High genetic diversity and strong spatial genetic structure in Cabralea canjerana (Vell.) Mart. (Meliaceae): implications to Brazilian Atlantic Forest tree conservation

Melo, Arthur Tavares de Oliveira; Coelho, Alexandre Siqueira Guedes; Pereira, Marlei Ferreira; Blanco, Angel José Vieira; Franceschinelli, Edivani Villaron

doi:10.1016/j.ncon.2014.08.001

Cited by 21 publications

(11 citation statements)

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“…The relatively long mean distance of within‐plot pollen dispersal that we observed (500 m) is also in accordance with Lourmas et al. (), who found a mean dispersal distance of 385 m. This capacity for long‐distance dispersal can be explained by the behaviour of pollinator insects (bees) as observed in other Meliaceae species (e.g., Swietenia humilis and Cabralea canjerana ; Melo, Coelho, Pereira, Blanco, & Franceschinelli, ; White, Boshier, & Powell, ). Given the density of mature trees and the long pollen dispersal distance, the degree of connectivity through gene flow might be very high in E. cylindricum .…”

Section: Discussionsupporting

confidence: 92%

Extensive seed and pollen dispersal and assortative mating in the rain forest tree Entandrophragma cylindricum (Meliaceae) inferred from indirect and direct analyses

et al. 2017

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Pollen and seed dispersal are key processes affecting the demographic and evolutionary dynamics of plant species and are also important considerations for the sustainable management of timber trees. Through direct and indirect genetic analyses, we studied the mating system and the extent of pollen and seed dispersal in an economically important timber species, Entandrophragma cylindricum (Meliaceae). We genotyped adult trees, seeds and saplings from a 400-ha study plot in a natural forest from East Cameroon using eight nuclear microsatellite markers. The species is mainly outcrossed (t = 0.92), but seeds from the same fruit are often pollinated by the same father (correlated paternity, r = 0.77). An average of 4.76 effective pollen donors (N ) per seed tree contributes to the pollination. Seed dispersal was as extensive as pollen dispersal, with a mean dispersal distance in the study plot approaching 600 m, and immigration rates from outside the plot to the central part of the plot reaching 40% for both pollen and seeds. Extensive pollen- and seed-mediated gene flow is further supported by the weak, fine-scale spatial genetic structure (Sp statistic = 0.0058), corresponding to historical gene dispersal distances (σ ) reaching approximately 1,500 m. Using an original approach, we showed that the relatedness between mating individuals (F = 0.06) was higher than expected by chance, given the extent of pollen dispersal distances (expected F = 0.02 according to simulations). This remarkable pattern of assortative mating could be a phenomenon of potentially consequential evolutionary and management significance that deserves to be studied in other plant populations.

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Section: Discussionsupporting

confidence: 92%

Extensive seed and pollen dispersal and assortative mating in the rain forest tree Entandrophragma cylindricum (Meliaceae) inferred from indirect and direct analyses

et al. 2017

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“…The independence between genetic kinship and geographic distance matrix was assessed using the Mantel test with 10000 permutations (Sokal 1979) in R software. An analysis was performed in a Geneland (Guillot et al 2005b) R package, according to the F spatial model with two groups (K = 2), as previous reported by Melo et al (2014), to identify the number of genetic groups and geographic boundaries between them. A total of 10000 MCMC interactions and 10 independent runs for each K were used in a Bayesian analysis, considering a burn-in period of 500 steps and sampling frequency of 1 every 100 steps (thinning).…”

Section: Methodsmentioning

confidence: 99%

Gene flow and fine-scale spatial genetic structure inCabralea canjerana(Meliaceae), a common tree species from the Brazilian Atlantic forest

Melo

Franceschinelli

2016

J. Trop. Ecol.

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Abstract:The Atlantic forest is the biome most severely affected by deforestation in Brazil. Cabralea canjerana spp. canjerana is a dioecious tree species with widespread distribution in the Neotropical region. This species is considered a model to ascertain population ecology parameters for endangered plant species from the Atlantic forest. Fine-scale spatial genetic structure and pollen-mediated gene flow are crucial information in landscape genetics and evolutionary ecology. A total of 192 adults and 121 offspring were sampled in seven C. canjerana populations in the Southern Minas Gerais State, Brazil, to assess whether pollen-mediated gene flow is able to prevent spatial genetic structure within and among Atlantic forest fragments. Several molecular ecology parameters were estimated using microsatellite loci. High levels of genetic diversity (HE = 0.732) and moderate population structure (θ = 0.133) were recorded. No significant association between kinship and spatial distance amongst individuals within each population (Sp = 0.000109) was detected. Current pollen-mediated gene flow occurs mainly within forest fragments, probably due to short-distance flights of the pollinator of C. canjerana, and also the forest fragmentation may have restricted flight distance. The high levels of genetic differentiation found amongst the seven sites sampled demonstrated how habitat fragmentation affects the gene flow process in natural areas.

