Objective 2: Meta-review of fish taxa
We conducted broad and succinct reviews of sticklebacks, PST, and lampreys that focused on books, book chapters, review articles, and other peer-reviewed literature to provide and describe the number of species, their evolution, trait diversity, and use of terms to describe ISD. We chose to do a meta-literature review because the exponential increase in articles for these species (e.g., Wootton 2009) rendered exhaustive reviews untenable for the scope of this paper.