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1 10. Floodplain and adjacent ponds within the ISA of the Colorado River between river miles ' 185 to 152 showing the locations of ponds receiving nonnative fish control treatments (Martinez 2004). ' 11. The index of threat gives a relative impression of which nonnative species are prevalent throughout the primary study area, but are also present in many ponds that lack nonnative ' control measures. The darker bars indicate the threat prior to control measures. In this case, threat equals prevalence. The lighter bars indicate that the index of threat is lowered after control measures have been implemented. ' 12. (a) A plot of all known stocking events (336) from 1998-2001 with adequate spatial information to be mapped compared to the same map with an additiona1243 stocking t events randomly distributed to illustrate magnitude of information'., lacking adequate spatial information to be meaningfully mapped (b). The actual distribution of the non- spatial records likely resembles that of the spatially placed records. 13. Visual depiction of private stocking densities for (a) triploid grass carp, (b) channel catfish, (c) bluegill, (d) black crappie, (e) largemouth bass, (f) fathead minnow. Maps ' may show repeated locations due to a single water being licensed for more than one species. ' 14. Private lake licenses issued for the years 1997-2001. Maps may show repeated locations due to a single water being licensed for more than one species. a) triploid grass carp; b) bass species; c) western mosquitofish; d) bluegill; e) fathead minnow; and f) channel , catfish. 15. Commercial lake licenses issued for the years 1997-2001. ' 16. Stocking densities of largemouth bass vs. largemouth bass backwater density. , 17. densi i f fathead minnow vs. fathead minnow backwater densi Stocking t es o ty 18. Clusters of high largemouth bass densities appear near several ponds that will eventually ' be treated to remove/control nonnative fish within the ISA of the Colorado River. 19. Clusters of high largemouth densities remain near several ponds that have been treated to , remove/control nonnative fish within the ISA of the Colorado River. 20. .Clusters of high green sunfish densities appear both near and far away from several ponds ' that will be treated to remove/control nonnative fish within the ISA of the Colorado River. ' 21. Clusters of high green sunfish densities remain both near and far away from several ponds that have been treated to remove/control nonnative fish within the ISA of the Colorado River. ' vii '