Boom-bust dynamics -the rise of a population to outbreak levels, followed by a dramatic decline -have been associated with biological invasions and offered as a reason not to manage troublesome invaders. However, boom-bust dynamics rarely have been critically defined, analyzed, or interpreted. Here, we define boom-bust dynamics and provide specific suggestions for improving the application of the boom-bust concept. Boom-bust dynamics can arise from many causes, some closely associated with invasions, but others occurring across a wide range of ecological settings, especially when environmental conditions are changing rapidly. As a result, it is difficult to infer cause or predict future trajectories merely by observing the dynamic. We use tests with simulated data to show that a common metric for detecting and describing boom-bust dynamics, decline from an observed peak to a subsequent trough, tends to severely overestimate the frequency and severity of busts, and should be used cautiously if at all. We review and test other metrics that are better suited to describe boom-bust dynamics. Understanding the frequency and importance of boom-bust dynamics requires empirical studies of large, representative, long-term data sets that use clear definitions of boom-bust, appropriate analytical methods, and careful interpretations.

Species charisma, understood as a set of species characteristics and their perception that affect people's attitudes and behaviors, is a highly relevant concept for invasion science, with implications across all stages of the invasion process. However, the concept of invasive alien species (IAS) charisma has not yet been systematically investigated. Here, we discuss this concept, provide a set of recommendations for further research and highlight management implications. We review how charisma affects the processes associated with biological invasions and IAS management, including: effects on species introductions and spread, media portrayals, public perceptions of species management, research attention, and active public involvement in research and management. Explicit consideration of IAS charisma is critical to improve understanding of the drivers of people's attitudes towards particular IAS and planned management measures and strategies, and to implement programs aiming to influence stakeholder perceptions and behavior and to strengthen public engagement. In a nutshell • We discuss the concept of charismatic invasive alien species (IAS), highlight management implications and provide a set of recommendations for further research. • The charisma of IAS might influence all stages of the invasion process, and both charisma and its influence can vary over time and space. • It is a potential hindrance to management actions by affecting public support and contributing to conflicts. • We explore the concept of IAS charisma and its effects on biological invasions and management, including species introductions, media portrayal, public perceptions, opposition to management, research effort and public participation in research and management.

Managing the impacts of invasive alien species (IAS) is a great societal challenge. A wide variety of terms have been used to describe the management of invasive alien species and the sequence in which they might be applied. This variety and lack of consistency creates uncertainty in the presentation and description of management in policy, science and practice. Here we expand on the existing description of the invasion process to develop an IAS management framework. We define the different forms of active management using a novel approach based on changes in species status, avoiding the need for stand-alone descriptions of management types, and provide a complete set of potential management activities. We propose a standardised set of management terminology as an emergent feature of this framework. We identified eight key forms of management: (1) pathway management, (2) interception, (3) limits to keeping, (4) secure keeping, (5) eradication, (6) complete reproductive removal, (7)

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