Phylogeographic analyses and genetic structure illustrate the complex evolutionary history of <i>Phragmites australis</i> in Mexico

Colín, Ricardo Pacheco; Eguiarte, Luis E.

doi:10.3732/ajb.1500399

Cited by 27 publications

(17 citation statements)

References 86 publications

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“…Introduced European genotypes have long been considered invasive with widespread detrimental impacts (Marks et al 1994), while populations of native genotypes are lost (Saltonstall 2002) and are considered of conservation concern in some eastern states. The status of the Gulf Coast lineage as native or introduced remains unresolved (Lambertini et al 2012;Colin and Eguiarte 2016). Recently the existence of hybrids between European and North American lineages, long suspected due to common garden evidence (Meyerson et al 2008), has been confirmed in wetlands in New York and Nevada (Saltonstall et al 2014.…”

Section: Study Speciesmentioning

confidence: 99%

“…Present day populations of P. australis in North America consist of three different lineages: (1) introduced genotypes overwhelmingly of European origin introduced in the 1800s at Atlantic Coast seaports (Saltonstall 2002) that are now widespread throughout North America from southern Canada to the Gulf Coast and southern California (Saltonstall and Meyerson 2016), but absent from Mexico (Colin and Eguiarte 2016); (2) a genetically diverse native and endemic subspecies P. australis americanus that is widespread in North America except in the southeastern US but now confirmed in northern Mexico (Colin and Eguiarte 2016;Saltonstall and Meyerson 2016); and (3) a Gulf Coast lineage P. australis berlandieri that occurs throughout the southern US, throughout Mexico, and into South America (Colin and Eguiarte 2016;Saltonstall and Meyerson 2016). Introduced European genotypes have long been considered invasive with widespread detrimental impacts (Marks et al 1994), while populations of native genotypes are lost (Saltonstall 2002) and are considered of conservation concern in some eastern states.…”

Section: Study Speciesmentioning

confidence: 99%

See 1 more Smart Citation

Management of invasive Phragmites australis in the Adirondacks: a cautionary tale about prospects of eradication

et al. 2017

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Invasive plant management (largely mechanical and chemical) consumes an ever-increasing portion of budgets for land management organizations, but metrics of success, other than extent of areas treated or resources expended is rarely available. Here we assess success of managing 346 populations of invasive Phragmites australis (range 0.36-4134 m 2 ; cover 37-75%) in the Adirondack Park in upstate New York, USA. We began by treating 18 patches in 2010 using herbicide; gradually adding patches treated annually or intermittently for a total of 334 by the end of the project period. We monitored each population annually and if P. australis was present mapped its spatial extent and estimated cover. We considered P. australis eradicated when live stems were absent from a site for at least three consecutive years. Our treatments reduced size and cover of P. australis populations and eradication was achieved at 104 of 294 sites. However, probability of eradicating P. australis over a 7-year project timeframe was 0.83 for the smallest patches (0.36 m 2 ), whereas at medium (45 m 2 ) and large patches ([3000 m 2 ) probability of eradication decreased to 0.26 and 0.02, respectively. Our results question efficacy of managing large P. australis populations with the goal of eradication. We urge conservation organizations to clearly articulate management objectives beyond short-term suppression of target plants and to promote accountability by providing quantitative measurements of outcomes.

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Section: Study Speciesmentioning

confidence: 99%

Section: Study Speciesmentioning

confidence: 99%

Management of invasive Phragmites australis in the Adirondacks: a cautionary tale about prospects of eradication

et al. 2017

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“…A closely related lineage known as Delta, originating from the Mediterranean (Lambertini et al, 2012), has been reported only from the Mississippi River Delta in Louisiana (Hauber, Saltonstall, White, & Hood, 2011; Knight et al, 2018). A fourth lineage, known as Gulf, is widely distributed along the Gulf of Mexico and west to California (Lambertini et al, 2012; Meyerson et al, 2012), is likely to be a recent arrival from Mexico or Central America (Colin & Eguiarte, 2016) and is spreading (Bhattarai & Cronin, 2014).…”

Section: Methodsmentioning

confidence: 99%

Intraspecific and biogeographical variation in foliar fungal communities and pathogen damage of native and invasivePhragmites australis

