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<br />
<br />5-7. Graph showing percent of channel and flathead catfishes of legal length
<br />captured by 2,5-centimeter-mesh hoopnets (channel catfishes) and
<br />electrofishing (flathead catfishes) from the Missouri River. Missouri.
<br />August-November 1990 ,...",.............",........,..........,...,.."......,..........,',..........,.., 62
<br />5-8, Graph showing rank of the top 25 fishers and their reported total catch of all
<br />catfish species from the Missouri River. Missouri. 1990............,....................... 63
<br />5-9. Graph showing percent of annual discharge for the Missouri River at
<br />Boonville. Missouri. by month for the preregulation years 1929-1948............. 64
<br />
<br />&-1. Computer-generated curves showing changes in total fish biomass with time
<br />for different flood regimes ..,..,..,..,......................,.......................,....,.................. 75
<br />6-2. Missouri River hydrograph in 1880-1899. 1929-1948. and 1966-1985,.......... 76
<br />6-3, Graph showing annual peak discharge at Omaha. Nebraska. from 1929
<br />through 1986 ..............,......,.........."..,........,................,....,............"....,..............., 76
<br />6-4, Graph showing estimated changes in the percent of floodplain habitats.
<br />Sioux City to SI. Louis between 1880 and the present .......,....,..,............,........., 78
<br />6-5. Graph showing sauger captured by gillnet from the upper unchannelized
<br />reach of the Missouri River in Nebraska .......................,..,....,....,....,..........'....... 84
<br />6-6, Graph showing sauger harvested by sportfishermen from the tailwater of
<br />Gavins Point Dam. 1956-1992 ..............,..,....,..,..........,...........,..............,........... 85
<br />6-7. Graph showing number of fishes per seine haul for three species of chubs
<br />from the same locations along the channelized Missouri River in Nebraska
<br />in the 1970's and 1990.s,....,............,......,..,...............,........,......................,......... 86
<br />6-8. Graph showing percent composition of plains minnows in seine hauls made
<br />in the 1940's. 1970's. and 1990's in the Missouri River in Nebraska..,....,........, 86
<br />
<br />7-1, Map showing locations of observed occurrences of rare or endangered
<br />species in or near the upper Mississippi. lower Missouri, and Illinois Rivers
<br />and their tributaries ...,........,........,...,........,..........".......,..,...............,.............,..... 92
<br />7-2. Map showing distribution of the interior least tern....,........,..,..........,............,.... 94
<br />7-3, Map showing distribution of piping plovers reported from the 1991
<br />international census......... ............... ......... ..... ........ ,_ ....... ........... .... .................. ..... 95
<br />7-4, Map showing location of high-density region for bald eagle night roosts and
<br />winter concentration areas, middle Mississippi River ........................................ 97
<br />7-5, Map showing location of the Central Flyway..,......,............,......................,....... 99
<br />7-<5. Map showing location of the Mississippi Flyway...................,..........,..,............ 99
<br />7-7, Graph showing mean numbers of duck-use days. 1988-1922. and numbers
<br />of duck-use days. 1993. on selected Missouri wetland areas........,...,................. 100
<br />
<br />vii
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