{"title":"Population structure of three invasive congeneric teasel (Dipsacus) species","authors":"John F. Gaskin, Natalie West, Brian G. Rector","doi":"10.1017/inp.2024.5","DOIUrl":"https://doi.org/10.1017/inp.2024.5","url":null,"abstract":"Three species of the Old World genus <jats:italic>Dipsacus</jats:italic> L. are considered invasive in the Americas, yet they may differ in how they spread, reproduce, and in genetic diversity. Differences in invasion method may suggest that different management techniques are needed for each species. We performed genetic analyses on 572 plants in 69 populations from the USA, Argentina, and Eurasia with the goals of analyzing taxonomy, diversity, mode of reproduction, population structure and founder effect of each of these species’ invasions, as well as looking for evidence of recent or ongoing hybridization. We found <jats:italic>D. sativus</jats:italic> to be lowest in diversity and possibly relying on self-pollination more than the other species, <jats:italic>D. fullonum</jats:italic> and <jats:italic>D. laciniatus</jats:italic>. We found no evidence of hybridization within the invasions and no support for <jats:italic>D. sativus</jats:italic> as a subspecies of <jats:italic>D. fullonum</jats:italic>. The closest genetic matches of <jats:italic>D. fullonum</jats:italic> from USA to the native range were with Hungary and Spain, while the closest match for <jats:italic>D. fullonum</jats:italic> between Argentina and the native range was with Spain. <jats:italic>Dipsacus laciniatus</jats:italic> from the USA most closely matched with samples from Russia. Population structure information regarding these three weedy <jats:italic>Dipsacus</jats:italic> species can help us understand their invasive processes as well as give insight into their management and the development of a biological control program.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140005935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeremiah R. Foley, Summer E. Stebbins, Riley Doherty, Nicholas P. Tippery, Gregory J. Bugbee
{"title":"Hydrilla verticillata subsp. lithuanica: discovery and establishment outside of the Connecticut River","authors":"Jeremiah R. Foley, Summer E. Stebbins, Riley Doherty, Nicholas P. Tippery, Gregory J. Bugbee","doi":"10.1017/inp.2024.4","DOIUrl":"https://doi.org/10.1017/inp.2024.4","url":null,"abstract":"Hydrilla [<jats:italic>Hydrilla verticillata</jats:italic> (L.f.) Royle], an invasive aquatic weed, has had a rich introduction history into the United States with multiple subspecies being introduced since the 1960’s. The most recent occurred prior to 2016, when northern hydrilla (<jats:italic>Hydrilla verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic>) was discovered in the Connecticut River. By 2021, following a three-year survey from Agawam, MA to the Long Island Sound by the Connecticut Agricultural Experiment Station Office of Aquatic Invasive Species, <jats:italic>H. verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic> was found in over 113 km of the river, occupying 344 hectares. Since this survey, there has been concern that <jats:italic>H. verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic> would spread to nearby waterbodies and have a significant negative impact. Here we report the first documented spread and establishment of <jats:italic>H. verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic> from the Connecticut River to five waterbodies in Connecticut and one in Massachusetts. Of the total eight sites where <jats:italic>H. verticillata</jats:italic> observations were made, 75% (n=6) were confirmed to be <jats:italic>H. verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic> and 25% (n=2) to be wandering hydrilla (<jats:italic>Hydrilla. verticillata</jats:italic> subsp. <jats:italic>peregrina</jats:italic>). Except for one site, all six locations infested with <jats:italic>H. verticillata</jats:italic> subsp. <jats:italic>lithuanica</jats:italic> provide watercraft access through public or private boat ramps. The authors also postulate on the mechanisms facilitating the spread and establishment of this subspecies.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139771519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Long-term interactive impacts of the invasive shrub, Lonicera maackii, and white-tailed deer, Odocoileus virginianus, on a deciduous forest understory","authors":"Marco U. Donoso, Hanna Leonard, David L. Gorchov","doi":"10.1017/inp.2024.2","DOIUrl":"https://doi.org/10.1017/inp.2024.2","url":null,"abstract":"White-tailed deer and invasive plants affect forest understories, but few studies have investigated their interaction. We investigated long-term (11-year) effects of excluding deer and removing the invasive shrub, <jats:italic>Lonicera maackii</jats:italic>, on plants in southwest Ohio. Deer exclusion enhanced tree seedling richness and density, but reduced annual and bare ground cover. Vine density was reduced by <jats:italic>Lonicera</jats:italic>, especially where deer were excluded. Seedlings of several tree species, the invasive shrub <jats:italic>Euonymous alatus</jats:italic>, and the invasive