Management Of Invasive Alien Plants Research Articles

Invasive Alien Plant Management: Attitude and Insights from Initao-Libertad Protected Landscape and Seascape, Misamis Oriental, Philippines

Invasive Alien Plant Management: Attitude and Insights from Initao-Libertad Protected Landscape and Seascape, Misamis Oriental, Philippines

Review of Invasive Plant Functional Traits and Management Using Remote Sensing in Sub-Saharan Africa

Biodiversity and sustainable development in Sub-Saharan Africa (SSA) are considerably impacted by invasive alien plants (IAPs). Increasing plant invasions in SSA threaten agricultural productivity, biodiversity conservation, and other socioeconomic activities, which in turn put the United Nations Sustainable Development Goals (SDGs) in peril. In order to effectively combat IAPs, understanding their functional traits (morphological, physiological, and phenological traits) and integrating them into remote sensing (RS) is vital. While functional traits influence IAPs’ fitness to invade and establish in a new geographical range, RS aids in studying them remotely, delineating and mapping them, and predicting their potential invasions. The information on this study topic was gathered by reviewing various existing studies published between 2000 and 2024. Based on this review, it was deduced that the majority of IAPs are fast-growing (or acquisitive), with a shorter leaf lifespan, bigger leaves, and higher plant height, ultimately resulting in a higher resource acquisition ability. We established further that in SSA, there are limited studies on IAP functional traits and their integration in RS. Many studies conducted in the region focus mostly on IAP distribution. Evidence from prior studies revealed that functional trait remote sensing (FTRS)-based research not only improves detection and mapping but also predicts whether a certain alien plant can become invasive or expand its distribution range. Thus, using the FTRS approach could help IAP management in SSA, ultimately achieving the SDGs. Our review discusses IAP implications in SSA (e.g., Angola, Tanzania, Benin, Kenya, Uganda, Rwanda, Zambia, Burundi, Zimbabwe, Botswana, Malawi, etc.) and for the achievement of SDGs; functional traits and their impact on alien invasions; and the importance of incorporating functional traits into RS.

The greater the proportion of Robinia pseudoacacia in a stand the greater its effect on the population characteristics of Erythronium dens-canis

Management of invasive alien plants is an increasing problem throughout the world. In some cases native rare or protected species can appear or even prefer habitats dominated by invasive alien plants, which raises questions about the optimal treatment of such areas. Erythronium dens-canis in Hungary is a protected species which only have several occurrences in the country and a number of these populations situated in Robinia pseudoacacia stands developed after harvesting native forests. In this study a total of five populations of E. dens-canis were surveyed between 2020 and 2022 in southwestern Hungary examining and comparing the ongoing demographic changes under native and Robinia stands by monitoring individual plants. Two populations were situated in forests composed of native tree species, two in Robinia pseudoacacia-dominated stands and one in a Robinia-native tree species mixed stand. We categorized the plants into five age-state categories: dormant, seedling, juvenile, vegetative adult, and reproductive adult. We found some considerable differences (e.g. leaf size, reproduction rate) between the populations situated in native and in Robinia stands, whereas the population in mixed forest showed intermediate character in most examined factors. Based on our results, R. pseudoacacia have a significant effect on the phenology and life history of E. dens-canis, and this effect is greater with higher proportion of R. pseudoacacia in a forest stand where the E. dens-canis occurs.

Corrigendum: Withdrawal of Standard PM 3/67(1) Guidelines for the management of invasive alien plants or potentially invasive alien plants which are intended for import or have been intentionally imported

Corrigendum: Withdrawal of Standard <scp>PM</scp> 3/67(1) <i>Guidelines for the management of invasive alien plants or potentially invasive alien plants which are intended for import or have been intentionally imported</i>

Assessing Alien Plant Invasions in Urban Environments: A Case Study of Tshwane University of Technology and Implications for Biodiversity Conservation

