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Last modified
7/14/2009 5:02:36 PM
Creation date
5/22/2009 5:08:36 PM
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UCREFRP
UCREFRP Catalog Number
9592
Author
Mueller, G. A., J. Carpenter and P. C. Marsh.
Title
Cibola High Levee Pond Annual Report 2004.
USFW Year
2004.
USFW - Doc Type
\
Copyright Material
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<br />. <br /> <br />data," random surveys to locate individual signals were made throughout the <br />pond at various times of day and night, nominally in evening just prior to sunset <br />and in morning just after sunrise. A directional hydrophone was used to <br />determine the presence and general direction of a signal, while the omni- <br />directional hydrophone was used to pinpoint the location of sedentary fish (or <br />tags). Finally, during 2004 only, a fixed listening station was established using <br />an anchor and buoy placed near the geographic center of the pond. That station <br />was manned periodically using both types of hydrophones to ascertain general <br />fish or tag location, and an attempt then was made to establish a precise location <br />using a directed-random survey. <br /> <br />Directional Data Analysis. Compass bearing data were sorted and correlated so <br />that only temporally paired, simultaneous observations were retained, and all <br />values were rounded to the nearest 5 degrees. Data were entered into an Excel <br />spreadsheet that showed all corresponding intersections for the two listening <br />stations, and data then were corrected for geographic declination at Cibola HLP <br />relative to true north by subtraction of 13 degrees. <br /> <br />An ArcView "project" was created to accommodate the paired directional data <br />and, the Cibola NW digital orthographic quarter quadrangle (0000) was <br />downloaded from the Arizona Regional Image Archive (ARIS) and added to the <br />project. Next, a lake poly file to represent the Cibola HLP was created from the <br />Cibola NW 0000. Global Positioning System (GPS) coordinates were used to <br />create two point files, one representing the two listening stations and the other <br />representing 26, 5-m wide "zones" that were designated along the high levee <br />(see Point Data Analysis, below). An array of 800 m-Iong radial lines <br />representing each individual bearing observation was created from the stations <br />point file for each listening station, and these were separated into individual <br />shape files based on the listening station from which they were created (i.e., high <br />levee or low [river] levee). The "intersections to points" theme from ESRI then <br />was used to create a single point for each intersection of the radial lines, and <br />these in turn were used to create x-y coordinate fields in an intersection data <br />table. Fish data were added to the ArcView project, and fields showing bearing <br />data for low and high levee stations were inserted. The point intersection <br />shapefile table and the fish data were joined, based upon common <br />station/bearing criteria, and exported as a new table of individual joined data. <br />Finally, a fish shapefile was created from the fish table by converting the fish <br />event theme to a shapefile, and the fish table was summarized based on the low- <br />high levee bearings field. The final result was a graphic that shows which fish <br />were located within each at each two-dimensional space (defined by the <br />intersection of radiating bearings), and the number of occurrences of each fish <br />within each space. <br /> <br />All intersections that fell within the 800 m radius were plotted in ArcView and the <br />remainder was removed from consideration as uninformative. Paired data were <br /> <br />3 <br />
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