The data obtained has value as a-comparative index to denots changes in 
productivity and survival of young. 
Aerial transects over 200 square miles of southern Michigan nesting habitat 
during the past two years showed a 143 pereent increase in potential nesting 
population. 
Surface.transscts of sample areas have been sstablished throughout the State 
to obtain better coverage. Those sample area (best marshss) have shown an 
averages of 6.8 potentially local nesting ducks per linsar mils of census lins 
or 56 ducks per square mile. The composition of species, in order of abundancs, 
were black ducks, mallards, blus-winged teal and wood ducks. 
Weather and water conditions were favorable for production. 
Brood censuses on ths sams sample arsas previously censused for potential 
nesting ducks showed an increase of 2.75 additional young per linear mile. The 
broods were: computed at 5.1 per square mile, and the number of young averaged 
5.8 per brood, indicating good survival. 
“Thess surveys strongly indicats that Michigan expsrisnced a successful year 
of waterfowl production in 1919. 
197 
