Biology of Invasive Plants: a new series within Invasive Plant Science and Management

© Weed Science Society of America, 2020. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/ by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Biology of Invasive Plants: a new series within Invasive Plant Science and Management


Series Outline
These reviews are intended to collate published and unpublished information on the biology and ecology of emerging plant invasion problems globally. They will assemble background information to lay a foundation reference source concerning the biology and ecology of the focal species. Furthermore, they will provide vital practical recommendations, highlighting invasion risks and their management.
This series builds on foundations laid in more regional series such as the Biology of Australian Weeds (Groves and Panetta 2014), Biology of Canadian Weeds (Cavers and Mulligan 1972), and Biology of Invasive Alien Plants in Canada (Warwick et al. 2003), and retains many of the features of these review series. The Biology of Invasive Plants series addresses the fact that biological invasions are a global problem. We want to provide a platform for identifying global risk patterns to alert biosecurity agencies and weed managers of emerging threats and to provide a consolidated resource to help manage these emerging threats.

Intended Audience
The Biology of Invasive Plants series is intended to provide a useful resource for a broad range of readers, including biologists, ecologists, risk assessors, policy advisers, and weed managers. The global nature of plant invasion risk means that this series should appeal to a global audience.

Guidelines for Authors
The Biology of Invasive Plants series covers all vascular plants that have demonstrated invasive behavior. Reviews may cover a single species or higher taxonomic grouping as appropriate. The purpose of this series is to (1) highlight global plant invasion risks, (2) provide a useful resource to inform efforts to prevent spread to new continents or jurisdictions, and (3) where this fails, to manage invasions.
Guidelines for the format of accounts are provided below. We recognize that each target taxon will vary in the amount and type of material available and the relative importance of different types of information to the prevention and management of spread and impacts. Inquiries about the format or advice on preliminary material should be directed to the series editors.
The reviews will be more valuable if they include previously unpublished material, and authors are encouraged to include new information. In general, authors should cite printed material or material that has a persistent URL or digital object identifier. Similarly, peerreviewed material is strongly preferred over "gray" literature.
Reviews are global in scope. In each section, commence with a global overview and then proceed to deal with each continent or region.

Proposals
If you wish to prepare a submission, you must first check that the species has not been assigned already. To help avoid duplication of effort, a list of taxa that are in the process of having reviews prepared will be maintained on the Invasive Plant Science and Management website. If your species of interest is not on the list of articles in process, please send an "offer of contribution" to the series coeditors at wssa@cambridge.org. If this is approved, you may proceed with preparing the manuscript. The completed manuscript is to be submitted directly to Invasive Plant Science and Management. You should correspond with the series coeditors with a progress update at least every 6 months. Approved offers may be withdrawn if the article is unlikely to be completed within a reasonable time frame.

Format
The format is broadly similar to the Biology of Alien Invasive Plants in Canada and Biology of Australian Weeds, though with a global scope and more emphasis on collating information that is relevant to managing the spread of the invasive species among continents and jurisdictions. Each submission should include a potential distribution model to alert biosecurity managers to invasion threats. These models may be previously published or developed de novo. Where a bioclimatic potential distribution model is developed de novo in support of a review, a structured appendix should be added, documenting the model so that its reliability can be gauged. A summary box, called "At a Glance : : : " will provide readers with the briefest introduction to the taxon and is intended to play the role of an abstract.
Reviews for a single species should not generally exceed 55 manuscript pages, including maps, diagrams, drawings, and photographs (12-point font, double-spaced, with numbered lines). Reviews covering multiple species may be a little longer. The completed manuscript should be submitted to Invasive Plant Science and Management and comply with the format and requirements of this journal.
Title Each review will be given a number when it is accepted for publication. The number will be part of the title and will precede the species name, for example, Biology of Invasive Plants 1. Pyracantha angustifolia (Franch.) C.K. Schneid.

Name and Taxonomy
Give the botanical name (genus, species, and nomenclatural authority) currently accepted by plant taxonomists, along with the derivation of the genus and species epithets. List the synonyms that are, or have been, commonly used. Where appropriate give the common names and the regions in which they are used. The following are some standard sources for botanical names: The World Checklist of Vascular Plants (WCVP): https://wcvp. science.kew.org/ Plants of the World Online (PWO): http://plantsoftheworldonline. org/ Tree of Life: http://www.tolweb.org/tree/ Global Biodiversity Information Facility: https://www.gbif.org/ Describe the taxonomy of the species, including a brief coverage of any significant revisions or controversy. Note whether any close relatives are reported to be invasive.

