A population and distributional study of white-capped albatross - - PowerPoint PPT Presentation

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Dec 22, 2022 320 likes •470 views

A population and distributional study of white-capped albatross (Auckland Islands) Contract POP20 0 5/ 0 2 David Thom pson, Leigh Torres & Paul Sagar Disappointm ent Island ~ 10 0 ,0 0 0 South West Cape ~ 5,0 0 0 Adam s Island ~ 10

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A population and distributional study

f white-capped albatross (Auckland

Islands)

Contract POP20 0 5/ 0 2

David Thom pson, Leigh Torres & Paul Sagar

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Disappointm ent Island ~ 10 0 ,0 0 0 South West Cape ~ 5,0 0 0 Adam s Island ~ 10 0

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20 0 8 / 0 9 breeding season…

Fieldwork during incubation (Nov-Dec),

plus short visit during chick-guard (Feb)

Banding and re-sighting adults

– 120 breeding adults, 55 pairs

Breeding frequency, nest occupancy
GPS tracking at South West Cape
PTT tracking at Disappointm ent Isl.
Retrieval of geolocation tags

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Tracking…

GPS data acquired to augm ent 0 7/ 0 8 data
15 PTTs deployed at Disappointm ent Isl.
10 geolocation tags retrieved - 23 data sets

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Sum m ary of geolocation data…

To date 3 of 23 (13%) birds m igrate to

South Africa (~ 10 -20 %)

Migration destinations appear consistent
Most within Australasia → NZ’s EEZ
NW Tasm ania
Im plications for fishing m ortality

estim ates

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Prelim inary nesting observations…

In 0 8 / 0 9 ~ 38 % nests unused
Pop. estim ates for 0 6/ 0 7, 0 7/ 0 8 & 0 8 / 0 9

– Disappointm ent: ~ 111k, 8 6k & 92k – SW Cape: ~ 6.5k, 4.8 k & 5.3k

Only ~ 37% successful birds in 0 6/ 0 7 attem pted

to breed in 0 7/ 0 8 , 52% for 0 7/ 0 8 and 0 8 / 0 9

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Conclusions…

Data point towards white-capped albatross

being predom inantly a biennial breeder

Adult white-capped albatross dispersive