Population-specific demography and invasion potential in medfly

Area of Science:

• Ecology
• Evolutionary Biology
• Invasive Species Management

Background:

• Biological invasions are a critical aspect of global change.
• The Mediterranean fruit fly (medfly) is a model invasive species due to its wide distribution, economic impact, and documented invasion history.

Purpose of the Study:

• To test if medfly populations from different global regions have diverged in immature life-history traits (survival, development).
• To assess if these populations exhibit varying population growth rates.
• To understand how these differences influence invasion potential.

Main Methods:

• A common garden experiment was used to compare medfly populations from six global regions.
• Immature life history data were combined with adult data from a previous study.
• Population parameters, including intrinsic rate of increase, were calculated.

Main Results:

• Significant differences were observed in preadult survival and developmental rates among global medfly populations.
• Medfly populations exhibited significant variations in population growth rates (intrinsic rate of increase).
• Geographically distinct populations possess different invasion potentials.

Conclusions:

• Geographic isolation has led to divergent life-history traits and population growth rates in medfly populations.
• These variations directly influence the establishment and spread stages of invasion.
• Findings offer crucial insights for developing effective suppression and management strategies for medfly worldwide.