Adaptive Introgression in the Context of Climate Adaptation

Area of Science:

• Evolutionary biology
• Conservation biology
• Genetics

Background:

• Species face unprecedented environmental disruption, including climate change and mass extinction.
• Understanding adaptation mechanisms is crucial for biodiversity preservation.
• Adaptive introgression, the transfer of beneficial genetic variation between species, is a proposed mechanism for rapid adaptation.

Purpose of the Study:

• To review the evidence for adaptive introgression as a driver of climate adaptation.
• To assess the current understanding and methodological approaches for studying adaptive introgression.
• To identify research gaps and propose future directions.

Main Methods:

• Review of classical and recent methods for detecting introgression and selection.
• Analysis of approximately 20 published studies linking introgression to climate adaptation.
• Evaluation of taxonomic, geographic, and climate diversity in studied cases.

Main Results:

• Evidence suggests adaptive introgression played a role in adaptation to past climate oscillations (e.g., late Pleistocene).
• A significant gap exists between the theoretical importance of adaptive introgression and the number of functionally validated examples.
• Most studies focus on past climate adaptation rather than contemporary challenges.

Conclusions:

• Adaptive introgression is a plausible, yet under-documented, mechanism for species adaptation to environmental change.
• Further research is needed to functionally and ecologically validate adaptive introgression examples.
• Addressing this knowledge gap is critical for predicting adaptive potential under climate change and informing conservation strategies.