Preserving the dwindling native biodiversity in urban settings poses escalating challenges due to the confinement of remaining natural areas to isolated and diminutive patches. Remarkably scarce research has scrutinised the involvement of institutions, particularly universities, in introducing alien plant species in South Africa, thus creating a significant gap in effective monitoring and management. In this study, the Tshwane University of Technology in Tshwane Metropole, South Africa serves as a focal point, where we conducted a comprehensive survey of alien plants both within the university premises and beyond its confines. The investigation involved the classification of invasion status and a meticulous assessment of donor and recipient dynamics. Our findings encompass 876 occurrence records, revealing the presence of 94 alien plant species spanning 44 distinct families. Noteworthy occurrences among the dominant plant families are Asteraceae and Solanaceae. Herbaceous and woody plants emerged as the most prevalent alien species, with common representation across both sampling sites. A substantial majority of recorded species were initially introduced for horticultural purposes (51%) before escaping and establishing self-sustaining populations (62%). Furthermore, 43 species identified are listed in South African invasive species legislation, with some manifesting invasive tendencies and altering the distribution of native species in the remaining natural areas. The notable overlap in species observed between the university premises and adjacent areas provides crucial insights into the influence of institutions on the dynamics of plant invasions within the urban landscape. This underscores the prevailing gaps in the management of invasive alien plants in urban zones and accentuates the imperative of an integrated approach involving collaboration between municipalities and diverse institutions for effective invasive species management in urban environments.

Optimizing the Benefits of Invasive Alien Plants Biomass in South Africa

The current political situation in South Africa is seeking opportunities to promote sustainable development and use of renewable resources for energy, poverty alleviation, economic development, and environmental protection (e.g., mitigation of greenhouse gas emissions). The present study is based on a critical literature review and synthesis of policy advice in South Africa. The study comprehensively examined the knowledge base and gathered relevant empirical findings and perspectives so as to identify the gaps, trends, and patterns in the optimal management and utilization of invasive alien plants (IAPs) biomass, thereby supporting evidence-based practice. Additionally, the literature review was supported by the first-hand experience of invasive alien plants management and its biomass utilization. This research proposes long-term options for optimizing the costs and benefits of invasive alien plants biomass and meeting rising energy demand. Biomass from the country’s approximately 300 “Working for Water (WfW) Projects” might be used for bioenergy, firewood, charcoal, and other value-added forest products, both for internal and international use. The extraction and use of biomass from invasive alien plants for green energy and other valuable products would aid in the elimination of hazardous invasive species and reduce the amount of fuel in the fields, as well as fire and flood threats. Biomass from invasive alien plants clearings can be distributed to rural regions and informal settlements as a supply of firewood with the aim of reducing reliance on nearby forests, conserving the environment and biodiversity, minimizing forest degradation, supporting climate change, and enhancing energy efficiency and wood waste management (e.g., recycling and prevention) for green economic development and industrial transformation. The findings of this study imply that for competitive biomass-to-energy conversion and bio-economic applications for the use of invasive alien plant biomass, cost management, particularly for transportation, and significant regulatory incentives are essential. In addition, effective policy instruments that aid in the promotion of innovative systems and knowledge generation are required so that biomass can be optimally used for bioenergy and other competitive bio-economic applications.

Heat Treatment of Seeds to Control Invasive Common Ragweed (Ambrosia artemisiifolia), Narrow-Leaved Ragwort (Senecio inaequidens) and Giant Hogweed (Heracleum mantegazzianum)

The intended or unintentional transport of soil material contaminated with weed seeds is one of the most important drivers in the spreading dynamics of invasive alien plants (IAPs). This phenomenon can be observed at any kind of construction site. Typical transfer of soil contaminated with IAP seeds can be observed along with road construction (soil translocation) or road maintenance services (deposit of mown plant biomass). Thus, an effective inactivation of these seeds by heating can avoid the spread of IAPs substantially. In the present study, the effects of various thermal control techniques (dry air heating and wet heating with hot steam, hot water, and hot foam) on seed survival of the widespread European IAPs common ragweed (Ambrosia artemisiifolia), narrow-leaved ragwort (Senecio inaequidens), and giant hogweed (Heracleum mantegazzianum) are discussed. Dry and wet seeds which were either uncovered or covered with soil were tested for survival at different treatment temperatures and different exposure times. Results revealed that particularly dry seeds of all three species could withstand temperatures of 100 °C for at least 6 h in climate chambers. Dry seeds of common ragweed and narrow-leaved ragwort survived exposure times of up to 48 h. Wet seeds were significantly more susceptible to heat treatments. Giant hogweed seeds were completely killed after 12 h at 70 °C. The exposure of IAP seeds to hot water was generally more effective than the treatment with hot steam. The treatment with hot foam was only effective when seeds were lying unprotected on the soil surface. Dry seeds of all the three species survived hot foam application in the field when they were covered by vegetation and leaf litter or soil. Due to the robustness of the seeds, a preventive management of IAPs by an efficient control before seeds formation is substantial to avoid their further dispersal.

