ge 
Table 23 - COMPARATIVE VULNERABILITY OF SPECIES 
1953 through 1960 Seasons 
(All species compared to MALLARDS, which have been assigned a rating of "1.00") 
~~ SUPPER MISS ee LOUIGA ee LPT BRD RRM 
; UPPER MISS oe LOUISA :: KEITHSBURG se GARDNER fis BATCHTOWN os CALHOUN mea) 
N 
: REFUGE His Unit ag Unit Unit rtrd Unit a. Unit 2° oehy 
: First :Entire :: First :Entire :: First : Entire:: First :Entire :: First :Entire :: First :Entire ::E n 
Species : Week :Season :: Week :Season :: Week : Season:: Week :Season :: Week ‘Season :: Week ‘Season Se 







Mallard : 1.00: 1.00 :: 1.00: 1.00 :: 1.00: 1.00:: 1.00: 1.00:: 1.00: 1.00:: 1.00: e 
Black : be: 1.07 ::  .28: .77 :: + : 2.602: 2.22: .3h:: 28 : B87 :: .76: she fe fey 
Gadwall : .865 : 1.01 :: .70: 4.64 rs: - - 2.82 : 4.75 :: ea leer 80 :: 3.02: 4.80:: 2.38 
Baldpate : Al: 523: 2.92: 5.10 :: - : 17.08 :: 6.78 : 10.48 :: 19: 250 :: -73 : 1.67 ¢: 95 
Pintail “ 2: lbs: 2.48: 1.73 :: - +: 2.25 +: 1.40: 1.52: 36 60: 95 : 2.73 2: 1.52 ;: 
G.w. teal : 1.98 : 3.57 :: 4.72: 5.57 3: ~ 2 8.7L :: 5.20: 8.30 :: 2.28: 3.11 :: 4.oh : 9.173: 6.05 : 
B.w. teal 2: 1.78: 2.01 :: 14.52 : 15.70 :: - : 3.46: - ¢: 3.39 :: 2.66: .64 :: 6.13: 2.20:: 2,80 : 
Shoveller : 688: 2.99 :: - : 8.27 :: - 3: he.7o:: - +: -~ ¢: 1.22: 1Ole: 1.87 : 8.83 :: Sci 3 
Wood duck > 6<1: 1.68 3: 1.75: Tee cs - 2: 1.702: 12s hott 6.3L 2) 637s: 245: 3.382: 3.09; 
Redhead >: 1.69: .85:: - :20.68:: - : - : - $$ - :: 1.61: 1.50 :: .46: 2.0h :: 1.55 3: 
Ringneck >: 1.66: oly ss 251 3 2.30 33 - 3 - 33 51: 1.04 :: 1.25 : 1.37 :: 1.05 : 1.03 :: “19 3 
Canvasback 2 6322 BA ts Ue ct BOK ts = tl tt = tl 1G tt Gs Tht 26 SK: 56 3; 
Scaup : 2388: 21s: Ah: 6.30 s: |= 3: = 8:3 66: 3.13 :: 69: .65 :: .96: 2.1332: 58 3: 
Goldeneye So mt a ees ee Oe Fe Se Oe eee ee LB oe ee Sle se 16: 2.05 :: 34s 
Bufflehead : 1.92: 85 3: - $$ = of - $$ = 2 - 3:17.00 :: - : 5.61 :: - : 8.33 2: 2.33 6: 
Ruddy : bh: 82:8: - $: - 8: = ¢ -=- st -=- $: = ht 6162: 1.05 :: Ol: .87 2: 1.00 3: 
Mergansers ¢ dh:  .13 2: > 1.72 :: : 7: 6.67: eh ss 2: O39 ts - +: 50.00 :: 20 3 





Note: These data were obtained as follows: the percentage of the checked kill was divided by the percentage of the population 
to obtain an index. Since the percentage of mallards in the checked kill and in the population was nearly equal, the 
index for that species was corrected to a rating of "1.00," and the index for all other species were similarly corrected. 
The rating thus obtained compares the apparent vulnerability of other species to mallards. Thus, if in the last column 
green-winged teal have a rating of 6.05, they have an apparent vulnerability in this particular area that is 6.05 times 
as great as mallards; baldpates are only 0.95 times as vulnerable, etc. 
Data for wood ducks, redheads and canvasbacks are complicated by whole or partial protection on these species during 
some years of the study. 
