A model for a population of trees structured by phenological traits

Area of Science:

• Ecology
• Climate Change Biology
• Mathematical Biology

Background:

• Global warming necessitates adaptation in tree populations.
• Phenotypic plasticity and genetic evolution are key adaptation mechanisms.
• Understanding their interplay is vital for forest ecosystem management.

Purpose of the Study:

• To model tree population dynamics under environmental stress.
• To investigate phenological adaptation, specifically summer dormancy triggered by temperature thresholds.
• To analyze population responses to increased temperature and reduced precipitation.

Main Methods:

• Development of a detailed mathematical model for population dynamics.
• Reduction of the model to a system of two coupled ordinary differential equations.
• Numerical analysis of the simplified model under various environmental scenarios.

Main Results:

• Contrasting effects of water stress and temperature stress on population dynamics were identified.
• Phenotypic plasticity demonstrated an ambivalent effect on population responses.
• The model provides insights into tree adaptation strategies under climate change.

Conclusions:

• Tree populations exhibit complex responses to environmental shifts.
• Phenological adaptation, like summer dormancy, plays a critical role.
• The study underscores the need for nuanced management strategies considering both plasticity and genetic adaptation.