DFO Lakes Research Program SLIPP WQ PAC Workshop 12-April-2012

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presented by Dan Selbie, Ph.D

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DFO Lakes Research Program SLIPP WQ PAC Workshop 12-April-2012

  1. 1. DFO’s Lakes Research Program•  Historical Limnological & Fisheries Research and Monitoring §  1987-1993 – Shuswap and Mara Lakes (Nidle & Shortreed 1996, Morton and Shortreed 1996) §  2007-2008 – Mabel Lake §  2008 – Little Shuswap Lake §  2011 – Shuswap and Mara Lakes
  2. 2. Shuswap Lakes DFO Deep Stations 2011L. Shuswap Lake Seymour Arm Main Arm Shuswap Lake Anstey Arm Salmon Arm Mara Lake
  3. 3. Shuswap LakeWhole Lake Seasonal Mean Photosynthetic Rate 300 Whole Lake 250 Photosynthetic Rate (mg C/m /d) 2 200 150 100 50 0 1988 1989 1991 2011 Fisheries and Oceans Canada, Science Branch, D.T. Selbie unpublished data
  4. 4. Shuswap LakeArm-Specific Seasonal Mean Photosynthetic Rates 300 300 Main Arm Seymour Arm 250 10,583 salmon/km2 250 4,494 salmon/km 2 Photosynthetic Rate (mg C/m /d) Photosynthetic Rate (mg C/m /d) 2 2 200 200 150 150 100 100 50 50 0 0 300 300 Anstey Arm Salmon 10,649 salmon/km2 250 2,437 salmon/km 2 250 Arm Photosynthetic Rate (mg C/m /d) Photosynthetic Rate (mg C/m /d) 2 2 200 200 150 150 100 100 50 50 0 0 1988 1989 1991 2011 1988 1989 1991 2011 Fisheries and Oceans Canada, Science Branch, D.T. Selbie unpublished data
  5. 5. Mara LakeWhole Lake Seasonal Mean Photosynthetic Rates 300 Mara Lake 1,689 salmon/km2 250 Photosynthetic Rate (mg C/m /d) 2 200 150 100 50 0 1987 2011 Fisheries and Oceans Canada, Science Branch, D.T. Selbie unpublished data
  6. 6. 300 Salmon Arm 250 Shuswap Lake 200 Arm-Specific Seasonal Mean Size- 150 Fractionated Photosynthetic Rates 100 50 Seasonal Mean Photosynthetic Rate (mgC/m2/yr) 0 300 Seymour Arm 250 200 150 100 50 0 300 Main Arm 250 200 150 Microplankton PR (>20µm) 100 Nanoplankton PR (>2 µm <20µm) Picoplankton PR (>2 µm <20µm) 50 0 1987 1988 1989 1991 2011Fisheries and Oceans Canada, Science Branch, D.T. Selbie unpublished data Year
  7. 7. Fraser Basin Sockeye Nursery LakesComparison of Seasonal Mean Photosynthetic Rates 450 400 Seasonal Mean Photosynthetic Rate 350 300 (mgC/m2/d) 250 200 150 100 50 0 Chilko Takla Trembleur Mabel Quesnel Harrison Fraser Cultus Kamloops Francois Seton Lillooet Stuart Chilliwack Anderson Shuswap Bowron Lake Fisheries and Oceans Canada, Science Branch, Modified from J.H. Hume et al in prep
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