Importance
Describe the negative impacts and positive attributes of the species. These should be addressed broadly, covering economic, health, amenity, and environmental impacts. Readers should be able to appreciate why they should be concerned about the potential spread of this plant species and also to understand whether it is a "conflict" species.

Description
Briefly describe the species. Where possible, use simple terms rather than technical taxonomic terms and refer to photographs or diagrams to illustrate features. Include photographs or drawings of a mature plant, a seedling, and any persistent stages. The images should aid field diagnostics. If the appearance of any stage is affected significantly by factors such as chemical or cultural control, parasites, or diseases, these should be illustrated where possible. Include molecular identification methods if available.

Distribution
Describe the known native and introduced geographic ranges. If at all possible, compile a list of known locations from multiple sources such as the Global Biodiversity Information Facility (GBIF; www.gbif.org) and present these in the form of a map. Use the Robinson projection for the global map. Where appropriate, include larger-scale maps of regions where more detailed spatial information is available. Be careful to avoid including country or other administrative region centroids as points on the map. Where the species distribution is only known to the country or administrative region level, portray the administrative unit as a shaded polygon. Where possible, clearly distinguish between location records representing established populations from those that are transient or only present due to human cultural factors such as irrigation. The journal will provide some mapping resources to provide a consistent format for the maps. These resources include prepared map packages for use with QGIS and ArcMap, along with instructions for each of these packages on how to search for and download distribution data from GBIF, import them, and create and export a known distribution map for use in this account. This will help ensure that the maps are consistent in their formatting. Instructions will also be provided for importing a potential distribution model. For authors with limited knowledge of bioclimatic modeling, we will provide a very simple modeling tool based on the Köppen-Geiger climate classes. This tool will use point distribution data to identify climate types that have corresponding known distribution records. This tool can be used to identify climate and land-use types for inclusion in the Habitat section.

Habitat
List the Köppen-Geiger climate types that the plant inhabits and describe any climatic or microclimatic limitations or preferences in relation to temperature, soil moisture, or humidity. Describe stresses in terms of waterlogging or drought sensitivity and tolerance of heat and cold. Note any known relationships between climatic factors and the plant's phenology.
Use the FAO Land Use Systems of the World v. 1.1 (www.fao. org/nr/lada/) or similar spatial data to identify suitable habitat types. This list can be sourced by spatially intersecting the distribution data with the land-use data. This analytical list can be compared with published accounts. This cross-check can also be used to help identify errors in the distribution data.
Describe the soil types that are associated with the plant. Try to elucidate those specific factors that are positively or negatively correlated with the species distribution. For aquatic plants, describe what is known about the water qualities that promote or prevent the establishment of this species.
Describe the plant communities in which the plant is found and the effects of disturbance and land use on promoting or hindering the survival and establishment of populations of the plant. For example, is it found predominantly in horse paddocks and frequently disturbed areas such as roadsides?
Describe whether human cultural factors such as irrigation or any other specific agricultural or land management measures are supporting populations in otherwise inhospitable conditions.

Invasion History
Describe the history of spread of the plant species outside its native range. Where known, indicate the time of introduction in new regions. Comment on the rate of spread and describe the invasion pathway(s). Describe any eradication attempts, outlining the technologies employed, their success or otherwise, and any factors that promoted or hindered success.

Life-Form and Life History
Describe what type of life-form(s) and life-history patterns the species exhibits under different environments (e.g., annual forb, perennial shrub, or multi-stem tree). Identify the life strategy (stress tolerator, competitor, ruderal [sensu Grime 1979Grime , 1988Grubb 1998]) and life cycle of the plant. Include a diagram of the life stages.

Dispersal and Establishment
Explain how the species spreads at different spatial and temporal scales. Describe the factors associated with establishment of new populations.

Invasion Risk
Authors are strongly encouraged to include a map indicating the modeled global potential distribution. Use this model to highlight the areas at risk of invasion and any obvious significant assets at risk. The journal will supply mapping resources and some instructions to provide a consistent format for the maps. If the model of the species' potential distribution has been published elsewhere, then it is sufficient to refer to the publication where the model was described. If the model has been developed specifically to support this review, then sufficient information must be included in the structured appendix to allow the model to be evaluated. If a correlative species distribution model is used (e.g., Bioclim, Boosted Regression Trees, MaxEnt), particular attention should be paid to ensuring that the model is not misbehaving when being transferred between continents and carefully checking outlying records to identify records of casual populations or populations that are dependent on cultivation practices such as glasshouses or irrigation. These records should either be removed or the spatial cultivation process explicitly included in the model. The material to be included in the structured appendix is described below. For all models, close attention should be paid to checking the veracity and meaning of outlying records. These climatic outliers can have a profound impact on the resulting model. If they are records of the plant being found in cultivated locations, then they should generally be removed from the training data set, which should consist only of records that represent established populations. An exception to this is where the cultivated and non-cultivated risks are modeled separately and combined into a composite risk map.