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“…Para variações de altitudes entre 140 e 1.200 m, esses autores encontraram menos diversidade genética em populações situadas em altitudes maiores, concluindo que a variação genética entre as populações tinha sido afetada pela topografia do local. Melo et al (2014), ao estudarem as mesmas populações de C. canjerana na APA Fernão Dias, mostraram que a endogamia intrapopulacional (F IS ) apresentava forte correlação com os valores de densidade populacional. Essa correlação foi significativa, principalmente nas subpopulações maiores, situadas nos contínuos florestais.…”

Section: Esforços Conservacionistasunclassified

GENÉTICA DA CONSERVAÇÃO DE Cabralea canjerana (Vell.) Mart. (Meliaceae) EM FRAGMENTOS FLORESTAIS DE MATA ATLÂNTICA NA APA FERNÃO DIAS

et al. 2015

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RESUMO -A Mata Atlântica é o bioma brasileiro mais severamente afetado pela fragmentação ambiental. A análise da estruturação da diversidade genética, assim como de características demográficas e quantitativas, permite inferir parâmetros populacionais importantes para os programas de conservação de espécies ameaçadas. Cabralea canjerana ssp. canjerana (Meliaceae) é uma espécie arbórea dioica considerada modelo para estudos de conservação da Mata Atlântica. Cento e oitenta e três indivíduos de oito subpopulações de C. canjerana foram coletados em fragmentos florestais na Área de Proteção Ambiental (APA) Fernão Dias, no Sul do Estado de Minas Gerais, Brasil. Utilizando marcadores microssatélites, a diversidade genética foi estimada e contrastada com medidas quantitativas e medidas geográficas dessas oito subpopulações. Elevados níveis de diversidade genética foram encontrados. Uma porção pequena, porém significativa, da variância genética total está estruturada entre as populações (θ = 0,053), que foram estruturadas em dois grupos distintos. As estimativas dos níveis de diversidade genética nas populações localizadas acima de 1.800 m de altitude foram maiores, corroborando a importância dessas populações na manutenção da diversidade genética. A densidade populacional observada também foi maior nos fragmentos de maior altitude (r = 0,849; p-valor = 0,007). Não houve correlação significativa entre as variáveis fenotípicas (altura dos indivíduos e diâmetro a 1,50 m acima do solo) e as medidas de diversidade genética. Esforços conservacionistas para que aumentem o fluxo gênico entre esses fragmentos florestais devem ser estimulados, principalmente entre os fragmentos de baixa altitude e os fragmentos de elevada altitude. É comprovado que populações situadas em elevadas altitudes possuem maior número de indivíduos por hectare e, portanto, maiores índices de diversidade genética. Essas áreas podem ser tratadas como repositório de diversidade genética, e sua manutenção é de extrema importância. O Código Florestal brasileiro determina que essas áreas acima de 1.800 m de altitudes sejam consideradas Áreas de Proteção Permanente (APP).Palavras-chave: Mata Atlântica; Diversidade genética; Conservação biológica. CONSERVATION GENETICS OF Cabralea canjerana (Vell.) Mart. (Meliaceae) IN ATLANTIC FOREST FRAGMENTS OF FERNÃO DIAS EPA

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High genetic diversity and strong spatial genetic structure in Cabralea canjerana (Vell.) Mart. (Meliaceae): implications to Brazilian Atlantic Forest tree conservation

Cited by 21 publications

References 21 publications

Extensive seed and pollen dispersal and assortative mating in the rain forest tree Entandrophragma cylindricum (Meliaceae) inferred from indirect and direct analyses

Extensive seed and pollen dispersal and assortative mating in the rain forest tree Entandrophragma cylindricum (Meliaceae) inferred from indirect and direct analyses

Gene flow and fine-scale spatial genetic structure inCabralea canjerana(Meliaceae), a common tree species from the Brazilian Atlantic forest

GENÉTICA DA CONSERVAÇÃO DE Cabralea canjerana (Vell.) Mart. (Meliaceae) EM FRAGMENTOS FLORESTAIS DE MATA ATLÂNTICA NA APA FERNÃO DIAS

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