Disturbance regimes and life-history evolution

Area of Science:

• Ecology
• Evolutionary Biology
• Theoretical Ecology

Background:

• Disturbance regimes are crucial ecological factors, yet their evolutionary impacts on life-history strategies remain understudied.
• Understanding how environmental disturbances shape organismal evolution is key to predicting ecological dynamics.

Purpose of the Study:

• To develop a model integrating disturbance dynamics with evolutionary life-history theory.
• To predict optimal organismal responses to varying disturbance regimes, including body size and maturation timing.

Main Methods:

• Developed a theoretical model combining within- and among-season disturbance dynamics with life-history theory.
• Analyzed the effects of disturbance timing, frequency, predictability, and severity.
• Explored both coarse-grained and fine-grained disturbance scenarios.

Main Results:

• Infrequent or unpredictable disturbances have minimal evolutionary effects despite high mortality.
• Disturbance regimes can synchronize metamorphosis, leading to seasonal declines in body size at maturity.
• Severe, coarse-grained disturbances have a greater evolutionary impact than fine-grained ones, highlighting population structure's role.

Conclusions:

• Disturbance regimes significantly influence the evolution of life-history strategies, particularly body size and maturation.
• Population structure is a critical evolutionary factor when disturbances are severe and coarse-grained.
• Model predictions offer novel insights into the interplay between environmental disturbances and evolutionary adaptation.