
TABLE OF CONTENTS 
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TNIRODUCTION eseeneveveeeeevenoosee ee eevee secenueseese secs seoeveesesevneesoseeeoetaeansa 1 
DESCRIPTION OF THE AREA .ncecovccsvccceccceoseerccessccceeseeeseerecessees 
LOCAtLON cecccsvecesscccsensescesescseessesessesseceaseeenseetesesens 
Topography and SOLLS cesececcenscccveccseccccnsereveeseessessesvesvos 
Climate ceccccescvecrcccccenccrsevessesecssesessesesseseesesssesveson 
Upland Vegetation wcssccesccccrescccscacencenccccsceesensessceseceses 
Wetland Vegetation saesccoceccvcncsccscceesccssccsceseseesesesessscece 
Animal Species eesececccccscccscseconsersvcsessesescssccossesesesesess 1A 
Land USE sccccccccccescsncccccescccesesesenscesesesceeesecsesessecsees 12 
Classification of Potholes eeenseoeeveeveeeeeveceweseevevvseeeeoeevoeveveeeanaseevooaespesb eens 13 
ON Fo Le od WW 
DUCK POPULATIONS wnccccenccccccnnccnrenenccccebeencsercesseeesesesesess 20 
Sordi Mi granites, ouceteleke: ee ste eidese ue s:siels 88e:d dee Bias Ck eled ade bee a-bieeie sees CO 
Nesting Population cecescecccscccccnenscccesescceesseesesessceceseces Ol 
Br OOS ieror nia: s Segisci arstete-stelete) uneterdnerereuslpse shat: alle ts lave iin *secei ane ce ectvegia.d eitacetetaretale Moe 
Pals} APOPULABAOME - ecs.erciae wAeTed ys apuberk Calas pe Gre cue Om ever aiee wierehele Cee ere Naa ae ase eet aH 
GhroneLogy Of the Season ovine sie giacinleh.s. 06 e's voices SW aie ale deed Sew see octane OO 
POTHOLE UTILIZATION ..cccccvcccnvcccccccccrvvcccesececcessecccesescesees§ 35 
Harly Arrivals ccsccsccvccscvcccncraccccnceeseessecscescesseseseesees 35 
Breeding Pairs sececcercccccvccscesccssasessesccvesesesessesesessseen 35 
Distribution of NesStS ceccccnnsesssccnescceccesecsesesscccccssscesseses 39 
BVOOUSS fou aie. sta tarersveer, ble ace.al'e-Bce, Sraavele wlui6,1026/0Gsve ee -0l6,'6 GVb eNOS Scare: dalla sy os Se eae AO 
Pietersen MUU Sy: aetscercnce ete scatevers. wowace 8 bea wren elect vereretacele Sreck able bois baleen Set ES 
Flying Juveniles and Fall Migrants wesccoceccccsevcccencssecccssscses 43 
MOBILITY OF DUCKS IN THE BREEDING SEASON @e@eeeseseetspsceaoeueeeaneeeseeaeeseeeosesvpeeoeee@ecs aT 
Breeding Pairs @eeeseeepoeve@ eee seeoesetsveoeseeeaw@seneseeoeseseeose es ee#~escosepevo eee seeeveeoeeacueoeeeoeeneanenesd diy 
Broods @#eespogceoevuecesceeeesepeeuevnueceeeecvee eee eveseeeeeveseeeeeceaceeceow eeeaeseveoeeeoeosee see aeons 4S 
USE OF THE HABITAT AND THE LIMITING FACTORS .ececccccsccccccssccccccces HG 
EFFECT OF THE PRESENT DRAINAGE PROGRAM ON DUCK PRODUCTION ...cccecceseoee HY 
Disd nase [Program =< 5.0 sci aie uie rea Cvaswlowsa wie gaa oa's a eee wletelae pateeltel gece: GED 
Brfecs: On. Brood; HADL Ga Gt .«: «vis 00.0% slace eden eee 06 SMe ie alee bea a ere 8 biel ele aie ete” Ol 
EPfeet. con Nesting: COVET “sca eee os Se ere 2 4 0.0 eleva 6 sce ejn oe «ere te pte ele 6.4 sej08, DL 
Effeet on Habitat. for Breeding Pairs wus ss-0 sviescn-« nie ewc.c0 06 0-0 0400 ee e-2 © 51 
CONC LUSTONS » is:0°e n'a 2-07 uie ninidce-sa:07s oie We walele¥e-6 aes Sepy Welp-ela Cale eae ae Oe eee eee? ONS 
Value of the Study Area as Production Habitat. .cccccccccccescccsessee 53 
Relative Values of Pothole Types «0.0 cvcsurc eset sec eenereseseewaceeee. 33 
Effect of the Drainage Program on DuckS ceccecccccccecsccsccseccseccees 93 
APPENDIX==-METHODS @®eeeteoveveeevenevesepesvn eee seevnaeevaeveeseeecvneenvnevneoeeenepeeneseoeee0n8 54 
Census ®eseeaes @eeseeecvpepesegaeesenaneeeeesceseeaeeseeoeueseaueseeovcncseveoeovueueveeeveev ee eeen0e se eeeoes8ed6s6 54 
Other Data eseeevseepeeseseeeseeeeoeveeoeseeoevnseesepeseseeeeoeneveseeoseeveeenaeaeeete e*e¢¢eecsbes4s 56 
AVSIV ST Se-OL CPROCUGE LOL trys apudceh 6b 0 ee cvelhcecete- oie fo wih e<tia-e a tele-: Cale-ooe ane eleeataceale COIL 
LITERATURE CITED eoseeo4u¢Geoeoeevevevesenueeeeseteoseseseeoe ev eee speeeeseseeesoev eevee eeeoeneev eee 58 
