Landscape genetics of the foundational salt marsh plant species black needlerush (Juncus roemerianus Scheele) across the northeastern Gulf of Mexico

Tumas, Hayley R.; Shamblin, Brian M.; Woodrey, Mark S.; Nibbelink, Nathan P.; Chandler, Richard B.; Nairn, Campbell J.

doi:10.1007/s10980-018-0687-z

Cited by 14 publications

(23 citation statements)

References 84 publications

(115 reference statements)

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“…Genetic variation among keystone marsh species has been noted to affect ecosystem properties (Seliskar et al 2002). Zerebecki et al (2017) found that intraspecific variation in the salt marsh foundation species Spartina alterniflora affected plant-plant and plant-herbivore interactions, and Tumas et al (2018) noted the importance of genotypic diversity in preserving the adaptive potential of species following wetland restoration. Additional consequences of high genetic diversity in wetlands include the promotion of species coexistence (Vellend 2006), resiliency to disturbance (Brewer and Bertness 1996;Hughes and Stachowicz 2011), increased productivity and nutrient retention (Zedler 2005;Reynolds et al 2012), increased seed production (Sweetman et al 2013), and altered species interactions (Proffitt et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Plant Community Establishment in a Coastal Marsh Restored Using Sediment Additions

2019

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A goal of wetland restoration is the establishment of resilient plant communities that persist under a variety of environmental conditions. We investigated the role of intraspecific and interspecific variation on plant community establishment in a brackish marsh that had been restored by sediment addition. Plant growth, sediment accretion, and surface elevation change in planted, not-planted, and nearby reference sites (treatments) were compared. Four perennial macrophytes were planted: Bolboschoenus robustus, Distichlis spicata, Phragmites australis, and Schoenoplectus californicus. There was 100% survival of the planted species, and all exhibited rapid vegetative spread. Intraspecific variation in stem height and cover was identified, and interspecific comparisons also indicated differences in species cover. Treatment comparisons revealed that final total cover at not-planted sites was equivalent to that at reference sites, and was highest at planted sites where P. australis became dominant. Species richness was initially highest at the reference sites, but final richness was equivalent among treatments. Soil surface elevation was greater at planted compared to not-planted and reference sites. Because of the rapid cover and increased surface elevation generated by planted species, the resiliency of restored coastal marshes may be enhanced by plantings in areas where natural colonization is slow and subsidence is high.

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Section: Introductionmentioning

confidence: 99%

Plant Community Establishment in a Coastal Marsh Restored Using Sediment Additions

2019

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“…The only genetic study on J. roemerianus to date examined clonal and genetic diversity across ten sites in the northeastern Gulf of Mexico from eastern Mississippi to the western panhandle of Florida (Tumas et al 2018). As reported for other clonal plant species (Ellstrand and Roose 1987;Silvertown 2008;Gabrielsen and Brochmann 1998;Lloyd et al 2011;Pleuss and Stocklin 2004), clonal and genetic diversity were higher than expected based on the existing life history literature with an average genotypic diversity of 0.54 and average observed heterozygosity of 0.58 across the ten sites.…”

Section: Introductionmentioning

confidence: 83%

“…1). Ten sites were sampled in the Gulf of Mexico as part of another study (Tumas et al 2018), two of which (GB and AP) are National Estuarine Research Reserves (NERR). A set of 304 samples was collected from Grand Bay NERR (GB) in January and March 2015, and a set of 32 samples was collected from Apalachicola NERR (AP) in May 2015 and March 2016.…”

Section: Sample Collectionmentioning

confidence: 99%

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Broad-scale patterns of genetic diversity and structure in a foundational salt marsh species black needlerush (Juncus roemerianus)

et al. 2019

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Clonal and genetic diversity in foundational plant species are critical for species resiliency and ecosystem processes, both of which contribute to restoration success; however, genetic data is often lacking for common plant species used in many restoration practices. Only a few plant species dominate salt marshes, ecologically and economically valuable ecosystems targeted for restoration due to global decline. Despite being a foundational species in southeastern United States salt marshes black needlerush (Juncus roemerianus Scheele) is understudied, especially in comparison to the co-occurring smooth cordgrass (Spartina alterniflora Loisel). We used a panel of 18 microsatellite markers on 849 samples of J. roemerianus collected at 17 sites across a majority of the species range from Mississippi to South Carolina to measure clonal and genetic diversity and characterize population structure. Results are consistent with previous genetic studies on J. roemerianus and other clonal plant species in that clonal and genetic diversity were higher than expected based on life history literature, with an average genotypic diversity (G D) of 0.67 and average observed heterozygosity (H O) of 0.56. Differences in diversity between the ecologically and environmentally divergent Gulf (G D = 0.64, H O = 0.52) and Atlantic (G D = 0.80, H O = 0.45) coasts suggest that life history strategy may vary by environment. Hierarchical structure was apparent across the study area, with STRU CTU RE analyses identifying three genetic clusters that further subdivided into five clusters and a broad transition zone. The scale of this genetic differentiation should be considered in sourcing plants for salt marsh restoration efforts.

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“…A well-connected vegetation patch receives more dispersers and also provides more propagules (Taylor et al, 1993). In addition, connectivity allows species moving in the landscape to collect resources, colonize new habitats and help maintain genetic diversity through the dispersion of pollen and seeds (Tumas et al, 2018). These ecological processes can be affected by the lack of connectivity, risking the permanence of plant populations in a landscape (Santos et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Identifying priority connectivity in a tropical forest hotspot severely affected by land use changes

Junior

Heringer

Bueno

et al. 2020

Preprint

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The probability that a propagule reaches a certain location where it can establish and persist is affected by the distance from the source. Fragmented landscapes often promote the isolation of habitats that hinder or impede the movement of species that affect their range distribution, even when environmental conditions are adequate. Studies that assess the connectivity of the landscape are essential to ensure that ecological conservation planning covers all vital processes that occur on a landscape scale. Based on the classification of land cover in the Rio Doce Basin - RDB, we used a habitat / non-habitat approach to assess RDB connectivity for tree species. Based on circuit theory, we built 6 surface models of resistance based on habitat and non-habitat areas. We performed the analysis using the GIS plug-in and Linkage Mapper to generate lest cost path maps. The RDB is very fragmented, but still has functionally connected regions. The west to nothwestern and southeastern portions of the basin are well-connected and demand conservation practices, while the center-north of the basin and the far southwest are regions with greater resistance to connectivity as a result of strong anthropic pressures that reduce forests, requiring intervention through restoration projects avoiding loss due to lack of connectivity. In addition, land reclamation projects in degraded areas must also be organized in the Linhares region, as it is inserted in a region of very high biodiversity with a high level of endemism and a high number of threatened species.

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Landscape genetics of the foundational salt marsh plant species black needlerush (Juncus roemerianus Scheele) across the northeastern Gulf of Mexico

Cited by 14 publications

References 84 publications

Plant Community Establishment in a Coastal Marsh Restored Using Sediment Additions

Plant Community Establishment in a Coastal Marsh Restored Using Sediment Additions

Broad-scale patterns of genetic diversity and structure in a foundational salt marsh species black needlerush (Juncus roemerianus)

Identifying priority connectivity in a tropical forest hotspot severely affected by land use changes

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