Does Variation in Life History and Evolutionary Response Affect Species Vulnerability to Climate Change? Implications for Management
Climate change poses a variety of threats to biodiversity. Most efforts to assess the likely impacts of climate change on biodiversity try to rank species based on their vulnerability under changed environmental conditions. These efforts have generally not considered the ability of organisms to adjust their phenotype to the changing environment. Organisms can do this one of two ways. First, they can adjust their phenotype via non-evolutionary pathways. Second, they can undergo adaptive evolutionary change. We used two interconnected approaches to evaluate thermal adaptation capacity in a cold-water fish species. 1) Using tagging data, we estimated thermal performance curves for wild fish. The curves indicate how fish body growth will respond to changing temperatures. 2) Using genomic approaches, we developed a unified single nucleotide polymorphism (SNP) panel for use across the species’ range to examine adaptive capacity. This panel can be used for high throughput genotyping of individuals to understand genetic diversity, health, and potential for thermal adaptation. Additionally, with the SNP panel we provide a valuable resource to the community of researchers working on Brook Trout conservation and management. The SNP panel will make it possible for individual datasets collected across the range to be standardized so that they can be used to examine both local processes and range wide patterns. Overall, our results help us understand how Brook Trout will respond to a changing climate.