Genetic diversity and differentiation of yellowwood [Cladrastis kentukea (Dum.Cours.) Rudd] growing in the wild and in planted populations outside the natural range

LaBonte, Nicholas R.; Tonos, Jadelys; Hartel, Colleen; Woeste, Keith

doi:10.1007/s11056-017-9566-8

Cited by 8 publications

(8 citation statements)

References 29 publications

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“…2014; Labonte et al. 2017). Our findings reflect that there are effective approaches (i.e., with collection size ≥30 or 50, collecting from the entire natural distribution ranges, and mixing collections from different sources) that can increase genetic representativeness, but they have not yet been widely adopted.…”

Section: Discussionmentioning

confidence: 99%

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Meta‐analysis of genetic representativeness of plant populations under ex situ conservation in contrast to wild source populations

Wei

Jiang

2020

Conservation Biology

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Ex situ conservation is widely used to protect wild plant species from extinction. However, it remains unclear how genetic variation of ex situ plant collections reflects diversity of wild source populations. We conducted a global meta‐analysis of the genetic representativeness of ex situ populations by comparing genetic diversity (i.e., AR, allelic richness; He, expected heterozygosity; PPB, percent polymorphic bands; and SWI, Shannon–Winner index), inbreeding coefficient (FIS), and genetic differentiation between ex situ plant collections and their wild source populations. Genetic diversity (i.e., He, PPB, and SWI) was significantly lower in ex situ populations than their wild source populations, whereas genetic differentiation between ex situ and wild populations (ex‐situ‐wild FST), but not that among ex situ populations, was significantly higher than among wild populations. Outcrossing species, but not those with mixed mating system, had significantly lower genetic diversity in ex situ populations and significantly higher ex‐situ‐wild FST. When the collection size for ex situ conservation was ≥30 or 50, PPB, He, and ex‐situ‐wild FST were not significantly different between ex situ and wild populations, indicating a relatively high genetic representativeness. Collecting from the entire natural distribution range and mixing collections from different sources could significantly increase the genetic representativeness of ex situ populations. Type of ex situ conservation (i.e., planting or seed bank) had no effect on genetic representativeness. The effect size of He decreased and the effect size of ex‐situ‐wild FST increased as the duration of ex situ conservation increased. Our results suggest that current ex situ plant collections do not effectively capture the genetic variation of wild populations. Low genetic representativeness of ex situ populations was caused by both initial incomplete sampling from wild populations and genetic erosion during ex situ conservation. We emphasize that it is necessary to employ more thorough sampling strategies in future collecting efforts and to add new individuals where needed.

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Section: Discussionmentioning

confidence: 99%

“…2011) or even higher (LaBonte et al. 2017) levels of genetic diversity in ex situ populations. Inbreeding coefficient also exhibits mixed results among ex situ conservation genetic studies (Aavik et al.…”

Section: Introductionmentioning

confidence: 99%

Meta‐analysis of genetic representativeness of plant populations under ex situ conservation in contrast to wild source populations

Wei

Jiang

2020

Conservation Biology

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“…Many forest areas in eastern North America are affected negatively by human disturbances (Foster, Motzkin, & Slater, 1998; LaBonte, Tonos, Hartel, & Woeste, 2017), insect and pathogen infestations (Orwig & Foster, 1998; Ramsfield, Bentz, Faccoli, Jactel, & Brockerhoff, 2016; Trumbore, Brando, & Hartmann, 2015), drought (Allen, Breshears, & McDowell, 2015; Klos, Wang, Bauerle, & Rieck, 2009; Millar & Stephenson, 2015), wildfire (Mutch et al, 1993), and global climate change (Trumbore et al, 2015). Human disturbances in forest ecosystems include land conversion for agriculture and settlements (Foster et al, 1998; Weir & Ott, 1997), logging (Hayes, Moody, White, & Costanza, 2007; Pyle, 1984), and fragmentation by building infrastructure (Kwak et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Cours.) Rudd (Yellowwood, F ST = 0.11–0.23), showed strong genetic differentiation, which was likely related to their patchy distributions and population structure (Bednorz & Kosiński, 2006; LaBonte et al, 2017). Unlike S. torminalis and C. kentukea , C. canadensis is widely distributed across the United States and found in a wide range of ecological habitats.…”

