Where do we go next? Lyle Britt, Stan Kotwicki, Rick Towler, and Jim Ianelli Alaska Fisheries Science Center, Seattle WA.

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Presentation transcript:

Where do we go next? Lyle Britt, Stan Kotwicki, Rick Towler, and Jim Ianelli Alaska Fisheries Science Center, Seattle WA.

It’s a lot more information!

Biologically Available Light Walleye Pollock in Nearshore Plankton Bloom 46% Reduction in Biologically Available Light!

3 COMPONENTS OF VISUAL ECOLOGY 1. THE VISUAL ENVIRONMENT=BACKGROUND LIGHT CONDITIONS 2. THE SENSOR’S RESPONSE TO THE QUALITY (WAVELENGTH ) & QUANTITY (# OF PHOTONS) OF LIGHT 3. TARGET CHARACTERISTICS WITH RESPECT TO QUALITY ( ) & QUANTITY (# OF PHOTONS) OF LIGHT -Biologically Relevant Targets -Trawl Survey Relevant Targets

VISUAL COLORSPACE MAPPING LINGCOD LARVAE 3.8x Greater Contrast Between Target and Background CLEAR OCEANICNEARSHORE PLANTON BLOOM

Four aspects of light in water influence fish coloration: 1. Differential absorption of wavelengths with depth and distance; 2. Uniform attenuation with depth; 3. Symmetrical distribution of light around the vertical (brightest is overhead); 4. Visibility of objects a function of contrast (not resolution, as in air).

Visually Mediated Behavior