vine <jats:italic>E. fortunei</jats:italic>, were indicator species of the deer exclosure x <jats:italic>Lonicera</jats:italic> removal treatment combination. The effect of deer on cover of native species depended on <jats:italic>Lonicera</jats:italic> treatment: where shrubs were removed, cover was higher where deer were excluded, but where shrubs were present, cover was higher where deer had access. We attribute these interactions to the reduced growth of, and shading by, <jats:italic>Lonicera</jats:italic> where deer had access and browsed this invasive shrub. Some of these effects were evident in the first 6 years, but are now larger. Other effects were not evident in the earlier evaluation. These findings inform management of areas with high densities of deer and invasive shrubs palatable to deer. Control only of invasive shrubs will reduce native cover and not improve tree regeneration. Managing only deer will increase woody plants but reduce native cover. Management of both stressors is needed to promote tree regeneration and restoration of plant communities.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139586788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Competition reduces structural defense in an invasive thistle in the field","authors":"Rachel Lamb, Joseph Keller, Katriona Shea","doi":"10.1017/inp.2023.33","DOIUrl":"https://doi.org/10.1017/inp.2023.33","url":null,"abstract":"Invasive thistles reduce the productivity of pastures and rangelands because their structural defenses make them unpalatable to grazing livestock. However, plants potentially alter their growth patterns, including their allocation of resources to defense, in response to the presence of competing vegetation. Understanding the effects of competition on the structural defense of problematic pasture weeds can inform management plans that reduce the economic harm caused by these pests. We grew <jats:italic>Carduus nutans</jats:italic> L. in a fully crossed factorial field experiment in a single abandoned pasture in 2017 with two experimental factors: the level of thistle infestation (1 thistle or 5, resulting in densities of 4 or 20 plants m<jats:sup>-2</jats:sup>) and the presence or absence of grazing (simulated by weekly trimming of competing vegetation). We assessed the effects of treatments on defense by counting prickles >3 mm long on leaves. Our analysis included leaf age and leaf size as covariates. Competition reduced the number of prickles present on leaves. Regression analysis showed that an increase from, for example, 50 g to 200 g of competing vegetation within 50 x 50 cm study plots reduced the expected average number of prickles on intermediate-aged leaves with average length 25.5 cm by 76.9 prickles/leaf, or 41%. This pattern was similar for leaves of all ages, though the oldest leaves generally had fewer prickles than younger leaves. We did not observe differences in defense structures between plants neighbored by conspecifics and those neighbored by other competitors. <jats:italic>Carduus nutans</jats:italic> has been previously managed using high densities of grazers, and this practice may be more likely to damage less-defended individuals such as those we observed in our treatments with competition. This finding suggests that maintaining competition in pastures may increase <jats:italic>C. nutans</jats:italic>’ vulnerability to grazing.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139421763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Early detection of Youngia japonica (L.) DC. (Asteraceae) in São Miguel island, Azores","authors":"Guilherme Roxo, Luís Silva, Lurdes Borges Silva, Rúben Rego, Roberto Resendes, Mónica Moura","doi":"10.1017/inp.2023.32","DOIUrl":"https://doi.org/10.1017/inp.2023.32","url":null,"abstract":"<jats:italic>Youngia japonica</jats:italic> (L.) DC. was recently discovered on the Azorean island of São Miguel. This species is a cosmopolitan herb that has been reported to be invasive in several regions of the world. It is unclear when and how this plant arrived in São Miguel, Azores. Nevertheless, we hypothesize that this is an unintentional and recent introduction. The populations are expanding in São Miguel, and action is needed to mitigate potential damage to native ecosystems.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139411017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Brent Lovelock, Yun Ji, Anna Carr, Clara-Jane Blye
