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100 <br />5D <br />C <br />100 <br />50 <br />C <br />100 <br />5C <br />C <br />~ 100 <br />R <br />U <br />0 <br />rn 5C <br />c <br />m <br />"' C <br />a 10C <br />5C <br />10C <br />5C <br />L <br />10C <br />50 <br />0 <br />BIOLOGY OF HUMPBACK CHUBS IN THE GRAND CANYON <br />C1 <br />17:57 <br />C2 <br />11:27 <br />C3 <br />59:69 <br />C 4 (Confluence) <br />474:237 <br />C5 <br />141:82 <br />C6 <br />58:60 <br />C7 <br />581:70 <br />~uu <br />50 <br />C <br />5( <br />C <br />5( <br />C <br />5( <br />0 <br />HBC SKD BHS FTM FMS SAL RGK <br />_ Minnow Trap and Seine <br />L~ Trammel Net <br />HBC - Humpback Chub <br />SKD - Speckled Dace <br />BHS - Bluehead Sucker <br />FTM - Fathead Minnow <br />FMS - Flannelmouth Sucker <br />SAL - Salmonids <br />RGK - Rio Grande Killifish <br />59:69 - First number • total fish caught by <br />minnow trap and seine. <br />Second number -total fish caught by <br />trammel net. <br />Study Area <br />LC 1 <br />1333:0 <br />LC 2 <br />2442:16T <br />LC 3 <br />1219:28T <br />LC 4 <br />1363:67 <br />591 <br />C1 <br />C2 y <br />Little Colorado River <br />C3 LC3 <br />~ C4 <br />LC 4 ~ LC 2 <br />° C 5 LC 1 <br />0 <br />U <br />C6 <br />C7 <br />HBC SKD BHS FTM FMS SAL RGK <br />v FtcUxe 11.-Relative abundance (pe_rcenz) of the dominant species caught by minnow trap and seine, and by trammel <br />net from Little Colorado River, confluence, and Colorado River reaches, 1980-1981. <br />0.01) from those in LC 2 and LC 3. This dif- River sample and individual Little Colorado <br />ference was due to the high frequency of the River reaches or the confluence; however, the <br />10/ 10 combination in LC 4 and the confluence. total Colorado River sample was small. <br />No differences were observed among Colorado Ecotypic variation can occur among popula- <br />River reaches, or between the total Colorado lions in response to differences in their respec- <br />