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Alaska Ecosystems Program
Demography of Northern Fur Seals on the Pribilof Islands
(cont.)
(pg
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, 2)
Research Reports
Jan-Feb-Mar 2014
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Table 1. Annual tag loss from tag transitions (2 tags to 1 tag) for adult female northern fur seals on St. Paul Island.
Tag types and ages
n2
n1
single
loss rate
SE
double
loss rate
SE
Dalton Superflexitag (DS)-new
103
9
0.042
0.014
0.002
0.001
DS-2nd yr
61
7
0.054
0.020
0.003
0.002
DS-2+ yrs
101
4
0.019
0.010
0.000
0.000
Allflex “narrow” (AN)
83
0
0
0.000
AN w/metal-new
103
0
0
metal w/AN-new
99
5
0.048
0.021
0
AN w/metal-old
239
2
0.008
0.006
metal w/AN-old
239
1
0.004
0.004
0.000
0.000
Allflex large (AL)-old
27
2
0.036
0.025
0.001
0.001
AL w/radio-tag (TX)-new
71
2
0.027
0.019
AL w/TX old
109
0
0
Table 2. Cumulative tag loss after initial tagging as pups, with Dalton Superflexitags (DS), for the 2009 pup cohort on St. George Island.
Tag types and ages
n2
n1
single
loss rate
SE
double loss rate
SE
DS(left)-2 yrs
34
29
0.460
0.063
DS(right)-2 yrs
34
15
0.306
0.066
0.141
0.036
DS(left)-3 yrs
61
42
0.408
0.048
DS(right)-3 yrs
61
26
0.299
0.049
0.122
0.025
DS(left)-4 yrs
67
60
0.472
0.044
DS(right)-4 yrs
67
43
0.391
0.047
0.185
0.028
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