{"title":"Tourists’ (mis)understandings of nature: International and domestic visitors’ perceptions of invasive alien plants in New Zealand","authors":"Brent Lovelock, Yun Ji, Anna Carr, Clara-Jane Blye","doi":"10.1017/inp.2023.30","DOIUrl":"https://doi.org/10.1017/inp.2023.30","url":null,"abstract":"Tourism, as one of the world largest economic sectors, moving a substantial body of individuals and materials about the world, is implicated in the spread of invasive plants and is itself impacted by biological invasions which can degrade touristic landscapes and affect destination communities. Tourists constitute not only an immediate biological threat, but through their landscape and biota preferences also constitute a substantial economic and ecological force that has implications for invasive plant management in destinations. Tourists and the tourism industry are therefore significant stakeholders in invasive plant introduction, spread and management. This paper discusses an onsite survey (n=231) of domestic and international visitors in New Zealand, a destination where invasive species are an important ecological and economic issue. Findings show that visitors have a low understanding of the presence and level of threat of invasive plants, and express preferences for some plants that are highly invasive. However, there were substantial variations across the international sample, with visitors from Asian and European ethnicities expressing significantly different attitudes towards a range of invasive plants. Asian visitors were more likely to show preferences for some plants that were seriously invasive, and to be more accepting in general of invasive plants within landscapes, and less supportive of invasive species eradication. These findings suggest that attitudes towards invasive plants and their management may be culturally determined, which poses challenges for managers aiming to generate awareness and support from across diverse tourist cohorts for invasive species control. There are also challenges for gaining support from the tourism industry for invasive plant control programmes where particular ‘charismatic’ or attractive invasive plants may contribute to touristic landscapes and visitor itineraries.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138506793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mackenzie E. Bell, Stephen F. Enloe, James K. Leary, Dwight K. Lauer
{"title":"Novel basal bark and cut stump herbicide treatments for Brazilian peppertree (<i>Schinus terebinthifolia</i>) management","authors":"Mackenzie E. Bell, Stephen F. Enloe, James K. Leary, Dwight K. Lauer","doi":"10.1017/inp.2023.29","DOIUrl":"https://doi.org/10.1017/inp.2023.29","url":null,"abstract":"Abstract Brazilian peppertree ( Schinus terebinthifolia ) is an aggressive shrub that infests over 280,000 ha in Florida. Individual plant treatments (IPT) including basal bark and cut stump application with triclopyr butoxyethylester and triethylamine formulations, respectively, have been used for decades. While they are both effective, resprouting can occur, which requires retreatment for control. Recent research on other woody invasive plants has indicated additional non-crop herbicides used in natural areas can be effective with these IPT techniques and therefore, warrant testing on Brazilian peppertree. In 2018 and 2019, basal bark and cut stump studies were conducted at Cape Canaveral Air Force Station in natural areas infested with Brazilian peppertree. In the basal bark application studies, we found aminocyclopyrachlor applied at 12 and 24 g L -1 and triclopyr acid applied at 34 and 69 g L -1 each provided 100% defoliation of multi-stemmed Brazilian peppertree individuals with a mean root collar diameter up to 20.2 cm at 360 days after treatment. These were not different from triclopyr ester applied at 96 g L -1 . Imazamox applied at 30 g L -1 resulted in 86% defoliation 360 DAT. However, we observed formulation incompatibility when it was mixed with basal bark oil, which may limit its utility. In cut stump studies, we found aminocyclopyrachlor and aminopyralid each individually applied at 6, 12, and 24 g L -1 , resulted in stump mortality that was not different from the commercial standard triclopyr amine applied at 180 g L -1 . Similar results were found for a triclopyr acid formulation applied at 86 and 172 g L -1 and imazamox applied at 60 g L -1 . For both treatment techniques, we found that alternative treatments provided control at lower herbicide concentrations than triclopyr ester and amine commercial standards. These results advance our understanding of IPT and expand access to additional effective herbicide options for Brazilian peppertree management.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Seed longevity and germination of the emerging invasive species wavyleaf basketgrass (<i>Oplismenus undulatifolius</i>) under varied light regimes","authors":"Dominique H. Pham, Carrie A. Wu","doi":"10.1017/inp.2023.27","DOIUrl":"https://doi.org/10.1017/inp.2023.27","url":null,"abstract":"Abstract Invasive non-indigenous species pose a serious threat to native biodiversity and ecosystem functioning. Understanding how species performance varies under conditions in the current and invaded range can help to predict dynamics of the invading species in its new environment. Plants with the ability to alter growth in response to variation in light conditions may be favored in landscapes that experience frequent disturbance, as these species may be able to exploit a wide range of niches. Seed bank persistence may also play a critical role in successful plant invasion, as extended seed viability may increase the chance of outlasting unfavorable conditions, maintain population genetic diversity, and allow re-invasions. This study investigated seed longevity and the effect of light intensity on germination of wavyleaf basketgrass [ Oplismenus