New Approaches for Volunteer Data Collection and Analysis − The Invasive Plant Atlas of New England

Mehrhoff, L. J.

doi:10.1021/bk-2011-1073.ch014

Cited by 3 publications

(6 citation statements)

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“…7). Alternatively, as early reports of introduced C. caroliniana date back to over 70 years ago, there could have been a different commercial source at that time (Les and Mehrhoff 1999;Mehrhoff et al 2003). There is a slight chance that a pathway exists from IN to the other northeastern populations (based on sharing Cab12) but this scenario seems unlikely given the differences in DNA content and the absence of the other rare haplotype.…”

Section: Discussionmentioning

confidence: 99%

Pathways of introduction of the invasive aquatic plant Cabomba caroliniana

McCracken

Bainard

Miller

et al. 2013

Ecology and Evolution

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The pathway and frequency of species' introductions can affect the extent, impact, and management of biological invasions. Here, we examine the pathway of introduction of the aquatic plant Cabomba caroliniana (fanwort) into Canada and the northern United States using plastid DNA sequence (intergenic spacers atpF-atpH, trnH-psbA, and trnL-trnF) and DNA content analyses. We test the hypothesis that the spread of fanwort is a result of commercial trade by comparing a Canadian population (Kasshabog Lake, ON) to native populations from southern U.S., introduced populations in northern U.S., and plants from commercial retailers. Thirteen plastid haplotypes were identified throughout North America, including one dominant haplotype, which was present in all C. caroliniana populations. Several rare haplotypes were used to infer shared colonization history. In particular, the Canadian population shared two rare alleles with a population from Massachusetts, suggesting range expansion of C. caroliniana from the northern U.S. However, the possibility of a commercial introduction cannot be excluded, as common alleles were shared between the Canadian population and both commercial and southern U.S. sources. Variation in C. caroliniana genome size was bimodal and populations were classified into “high” and “low” categories. The Canadian population had DNA contents similar to several northern U.S. populations (low DNA content). This may provide additional support for range expansion from these introduced populations rather than from commercial sources or populations in the southern U.S., which had high DNA content.

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Section: Discussionmentioning

confidence: 99%

Pathways of introduction of the invasive aquatic plant Cabomba caroliniana

McCracken

Bainard

Miller

et al. 2013

Ecology and Evolution

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“…Plot-based surveys on the presence ⁄ absence and abundance of invasive species have been gathered by a group of volunteers across New England as part of the IPANE project since 2001 (Mehrhoff et al 2003). Volunteers are initially trained by IPANE staff on plant identification and field data collection methods, and there is periodic follow-up training.…”

Section: S P E C I E S D a T Amentioning

confidence: 99%

“…Inclusion of site variables allowed us to differentiate the effects of climate and LULC from those due to local characteristics such as habitat type and light availability. As part of the Hot spots for plant invasions 1221 IPANE sampling protocol, volunteers gathered data on habitat and per cent canopy closure at each sampled location (Mehrhoff et al 2003). Habitat types were originally classified into 31 categories, but to simplify the analysis we grouped them into eight general types: edge, deciduous and mixed forests, evergreen forests, open wetlands, closed canopy wetlands, marine influence, open ⁄ abandoned and other (this would include sites that were not defined by any of the original types) (Table S1).…”

Section: S I T E D a T A ( H A B I T A T T Y P E A N D C A N O P Y C mentioning

confidence: 99%

“…Such disturbances, together with the introduction of alien species since the 17th century, have promoted the establishment of many plant species. In recent years there has been a major effort to collect data on the extent of plant invasions across the region (Mehrhoff et al 2003). The Invasive Plant Atlas of New England project (IPANE: http://www.IPANE.org) was initiated in 2001 to evaluate the status of invasive species.…”

Section: Introductionmentioning

confidence: 99%

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Identifying hotspots for plant invasions and forecasting focal points of further spread

