate of Self-Fertilization Depression in the Hermaphrodite Freshwater Snail Bulinus truncatus: The Effect of Grouping

Evolution ◽  
1994 ◽  
Vol 48 (2) ◽  
pp. 498 ◽  
Author(s):  
Claudie Doums ◽  
Bernard Delay ◽  
Philippe Jarne
Keyword(s):  
Freshwater Snail ◽  
Bulinus Truncatus ◽  
Self Fertilization

Population Dynamics Inferred From Temporal Variation at Microsatellite Loci in the Selfing Snail Bulinus truncatus

Genetics ◽  
1997 ◽  
Vol 146 (3) ◽  
pp. 973-982
Author(s):  
Frédérique Viard ◽  
Fabienne Justy ◽  
Philippe Jarne
Keyword(s):  
Genetic Parameters ◽  
Freshwater Snail ◽  
Demographic Model ◽  
Short Term ◽  
Bulinus Truncatus ◽  
Annual Cycles ◽  
Temporary Habitats ◽  
Subdivided Populations ◽  
Dry Out ◽  
Limited Change

We analyzed short-term forces acting on the genetics of subdivided populations based on a temporal survey of the microsatellite variability in the hermaphrodite freshwater snail Bulinus truncatus. This species inhabits temporary habitats, has a short generation time and exhibits variable rates of selfing. We studied the variability over three sampling dates in 12 Sahelian populations (1161 individuals). Classical genetic parameters (estimators of Ho, He, f selfing rate and Fst) showed limited change over time whereas important temporal changes of allelic frequencies were detected for 10 of the ponds studied. These variations are not easily explained by selection, sampling drift and genetic drift alone and may be due to periodic migration. Indeed the habitats occupied by the populations studied are subject to large temporal fluctuations owing to annual cycles of drought and flood. In such ponds our results support a demographic model of population expansions and contractions under which available habitats, after the rainy season, are colonized by individuals originating from a smaller number of refuges (areas that never dry out in the deepest parts of the ponds). In contrast, selfing appeared to be an important force affecting the genetic structure in permanent ponds.

scholarly journals Microsatellites and the Genetics of Highly Selfing Populations in the Freshwater Snail Bulinus truncatus

Genetics ◽  
1996 ◽  
Vol 142 (4) ◽  
pp. 1237-1247 ◽  
Author(s):  
Frédérique Viard ◽  
Philippe Bremond ◽  
Rabiou Labbo ◽  
Fabienne Justy ◽  
Bernard Delay ◽  
...  
Keyword(s):  
Microsatellite Markers ◽  
Gene Diversity ◽  
Natural Populations ◽  
Freshwater Snail ◽  
Allozyme Polymorphism ◽  
Good Opportunity ◽  
Bulinus Truncatus ◽  
Linkage Disequilibria ◽  
Limited Gene Flow ◽  
Different Populations

Abstract Hermaphrodite tropical freshwater snails provide a good opportunity to study the effects of mating system and genetic drift on population genetic structure because they are self-fertile and they occupy transient patchily distributed habitats (ponds). Up to now the lack of detectable allozyme polymorphism prevented any intrapopulation studies. In this paper, we examine the consequences of selfing and bottlenecks on genetic polymorphism using microsatellite markers in 14 natural populations (under a hierarchical sampling design) of the hermaphrodite freshwater snail Bulinus truncatus. These population genetics data allowed us to discuss the currently available mutation models for microsatellite sequences. Microsatellite markers revealed an unexpectedly high levels of genetic variation with ≤41 alleles for one locus and gene diversity of 0.20–0.75 among populations. The values of any estimator of F  is, indicate high selfing rates in all populations. Linkage disequilibria observed at all loci for some populations may also indicate high levels of inbreeding. The large extent of genetic differentiation measured by F  st, R  st or by a test for homogeneity between genic distributions is explained by both selfing and bottlenecks. Despite a limited gene flow, migration events could be detected when comparing different populations within ponds.

scholarly journals A PROBLEM WITH THE ESTIMATE OF SELF-FERTILIZATION DEPRESSION IN THE HERMAPHRODITE FRESHWATER SNAIL BULINUS TRUNCATUS : THE EFFECT OF GROUPING

Evolution ◽  
1994 ◽  
Vol 48 (2) ◽  
pp. 498-504
Author(s):  
Claudie Doums ◽  
Bernard Delay ◽  
Philippe Jarne
Keyword(s):  
Freshwater Snail ◽  
Bulinus Truncatus ◽  
Self Fertilization

Analysis of genetic structure and growth traits inBarbus capitousing microsatellite markers

2013 ◽  
Vol 37 (8) ◽  
pp. 1121
Author(s):  
Cuiyun LU ◽  
Longwu GENG ◽  
Chao LI ◽  
Lei CHENG ◽  
Xiaowen SUN ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Microsatellite Markers ◽  
Growth Traits

scholarly journals Individual-based modelling of resource competition to predict density-dependent population dynamics: a case study with white storks

Oikos ◽  
2014 ◽  
Vol 124 (3) ◽  
pp. 319-330 ◽  
Author(s):  
Damaris Zurell ◽  
Ute Eggers ◽  
Michael Kaatz ◽  
Shay Rotics ◽  
Nir Sapir ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Resource Competition ◽  
Density Dependent ◽  
White Storks

scholarly journals Genetic structure and molecular divergence among samples of mandacaru (Cereus spp.; Cactaceae) as revealed by microsatellite markers

2016 ◽  
Vol 64 ◽  
pp. 38-45 ◽  
Author(s):  
Vanessa Neves de Azevedo Fernandes ◽  
Andréa Florindo das Neves ◽  
Paula Garcia Martin ◽  
Claudete Aparecida Mangolin ◽  
Maria de Fátima P.S. Machado
Keyword(s):  
Genetic Structure ◽  
Microsatellite Markers ◽  
Molecular Divergence
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