undulatifolius (Ard.) P. Beauv], a newly established invasive species in US mid-Atlantic forest understories. Oplismenus undulatifolius seeds were collected across five years from the original site of introduction in Maryland USA and stored in standard lab conditions, then subjected to germination trials under four light conditions in a controlled growth chamber. Seeds remained viable for at least nine years, and light intensity did not significantly impact seed germination. Our study demonstrates the importance of evaluating environmental and temporal effects on germination traits, since the scope of surveillance in the field may need to be expanded based on new information about environmental tolerance. Long-term monitoring may also be necessary to effectively control invasive plant populations capable of forming a persistent seed bank.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135635968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Genetic Analysis of Invasive Spread of <i>Euonymus fortunei</i> (Wintercreeper), a Popular Ornamental Groundcover","authors":"Robert J. Elam, Theresa M. Culley","doi":"10.1017/inp.2023.31","DOIUrl":"https://doi.org/10.1017/inp.2023.31","url":null,"abstract":"ABSTRACT An important route of introduction of some non-native species that subsequently become invasive in the United States is through horticulture. One such plant is Euonymus fortunei (Turcz.) Hand.-Maz., commonly known as wintercreeper, an evergreen groundcover with over 52 different horticultural varieties and which is still sold at many plant nurseries and garden centers in the Midwestern United States. Although several states have recognized E. fortunei as an invasive species, it is unknown how its escape from cultivation has occurred and even the identity of spreading populations, including whether hybrids or cultivars are involved. Using codominant microsatellite markers, we sampled multiple invasive populations in Ohio, Kentucky, Kansas, and Minnesota, and compared their genotypes with commercially available cultivars to determine how spread has occurred. All samples collected from invasive populations were genetically identical to one another and matched perfectly with the ‘Coloratus’ cultivar, the only cultivar to exhibit polyploidy. The data also suggests that E. fortunei may potentially reproduce via apomixis and/or clonally through propagule fragments, which can quickly fix favorable genotypes within a population. To curb continued invasive spread, we suggest that ‘Coloratus’ be removed from commercial sale and distribution. We also propose that land managers, horticultural and landscaping businesses, and governmental agencies carefully monitor other Euonymus cultivars for invasive potential and spread.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Invasion by <i>Pyrus calleryana</i> does not affect understory abundance or diversity in early-successional meadows","authors":"Andrea N. Nebhut, Jeffrey S. Dukes","doi":"10.1017/inp.2023.28","DOIUrl":"https://doi.org/10.1017/inp.2023.28","url":null,"abstract":"Abstract Trait differences between invasive plants and the plants in their recipient communities moderate the impact of invaders on community composition. Callery pear ( Pyrus calleryana Decne.) is a fast-growing, stress-tolerant tree native to China that has been widely planted for its ornamental value. In recent decades, P. calleryana has naturalized throughout the eastern United States, where it spreads rapidly and achieves high abundance in early-successional environments. Here we compare the impacts of low-density, establishment-phase P. calleryana to those of functionally similar native trees on the understory community diversity and total cover of three early-successional meadows in Indiana’s eastern corn belt plains. In contrast to our prediction that P. calleryana would have greater negative effects on the total abundance and diversity of the understory plant community compared to native Liriodendron tulipifera L., Platanus occidentalis L., or non-tree control plots, we found that these low-density populations of P. calleryana had no significant impact on total cover, species richness, or diversity indices for the understory community, compared to the native trees and non-tree control plots. Likewise, the studied populations of P. calleryana had no significant impact on the native, introduced, woody, or native tree subsets of the understory community. These results indicate that in young, low-density populations situated in early-successional meadows, the trait differences between P. calleryana and functionally similar native trees are not of a great enough magnitude to produce changes in community composition. Going forward, complementary research on the impacts of P. calleryana on community composition and ecosystem processes in areas with long-established, dense invasions or invasions in more sensitive ecosystems would allow us to more fully understand how this widespread invader disrupts its host ecosystems.","PeriodicalId":14470,"journal":{"name":"Invasive Plant Science and Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135636234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}