To understand why it’s important for salmon management to focus on the individual population, we need to start with the salmon’s strong attachment to its natal stream reach or tributary. The salmon’s return to the to the same stream to spawn generation after generation imparts a fittedness between salmon and the landscapes they inhabit.105 It is the well-spring of important attributes of genetic and life history diversity. The individual population and its home stream are what management should be trying to protect and nurture. The fine-grained approach to management also recognizes that: Species [and salmon populations] do not exist in a vacuum, and any [valid] definition of biodiversity must include the ecological complexes in which the organisms naturally occur and the ways in which they interact with one another and their surroundings.106 Barry Lopez tells us that diversity of all kinds is important for fundamental reasons: Diversity is a condition necessary for life. Diversity creates the biological tensioning that makes life in general vigorous and sustainable. It’s diversity that ensures perpetuity. The loss of diversity, on the other hand, threatens all life with extinction.10