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Examining parallel and non-parallel components of lake-stream stickleback divergence on Haida Gwaii
Adam-Emmanuel Tremblay and Andrew Hendry
Recent studies on the threespine stickleback (Gasterosteus aculeatus) system have significantly advanced our knowledge of evolutionary processes. Still, new examples of evolutionary processes, like parapatric divergence, are needed to clarify and improve current knowledge. Past studies on two lake-stream pairs (Mayer and Drizzle) of the archipelago of Haida Gwaii, BC, Canada, suggest that the archipelago has high potential to lead to advances. Yet, most lake-stream pairs of the archipelago have never been studied, which limits our understanding of parapatric divergence in this area. Here, we aim to assess Haida Gwaii’s potential for parapatric divergence research by sampling new lake-stream pairs and highlighting new cases of parapatric divergence to compare Haida Gwaii to other areas of the stickleback range. We are doing this by conducting morphological and genetic analysis on stickleback populations from 14 lake-stream pairs, including the two previously studied.