Ibáñez

Silander

Allen

et al. 2009

Journal of Applied Ecology

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Summary 1.To ensure the successful detection, control and eradication of invasive plant species, we need information that can identify areas prone to invasions and criteria that can point out which particular populations may become foci of further spread. Specifically, our work aimed to develop statistical models that identify hotspots of invasive plant species and evaluate the conditions that give rise to successful populations of invasive species. 2. We combined extensive data sets on invasive species richness and on species per cent ground cover, together with climate, local habitat and land cover data. We then estimated invasive species richness as a function of those environmental variables by developing a spatially explicit generalized linear model within a hierarchical Bayesian framework. In a second analysis, we used an ordinal logistic regression model to quantify invasive species abundance as a function of the same set of predictor variables. 3. Our results show which locations in the studied region, north-eastern USA, are prone to plant species invasions given the combination of climatic and land cover conditions particular to the sites. Predictions were also generated under a range of climate scenarios forecasted for the region, which pointed out at an increase in invasive species incidence under the most moderate forecast. Predicted abundance for some of the most common invasive plant species, Berberis thumbergii, Celastrus orbiculatus, Euonymus alata, Elaeagnus umbellata and Rosa multiflora, allowed us to identify the specific conditions that promote successful population growth of these species, populations that could become foci of further spread. 4. Synthesis and applications. Reliable predictions of plants' invasive potential are crucial for the successful implementation of control and eradication management plans. By following a multivariate approach the parameters estimated in this study can now be used on targeted locations to evaluate the risk of invasions given the local climate and landscape structure; they can also be applied under different climate scenarios and changing landscapes providing an array of possible outcomes. In addition, this modelling approach can be easily used in other regions and for other species.

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“…Similarly, only c. 1% of samples were obtained at elevations >1500 m, which may have been inadequate for identifying declining occurrence in the other models. On the other hand, movement up to higher elevations, which tend to be heavily forested and remote, may be underway, given the known occurrence of C. orbiculatus in relatively cold portions of New England (Mehrhoff et al 2003). The position9 variable was positively related to occurrence in the established region, suggesting that C. orbiculatus favours locally high locations.…”

Section: O D E L a S S E S S M E N Tmentioning

confidence: 99%

The spatial legacy of introduction: Celastrus orbiculatus in the southern Appalachians, USA

Albright

Anderson

Keuler

et al. 2009

Journal of Applied Ecology

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Summary 1. A variety of abiotic, biotic, human and historic variables related to environmental suitability and propagule pressure determine the distribution of invasive plants in a landscape. Understanding the role of these variables for invasive species is challenging because environmental variables are often correlated, many invaders have broad ecological niches, and invasive distributions are often highly dynamic. 2. We examined the role of environmental variables at multiple spatial scales on the distribution of an invasive vine Celastrus orbiculatus (Celastraceae) in the southern Appalachians, USA. Using existing and newly collected occurrence data, we constructed spatial generalized linear mixed models of C. orbiculatus occurrence in the whole region as well as the areas nearest (established zone) and farthest (pioneer zone) from the purported introduction locus. 3. For the entire study region, distance from the introduction locus and terrain slope were negatively related to the probability of occurrence of C. orbiculatus. The model was highly discriminatory, with an area under the receiver‐operating characteristic curve of 0·91. 4. Distance from introduction locus and slope were also important in the models for the pioneer and established zones respectively. 5. The pioneer zone model also indicated a negative relationship with elevation and the established zone model indicated a positive relationship with local topographic position, but these models were less discriminatory. 6. Synthesis and applications. Distance from introduction locus was the most powerful variable examined, suggesting an enduring legacy of introduction for the current distribution of C. orbiculatus. The varying results in the three zones highlight the importance of accounting for both introduction history and uneven propagule pressure in studies of observed invasive species distributions. The observed relationships with distance and elevation suggest that land managers should prepare for C. orbiculatus to expand its distribution in the region over time and with a warming climate.

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New Approaches for Volunteer Data Collection and Analysis − The Invasive Plant Atlas of New England

Cited by 3 publications

References 0 publications

Pathways of introduction of the invasive aquatic plant Cabomba caroliniana

Pathways of introduction of the invasive aquatic plant Cabomba caroliniana

Identifying hotspots for plant invasions and forecasting focal points of further spread

The spatial legacy of introduction: Celastrus orbiculatus in the southern Appalachians, USA

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