Invasion Pathways
Describe how the species spreads between continents and regions.
Growth and Development Morphology. Describe any noteworthy morphological features that are important to the species identification and colonization or survival and explain their importance.
Stress Tolerance. Describe the species' mode of perennation and susceptibility to or tolerance of stressful conditions (e.g., oversummering, overwintering, waterlogging, salinity).
Ecophysiology. Explain how the plant responds to temperature, soil moisture, humidity, salinity, and mineral nutrition.
Phenology. Describe the times of growth and appearance of aboveand belowground organs. To give meaning to this material, the location of observations is critical. Where possible, relate the timing of phenophase shifts to proximal environmental data (e.g., daily maximum temperatures or daylength). Include any knowledge of thermal sum (degree day) requirements, including the relevant base temperature for calculations.
Mycorrhiza and Bacterial Symbionts. State whether mycorrhiza or bacterial symbionts are present or required, and if so, the type.

Reproduction
Floral Biology. Describe the pollination biology and ecology, listing any known pollinators. Comment on self-compatibility and describe how seeds are produced (autogamy, allogamy, or agamospermy or some combination of these). Is the plant capable of vivipary?
Seed Production and Dispersal. Describe the median number of seeds per fruit, inflorescence, and plant, preferably under a range of conditions. What is the median mass of seeds or propagules? Describe the mode of seed dispersal and the adaptive features that support that mode of dispersal.
Seedbanks, Seed Viability, and Germination. Describe the longevity of the seeds in the seedbank. Is the seedbank transient or persistent in different environments? Describe the germination patterns. If these observations are under natural conditions, indicate the geographic context. If based on laboratory studies, include the source of the seed if known. Describe any special conditions affecting germination (e.g., light regime, ruminant gut passage).
Vegetative Reproduction. If the plant reproduces vegetatively, describe the mode and rate of reproduction and spread. If the plant reproduces via different modes in different habitats, describe the conditions under which each mode is observed.

Population Dynamics
Describe the rate of increase and decline of populations in various habitats and seasonal conditions. Do more plants recruit or die in certain months or seasons or after changes in the habitat (e.g., drought, floods) or treatment or disturbance (e.g., after fire)? Include the mean life span of individuals in various habitats. Refer to population genetic information or molecular ecology if available.
Describe the plant's competitive ability (intraspecific and interspecific) and its method of competing with other plants.
Does the species usually occur as solitary plants, large patches, small patches, etc.?
Describe the recruitment frequency (e.g., the number of generations per year) in different environments.

Management Options
Phytosanitary Measures. Describe treatments or measures to prevent the spread of the species between continents or jurisdictions, and any examples of where these have been implemented.
Chemical. Describe how the species responds to chemicals or herbicides at different life stages. Where relevant, give a brief list of common herbicides that may be of use to control the plant. Note whether there have been any reports of herbicide resistance, and where these reports have originated.

Invasive Plant Science and Management 117
Cultural. Describe how the species responds to cultural control techniques such as mowing, controlled livestock grazing, crop rotation, harvesting, plowing, steam treatment, or fallowing.
Biological. How does the species respond to herbivory, diseases, or parasites? For each natural enemy, state the scientific name and authority and the degree of host specificity. Describe the life stage(s) affected, the type of impact, and the response of the plant population. Where possible, be careful to contextualize the knowledge in terms of the environmental conditions under which the results were observed.

General Outlook
Highlight the overall invasion risks to presently uninvaded continents, considering climate suitability, invasion pathways, and the feasibility of attenuating the pathway risks. Reflect on the global experience in managing invasions to date. Consider how future scenarios (e.g., global warming, changing land use) might impact the prognosis or risk profiles.

Measurements
Refer to the Invasive Plant Science and Management guidelines.  Table   MaxEnt The results in MaxEnt models (Phillips et al. 2006) tend to be very sensitive to the definition of the background. Hence you need to choose your background carefully and cite a published method or describe your method.
Choose "least presence threshold." Avoid using "clamping." This method implicitly violates the "law of tolerance" (reviewed in Shelford 1963). The most defensible method for models that involve transfer to new environments is "no extrapolation."