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<br />a Lab-Line water sampler containing a 300-milliliter BOD (Biological Oxygen ' <br />Demand) bottle to the desired depth and then triggering filling. Samples were <br />fixed immediately in the field using the Winkler Method (fresh reagents <br />supplied by Hach Ciemical). Fixed samples were titrated indoors upon ' <br />returning from the field within 1-6 hr of collection. <br />Weather data ' <br />Average daily mininam and maximum air temperatures at Maybell, Colorado, <br />were obtained fraann the Colorado Climate Center, Department of Atmospheric <br /> <br />Science, Colorado State University. Data were collected by the National ' <br />Weather Service Cooperative Weather Station in Maybell, Colorado. Minimum and <br />maximum temperatures during the 2 study years were compared to mean mininmm <br />and maximum. temperatures for the 27-year period 1958-1985. The USGS in ' <br />Meeker, Colorado, provided mean monthly flow data for the Yampa River from <br />1917-1988. <br />Data anal <br />sis ' <br />y <br />Data were transferred from field data sheets to database files using <br />fields identified in Appendix B. Additional data fields were added to the ' <br />database to aid in data stratification, calculations, and compatibility with <br />other databases. Negative velocities were converted to positive values in <br />calculation of descriptive statistics. ' <br />For compatibility between years, Winter 1 observations qualified for <br />analysis only if they were short term (2.5 hr) or the first 2.5 hr of a 24-hr <br />continuous observation period. only sample types defined as AT, AN, AW, and <br /> <br />BB (Appendix B) were included. ' <br />The long term (24 hr) data partition was used to examine behavioral <br />differences between morning, afternoon, evening, and night partitions. The <br />analysis was conducted to investigate temporal differences in depth, velocity, ' <br />substrate, and habitat use. Results of this analysis are discussed in Wick <br />and Hawkins (1987). <br /> <br /> <br /> <br /> <br /> <br /> <br />14 1 <br />