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Alaska Ecosystems Program

Demography of Northern Fur Seals on the Pribilof Islands (cont.) (pg 1, 2)

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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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