Present status, future trends, and control strategies of invasive alien plants in China affected by human activities and climate change

Invasive alien plants (IAPs) have serious environmental and economic impacts, especially in vulnerable areas of China. However, IAP richness distribution patterns, their driving factors, and the dynamic shifts in potential distribution areas remain elusive. We assessed IAP richness distribution patterns and drivers using 402 IAPs recorded in China at 88 926 occurrence points, and then predicted their potential distribution areas. The results show that IAP hotspots were mainly located in southeastern China, especially coastal areas of the South and East and large inland cities. Population density, gross domestic product (GDP), and four climate variables associated with precipitation and temperature jointly influenced the richness distribution pattern of all IAPs. Specifically, population density and GDP impacted the richness distribution pattern of narrow‐range IAPs, and population density, GDP, distance to the nearest national highway, and five climate variables affected the richness distribution pattern of widespread IAPs. Only GDP contributed significantly to the richness distribution pattern of the top 5% hotspot grid cells, whereas population density, GDP, and precipitation in the driest month (BIO14) significantly influenced the richness distribution patterns of hotspots for both the top 10% and top 20%. Prediction analysis demonstrated that southeastern China would have particularly high invasion risk under both current and future climate scenarios. Regions with increases in predicted species richness are more common (44.83–64.97%) than those with decreases, except under the Representative Concentration Pathway (RCP) 4.5 scenario. Climate change will contribute greatly to the expansion of potential IAP distribution areas under both optimistic (RCP 2.5) and pessimistic scenarios (RCP 8.5). The results of this study provide insights into the priority management of IAPs by developing promising strategies for the control and prevention of IAP invasion.

Spatial scale matters for predicting plant invasions along roads

Abstract Biological invasions threaten global biodiversity and can have severe economic and social impacts. The complexity of this problem challenges effective management of invasive alien species as the contribution of many factors involved in the invasion processes across different spatial scales is not well understood. Here, we identify the most important determinants associated with the occurrence of two invasive alien plants, the North American goldenrods (Solidago canadensis and S. gigantea), commonly found in agricultural landscapes of Europe. We used Google Street View images to perform a remote, large‐scale inventory of goldenrods along 1347 roadside transects across Poland. Using open access geospatial data and machine learning techniques, we investigated the relative role of nearly 50 variables potentially affecting the distribution of studied species at five spatial scales (from within 0.25 to 5 km of the studied locations). We found that the occurrence of goldenrods along roadsides was simultaneously associated with multiple drivers among which those related to human impacts, climate, soil properties and landscape structure were the most important, while local characteristics, such as road parameters or the presence of other alien plants were less influential. However, the relative contribution of different variables in predicting goldenrod distribution changed across spatial scales. Synthesis: Mechanisms underlying plant invasions are highly complex and a number of factors can jointly influence the outcomes of this process. However, since different invasion drivers operate at different spatial scales, some important associations may be overlooked when focusing on a single spatial context. Although associations were consistent in direction (positive or negative) across scales, their relative influence on goldenrod occurrence often changed. Socio‐economic factors were largely important at local scales, while the effect of landscape factors broadly increased with increasing spatial scale. We highlight that using multi‐scale approaches involving a wide range of variables may enable setting priorities for the management of invasive alien plants.

