How do genetic correlations affect species range shifts in a changing environment?

Area of Science:

• Evolutionary Biology
• Ecology
• Population Genetics

Background:

• Species survival depends on responding to environmental changes.
• Adaptation and migration are key mechanisms for range shifts.
• Multitrait evolution influences adaptive responses to environmental heterogeneity.

Purpose of the Study:

• To investigate how adaptation, involving multiple quantitative traits, impacts species' range shifts under local selection and gene flow.
• To develop analytical expressions for local density and average trait values during range shifts.
• To identify conditions favoring faster environmental tracking, wider ranges, and greater local adaptation.

Main Methods:

• Mathematical modeling of adaptation with multiple quantitative traits.
• Analysis of spatial clines in trait evolution.
• Derivation of analytical expressions for population density and trait values.
• Investigation of the interplay between selection, gene flow, and genetic variation.

Main Results:

• Traits evolve spatial clines, sometimes in directions contrary to univariate predictions.
• Species maintain a constant lag in tracking their environmental optimum.
• Low spatial environmental variation and high multitrait adaptive potential facilitate faster shifts, wider ranges, and increased local adaptation.
• Weak nonlinear selection and high genetic variation in the direction of the selection gradient favor these adaptive responses.

Conclusions:

• Multitrait adaptation is crucial for species to effectively respond to changing environments.
• Environmental and genetic factors significantly influence a species' capacity for adaptation and range shifts.
• Understanding these dynamics is vital for predicting species' responses to global change and informing conservation strategies.