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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 123. No. 4. December 2011 
Head*** 
Beak 
Tarsus 
Middle Toe 
Wing Body* 
FIG. I. Morphometric characteristics of Westland 
lines are means, gray boxes are SE, whiskers are SD. 
Petrels: females (F). n = 7: males (M). n = 30. Horizontal black 
* P < 0.05, *** P < 0.001, **** P < 0.0001. 
females and males differed (MANOVA; F 729 = 
5.6, P < 0.001) in morphometric features. 
The standard discriminant function model was 
strongly significant (Wilks' Lambda = 0.43, F 729 
- 5.6. P < 0.001). Its canonical discriminant 
function (Fig. 2) was defined primarily by 
variation in minimum bill depth and head length 
(factor loadings: MBD = 0.73, HL = 0 67 BM = 
0.30, BL = 0.28. MTL = 0.26 WL = () 22 TL = 
0.18); MBD and HL were the only significant 
characters (MBD: F iM = 17.6, P < 0.01: HL: 
F i ,34 = 12.0, P < 0.01). The stepwise DFAs 
yielded similar results (forward: Wilks' Lambda 
- 0.43. F 2,34 = 22.5. P < 0.001: backward: 
Wilks' Lambda = 0.43. F 2M = 22.5. P < 0.001) 
with MBD and HL (both with P < 0.0011 
remaining as most significant, suggesting robust 
discrimination. The DFA correctly classified all 
New“ lid ™ T T* ™ DNA of 37 adult Westland Peuels. Papama National ParL 
dimoS T ’ r ,Cn,al '' ,F ' of significance, and the peteen, sexual 
dimorphism ,s shown for each measurement. All means am in mm except wine lennth ten,, „„rt hmlv mans (e). 
Morphometric character 
P (» - 7) 
M (<i = 30) 
... 
Partial n ; 
p 
Dimorphism 
Head length (HL) 
Minimum bill depth (MBD) 
Bill length (BL) 
Tarsus length (TL) 
Middle toe length (MTL) 
Wing length (WL) 
Body mass (BM) 
67.3 ± 0.4 
16.2 ± 0.1 
49.3 ± 0.5 
64.8 ± 0.6 
76.3 ± 0.8 
63.6 ± 0.3 
1.186 ± 21 
70.5 ± 0.3 
18.2 ± 0.2 
50.8 ± 0.4 
65.9 ± 0.4 
78.0 ± 0.4 
64.5 ± 0.3 
1.260 ± 17 
4.31 
5.01 
1.94 
1.21 
1.80 
1.53 
2.05 
0.35 
0.42 
0.06 
0.04 
0.08 
0.06 
0.11 
<0.001 
<0.0001 
0.06 
0.23 
0.08 
0.14 
0.048 
4.5 
10.9 
3.1 
1.6 
2.2 
1.3 
5.9 
