Climate forcing effects on Distribution and Food Web Interactions of Salmon and Other Epipelagic Spe

1
Climate forcing effects on Distribution and Food
Web Interactions of Salmon and Other Epipelagic
Species

• Dave Beauchamp
• School of Aquatic and Fisheries Sciences

2
Climate forcing effects on Distribution and Food
Web Interactions of Salmon

• Inter-annual change in Carrying Capacity
• Relate ocean distribution and movement of
  juvenile salmon to inter-annual and monthly
  physical changes in water masses and associated
  biological community.
• Mechanistic foraging and bioenergetics models
  examine temporal-spatial food supply/demand?Growth
  Survival

3
Spatial-Temporal distribution and
movementpatterns of zooplankton and fish

• Seasonal and Diel patterns of Vertical-Horizontal
  Distribution by salmon, their prey, and
  predators
  
• Quantify depth-specific organism density through
  time with respect to environmental conditions
  within and among water masses. Vertical
  gradients
• Temperature, Salinity
• Light intensity, Turbidity
• Exploitable zooplankton

4
Desired instrumentation for NEPTUNE sensor arrays

• Up-looking split-beam hydroacoustic
  transducers-Diel snapshots of pelagic fish and
  macro-zooplankton density, size structure
  
• Hydrophone arrays for acoustic tags on fish,
  mammals, etc. (e.g., Canadian POST)
  
• Acoustic transmitter-receivers for transponder
  tags on juvenile fish
  
• Vertical profiles Temperature, salinity, light,
  turbidity, chl a
  

5
Foraging success affected by effective overlap of
consumers food
Search Volume Prey density interact to
determine Prey Encounter Rates in Time Space
Planktivores
Piscivores