Perceptions of impacts and management of invasive alien plants: a case study from Mirzapur, India

Invasive alien plants (IAPs) have become a serious threat to biodiversity, agriculture and socio-economic development. Several aspects, including the ecological and economic impacts of IAPs have been explored in the recent past, however, perceptions of ecosystem services (ES) and ecosystem disservices (EDS) have not been well studied. IAPs affect the lives of local people both positively (providing ES) and negatively (providing EDS). IAPs in this region have not been studied through the aspects of ES and EDS that integrate the views and perceptions of local communities. Keeping in view this research gap, the present study was conducted in the Mirzapur district (Uttar Pradesh, India) where IAPs are widely distributed. In five sites covering a rural to urban gradient with increasing distance from forest, we randomly selected 100 respondents–20 from each of the five sites for the survey. A semi-structured questionnaire was used to collect respondents’ perceptions on ES and EDS supplied by IAPs in their local habitats. The questionnaire was designed to obtain data on awareness and knowledge, perceptions of ES and EDS, attitudes toward management, and socio-demographic information. Results indicated that 95% of respondents were familiar with at least one of the 12 IAPs identified as being important in the region. Ipomea carnea and Stylosanthes hamata were the most and least frequently cited plants, respectively. Medical use and reduction in soil fertility were most perceived as ES and EDS, respectively. The value of Spearman’s rank correlation coefficient (Spearman’s ρ = 0.487, p &amp;gt; 0.05) indicates a non-significant correlation between ranks of ES and EDS cited by respondents. Older and less educated people were more aware of the impacts of IAPs. Uprooting was the most commonly used management practice to control the invasion of plant species. People’s attitudes toward the management of IAPs seem to indicate that they prefer to eradicate species that have direct harmful effects on human health and biodiversity. This study provides inputs for incorporating people’s perceptions into the control and management of IAPs in the forest region.

Rural peoples’ perception, attitude, and engagement on invasive alien plants in Mount Manunggal, Cebu Island, Philippines

This research examines the perceptions of rural residents of Mount. Manunggal, Cebu Island, Philippines, on the impact of unintentionally introduced invasive alien plants, such as Mikania micrantha, Lantana camara, and Chromolaena odorata, on their livelihoods. Results suggest that their perception of the impact of each species on their livelihood varies based on criteria such as: (1) the length of time invasive alien plants have been established in the forest, and (2) the kind of household. In addition, a household study revealed that forest-adjacent homes have reacted to invasive alien plants as both victims and beneficiaries. Most of the surveyed 77 families are likely to adapt to the invaded environment because they have a history of interacting with invasive alien plants and regard them as wonderful sources of necessities if appropriately involved. In addition, the data demonstrated rural residents are eager to invest in the control and management of invasive alien plants provided the government provides standardized and adequate technical methods and skills. Without government and stakeholder assistance, decreasing the invasion is seen as impossible, and the acceptance of invasive alien plants as part of the rural ecology is foreseen as a predictable result.

Sweet potato (Ipomoea batatas) and hyacinth bean (Lablab purpureus) in combination provide greater suppression of mile-a-minute (Mikania micrantha) than either crop alone.

