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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 124. No. 3. September 2012 
TABLE 2. Median activity, median concentration, and mean vector (ot and r lor angle and vector length, respective!)) 
for Australian Silvereyes prior to and during exposure to magnetic fields simulating North (SimN) and South iSimS) 
locations. For birds w hose distribution of nightly bearings were axially-oriented, v and r values are indicated in italics and 
the i value is given as the strongest end of the bimodal axis, as defined by which end of the axis was nearest to the greater 
number of nightly bearings. Birds that were active on only one or two nights (indicated by NA rather than sample si/e. 
n) during displacement tests were omitted from further analyses. 
Control: 
before displacement 
Sim Field: 
during displacement 
Bird 
n 
Median activity Median concentration 
aC't 
r 
n 
Median activity 
Median concentration a( t 
r 
SimN adults 
A1 
5 
129 
0.28 
37 
0.77 
6 
140 
0.18 
337 
0.55 
A2 
5 
200 
0.26 
II 
0.51 
6 
113 
0.16 
287 
0.15 
A3 
5 
222 
0.19 
45 
0.93 
6 
109 
0.41 
129 
0.59 
A4 
5 
821 
0.41 
289 
0.63 
6 
462 
0.56 
278 
0.52 
A5 
5 
499 
0.18 
348 
0.61 
6 
456 
0.24 
92 
0.61 
A6 
5 
262 
0.20 
10 
0.50 
6 
295 
0.13 
94 
0.18 
A7 
5 
641 
0.24 
40 
0.53 
6 
702 
0.38 
319 
0.31 
A8 
5 
288 
0.14 
80 
0.93 
6 
298 
0.17 
301 
0.58 
A9 
5 
483 
0.11 
17 
0.88 
5 
323 
0.14 
325 
0.62 
A10 
5 
175 
0.24 
21 
0.82 
NA 
SimN juveniles 
Jl 
5 
111 
0.28 
43 
0.49 
6 
201 
0.20 
10 
0.83 
J2 
5 
88 
0.28 
103 
0.40 
3 
69 
0.33 
51 
0.77 
J3 
5 
909 
0.19 
9 
0.62 
6 
372 
0.10 
37 
0.59 
J4 
5 
1,151 
0.26 
60 
0.27 
4 
64 
0.40 
349 
0.55 
J5 
5 
514 
0.23 
14 
0.30 
4 
41 
0.30 
312 
0.62 
J6 
5 
396 
0.17 
47 
0.86 
6 
57 
0.33 
356 
0.96 
J7 
5 
510 
0.11 
25 
0.49 
6 
176 
0.25 
335 
0.55 
J8 
5 
202 
0.28 
356 
0.54 
6 
126 
0.30 
311 
0.48 
SimS adults 
All 
5 
254 
0.34 
331 
0.71 
5 
322 
0.33 
21 
0.56 
A12 
5 
284 
0.20 
29 
0.43 
5 
168 
0.25 
15 
0.67 
A13 
5 
564 
0.19 
83 
0.88 
5 
380 
0.30 
139 
0.58 
A14 
5 
608 
0.27 
8 
0.57 
5 
206 
0.39 
0 
0.51 
A15 
5 
179 
0.25 
29 
0.52 
5 
116 
0.24 
354 
0.96 
A16 
5 
901 
0.14 
318 
0.77 
5 
252 
0.31 
10 
0.64 
A17 
5 
206 
0.32 
36 
0.54 
5 
316 
0.28 
110 
0.31 
A18 
5 
225 
0.34 
38 
0.24 
5 
92 
0.37 
343 
0.68 
A19 
5 
275 
0.39 
5 
0.78 
5 
208 
0.46 
301 
0.56 
A20 
5 
586 
0.49 
I 
0.73 
5 
599 
0.43 
322 
0.57 
SimS juveniles 
J9 
5 
233 
0.27 
48 
0.71 
5 
131 
0.34 
41 
0.40 
J10 
5 
201 
0.22 
356 
0.56 
5 
160 
0.21 
334 
0.79 
Jl 1 
5 
958 
0.27 
66 
0.57 
6 
958 
0.22 
23 
0.77 
J12 
5 
412 
0.21 
304 
0.68 
5 
412 
0.17 
23 
0.71 
J13 
5 
688 
0.38 
17 
0.64 
6 
184 
0.45 
15 
0.45 
J14 
5 
63 
0.36 
13 
0.96 
3 
95 
0.55 
334 
0.96 
J15 
4 
90 
0.31 
17 
0.77 
NA 
J16 
5 
96 
0.26 
19 
0.85 
NA 
after control tests. Each holding room was used 
tor one of two experimental treatments. One 
gioup was exposed to values of magnetic intensity 
and inclination that simulated displacement, or 
locations, to the north towards the equator and 
beyond their normal wintering areas (simulated 
north or ‘SimN" group: Table 1, Fig. 1). The 
‘SimS’ group was exposed to magnetic held 
values that simulated displacement, or locations, 
to the south, towards breeding areas in Tasmania 
(Table I, Fig. 1). The values of magnetic intensity 
or inclination for both the SimS and SimN groups 
