MISSISSIPPI FLYWAY 
iy > em 43 oe ott a 3 ’ 5 Se, . saat 
* Abnormal ‘sucéess-in-1952 was dete _ fochditig of other 's9 | 
nesting cavities and subsequent large scale dump 
nesting in these nesting boxes- raised up above flood: 
crest; ged success does not indicate Br pamatiol eae 
f 4 4 : ' , PPh Ae igs 
[- Ae | tow ,er¢ J. ee 
‘“#* Student observer not available on full- time. basis: and consequently 
‘data not available. MOM fie gy Tats Bea to Ree Pe 
at? 

On-the - -spot check counts’ in the prairie “marshes of northwest Iowa each 
spring and summer since 1949, plus aerial coverage of the same marsh units 
since 1952, ‘have provided a studied! ‘opinion as to the production trends of blue- 
winged teal and mallards. Blue- -winged teal constitute the most numerous 
nesting speciés in the remaining prairie marshes, and the mallard is not far 
behind. Production of these two species in 1955 eedecdce production during 
1952, 1953, or 1954. 
te be 
| The productive potential of the wood duck in Iowa is not well understood, 
not i's the’ size of the standing’ crop?'. The nesting density of this species and its 
range throughout the State has increased during the last ten yeais;' butiitits: : -: 
Brokael> that 1949 or 1950 may have been peak years for muoee duck EOE sen 
and ‘that the trénd since then has Heedtowhward.: fr erty ad tees 
GAIUS he tay Hits gt eme Se ids 
Conclusions - . 
2 rs ar i 2 4 4 Boe : i ‘ Lay x 
It is éstimated that the tp ae this year hows Iowa will be about the 
same as last Year.‘l > Seeostk sunled 
Oy ek. j £ 4 aie af 5 Mo ; 
ett get FP 2 Hood) beac. gral 
MICHIGAN!" 45 } + IRR T ht 
Fie 2 7 eae oe fostaiGd 
Weather and Water’ Conditions - Woitius fiat 

Weather conditions and water levels generally have been conducive’ts 
ood peCEttebiany 
Det as wah ita paseo beet? ef Aay au fe ide ao ae a TUR ye the 
bevisedo > iygiya’ einbevawned averaging 76 degrees abdve ‘nérmal: centile 
‘through April.” “THe U. S? Weather ‘Bureau reports “the ‘warmest Dentin teeuad. 
Precipitation’ averaged'S percent’ less than tioPmal. | “ay uapeNarrd 2b po. sar 
Although several periods of below-normal temperatures occurred in 
May and June, abnormal weather that would seriously interfere with nesting or 
brood survival did not occur. 
13 
