TABLE F-23.--Distribution of duck broods by age class, 
North Dakota, mid-July, 1955-1963 
Percent of total 
1955-1962 average 





Age class i 
Class I: 
1 Based on "A Guide for Aging Duck Broods in the Field", by Gollop and 
Marshall, May, 1954. 
TABLE F-24.--Species composition of the duck broods observed 
during the mid-July surveys in North Dakota, 1955 through 1963. 
Percent of total 
1955-1962 average 


Species 




Dabblers: 
Malleard--+--+---------~-~---.------ 15.0 
Gadwall------------~-------.-.---- 12.4 
American widgeon---------------- 2.0 
Green-winged teal----------.«---- 0.7 
Blue-winged teal---------------. 30.7 
Shove ler-------+------------.-..-- 10.5 
Pintail---------+-----.~.-+.-.~-.- 12.4 
Divers: 
Redhead ------+--------+--..--..-- 5.2 
Canvasback---------+-~--..-----.- U1 
Benes ses eee eae ee ee ee ee ee ee 





Number of Transects----------~----- 
Square miles sampled-------------- Wyk 
Square miles in stratum----------- 16,232 
Number of broods seen------------- 1 
Brood index/sq. Ih] . e- ese ene ene 
150 
