Variación genética en poblaciones mexicanas de  Swietenia macrophylla  King, una especie tropical en expansión geográfica reciente.

Trujillo-Sierra, José Enrique; Delgado-Valerio, Patricia; Ramírez‐Morillo, Ivón M.; Rebolledo-Camacho, Virginia; Pérez-Nasser, Y Nidia

doi:10.17129/botsci.10

Cited by 5 publications

(6 citation statements)

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“…Overall, our results were similar to those reported for other Mexican populations of Swietenia macrophylla sampled within the Yucatan peninsula and analyzed with microsatellite loci. For example, Trujillo-Sierra et al (2013) reported from 21 to 26 alleles per population (29 alleles in total), whereas 25 alleles were reported in this study (in the group of adults for comparison). Mean values of the observed heterozygosity (H O ) of 0.420 and 0.410 has been reported respectively by Trujillo-Sierra et al (2013) and by Alcalá et al (2014), which coincide with our estimate of 0.451.…”

Section: Discussioncontrasting

confidence: 70%

“…For example, Trujillo-Sierra et al (2013) reported from 21 to 26 alleles per population (29 alleles in total), whereas 25 alleles were reported in this study (in the group of adults for comparison). Mean values of the observed heterozygosity (H O ) of 0.420 and 0.410 has been reported respectively by Trujillo-Sierra et al (2013) and by Alcalá et al (2014), which coincide with our estimate of 0.451. These two studies also showed a statistically signifi - cant deviation of the genotypic frequencies, revealing a high coeffi cient of fi xation (0.309 and 0.449, respectively).…”

Section: Discussioncontrasting

confidence: 70%

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Genetic structure and genetic diversity of <em>Swietenia macrophylla</em> in areas subjected to selective logging in Quintana Roo, Mexico

2015

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Abstract:The hypothesis that selective logging has a negative effect by altering the genetic parameters of tropical tree species was evaluated. The genetic diversity and genetic structure between adult trees (N = 47) and saplings (N = 50) of Swietenia macrophylla were contrasted within an area subjected to selective logging in the Mayan zone. Although differences in the number of alleles and in their frequencies were detected between both groups, the observed and expected heterozygosity and the coeffi cient of fi xation were statistically similar. Evidence of higher genetic structure in the group of saplings was revealed by both, the autocorrelation and the factor correspondence analyses. The genetic differences observed in this study are compatible with those expected under scenarios of disruption in the local pattern of gene fl ow produced by selective logging. The implication of these results on the conservation genetics of Swietenia macrophylla in the Mayan zone is discussed. Keywords: autocorrelation analysis, big-leaf mahogany, conservation genetics, Moran's index, tropical timber species.Resumen: Se evaluó la hipótesis de que la tala selectiva genera un efecto negativo alterando los parámetros genéticos de las especies de árboles tropicales. Se contrastó la diversidad genética y la estructura genética entre árboles adultos (N = 47) e individuos juveniles (N = 50) de Swietenia macrophylla en una zona sujeta a la tala selectiva en la zona maya. Aunque se detectaron diferencias entre ambos grupos de árboles en el número de alelos y en sus frecuencias, la heterocigosis observada y la esperada, y el coefi ciente de fi jación fueron estadísticamente similares. Análisis de autocorrelación espacial y factorial de correspondencias mostraron una mayor estructura genética en el grupo de individuos juveniles. Las diferencias genéticas observadas en este estudio son compatibles con las esperadas bajo escenarios de perturbación en el patrón local del fl ujo de genes producto de la tala selectiva. Se discute la implicación de estos resultados en la conservación genética de Swietenia macrophylla en la zona maya. Palabras clave: análisis de autocorrelación espacial, caoba de hoja grande, conservación genética, especies tropicales maderables, índice de Morán.

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Section: Discussioncontrasting

confidence: 70%

Section: Discussioncontrasting

confidence: 70%

Genetic structure and genetic diversity of <em>Swietenia macrophylla</em> in areas subjected to selective logging in Quintana Roo, Mexico

2015

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“…Although the current forest management model incorporates the concept of reduced impact logging (RIL), it has been criticized for promoting the reproductive isolation of species and favoring non-random mating, which may contribute to increases in inbreeding and lead to genetic erosion. This is particularly this case for species such as S. macrophylla that generally present a low density (< 1 tree/ha) in natural populations (André et al, 2008;Sebbenn et al, 2008;Lacerda et al, 2013;Trujillo-Sierra et al, 2013;Alcalá et al, 2015). Genetic studies have reported that S. macrophylla has high levels of genetic diversity and differentiation among populations in areas without logging (Lemes et al, 2003;Degen et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Genetic studies have reported that S. macrophylla has high levels of genetic diversity and differentiation among populations in areas without logging (Lemes et al, 2003;Degen et al, 2013). Although the species may be self-incompatible (Bawa et al, 1985), studies based on genetic markers as microsatellite loci have reported a loss of genetic diversity and increased inbreeding as a result of forest fragmentation and logging of its natural habitat (André et al, 2008;Sebbenn et al, 2012;Breed et al, 2012;Degen et al, 2013;Trujillo-Sierra et al, 2013). The juveniles assigned with estimates of genetic diversity and structure, inbreeding, pollen dispersal, and mating patterns can be used as additional measures to inform sustainable forest management practices and help to understand the impacts of forest management on the spatial genetic structure (SGS) of managed species (Gillies et al, 1999;Lourmas et al, 2007;Sebbenn et al, 2012;Baldauf et al, 2013;Degen et al, 2013;Lacerda et al, 2013;Vinson et al, 2015Vinson et al, , 2018Arruda et al, 2015;Dal Bem et al, 2015;Duminil et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Using spatial genetic structure of a population of Swietenia macrophylla King to integrate genetic diversity into management strategies in Southwestern Amazon