In natural systems, diverse plant communities tend to prevent a single species from dominating. Similarly, management of invasive alien plants may be achieved through various combinations of competing species. We used a de Wit replacement series to compare different combinations of sweet potato (Ipomoea batatas (L.) Lam), hyacinth bean (Lablab purpureus (L.) Sweet) and mile-a-minute (Mikania micrantha Kunth) through measures of photosynthesis, plant growth, nutrient levels in plant tissue and soil, and competitive ability. Cultured alone sweet potato and hyacinth beans exhibited higher total biomass, leafstalk length, and leaf area than mile-a-minute. In mixed culture, either sweet potato or hyacinth bean or both together significantly suppressed the mile-a-minute parameters, i.e., plant height, branch, leaf, adventitious root, and biomass (P<0.05). Based on a significantly lower than 1.0 relative yield of the three plant species in mixed culture, we showed intraspecific competition to be less than interspecific competition. Calculated indices (relative yield, relative yield total, competitive balance index, and change in contribution) demonstrated a higher competitive ability and higher influence of either crop compared to mile-a-minute. The presence of sweet potato and hyacinth bean, especially with both species in combination, significantly reduced (P<0.05) mile-a-minute's net photosynthetic rate (Pn), antioxidant enzyme activities (superoxide dismutase, peroxidase, catalase, and malondialdehyde), chlorophyll content, and nutrient content (N, P, and K). In soil with mile-a-minute in monoculture soil organic matter, total and available N, total and available K, and available P were significantly greater (P<0.05) than in soil with sweet potato grown in monoculture, but less than in soil with hyacinth bean grown in monoculture soil. Nutrient soil content was comparatively reduced for plant mixtures. Plant height, leaf, biomass, Pn, antioxidant enzyme activities, and plant and soil nutrient contents of sweet potato and hyacinth bean tended to be much greater when grown with two crops compared to in mixture with just sweet potato or hyacinth bean. Our results suggest that the competitive abilities of both sweet potato and hyacinth bean were greater than that of mile-a-minute, and also that mile-a-minute suppression was significantly improved via a combination of the two crops compared to either sweet potato or hyacinth bean alone.

Collaborative Adaptive Stewardship for Invasive Alien Plants Management in South Africa

This study examined the knowledge of Collaborative Adaptive Stewardship (CASt) to advance Invasive Alien Plants (IAPs) management in South Africa. This concept promotes the involvement of private landowners and other stakeholders in the management and action processes, hence promoting social inclusivity, job creation, and sustainable biodiversity stewardship. It demonstrates that landowners are major stakeholders in IAPs management, thereby practising biodiversity stewardship in the 80% of privately owned lands of the country. The involvement of landowners in the management process aids in the prevention of further expansion of IAPs, the mitigation of risks (such as fire and flooding), and the maintenance of ecosystem functionality and landscape-scale connectivity. CASt fosters synergy among many stakeholders for the management of IAPs and long-term sustainable biodiversity stewardship. In South Africa, a number of landowners have entered into stewardship agreements as a result of incentives and subsidies for IAPs management. The benefits should be contingent on private landowner actions to IAPs management; this will support biodiversity stewardship. This study serves as a foundation for collaborative IAPs management and will be crucial in achieving long-term sustainability goals (e.g., economy, society and environment) to protect biodiversity and ecosystem services.

Remote Sensing and Invasive Plants in Coastal Ecosystems: What We Know So Far and Future Prospects

Coastal environments are highly threatened by invasive alien plants (IAP), and Remote Sensing (RS) may offer a sound support for IAP detection and mapping. There is still a need for an overview of the progress and extent of RS applications on invaded coasts that can help the development of better RS procedures to support IAP management. We conducted a systematic literature review of 68 research papers implementing, recommending, or discussing RS tools for IAP mapping in coastal environments, published from 2000 to 2021. According to this review, most research was done in China and USA, with Sporobolus (17.3%) being the better studied genus. The number of studies increased at an accelerated rate from 2015 onwards, coinciding with the transition from RS for IAP detection to RS for invasion modeling. The most used platforms in the 2000s were aircraft, with satellites that increased from 2005 and unmanned aerial vehicles after 2014. Frequentist inference was the most adopted classification approach in the 2000s, as machine learning increased after 2009. RS applications vary with coastal ecosystem types and across countries. RS has a huge potential to further improve IAP monitoring. The extension of RS to all coasts of the world requires advanced applications that bring together current and future Earth observation data.

Knowledge and perceptions of invasive plant biocontrol in Europe versus the rest of the world

