Characteristics of successful alien plants

Area of Science:

• Ecology
• Invasive Species Biology
• Plant Trait Research

Background:

• Early research on alien plant invasion success, like Herbert Baker's 'ideal weed' concept, has generated numerous studies on species traits.
• However, varied methodologies have led to confusion and criticism regarding the true drivers of invasion success.
• A refined approach is needed to address the complexity of invasion processes.

Purpose of the Study:

• To propose a refined, question-based schema for understanding alien plant invasion success.
• To identify key species traits and attributes relevant to each stage of the invasion process.
• To predict how successful invaders differ from native and unsuccessful alien species.

Main Methods:

• Developed a schema of nested, conditional questions addressing different stages of plant invasion.
• Identified species traits predicted to influence success at each stage.
• Organized existing empirical studies based on the schema to evaluate trait importance predictions.

Main Results:

• Existing research on plant traits has provided substantial insights into alien plant success.
• The proposed schema helps to structure and interpret findings from trait-based studies.
• Predictions regarding trait differences between successful and unsuccessful aliens can be tested within this framework.

Conclusions:

• A refined, question-driven approach is crucial for advancing our understanding of alien plant invasion.
• Focusing on the multistage and multiscale nature of invasions clarifies the role of species traits.
• Future trait research should be guided by appropriate questions, scales, and comparators to yield robust insights.