Oliveira

Campos

Sebbenn

et al. 2020

Forest Ecology and Management

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The aims of this study were to investigate the intrapopulation spatial genetic structure (SGS) of a preserved Swietenia macrophylla population in a managed forest in Southwestern Amazon, in Acre state, Brazil, and assess the genetic parameters that underlie the conceptual framework that guides conservation and management strategies. The study was conducted in Annual Production Unit (APU) 3, where 83 adult trees (DBH ≥ 40 cm) were mapped (1650 ha). The diameter at breast height (DBH) was measured and the vascular exchange was sampled. Leaf tissues were collected from 187 juvenile individuals within a radius of 20 m of adults. The population presented high heterozygosity (H o ) for adult (0.767) and juvenile (0.763) individuals, but significantly high allelic richness (R) and significantly lower fixation index (F ) in adults (R = 10.3, F = 0.048) than juveniles (R = 9.3, F = 0.119). The F value significantly higher for juveniles, suggesting selection against inbred individuals between juvenile and adult life stages. SGS was detected for adults up to 300 m. Mating was mainly through outcrossing (0.97-1.0), but some crossing occurred among related trees (0.02-0.16) and were correlated (r pm = 0.06-0.22), indicating a mean effective number of pollen donors ranging from 4.5 to 18.2. Pollen dispersal distances reached 3905 m (mean of 1472 m), and mean effective pollination neighbor area of 792 ha. The effective population size (N e ) within family (2.73) was lower than expected for random mating populations. The number of trees (m) required for seed collection was estimated at 55 non-inbreed and not related trees to each other. The core collection consisted of 42 (50.6%) adults across the area. These individuals should be included in seed collection as they represent 100% of the total detected genetic diversity. The inclusion of S. macrophylla on the list of species available for exploitation is not indicated, because the species requires cross breeding for its maintenance and logging reduce the N e and may negatively impact the pattern of genetic diversity. These will significantly increase the risk of genetic erosion and population extinction due to a lack of adaptive ability. Adults serve as pollen donors that ecologically and genetically contribute to the maintenance of gene flow and N e . Because it is recognized as a threatened species worldwide, and due to the fact that in areas of natural occurrence the species presents low-density and shows difficulty establishing natural regeneration, we recommend that S. macrophylla be protected from selective logging.

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“…Los datos obtenidos sugieren que existe una diferenciación genética alta (Fst = 0,419), lo cual concuerda con otros estudios realizados en C. odorata en Costa Rica y Perú donde han reportado una alta diferenciación genética entre poblaciones (Gillies et al 1997, De la Torre et al 2008, así como niveles de diversidad altos (Cavers et al 2003). Para la especie de la misma familia Swietenia macrophylla, que también ha sufrido sobreexplotación, se reporta una variación genética moderada (He = 0,600) aunque un nivel de endogamia alto y significativo (Fis = 0,309) y una diferenciación genética baja pero significativa con una Fst de 0,095 (Trujillo-Sierra et al 2013). En los resultados del presente estudio se obtuvo un nivel de endogamia similar al trabajo anterior (Fis = 0,306), aunque con una variación genética baja (He = 0,261), en contraste a lo reportado por otros autores en donde la heterocigosidad esperada indicó una variación genética alta (He = 0,820 Figura 1.…”

Section: Discussionunclassified

Diversidad genética del cedro rojo ( Cedrela odorata ) en el estado de Tabasco, México

et al. 2018

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The red cedar (Cedrela odorata) is a valuable timber species. It is currently listed as a protected species, as well as on the IUCN red list due to the decline of its wild populations mainly due to habitat fragmentation and deforestation. The aim of the present study was to estimate the structure and genetic diversity of red cedar populations in the state of Tabasco, Mexico. Sixty eight samples of C. odorata from the states of Tabasco and Chiapas were analyzed. The DNA was extracted with the CTAB method (cetyl trimethyl ammonium bromide). DNA amplification was performed using 10 microsatellite loci (SSRs), nine of them previously reported as polymorphic for the species and one designed (AB0507) with the program Primer 3. For the analysis of the resulting data, NTsys, GenAlex and Cervus pc programs were used. Genetic differentiation was high (Fst = 0.419) and genetic diversity was low (Ho = 0.297). Compared with other studies, it showed less genetic diversity of the species, indicating superior genetic erosion, presently. With this study, it is possible to suggest more suitable populations for the extraction of germplasm and, thus, counteract the loss of genetic diversity of this species in the region.

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Variación genética en poblaciones mexicanas de Swietenia macrophylla King, una especie tropical en expansión geográfica reciente.

Cited by 5 publications

References 56 publications

Genetic structure and genetic diversity of <em>Swietenia macrophylla</em> in areas subjected to selective logging in Quintana Roo, Mexico

Genetic structure and genetic diversity of <em>Swietenia macrophylla</em> in areas subjected to selective logging in Quintana Roo, Mexico

Using spatial genetic structure of a population of Swietenia macrophylla King to integrate genetic diversity into management strategies in Southwestern Amazon

Diversidad genética del cedro rojo ( Cedrela odorata ) en el estado de Tabasco, México

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