Data and code used in the manuscript:
Hamilton AM, Selwyn JD, Hamner RM, Johnson HK, Brown T, Springer SK, Bird CE. Biogeography of shell morphology in overexploited shellfish reveals adaptive tradeoffs on human inhabited islands and incipient selectively driven lineage bifurcation. J Biogeogr. 2020;00:1–16. https://doi.org/10.1111/jbi.13845