TABLE F-31. --Duck production indexes, Michigan, 1951-61 
Number per lineal mile 
ee oe 













Average brood sise 




Seana aieian 2.20 3.31 5.6 
aa ac md 3.92 3.21 oe eh 
me ma ne en 3.63 4.32 6.10 
Boas ene mien a anene tei 1.67 4.60 SED 
re ele ee a oe lead 4.65 5.09 6.28 
he ha la a aaece me 3.67 4.40 5.86 
a a aa al 2.30 4.80 5.10 
be a ae ae le a ae 2.18 6.50 5.97 
a eda al ll dia 4.00 12.58 5.06 
Onna reat 2.48 14.49 5.50 
aa aa 3.80 771 5.64 


TABLE F-32. --Wood duck production data, Indiana, 1951-61 
[Survey of 9 streams totaling 143 miles] 
Number per 100 miles 
Year ; Average brood size 
1951--.---- oo A as a Ds a 

Tal 
195 Qe ewer nna ane ese ssweneneens= =< Fl 
(1953 -enn ewsewen wenn an= eee 8.8 
1954, nnn enen ene ecen seccecsneseoe 8.3 
195 5----enece= Sone eneseneee en ee 8.6 
1956------2ceenne ne aaceneen= 7.3 
195 Jann nwnennnne- aeenwenesenessn 8.9 
1958 een anna nen ene nnn nnewnnnnne 9.6 
1959----- Seonmneceeanenaassesesen 8.5 
1960-2220 ene n nnn wn enennnenenans 9.6 
Average 1951-60~---------- sasene be 8 8.4 
196-2 - sew nn nn snn nnn n sew eeswnnen, 8.9 
Hercent changes, 1961 from: 
BQ60--<0- omen nnn nee - nnn - ~7 
Ayérage-------------~-~---.~= ea Bs +6 
TABLE F-33. --Wood duck broods observed on streams, Ohio, 1960 and 1961 



JUNG 222 cewe enna a om 
‘ 
JULYorsnena-ecereee—a 
Total---<--- ee a 


121 
