Endemicity Quotes

“Throughout the over 200 years of the field of biogeography, its researchers have discovered some strikingly general patterns in biological diversity, and have advanced an equally intriguing set of explanations for the forces driving those patterns. Despite the many levels, qualitative features, and potential quantitative means of measuring biological diversity, the overwhelming majority of these studies have focused on just one or two relatively simple, but intuitively valuable measures—species richness and endemicity. Species richness is a simple count of the number of species in a particular area of interest (e.g. the number of fish in a pond, lake, or ocean basin). It is a direct, albeit simplistic expression of our innate value for the more complex. But our instinctive valuation of diversity is a bit more ecologically sophisticated than this, as it is also influenced by our apparently innate attraction to the rarest, most precious “gems” of the natural world.
A simple thought experiment should bear this out: given two assemblages with the same species richness—one comprising species common to most other ecosystems, and the other solely comprising endemics (so rare that they occur nowhere else), nearly all of us would be drawn to the latter assemblage because it has high endemicity. Beyond this instinctive attraction to the most rare, there clearly is a more pragmatic reason for valuing endemic species over the more broadly distributed (cosmopolitan) ones. If an endemic is lost from its assemblage, it disappears globally and the legacy of many thousands of generations of natural selection are irrevocably lost as well.”
― Mark V Lomolino, Biogeography: A Very Short Introduction