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<br />SENl' BY: <br /> <br />I-J2-96 <br /> <br />3: 14Pt.1 <br /> <br />UTAH WILDLIFE RES. ~ <br /> <br />303-236-0027;# 4/12 <br /> <br />a 9~QatQr dQ9~~ than native fiah beaau&e of tha lsntic Datur~ of <br />tloodplain Netlands. Hanagement and maintenance of thegQ watland<<. <br />th9~9forQ, will r~ira oonaiderable iDfo~tion .~d in~i~htH ~lth <br />reBpect to their use by both n8~lv8 and nonnati~e B~ciQg~ <br /> <br />The enh&nced productivity ot tloodplatn wetlanOa ~y ~l~ bQ an <br />important ~actcr 1n Qnhanoirtg 8u~viVQ~sh1p of adult native fish. Maddar <br />Tyua and K~, a~ aolden and C~ist have all documented the use of <br />floodp~a~ wQ~lan~8 Qr low velooi~y area. by adult razorback aucker. <br />Wick (po~~l come.) haB Bpoculated that the.. area. may bQ impo~tant <br />post-.~~Lng ra.ti"9 area.. The adult fiah ~y utili.. theBe highly <br />productive are,," to replace valusble enerllY reBerveg that wer" usad for <br />spawning. Reltinq habitat., thuefore, may be ilI1portant to enhMC. the <br />survivorship of the 88nile population of razorback Buckere in the Opper <br />B&sin. <br /> <br />To date, most of the effort on underBtanding the benefits of floodplain <br />function to endacgered BpacioB within the upper baBin haa fooueed on <br />.man1pulatQdM 8itg8 that utillE8 human intQrvGntion to control flooding, <br />Litt1u, if any attgntion, ha~ boon giva~ to naturally flooding ~lanaB <br />in the basin and it appear9 that a aubQtantial amount of area floods <br />naturally. rnis scope-of-work sddS to previous studies by determlning <br />the fish production dynamics or a rangs of natural floodplain wetland' <br />and specific spplication (levee removal) Bite8 a6 they becO~ avAilabla. <br />The application sites wLll be dirAetly ~pared to n~turally occurrin~ <br />floodplain ArQ&a of aLmLlar gip~ wl~hin speciflc ~eacheq. Thiy BCOpe- <br />of~rk outline. a tGmporal and epatial etrategy to deto~ne tbe fiob <br />population reeponse and dynamica of treBto~adl and natural floodplain <br />a~QA". It cOotain8 a monitor~ program design9d to determinG thQ fish <br />food {zooplaa~tcn, ~Qcroinvertp~rate, etc.} and ftsh population reepong~ <br />&s.ociatsd with th.e. wetland.. <br /> <br />We ecviBion that ~nlpulated .i~~ (i.e. Old Charlie, walter/welker, <br />Johneon, Boat ~ttom, etc.) will be ueed to addre.. 10m. specific <br />qu$etlone concerning floodplain ~lllDd function. The.e sites, with <br />thQir centrol atructurG~, offer An opportunity to answer qUQQtlcna that <br />would be far to difficult to addrssR in ~~ wetlande. Id addition, <br />they alao ottar an opportunity to use th~ control otruoturQa to inCr9a9Q <br />the effectivenees of fi.h sampling. h separate scope of work will be <br />Bubrniteed for all eKP8rimentation within manipulated aito(e). <br /> <br />Empha&ie will be placed on the determin~tlon of intvractiong with n&tive <br />and nOnnative speoiee. Reeearch by Crowl and Lantlcb, and that of <br />otbarB, beB provided information euggesting tbat many nonnative B~c1ge <br />now preeent in tne colo~ado River Syetem are potentially very important <br />a9 limiting fBctors to native fish eurvivorship and r6cruitment. <br />Channel catiish, nortbern pike, green sunfieh end Bmallmouth ba6B all <br />pose Digalficant threat" i.n term. of their con.aWDl'tiv8 .,ffeqt., on native <br />specloa ~urvivor8hip. Green Bunflsb, 8mAllmouth bass and northern pike <br />are known to Lohabit littoral habit_tg in Kid~stBrn t~kee and <br />reservoirs. Tbus, it we &rQ to devQlop and ~age flooded bot~omlands <br />to b9neflt native fish epecies, we must Ascertain whQtb8r thQ~g habitats <br />will also bBnetLt nonnativea. P1rst, we must dQtBrmine whether <br />i~rtant nonnative pradator epecleo utlli1v theee hobieats and whether <br />the increased 6patial complexity (and enhanced YOY .urvivorehlp) <br />