Variation in resource acquisition and utilization traits between native and invasive perennial forbs

Area of Science:

• Ecology
• Plant Biology
• Invasive Species Research

Background:

• Invasive species pose significant ecological and economic threats.
• Understanding traits that confer competitive advantages is crucial for management.
• Nutrient acquisition and efficiency are key in nutrient-limited ecosystems.

Purpose of the Study:

• To compare nutrient acquisition and utilization between native and invasive perennial forbs.
• To investigate how nutrient distribution (heterogeneous vs. homogeneous) affects plant responses.
• To identify specific functional traits contributing to invasive success.

Main Methods:

• Evaluated morphological and physiological responses of four native and four invasive species.
• Exposed plants to heterogeneous (patch) and homogeneous (control) nutrient conditions.
• Measured root biomass allocation, root length distribution, leaf nitrogen content, and photosynthetic rates.

Main Results:

• Invasive species allocated more biomass to roots and directed proportionately more root length to nutrient-rich microsites.
• Invasives exhibited higher leaf nitrogen, photosynthetic rates, and photosynthetic nitrogen use efficiency than natives.
• Significant variation in traits was observed among native forbs.

Conclusions:

• Invasive perennial forbs possess traits enabling superior nutrient acquisition and utilization in low-nutrient environments.
• Functional trait variation within native communities may be a more robust predictor of invasion resistance than community composition alone.
• These findings aid in predicting and managing invasive species spread.