Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)

Heterozygote deficiencies in natural populations of outbreeding tree species are common and thought to be due mainly to biparental inbreeding. Inbreeding is believed to be caused by family structure within populations, a product of limited seed dispersal and probably limited pollen dispersal. Althou...

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Autores principales:	Carrasco,Basilio, Eaton,Lafayette, Letelier,Luis, Díaz,Carole, García-Gonzáles,Rolando
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2011
Materias:	Genetic structure spatial structure Raulí spatial autocorrelation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300014
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spelling	oai:scielo:S0718-162020110003000142012-01-23Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)Carrasco,BasilioEaton,LafayetteLetelier,LuisDíaz,CaroleGarcía-Gonzáles,Rolando Genetic structure spatial structure Raulí spatial autocorrelation Heterozygote deficiencies in natural populations of outbreeding tree species are common and thought to be due mainly to biparental inbreeding. Inbreeding is believed to be caused by family structure within populations, a product of limited seed dispersal and probably limited pollen dispersal. Although both theory and simulation studies predict that structure should be apparent where trees are isolated by distance, most studies of structure in natural populations have detected only a weak spatial genetic structuring. In this contribution, we compare the use of spatial autocorrelation methodology and F statistics with the concept of relatedness to examine the spatial genetic structure in the natural population of a native southern beech and to explore the discrepancy between theory and observations. Autocorrelation detected structure in only a few of the nine enzyme loci tested in an estimated patch size of approximately 10 m. By successively eliminating the largest distances in the Gabriel map, the population was separated into groups or patches of neighbors, which were then tested for relatedness. Three groups of relatives were found interspersed with seven groups of unrelated individuals. The F statistics for these groups also showed weak genetic structure. We suggest that heterogeneity of family structure within natural populations may be one reason why more spatial genetic structure has not been detected.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.38 n.3 20112011-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300014en10.4067/S0718-16202011000300014
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Genetic structure spatial structure Raulí spatial autocorrelation
spellingShingle	Genetic structure spatial structure Raulí spatial autocorrelation Carrasco,Basilio Eaton,Lafayette Letelier,Luis Díaz,Carole García-Gonzáles,Rolando Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
description	Heterozygote deficiencies in natural populations of outbreeding tree species are common and thought to be due mainly to biparental inbreeding. Inbreeding is believed to be caused by family structure within populations, a product of limited seed dispersal and probably limited pollen dispersal. Although both theory and simulation studies predict that structure should be apparent where trees are isolated by distance, most studies of structure in natural populations have detected only a weak spatial genetic structuring. In this contribution, we compare the use of spatial autocorrelation methodology and F statistics with the concept of relatedness to examine the spatial genetic structure in the natural population of a native southern beech and to explore the discrepancy between theory and observations. Autocorrelation detected structure in only a few of the nine enzyme loci tested in an estimated patch size of approximately 10 m. By successively eliminating the largest distances in the Gabriel map, the population was separated into groups or patches of neighbors, which were then tested for relatedness. Three groups of relatives were found interspersed with seven groups of unrelated individuals. The F statistics for these groups also showed weak genetic structure. We suggest that heterogeneity of family structure within natural populations may be one reason why more spatial genetic structure has not been detected.
author	Carrasco,Basilio Eaton,Lafayette Letelier,Luis Díaz,Carole García-Gonzáles,Rolando
author_facet	Carrasco,Basilio Eaton,Lafayette Letelier,Luis Díaz,Carole García-Gonzáles,Rolando
author_sort	Carrasco,Basilio
title	Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
title_short	Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
title_full	Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
title_fullStr	Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
title_full_unstemmed	Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)
title_sort	heterogeneous genetic structure in a natural population of raulí (nothofagus nervosa)
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000300014
work_keys_str_mv	AT carrascobasilio heterogeneousgeneticstructureinanaturalpopulationofraulinothofagusnervosa AT eatonlafayette heterogeneousgeneticstructureinanaturalpopulationofraulinothofagusnervosa AT letelierluis heterogeneousgeneticstructureinanaturalpopulationofraulinothofagusnervosa AT diazcarole heterogeneousgeneticstructureinanaturalpopulationofraulinothofagusnervosa AT garciagonzalesrolando heterogeneousgeneticstructureinanaturalpopulationofraulinothofagusnervosa
_version_	1714202135409721344

Heterogeneous genetic structure in a natural population of Raulí (Nothofagus nervosa)

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