SS3.10 Ecological Implications of Terrestrial Inputs into Lakes and Ponds
Date: Tuesday, June 11, 2002
Time: 2:45:00 PM
Location: Esquimalt
 
Clauser, A, , Lehigh University, Bethlehem, USA, aac2@lehigh.edu
WilliamsonCE, Lehigh University, Bethlehem, USA, cew0@lehigh.edu
 
CANOPY COVER AND EPHEMERAL POOL ECOSYSTEMS: OPTICAL LINKAGES AND EXPOSURE TO UV RADIATION
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Deciduous forest canopies play two divergent roles in determining the UV exposure of organisms in forested ephemeral pools. Thirty-nine pools were sampled from ice-out to desiccation. While attenuation in the water column was the principle regulator of UV radiation before leaf-out, direct shading of incident UV by deciduous canopy cover played the largest role after leaf-out. Depth refugia from UV varied strongly among pools as well as seasonally within pools, with UV 1% attenuation depths exceeding maximum pool depth in some cases. Dissolved organic carbon (DOC) and particulates were the primary attenuators of UV. Pool inhabitants differed greatly in their UVR tolerance with invertebrates typically being more sensitive than vertebrates.