Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria....

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Autores principales:	Mori,Edson S, Martins,Dagoberto, Velini,Edivaldo D, Marino,Celso L, Gouvêa,Cantídio F, Leite,Suzi M.M, Camacho,Edwin, Guries,Raymond P
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal 2012
Materias:	Egeria dam isoenzyme genetic distance RAPD reservoir
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200008
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spelling	oai:scielo:S0718-162020120002000082012-10-24Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, BrazilMori,Edson SMartins,DagobertoVelini,Edivaldo DMarino,Celso LGouvêa,Cantídio FLeite,Suzi M.MCamacho,EdwinGuries,Raymond P Egeria dam isoenzyme genetic distance RAPD reservoir The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria. Large, dense populations of Egeria now grow in Jupiá Lake and its tributaries, occasionally blocking hydroelectric turbines. This study is part of a larger project examining environmental changes associated with large dam projects; the research objective of this study was to assess patterns of genetic diversity in Egeria populations growing in Jupiá and Três Irmãos Lakes and their Paraná River tributaries using genetic markers. Forty-two plants of E. najas and 46 of E. densa (for a total of 88 samples) were collected from 13 sites. Genotypes were identified by isoenzymes and Random Amplification of Polymorphic DNA RAPD markers. Using a genetic distance dendrogram we grouped all E. densa plants into one set and all E. najas plants into another set. The plant sample 8a, which presented intermediary morphological characteristics of both species, also presented intermediary genetic characteristics, indicating the possibility that gene introgression between these Egeria species may occur. The creation of Três Irmãos Lake appears to have increased some measures of genetic diversity in Egeria populations by facilitating outcrossing among previously semi-isolated genotypes. Increased migration of large numbers of seeds and vegetative branches of E. densa and E. najas into Jupiá Lake and its tributaries can account for most of the changes in patterning of genetic diversity observed in these populations of Egeria.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería ForestalCiencia e investigación agraria v.39 n.2 20122012-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200008en10.4067/S0718-16202012000200008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Egeria dam isoenzyme genetic distance RAPD reservoir
spellingShingle	Egeria dam isoenzyme genetic distance RAPD reservoir Mori,Edson S Martins,Dagoberto Velini,Edivaldo D Marino,Celso L Gouvêa,Cantídio F Leite,Suzi M.M Camacho,Edwin Guries,Raymond P Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
description	The aquatic plant species Egeria densa (Planch.) Casp and E. najas Planchon occur naturally in the Paraná River Basin of southeastern Brazil. Hydroelectric dam construction in the river basin has created several lakes, changing the ecology of the river and altering the population ecology of Egeria. Large, dense populations of Egeria now grow in Jupiá Lake and its tributaries, occasionally blocking hydroelectric turbines. This study is part of a larger project examining environmental changes associated with large dam projects; the research objective of this study was to assess patterns of genetic diversity in Egeria populations growing in Jupiá and Três Irmãos Lakes and their Paraná River tributaries using genetic markers. Forty-two plants of E. najas and 46 of E. densa (for a total of 88 samples) were collected from 13 sites. Genotypes were identified by isoenzymes and Random Amplification of Polymorphic DNA RAPD markers. Using a genetic distance dendrogram we grouped all E. densa plants into one set and all E. najas plants into another set. The plant sample 8a, which presented intermediary morphological characteristics of both species, also presented intermediary genetic characteristics, indicating the possibility that gene introgression between these Egeria species may occur. The creation of Três Irmãos Lake appears to have increased some measures of genetic diversity in Egeria populations by facilitating outcrossing among previously semi-isolated genotypes. Increased migration of large numbers of seeds and vegetative branches of E. densa and E. najas into Jupiá Lake and its tributaries can account for most of the changes in patterning of genetic diversity observed in these populations of Egeria.
author	Mori,Edson S Martins,Dagoberto Velini,Edivaldo D Marino,Celso L Gouvêa,Cantídio F Leite,Suzi M.M Camacho,Edwin Guries,Raymond P
author_facet	Mori,Edson S Martins,Dagoberto Velini,Edivaldo D Marino,Celso L Gouvêa,Cantídio F Leite,Suzi M.M Camacho,Edwin Guries,Raymond P
author_sort	Mori,Edson S
title	Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
title_short	Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
title_full	Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
title_fullStr	Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
title_full_unstemmed	Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil
title_sort	genetic diversity in egeria densa and e. najas in jupiá reservoir, brazil
publisher	Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200008
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Genetic diversity in Egeria densa and E. najas in Jupiá Reservoir, Brazil

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