auckland island seabirds - department of conservation · kalinka rexer-huber, graham parker kath...
TRANSCRIPT
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Kalinka Rexer-Huber, Graham Parker
Kath Walker, Graeme Elliott, David Thompson
May 2019
Auckland Island seabirdsGibson’s and white-capped albatross
and white-chinned petrel 2018–19
Project POP2017-04
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Introduction
Long-lived, slow-breeding, high conservation concern,
vulnerable to accidental capture in fisheries
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Est: 2015
Est: 2013
Est: 1991
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Mark-recapture, tracking
white-chinned
Gibson’s
white-capped
Scope
Gibson’s albatross
Population size
Update survival, productivity and recruitment
White-capped albatross
Nest cams
Aerial photos
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nine days 15–25 Dec
study burrows
• resightings
• banding new
breeders
burrow switch checks
new study burrows
White-chinned petrels
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White-chinned petrels
Three GLS recovered
Recapture rate 0.27 (n=47)
• 0.35 two years ago
• only a quarter changed over
(9d)
Some burrow-switching
• 3 in new burrows 2–5m away
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• 230 banded in 131 study burrows (+54 new)
• 4 yrs—no modelling yet—data look suitable
White-chinned petrels
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Gibson’s albatross
4 December–30 January
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Gibson’s tracking
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Gibson’s productivity
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Gibson’s survival
An
nu
al s
urv
ival
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Gibson’s census blocks
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Gibson’s population trend
nest success
n stabilised
n chicks
survival
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White-capped albatross
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White-capped albatross
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Bands deployed
• 2015: 150
• 2016: 83
• 2017: 160
• 2018: 128
• 2019: 122
Banded population 643 birds
(+ historic bands)
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WCA recaptures
Resighting rates
21% of 150 in 2016
24% of 233 in 2017
33% of 393 in 2018
34% of 557 in 2019
3 d on island
2.5 d
2.5 d
2.5 d
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White-capped albatross
Study impact and feasibility
• Nervous species
• Steep terrain
• Windy
• Delicate island
• Challenging access
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WCA 2015-19
• Primary focus now resighting
• Marked population established
• Building recapture histories for robust survival
estimates
• Short visits but resighting rates encouraging
• Short visits limit changeovers
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• Up to 9½ months (from Jan 2018)
• Badly-corroded cameras only 2½ mo
• Full set 17,270 images reviewed
WCA nest camera trial
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Chick success
~0.29
(5 fledged of 17
nests followed
from late incub)
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• Fledging ~27 July (12 July–23 Aug)
• Adults first return to colony 30 Sept–10 Oct (2
cameras)—back full-time by 17 Oct (one camera)
• Low chick success; breeding success unknown but
will be lower yet
• Breeding success and failure rates
• Nest cams over 2 yrs to follow full breeding season
• More nests
WCA nest cams
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• Castaways B photographed 7 February
• 260 suitable photos archived
• Main difference: 3 wks later
• Correct with breeding failure rates during incub (nest cams)
WCA aerial photographs
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White-chinned petrel
• Data look good for demographic estimates given
more annual checks
Gibson’s albatross
• Recovery still slowed by relatively high annual
mortality and >10yrs low productivity
• Pop size, structure, trend should remain priorities
White-capped albatross
• Resighting priority, min 5d in Feb
• Breeding success, failure rates: nest cams over two
years
Recommendations
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Funding DOC and levy on quota holders of relevant
commercial fish stocks
DOC Murihiku Joseph Roberts, Sharon Trainor, John Peterson
and Rory Hannan, reception and duty officers
Igor Debski and DOC Maukahuka organised transport and
shared logistics
Heli pilot Brian Patterson and Steve Kafka and Evohe crew
provided safe passage to, around and from the islands
Acknowledgements