Negative environmental perturbations may improve species persistence

Area of Science:

• Ecology
• Evolutionary Biology
• Population Genetics

Background:

• Small isolated populations face extinction risks from genetic deterioration and environmental variation.
• Previous models treated these threats separately, but empirical studies show inbreeding depression exacerbates environmental stress.

Purpose of the Study:

• To develop a stochastic model examining how environmental perturbations affect the persistence of populations with inbreeding depression and mutation accumulation.
• To investigate the paradoxical effects of negative environmental changes on species survival.

Main Methods:

• Developed a stochastic model incorporating inbreeding depression and mutation accumulation.
• Assumed deleterious mutations have more severe effects during environmental perturbations, aiding mutation load purging.

Main Results:

• Negative environmental perturbations can paradoxically improve middle- and long-term species persistence.
• This effect is dependent on the realistic frequency and severity distribution of perturbations.

Conclusions:

• Environmental variation and genetic factors interact dynamically, influencing population viability.
• Conservation strategies may need to consider the complex interplay between environmental stress and genetic health for species persistence.