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Table II. Interior Least Tern - 113 -1 Data Needs and Monitoring Reference Cosies <br />USFWS, r3 ltabmrefO413.wpd Page 13 of 24 April 13, 2001 <br />Monitoring <br />Potential Sources <br />Possible Analysis <br />Reference Code <br />of Current and <br />Methods' <br />Time Frame <br />Data Needs <br />a USGS gaging <br />Discharge <br />✓ <br />stations <br />• Permanent <br />transects <br />b ) Vegetation Encroachment <br />Data Needs vegetation: <br />r <br />Transects at <br />Sediment/vegetation <br />Pre- and post- land <br />management <br />Plant class composition (grass, <br />Research <br />selected areas <br />model <br />activity; post- land <br />y' p <br />fortis wood y) <br />Height <br />affected by land <br />Trend analyses <br />management <br />Density <br />management <br />repeated annually <br />activities <br />• Permanent <br />transects <br />Aerial photographs <br />Data Needs: <br />Discharge <br />0 Records from <br />Monitoring on an <br />Quantity, distribution of bare <br />✓ <br />USGS gaging <br />Videography <br />ongoing basis <br />sandbars <br />LT /PP -08 -W <br />stations <br />0 Records of timing <br />Sediment/vegetation <br />model <br />Occurrence of thick, erosive <br />and magnitude of <br />ice on river <br />Research <br />EA releases <br />USFWS, r3 ltabmrefO413.wpd Page 13 of 24 April 13, 2001 <br />