Summary from our discussion with Mike Bradford

Some key insights from Mike Bradford

  1. Contemporary patterns of salmon production and ecology is shaped by deep time following the end of the last ice age
  2. Although the ‘Canadian’ Yukon comprises only 1/3 of the watershed, these streams produce approximately 1/2 of the fish
  3. Juvenile downstream movements (which Dr. Bradford termed ‘dispersal’) differ among watersheds with relatively large vs. small amounts of habitat
  4. Approximately 40% of Canadian produced salmon move downstream  to non-natal streams
  5. Groundwater and ice dynamics are key in understanding the potential for a stream to be conducive to rearing juvenile Chinook Salmon
  6. Big changes in stock productivity (the numbers of recruits per spawner) has varied through time and most recent years the Canadian stock is more or less just barely replacing itself. Thus, little or no ‘surplus’ for harvest
  7. Although the Yukon River watershed relatively pristine compared to watersheds in the lower 48, substantial habitat modification in the form of placer mining. However, habitat disruption unlikely to sufficiently explain patterns of production
  8. Land in Canada belongs more to Provinces than Federal government  compared to  the US
  9. First nations and distributions of salmon spawning stocks are entwined
  10. Due to reduced harvest downstream in 2015, over 80,000 Chinook Salmon survived to make it back to the Canadian side of the border
  11. Alternative management strategies differ in complexity (single vs. multiple stocks), risk to small unproductive populations, and recognition to lack of recognition of diversity

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