Allen

DeVries

Bologna

et al. 2020

Global Ecol Biogeogr

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Aim:Recent research has highlighted that the relationship between species interactions and latitude can differ between native and invasive plant taxa, generating biogeographical heterogeneity in community resistance to plant invasions. In the first study with foliar pathogens, we tested whether co-occurring native and invasive lineages of common reed (Phragmites australis) exhibit non-parallel latitudinal gradients in foliar fungal communities, pathogen susceptibility and damage, and whether these biogeographical patterns can influence the success of invasion.Location: North America. Time period: 2015-2017.Major taxa studied: Perennial grass P. australis. Methods:We surveyed 35 P. australis field populations, spanning 17° latitude and comprising four phylogeographical lineages, including one endemic to North America and one invasive from Europe. For each population, we quantified the percentage of leaf pathogen damage and cultured fungi from diseased leaves, which we identified using molecular tools. To assess whether latitudinal gradients in pathogen damage had a genetic basis, we inoculated plants from 73 populations with four putative pathogens in a complementary common garden experiment and measured P. australis susceptibility (i.e., diseased leaf area). Results:We isolated 84 foliar fungal taxa. Phragmites australis lineage influenced fungal community composition but not diversity. Despite the invasive European P. australis lineage being the least susceptible to three of the four pathogens tested in the common garden experiment, pathogen damage in the field was similar between native and invasive lineages, providing no evidence that release from foliar pathogens contributes to the success of invasion. Genetically based latitudinal gradients in pathogen susceptibility observed in the common garden were isolate specific and obscured by local environmental conditions in the field, where pathogen damage was threefold higher for northern compared with southern populations, regardless of lineage.

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“…This invasive European lineage is mostly composed of a single haplotype (M) and forms large, dense, monospecific populations that negatively impact hydrology, native plant diversity, habitat quality for fauna, and ecosystem function (reviewed by Meyerson et al 2009). An additional lineage (known as Gulf) is widely distributed along the Gulf of Mexico and west to California , Meyerson et al 2012) and is likely a recent arrival from Mexico or Central America (Colin and Eguiarte 2016). Although its mode of introduction to North America remains unknown, we classify it as invasive (following Richardson et al 2000) due to its fast-growing populations (Bhattarai and Cronin 2014) and rapid spread (Meyerson et al 2012).…”

Section: Study Organismsmentioning

confidence: 99%

Intraspecific variation in indirect plant–soil feedbacks influences a wetland plant invasion

Allen

Meyerson

Flick

et al. 2018

Ecology

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Plant-soil feedbacks (PSFs) influence plant competition via direct interactions with pathogens and mutualists or indirectly via apparent competition/mutualisms (i.e., spillover to co-occurring plants) and soil legacy effects. It is currently unknown how intraspecific variation in PSFs interacts with the environment (e.g., nutrient availability) to influence competition between native and invasive plants. We conducted a fully crossed multi-factor greenhouse experiment to determine the effects of Phragmites australis rhizosphere soil biota, interspecific competition, and nutrient availability on biomass of replicate populations from one native and two invasive lineages of common reed (P. australis) and a single lineage of native smooth cordgrass (Spartina alterniflora). Harmful soil biota consistently dominated PSFs involving all three P. australis lineages, reducing biomass by 10%. Indirect PSFs (i.e., soil biota spillover) from the two invasive P. australis lineages reduced S. alterniflora biomass by 7%, whereas PSFs from the native P. australis lineage increased S. alterniflora biomass by 6%. Interestingly, interspecific competition and PSFs interacted to weaken their respective impacts on S. alterniflora, whereas they exerted synergistic negative effects on P. australis. Phragmites australis soil biota decreased S. alterniflora biomass when grown alone (i.e., a soil legacy), but increased S. alterniflora biomass when grown with P. australis, suggesting that P. australis recruits harmful generalist soil biota or facilitates S. alterniflora via spillover (i.e., apparent mutualism). Soil biota also reduced interspecific competition impacts on S. alterniflora, although it remained competitively inferior to P. australis across all treatments. Competitive interactions and responses to nutrients did not differ among P. australis lineages, indicating that interspecific competition and nutrient deposition may not be key drivers of P. australis invasion in North America. Although soil biota, interspecific competition, and nutrient availability appear to have no direct impact on the success of invasive P. australis lineages in North America, intraspecific lineage variation in indirect spillover and soil legacies from P. australis occur and may have important implications for co-occurring native species and restoration of invaded habitats. Our study integrates multiple factors linked to plant invasions, highlighting that indirect interactions are likely commonplace in influencing plant community dynamics and invasion success and impacts.

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Phylogeographic analyses and genetic structure illustrate the complex evolutionary history of Phragmites australis in Mexico

Cited by 27 publications

References 86 publications

Management of invasive Phragmites australis in the Adirondacks: a cautionary tale about prospects of eradication

Management of invasive Phragmites australis in the Adirondacks: a cautionary tale about prospects of eradication

Intraspecific and biogeographical variation in foliar fungal communities and pathogen damage of native and invasivePhragmites australis

Intraspecific variation in indirect plant–soil feedbacks influences a wetland plant invasion

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