Genetic structure and genetic diversity of &lt;em&gt;Swietenia macrophylla&lt;/em&gt; in areas subjected to selective logging in Quintana Roo, Mexico

Alcalá, Raúl E.; Cruz, Silvia De la; Gutiérrez-Granados, Gabriel

doi:10.17129/botsci.256

Cited by 5 publications

(8 citation statements)

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“…Low-density populations generally show less structure and often an absence of SGS (Alcalá et al, 2014(Alcalá et al, , , 2015. The observed pattern of genetic structuring in S. macrophylla was mitigated by the long-distance pollination activities of generalist insects.…”

Section: Association Of Genetic Parameters With Forest Managementmentioning

confidence: 93%

“…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%

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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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Section: Association Of Genetic Parameters With Forest Managementmentioning

confidence: 93%

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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show abstract

“…2009 ; Filazzola et al . 2020 ), influencing the strength of FSGS ( Alcalá et al . 2015 ; Chiriboga-Arroyo et al 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Do habitat fragmentation and degradation influence the strength of fine-scale spatial genetic structure in plants? A global meta-analysis

et al. 2023

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As primarily sessile organisms, plants often show a non-random spatial distribution of genotypes over distance. This process known as fine-scale spatial genetic structure (FSGS) has been suggested through systematic reviews to depend on life-form, mating system, and pollen and seed dispersal vectors, while there is no consensus on its behavior due to external factors, such as anthropogenic habitat changes. By conducting a systematic review and global meta-analysis of empirical FSGS studies, we aimed to evaluate how anthropogenic habitat fragmentation and degradation influence the strength of FSGS in plant populations by means of the Sp statistic. Moreover, we tested how pollination and seed dispersal vectors contribute to the variation of the Sp statistic. We retrieved 243 FSGS studies from 1960 to 2020 of which only 65 were informative for the systematic review. Most empirical studies comprised outcrossers (84%) and trees (67%), with few herbs (23%), and scarce annual species (2%). In weighted meta-analyses for 116 plant populations (31 studies), we did not detect significant effects in the magnitude of effect sizes for the Sp statistic among undisturbed, degraded, and fragmented habitats. Results showed significant effects for seed dispersal vectors, but not for pollination. Overall, we observed high variation among the effect sizes (not related to the goodness-of-fit of mixed models) of habitat status, pollination, and seed dispersal categories, which precludes identifying biological trends on the Sp statistic. More empirical studies are needed that contrast multiple plant populations in disturbed vs. undisturbed habitats, and by increasing the taxonomic groups, such as herbs and annual plants.

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“…For instance, canopy openness and changes in plant density can affect the microenvironmental conditions for seedling establishment and seed bank formation (Lobo et al 2007, Anthelme et al 2011, Álvarez-Aquino et al 2005, causing a decrease in late successional trees (Farwig et al 2008, Clark & Covey 2012. Moreover, a reduction of gene dispersal by pollen flow and seed dispersal and the decline in the number of reproductive individuals can decrease genetic diversity (Aguilar et al 2019) and increase the spatial clustering of genetically related individuals at the local scale in a pattern known as fine-scale genetic structure (FSGS) (Degen et al 2006, Ng et al 2009, Alcalá et al 2015. FSGS results from the combination of microevolutionary forces of genetic drift, selection, and adaptation that interact at the local scale (Kalisz et al 2001).…”

mentioning

confidence: 99%

“…Empirical evidence has shown that the intensity and spatial extent of FSGS may primarily depend on intrinsic factors, such as pollination and seed dispersal vectors, plant density, life form, mating system, and life stage (Vekemans & Hardy 2004, Dick et al 2008, Kloss et al 2011, Hoban et al 2014, Gelmi-Candusso et al 2017. However, extrinsic factors, such as habitat disturbance and selective logging may also play an important role (Ismail et al 2012, Hoban et al 2014, Alcalá et al 2015, Kitamura et al 2018. Empirical studies so far have shown contradicting findings.…”

mentioning

confidence: 99%

Fine-scale genetic structure of Magnolia iltisiana in forest regeneration sites with a history of selective logging

2023

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Background: Selective logging is a frequent practice in the Tropical Montane Cloud Forest which can impact forest regeneration and the genetic makeup of successive generations of trees. The spatial clustering of genetically related individuals, fine-scale genetic structure (FSGS), can develop from the reduction of gene dispersal and the decrease in the number of reproductive individuals at the local scale due to selective logging. Questions: In regeneration sites with a history of selective logging, does FSGS differ from a site without such a history? Is FSGS stronger in seedlings and saplings relative to juveniles and adults? Is genetic diversity similar among life stages and sites? Studied species: Magnolia iltisiana an endemic tree. Study site and dates: Sierra de Manantlan Biosphere Reserve, Jalisco, Mexico. 2020. Methods: We evaluated genetic diversity, genetic structure, and FSGS across four life stages (seedlings, saplings, juveniles, and adults) by genotyping 211 individuals with seven nuclear microsatellite loci in two regeneration and one conserved site. Results: We found statistically significant FSGS in the two regeneration sites only for seedlings and saplings, while no evidence of FSGS was detected in the conserved site. No differences in genetic diversity estimates and structure were found among life stages. Conclusions: Our study does not suggest an effect of selective logging on genetic diversity on the contrasted conditions and an FSGS pattern only in the earlier stages of the regeneration sites in M. iltisiana.

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

Cited by 5 publications

References 51 publications

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

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

Do habitat fragmentation and degradation influence the strength of fine-scale spatial genetic structure in plants? A global meta-analysis

Fine-scale genetic structure of Magnolia iltisiana in forest regeneration sites with a history of selective logging

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