Overview

Distribution

Range Description

Thalassarche impavida breeds only on the northern and western coastline of Campbell Island (111 km2) and the tiny offshore islet, Jeanette Marie, New Zealand. The total population was estimated to be 19,000-26,000 breeding pairs (Moore and Moffat 1990), with the most recent censuses in 1995-1997 giving an estimate of 24,600 pairs (Moore 2004). Numbers decreased steeply between the 1970s and 1980s: one colony declined at a rate of 5.9% per year between 1966 and 1981, and 10.5% per year between 1981 and 1984. However, numbers have been either stable or increasing slightly since 1984 (Waugh et al. 1999a),with a 1.8% increase recorded in selected colonies between 1992 and 1997 (Moore 2004). Its non-breeding range is confined to southern Australian waters, the Tasman Sea and the south Pacific Ocean (Croxall and Gales 1998, Waugh et al. 1999b). Breeding adults forage from South Island, New Zealand, and Chatham Rise southwards to the Ross Sea (Waugh et al. 1999c, BirdLife International 2004).

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Range

Campbell Islands and adjacent islands off New Zealand.
  • Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2014. The eBird/Clements checklist of birds of the world: Version 6.9. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/

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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Behaviour This species breeds annually and is present in colonies from April to May. Eggs are laid from late September to early October, hatching mostly in early December and chicks fledge from mid April to early May (ACAP 2009). Mean annual productivity was 66% between 1984 and 1994. Mean adult survivorship was 94.5% between 1984 and 1995. Birds return to land at age 5 (ACAP 2009) and the average age of first breeding is 10 years (Waugh et al. 1999a). It feeds by surface-seizing and is probably capable of shallow dives (ACAP 2009). Habitat Breeding Campbell Albatross nests on ledges and steep slopes covered in low native grasses, tussocks and mud (Brooke 2004). Diet It feeds mainly on fish, also on squid, crustaceans, gelatinous organisms and carrion (Cherel et al. 1999). The diet during the chick-rearing period is dominated by juvenile southern blue whiting Micromesistius australis (ACAP 2009). Foraging range Satellite-tracking studies indicated that birds provisioning chicks predominantly foraged over neritic waters during trips lasting less than four days, with some long trips of 8-21 days over oceanic waters. The foraging range during short trips extended 150-640 km from the breeding colony, mainly over subantarctic waters within the 1,000 m depth contour on the Campbell Plateau. Longer trips extended up to 2,000 km from the colony, ranging from subtropical to Antarctic waters, but mainly to the Polar Frontal Zone or to the east of the Campbell Plateau. This plasticity in foraging behaviour is in contrast to the exclusively neritic feeding trips observed in T. melanophrys at some sites, though not others(ACAP 2009).


Systems
  • Terrestrial
  • Marine
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Source: IUCN

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
D2

Version
3.1

Year Assessed
2012

Assessor/s
BirdLife International

Reviewer/s
Butchart, S. & Symes, A.

Contributor/s
Molloy, J., Moore, P., Robertson, C., Stahl, J.-C. & Taylor, G.A.

Justification
This species is classified as Vulnerable because breeding is restricted to a single location, where it is susceptible to potential human impacts and stochastic events. Although numbers decreased steeply between the 1970s and 1980s owing to interactions with fisheries, the population is now thought to be increasing, although there has not been a census since 1996


History
  • Vulnerable (VU)
  • Vulnerable (VU)
  • Vulnerable (VU)
  • Vulnerable (VU)
  • Vulnerable (VU)
  • Vulnerable (VU)
  • Not Recognized (NR)
  • Not Recognized (NR)