Section: Discussionmentioning

confidence: 99%

Habitat fragmentation influences genetic diversity and differentiation: Fine‐scale population structure ofCercis canadensis(eastern redbud)

Ony

Nowicki

Boggess

et al. 2020

Ecology and Evolution

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Forest fragmentation may negatively affect plants through reduced genetic diversity and increased population structure due to habitat isolation, decreased population size, and disturbance of pollen-seed dispersal mechanisms. However, in the case of tree species, effective pollen-seed dispersal, mating system, and ecological dynamics may help the species overcome the negative effect of forest fragmentation. A fine-scale population genetics study can shed light on the postfragmentation genetic diversity and structure of a species. Here, we present the genetic diversity and population structure of Cercis canadensis L. (eastern redbud) wild populations on a fine scale within fragmented areas centered around the borders of Georgia-Tennessee, USA. We hypothesized high genetic diversity among the collections of C. canadensis distributed across smaller geographical ranges. Fifteen microsatellite loci were used to genotype 172 individuals from 18 unmanaged and naturally occurring collection sites. Our results indicated presence of population structure, overall high genetic diversity (H E = 0.63, H O = 0.34), and moderate genetic differentiation (F ST = 0.14)among the collection sites. Two major genetic clusters within the smaller geographical distribution were revealed by STRUCTURE. Our data suggest that native C. canadensis populations in the fragmented area around the Georgia-Tennessee border were able to maintain high levels of genetic diversity, despite the presence of considerable spatial genetic structure. As habitat isolation may negatively affect gene flow of outcrossing species across time, consequences of habitat fragmentation should be regularly monitored for this and other forest species. This study also has important implications for habitat management efforts and future breeding programs. K E Y W O R D S Cercis canadensis, fine-scale population structure, genetic diversity, habitat fragmentation, redbud S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Ony MA, Nowicki M, Boggess SL, et al. Habitat fragmentation influences genetic diversity and differentiation: Fine-scale population structure of Cercis canadensis (eastern redbud).

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“…The low levels of tree genetic diversity reported in some cities of temperate regions was explained by their reliance on poorly diversified planting material (selected and clonal material) from commercial nurseries [52]. However, there are cases in which urban trees commercially grown in nurseries come from a mixture of different wild provenances, and thus show a higher genetic diversity than the wild populations [53]. The genetic diversity observed in Yaoundé could thus be rooted in the informal seed exchange system, where seeds are loosely selected and planted by urban dwellers.…”

Section: Discussionmentioning

confidence: 99%

Trees and their seed networks: the social dynamics of urban fruit trees and implications for genetic diversity

Rimlinger¹,

Avana

Awono³

et al. 2020

Preprint

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Trees are a traditional component of urban spaces where they provide ecosystem services critical to urban wellbeing. In the Tropics, urban trees’ seed origins have rarely been characterized. Yet, understanding the social dynamics linked to tree planting is critical given their influence on the distribution of associated genetic diversity. This study examines elements of these dynamics (seed exchange networks) in an emblematic indigenous fruit tree species from Central Africa, the African plum tree (Dacryodes edulis, Burseraceae), within the urban context of Yaoundé. We further evaluate the consequences of these social dynamics on the distribution of the genetic diversity of the species in the city. Urban trees were planted predominantly using seeds sourced from outside the city, resulting in a level of genetic diversity as high in Yaoundé as in a whole region of production of the species. Debating the different drivers that foster the genetic diversity in planted urban trees, the study argued that cities and urban dwellers can unconsciously act as effective guardians of indigenous tree genetic diversity.

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Genetic diversity and differentiation of yellowwood [Cladrastis kentukea (Dum.Cours.) Rudd] growing in the wild and in planted populations outside the natural range

Cited by 8 publications

References 29 publications

Meta‐analysis of genetic representativeness of plant populations under ex situ conservation in contrast to wild source populations

Meta‐analysis of genetic representativeness of plant populations under ex situ conservation in contrast to wild source populations

Habitat fragmentation influences genetic diversity and differentiation: Fine‐scale population structure ofCercis canadensis(eastern redbud)

Trees and their seed networks: the social dynamics of urban fruit trees and implications for genetic diversity

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