May 29, 2018

Mutation load dynamics during environmentally-driven range shifts

BioRxiv : the Preprint Server for Biology
Kimberly J GilbertLaurent Excoffier

Abstract

The fitness of spatially expanding species has been shown to decrease over time and space, but specialist species tracking their changing environment and shifting their range accordingly have been little studied. We use individual-based simulations and analytical modeling to compare the impact of range expansions and range shifts on genetic diversity and fitness loss, as well as the ability to recover fitness after either a shift or expansion. We find that the speed of a shift has a strong impact on fitness evolution. Fastest shifts show the strongest fitness loss per generation, but intermediate shift speeds lead to the strongest fitness loss per geographic distance. Range shifting species lose fitness more slowly through time than expanding species, however, their fitness compared at equivalent geographic distances spread can be considerably lower. These counter-intuitive results arise from the combination of time over which selection acts and mutations enter the system. Range shifts also exhibit reduced fitness recovery after a geographic shift and may result in extinction, whereas range expansions can persist from the core of the species range. The complexity of range expansions and range shifts highlights the potential for...Continue Reading

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Mentioned in this Paper

Environment
Anatomical Space Structure
Cell Growth
Tracking
Specialty Physician
Simulation
Species
Core
Mutation Abnormality
Biological Evolution

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