Gre cies Composition of the Breeding Pomilation 
The especies composition of the breeding population is shown in Table 2, 

Species _ Fopulation Percent 
Biacke 1,138 46 
Wood duck B61 rar 
Hingeneck 254 11 
Bw, t#al 263 11 
Gy, teal 164 6 
Mallard ot 1 
Golden-eye 32 1 
Unidentifie a 
To tal 2,480 igo 
This table ehows that black ducke have increased ten percent over last 
year in importance on the Sree and now make up 46 percent of the breeding 
Population. Wood ducks decregsed 6 percent, and green-winged teal increseed 
from 2 percent to 6 percent thie year. Golden-eye decreaged from 7 percent 
to L percent, and mallarda appeared in the tally for the filreat time following 
Teast summer's planting in the Area. Blue-wings increseed slightly in importance 
and rose to ll percent of the total, but ring-necks dropped off from 15 percent 
to 1] percent. 
Fopulation Trends from 1945 
It is possible to measure the population trends on the Study Area since 
194%, the firet year of the study, br using the breeding population of that 
Year as a base datum and measuring the Increase or decrease of the species in 
the succeeding yearg. These trenda are shown in Table 2, 
Table 2. - Population Trends from 1948 
Percent 
Srecies 1946001947 194% 1949 
Elacke =49 ~ 9 -24 #34 
Woo? duck -80 -63 f1é #82 
B-w. teal -28 ~87 -70 =Z} 
Ring-neck $3 49 16 86#121 
G-w. tes -14 -78 -74 433 
Golden-eye -63 #2189 #85 = +41 
Unidentified -27 “ 9 9 
AY & _ -~42 7” a 
Biack ducks show #2 spectacular incremnse this year, and for the firrt 
time in five years they gre above the 1947 level. Wood ducks also are abrve 
94 
