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New Zealand Grebe Poliocephalus rufopectus

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable C2a(i) 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Endangered
1994 Endangered
1988 Lower Risk/Least Concern

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass 249 g

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 87,500 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 1200-1400 medium Estimated 2012
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 5.3 - - -
Population justification: The population has been estimated at c.1,900-2,000 birds (Heather and Robertson 1997, Sachtleben in prep.), thus the number of mature individuals is put at 1,200-1,400, based on the assumption that mature individuals account for around 2/3 of the total population.
Trend justification: The species appears to be stable or increasing in some parts of its range (Marchant and Higgins 1990, Sachtleben in prep.), but the overall population is precautionarily suspected to be in decline owing primarily to habitat loss and modification and the impacts of human disturbance and introduced predators.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
New Zealand Native Extant       Yes

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Aquatic & Marine Water Storage Areas (over 8ha) major resident
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) major resident
Altitude 0 - 800 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Marine & freshwater aquaculture / Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species disturbance
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species disturbance
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Australasian Grebe (Tachybaptus novaehollandiae) Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Competition
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Common Brushtail (Trichosurus vulpecula) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Ferret (Mustela furo) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Least Weasel (Mustela nivalis) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Stoat (Mustela erminea) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Unspecified rats (Rattus spp.) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Reduced reproductive success

Recommended citation
BirdLife International (2014) Species factsheet: Poliocephalus rufopectus. Downloaded from http://www.birdlife.org on 22/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/09/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Podicipedidae (Grebes)
Species name author Gray, 1843
Population size 1200-1400 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 87,500 km2
Country endemic? Yes
Links to further information
- Summary information on this species