Life table invasion models: spatial progression and species-specific partitioning.

Area of Science:

• Ecology
• Invasive Species Biology
• Spatial Dynamics

Background:

• Biological invasions are significant drivers of global change, impacting biodiversity and economies.
• A unified conceptual model is needed to classify and compare invasion dynamics across species and regions.
• Invasion processes can be understood as transitions between discrete spatial units.

Purpose of the Study:

• To develop a unifying conceptual model for invasion dynamics.
• To analyze invasion patterns of tropical tephritids in California cities using a novel life-table method.
• To predict spatiotemporal invasion progression and provide early warnings for management.

Main Methods:

• Conceptualizing invasion as state transitions between pristine and invaded spatial units (California cities).
• Developing a life-table method with a progression model for invasion stage transition.
• Implementing a species-specific partitioning model for multispecies invasions.

Main Results:

• The progression model estimates city-specific transition probabilities and rates, distinguishing initial detection from recurrences.
• Recurrence intervals for invasive tephritids decrease as a city's invasion stage progresses.
• The species-specific partitioning model highlights varied invasion outcomes based on the initial species detected.

Conclusions:

• Two life-table invasion models offer new insights into invasion concepts, particularly state transitions and species roles.
• These models provide tools for predicting invasion spread and recurrent events.
• The research supports efficient management strategies for biological invasions.