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Table II. Interior Least Tern - R3 -1 Data Needs and Monitoring Reference Codes <br />USFWS, r3 1 tabmref04l3.wpd Page 11 of 24 <br />April 13, 2001 <br />Monitoring <br />Potential Sources <br />Possible Analysis <br />Reference Code <br />of Current and <br />Methods' <br />Time Frame <br />A. Program Effects on Least Tern Habitat <br />1) Program effects on quantity, quality, and <br />spacial distribution of least tern riverine <br />nesting habitat <br />a) Wide active channels <br />Data Needs: <br />Width of active channel <br />LT /PP -01 -W <br />0 Aerial /satellite <br />9 Trend analyses <br />0 <br />At 3 -year intervals <br />Wetted width <br />LT /PP -01 -W <br />photographs <br />o Videography <br />Quantitative <br />before /after <br />• GIS database <br />comparisons by <br />• Permanent <br />bridge segment <br />transectsZ <br />b) Suitable sandbars for nesting <br />Data Needs: <br />Amount of unobstructive bare <br />LT /PP -04 -W <br />0 Aerial /satellite <br />0 Trend analyses <br />0 <br />Videography, at <br />substrate at various <br />photographs <br />Quantification by <br />least 3x annually; <br />discharges (especially at <br />0 Videography <br />bridge segment <br />10 years <br />nest initiation) <br />o Permanent <br />0 Sediment/vegetation <br />Permanent <br />transects <br />model <br />transects, annually, <br />• USGS gaging <br />10 -13 years <br />stations <br />USFWS, r3 1 tabmref04l3.wpd Page 11 of 24 <br />April 13, 2001 <br />