Evolutionary Dynamics in Fluctuating Environments

Evolutionary dynamics in fluctuating environments examines how temporal and spatial variations in conditions alter the course of adaptation, diversification and persistence of populations. Environmental fluctuations—whether periodic, stochastic or directional—reshape fitness landscapes by modifying selection intensities, altering trade-offs between growth and robustness, and influencing the maintenance of genetic variation. Organisms may evolve bet-hedging strategies, phenotypic plasticity or modular life-history traits to navigate unpredictable changes. The interplay of internal processes such as frequency-dependent selection and external drivers such as seasonality or resource pulses gives rise to complex outcomes, from stable polymorphisms and quasi-cycles to chaotic dynamics. Understanding these interactions is critical for predicting responses to climate change, managing pathogen evolution and conserving biodiversity under increasing environmental variability.

Research from Nature Portfolio

Recent studies have characterised how fluctuating reproduction rates shape fitness functions, showing that reduced sensitivity to environmental noise can offset the costs of slower growth and lead to greater long-term prosperity under high variability. Foundational work has demonstrated that environmental fluctuations accelerate fixation rates in neutral scenarios, thereby reducing effective population sizes inferred from genetic data. Complementary analyses of genotype–environment interactions reveal that spatial heterogeneity can confer an advantage to rare alleles, as anti-correlated fitness profiles across microhabitats boost their probability of fixation. Together these contributions highlight the importance of dissecting both the magnitude and frequency of environmental change to understand adaptive trajectories and the maintenance of diversity.

Evolutionary Dynamics in Fluctuating Environments publication trend

The graph below shows the total number of articles in evolutionary dynamics in fluctuating environments across all publications each year (not limited to Nature Index journals).

Technical terms

Fitness landscape: A representation of how reproductive success varies with genotype or phenotype under given environmental conditions.

Frequency-dependent selection: A form of selection where the fitness of a phenotype or genotype depends on its frequency within the population.

Genetic drift: Random fluctuations in allele frequencies due to chance events in finite populations.

Fixation probability: The likelihood that a new mutation will eventually reach a frequency of 100 % in a population.

Phenotypic plasticity: The ability of a genotype to produce different phenotypes in response to environmental variation.

Environmental stochasticity: Random temporal or spatial fluctuations in environmental factors affecting population dynamics and selection.

References

1. Frequency dependence and the predictability of evolution in a changing environment. Evolution Letters (2022).
2. The Impact of Environmental Fluctuations on Evolutionary Fitness Functions. Scientific Reports (2015).
3. Evolutionary dynamics in fluctuating environment. Physical Review Research (2020).
4. Genotype by random environmental interactions gives an advantage to non-favored minor alleles. Scientific Reports (2017).
5. Effective fitness under fluctuating selection with genetic drift. G3: Genes, Genomes, Genetics (2023).