Biological control (BC) of invasive alien plants (IAP) can be an effective environmental management approach. It has only very recently been adopted in Europe and is underutilized compared to other continents where this method has been successfully implemented for over a century. This is in sharp contrast to the BC of invertebrate pests, which has been taken up widely within Europe. It has been suggested that this is related to the risk-adverse attitude of Europeans towards weed BC. Scientific and public perception have a major influence on environmental policy actions. Public perception and knowledge regarding BC is an understudied subject despite its relevance for the application of this management alternative. We aimed to assess the knowledge and perception of BC of IAP among European professionals compared with their peers from other continents. To this end we conducted an online survey including multiple choice and open questions among over 700 people professionally engaged with managing the natural environment, of which approximately half were from Europe (EU) and the others from outside (non-EU). We assessed relationships between the geographical location of the respondents and their knowledge, and perceptions of BC of weeds versus BC of invertebrate pests. We found that respondents’ location influenced both perceptions and knowledge of BC for weeds. Compared to non-EU respondents, EU professionals showed less appreciation for BC (e.g., regarding safety, sustainability, and cost-effectiveness), and perceived it as a riskier method, particularly in the case of practitioners and researchers. More profoundly insect pest BC tended to be considered less safe than weed BC for non-EU respondents. Confidence in weed BC as a method, as well as in the validity of the associated pre-release risk assessments, strongly increased with the level of expertise in weed BC. While a much higher proportion of non-EU respondents were correctly aware of the presence/absence of BC in their own countries and identified successful examples of BC accurately, both groups of respondents were similarly aware of unsuccessful BC examples, including BC agents against animals, stressing the bias of EU respondents towards examples of BC failure. The appreciation of weed BC in Europe could be elevated by a combination of increasing knowledge of the technique and pre-release risk assessment and promoting successful examples of weed BC, which may bring major benefits for the management of IAP across the region.

Interpreting expert-judged priorities of invasive alien plant species by ex post weed risk scoring: A study in Japan

Prioritization for the management of invasive alien plants, a serious threat to biodiversity, often relies on judgment by expert scientists. While comprehensive, expert judgment may result in minimal explanations as to why certain species are prioritized over others and consequently may pose challenges for practitioners in justifying targeted species in their projects. In such cases, ex post scoring of weed risk may help uncover the logic behind experts’ comprehensive judgment, since it would enable us to link the assigned priority of species to explicit scores on various aspects of weediness. To rationalize existing expert-judged priorities, we conducted weed risk scoring of listed invasive alien plants in Japan, using the modified criteria of the post-border weed risk assessment system developed in Victoria, Australia. We scored 45 alien plant species with known expert-judged priorities for management (higher or lower) based on the assessment questions on invasiveness and impact. We then analyzed the correlations between the priority category and the questions and characterized the higher-priority species based on the scores of correlated questions. The higher-priority species showed greater total scores than the lower-priority species. The priority category was significantly correlated with specific questions on lifeform, growth rates, reproductive traits and impacts on social, environmental and agricultural assets. The higher-priority species identified by Japanese experts were aquatics causing damage to water flow and quality, and species that have shown superior capabilities for growth and reproduction and are displacing native species. Our results demonstrate that ex post scoring of the invasiveness and impact of listed alien plant species is a useful approach for interpreting the logic behind experts’ prioritization. Practitioners could better justify their targeted species for control by linking assigned priorities to scores of important questions on weediness.

Perceptions of the impacts of invasive alien plants in the riparian zone of the Ganga River: Insights from Varanasi, India

AbstractRiparian zones are among the most threatened habitats due to invasive species. Traditionally, studies on invasive alien plants (IAPs) of riparian zones have focused on their ecological implications. Studies assessing the impacts of IAPs on ecosystem services (ES) and ecosystem disservices (EDS) through people's perceptions are lacking in this habitat. This study was conducted in the riparian zone of the Ganga River in Varanasi, India. We used a questionnaire‐based survey to assess people's perceptions of IAPs and their potential to provide ES and EDS. Results indicated that residents were aware of IAPs and perceived these both positively (providing ES) and negatively (providing EDS). Soil stabilization and loss of native plant diversity were the most commonly perceived ES and EDS respectively. Socio‐demographic variables such as age and education shape people's perceptions of IAPs. Younger and educated respondents were more likely to perceive IAPs negatively. Respondents most commonly used fire as a practice to manage IAPs. They placedParthenium hysterophorusL. as the highest priority based on its impacts and management needs. This study highlights the need to incorporate public perceptions into the policy, planning, and management of IAPs, particularly in the riparian zone.

