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Table II. Evaluation of Program Effects on Interior Least Tern <br />15 <br />Potential Sources of Current <br />Possible Analysis <br />and Future Data <br />Methods' <br />Time Frame <br />A. Program Effects on Least Tern Habitat <br />1) -Program effects on quantity, quality, and spacial <br />distribution of least tern riverine nesting habitat <br />a) Wide active channels <br />Data Needs: <br />Aerial/satellite photographs <br />0 Trend analyses <br />At 3 -year intervals <br />Width of active channel <br />0 Videography <br />a Quantitative before /after <br />Wetted width <br />0 GIS database <br />comparisons by bridge <br />• Permanent transects' <br />segment <br />b) Suitable sandbars for nesting <br />Data Needs: <br />0 Aerial/satellite photographs <br />0 Trend analyses <br />Videography, at least <br />Amount of unobstructive bare <br />0 Videography ' <br />Quantification by bridge <br />3x annually; 10 years <br />substrate at various discharges <br />Permanent transects <br />segment <br />0 Permanent transects, <br />(especially at nest initiation) <br />USGS gaging stations <br />0 Sediment/vegetation model <br />annually, 10 -13 years <br />c) Food availability <br />Data Needs: <br />0 Sampling within one mile of nesting <br />Trend analyses <br />0 Ongoing <br />Discharge <br />terns <br />Water temperature <br />Climate data (for water temp. modeling) <br />Fish community structure, species <br />0 Twice during nesting <br />composition <br />season; 10 -13 years <br />2) Program effects on the sustainability of riverine <br />nesting habitat <br />a) Channel morphology/ sediment availability <br />Data Needs <br />WC roost transects <br />0 Sediment/vegetation model <br />Annually, 10 -13 yrs <br />Water Depth <br />USGS/USBR sediment transects <br />0 Trend analyses <br />Incidentally, post - <br />Active channel width <br />Permanent transects <br />flood measurements <br />Wetted width <br />o Aerial/satellite photographs <br />Extent of unobstructive bare <br />Videography <br />substrate <br />15 <br />