FISH 423 Lecture Notes - Lecture 1: Great American Interchange, Propagule, Species Pool
21 Jan 2021
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Pictures from lecture slides on class canvas website. A species, subspecies, or lower taxon introduced outside of its normal geographic distribution; includes any part, gametes, seeds, eggs, or propagules of such species that might survive and subsequently reproduce. Militaristic terms and war metaphors often used. Become invasive when they serve no use for humans. Most ecologist consider species invasions to be one of the greatest environmental threats facing humanity. Panama rose up, connecting north and south america, allowed for migration and exchange. Different stages represent biologically identifiable steps along the path to becoming an invasive species. To begin the invasion process, a species within its region of origin is entrained by a transport vector that introduces it outside its range. Most species fail to become entrained by a vector or die in transit, therefore, only a small subset of the native species pool is introduced into a foreign region.