Prioritizing sites for terrestrial invasive alien plant management in urban ecosystems

Abstract Rapid urbanization is placing increased pressure on natural, restored and designed ecosystems to provide services to growing human populations. The establishment and spread of invasive alien species within and around urban areas threaten biodiversity and ecosystem functioning, and the services they provide. Consequently, there is a need to protect and manage areas where invasions will have the greatest socio‐ecological impact. Limited resources call for the strategic prioritization of these areas, yet there are few widely adopted, standardized approaches for prioritizing sites vulnerable to species invasions in urban areas. We applied multi‐criteria decision analyses in a geographic information system to develop a strategic, spatial prioritization approach for identifying those sites most sensitive to terrestrial alien plant invasions. To test this approach, we use the Toronto region as a case study, the most populous metropolitan area in Canada and one of the fastest growing urban centres in North America. Through consultation with local conservation authorities, we developed an objective, hierarchical set of 19 criteria grouped into two categories: biodiversity and ecosystem functioning, and ecosystem services. Spatial data layers were assigned to each criterion and used to map areas most important for biodiversity and ecosystem functioning and providing ecosystem services. We overlayed these priority areas with distribution data of Vincetoxicum rossicum, one of the Toronto region's most widespread and damaging invasive alien plant species (IAPs) to determine the potential threat species’ invasions pose to these important areas. High‐priority sites identified by our prioritization model include areas of significant biodiversity conservation value such as intact forests, meadows and wetlands which are crucial for providing regulating and supporting services. Our IAPs distribution map showed that these high‐priority sites are heavily invaded (92.9% of the area occupied by V. rossicum comprises medium‐high‐priority sites) and should be prioritized for management to ensure biodiversity and ecosystem functioning and the provision of ecosystem services are maximized. The approach applied in this study can be useful for conservation practitioners in guiding the selection of high‐priority, socio‐ecologically significant sites for management action in urban landscapes across different geographic regions and spatial scales.

Plant invasion risk in the Marine Protected Area of Tavolara (Italy)

Invasions by alien plants pose a significant threat to biodiversity, having negative impacts on species richness, community, and ecosystems. Protected areas and small islands could be particularly affected by the presence of non-native plants that pose high threats to their biodiversity. Several surveys were made under the life project “Puffinus Tavolara” (LIFE12 NAT/IT/000416) between 2014 and 2015 to detect the presence of non-native plant species in the Marine Protected Area of Tavolara (Sardinia, Italy). The aim of the present work was to produce an updated inventory of the alien flora of the Island of Tavolara and the nearby Isola Piana. A list of 58 non-native taxa was produced, assessing their accidental or voluntary introduction, residence and invasive status, and applying an adapted A-WRA and EPPO prioritisation methods on the alien flora of these islands. Importantly, the results of the two methods applied are quite different, but they are both useful and informative for the prioritisation and management of invasive alien plants.

Supporting the spatial management of invasive alien plants through assessment of landscape dynamics and connectivity

Invasive alien species are responsible for several negative impacts worldwide. Managing biological invasions is often difficult and the success rate is quite low, but with good planning it is possible to achieve good results. Besides employing the correct methods and techniques, an overall strategy based on landscape dynamics and expected spatial patterns can be fundamental to achieve success. The decision of where to act can be embedded in a general strategy based on several criteria/goals such as control of large populations, connectivity disruption, and so on. This work focused onAcacia dealbatain a Natura 2000 site in Portugal, how the current amount and distribution can affect the spread pattern, and different possible strategies to approach the management. Based on the species dispersal traits, we argue that not only the area but also the perimeter (therefore, the shape) and location of the patches should be considered when fighting the invasion. Three scenarios were designed and compared using the perimeter–area ratio, a landscape dynamics analysis, and a connectivity index. Results show that removing the patches with higher perimeter–area ratio (mostly small satellite patches) would be more impactful than removing the larger patch or removing random intermediary perimeter–area patches first. After this approach based on landscape dynamics, the employment of a connectivity assessment provided an ordered list of patches to remove sequentially. Overall, this approach can be valuable in the early steps of the planning process, supporting better decisions regarding the available resources and contributing to maximize the effectiveness of the action.