Effects of Ligustrum sinense Lour. (Chinese Privet) on Abundance and Diversity of Songbirds and Native Plants in a Southeastern Nature Preserve

Wilcox, Joshua; Beck, Christopher W.

doi:10.1656/1528-7092(2007)6[535:eolslc]2.0.co;2

Cited by 43 publications

(40 citation statements)

References 14 publications

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“…Merriam found Chinese privet had a coefficient of association more than 50% higher for river and stream banks in North Carolina than would be expected if its distribution among different edge types was random or uniform [28]. This suggests that moist riparian soils provide suitable conditions and/or floods might be a seed-carrying mechanism for the seeds [6,28].…”

Section: Discussionmentioning

confidence: 99%

“…Hence, we might reasonably hypothesize that small Chinese privet seedlings might have been present but unnoticed by inventory crews in 2006, and first noticed as taller adult shrubs in 2011. However, Chinese privet does have the potential to disperse long distances via seed dispersal by songbirds [6,39]. Although not documented for Chinese privet, seed dispersal by birds has been estimated at around 1000 m [40] and 1200 m [41] for Chinese tallow (Triadica sebifera (L.) Small) in North Carolina and Texas, respectively, and around 5 km to 10 km for swamp privet (Forestiera acuminate (Michx.)…”

Section: Discussionmentioning

confidence: 99%

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Invasion of Eastern Texas Forestlands by Chinese Privet: Efficacy of Alternative Management Strategies

Wang

Grant

2014

Diversity

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Chinese privet (Ligustrum sinense) was the most prevalent invasive shrub in the forestlands of Eastern Texas in 2006. We analyzed extensive field data collected by the Forest Inventory and Analysis Program of the U.S. Forest Service to quantify the range expansion of Chinese privet from 2006 to 2011. Our results indicated the presence of Chinese privet on sampled plots increased during this period. Chinese privet spread extensively in the north. Results of logistic regression, which classified 73% of the field plots correctly with regard to species presence and absence, indicated probability of invasion was correlated positively with elevation, adjacency (within 300 m) to water bodies, and site productivity, and was correlated negatively with stand age, site preparation (including clearing, slash burning, chopping, disking, bedding, and other practices clearly intended to prepare a site for regeneration), artificial regeneration (which refers to planting or direct seeding that results in at least 50% of the stand being comprised of stocked trees), and distance to the nearest road. Habitats most at risk to further invasion (likelihood of invasion > 40%) under current conditions occurred primarily in Northeast Texas. Practicing site preparation and artificial regeneration reduced the estimated probabilities of further invasion.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Invasion of Eastern Texas Forestlands by Chinese Privet: Efficacy of Alternative Management Strategies

Wang

Grant

2014

Diversity

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“…This semievergreen to evergreen shrub is still widely used as a hedge, as it tolerates shade, heat, drought and the clay soils that are characteristic of the Piedmont. The shrub produces small bluishblack drupes in the late fall that are consumed by birds (Wilcox and Beck 2007) and deer (Stromayer et al 1998, Williams et al 2008. Invasion by Chinese privet is a threat to biodiversity because it is capable of forming dense thickets, which crowd out native vegetation and prevents forest regeneration (Merriam andFeil 2002, Hart andHolmes 2013).…”

Section: Study System and Target Speciesmentioning

confidence: 99%

Accounting for residential propagule pressure improves prediction of urban plant invasion

et al. 2016

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Abstract. Plant invasions substantially impact the ecosystem services provided by forests in urbanizing regions. Knowing where invasion risk is greatest helps target early detection and eradication efforts, but developing an accurate predictive model of invasive species presence and spread on the basis of habitat suitability remains a challenge due to spatial variation in propagule pressure (the number of individuals released) which is likely conflated with suitability. In addition to neighborhood propagule pressure that originates with propagules dispersing from naturalized populations within invaded habitats, we expect residential propagule pressure arising from the widespread use of exotic plants in the yards of single-family residences to be an important driver of invasions, and to notably improve the predictive accuracy of species distribution models (SDMs). To this end, we collected presence/absence data for a widespread forest invader, Ligustrum sinense (Chinese privet), from 400 stratified random plots located along an urban gradient across the Charlotte, North Carolina metropolitan area. We assessed the relative contribution of residential propagule pressure and neighborhood propagule pressure to improving the predictive performance of a probit SDM for Chinese privet that only contains environmental predictors. Our results indicate that, although the environment-only model predicted the highest geographic area to be at risk of invasion by privet, it also had the highest rate of failure to accurately predict observed privet occurrences as indicated by the omission (incorrectly predicted absence) and commission (incorrectly predicted presence) error rates. Accounting for residential propagule pressure substantially improved model performance by reducing the omission error by nearly 50%, thereby improving upon the ability of the model to predict privet invasion in suboptimal habitat. Given that this increase in detection was accompanied by a decrease in the geographic area predicted at risk, we conclude that SDMs for invasive exotic shrubs and potentially for other synanthropic generalist plants may be highly inefficient when residential propagule pressure is not accounted for. Accounting for residential propagule pressure in models of invasive plants results in a more focused and accurate prediction of the area at risk, thus enabling decision makers to feasibly prioritize regional scale monitoring and control efforts.

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“…Privets severely alter natural habitat and critical wetland processes, forming dense stands to the exclusion of most native plants and replacement regeneration. The abundance of specialist birds and the diversity of native plants and bees are dramatically reduced by privet thickets [41,42]. The dense thickets impact forest communities by shading and out-competing many of the native species.…”

Section: Privetmentioning

confidence: 99%

Habitat Modeling of Alien Plant Species at Varying Levels of Occupancy

Lemke

Brown

2012

Forests

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Distribution models of invasive plants are very useful tools for conservation management. There are challenges in modeling expanding populations, especially in a dynamic environment, and when data are limited. In this paper, predictive habitat models were assessed for three invasive plant species, at differing levels of occurrence, using two different habitat modeling techniques: logistic regression and maximum entropy. The influence of disturbance, spatial and temporal heterogeneity, and other landscape characteristics is assessed by creating regional level models based on occurrence records from the USDA Forest Service's Forest Inventory and Analysis database. Logistic regression and maximum entropy models were assessed independently. Ensemble models were developed to combine the predictions of the two analysis approaches to obtain a more robust prediction estimate. All species had strong models with Area Under the receiver operator Curve (AUC) of >0.75. The species with the highest occurrence, Ligustrum spp., had the greatest agreement between the models (93%). Lolium arundinaceum had the most disagreement between models at 33% and the lowest AUC values. Overall, the strength of integrative modeling in assessing and understanding habitat modeling was demonstrated. OPEN ACCESSForests 2012, 3 800

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Effects of Ligustrum sinense Lour. (Chinese Privet) on Abundance and Diversity of Songbirds and Native Plants in a Southeastern Nature Preserve

Cited by 43 publications

References 14 publications

Invasion of Eastern Texas Forestlands by Chinese Privet: Efficacy of Alternative Management Strategies

Invasion of Eastern Texas Forestlands by Chinese Privet: Efficacy of Alternative Management Strategies

Accounting for residential propagule pressure improves prediction of urban plant invasion

Habitat Modeling of Alien Plant Species at Varying Levels of Occupancy

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