CR
Southern Red-breasted Plover Charadrius obscurus



Taxonomy

Taxonomic note
Charadrius obscurus and C. aquilonius (del Hoyo and Collar 2014) were previously lumped as C. obscurus following Sibley and Monroe (1990, 1993).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
A4a; C1+2a(ii) A4a; B1ab(i,ii,iv,v); C1+2a(i,ii); D A4a; B1ab(i,ii,iv,v); C1+2a(i,ii); D1

Red List history
Year Category Criteria
2017 Critically Endangered A4a; C1+2a(ii)
2016 Endangered D
2014 Endangered D
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,200 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 60-80 good estimated 2017
Population trend Decreasing medium observed -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) 95 - - -
Number of subpopulations 1 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 5 - - -

Population justification: The population reached a low of 62 birds in 1992, but following intensive management the post-breeding population has fluctuated between 240 and 290 birds since 2005 (Dowding 2013). Although management has continued, the population has declined catastrophically since 2012 for reasons that are not clear. The population is now approximately 120 individuals, with potentially no more than 30-40 pairs (60-80 mature individuals) (J. Dowding in litt. 2016).

Trend justification: The population has declined catastrophically since 2012 for reasons that are not clear. The recent decline has been 54% in the 4 years 2012-2016 (J. Dowding in litt. 2016), equating to an ongoing decline of c.95% decline over three generations (15 years); c.86% over two generations; and c.62% over one generation. The reason for the sudden decline since 2012 is not known.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
New Zealand Paterson Inlet The Neck
New Zealand Port Adventure
New Zealand Port Pegasus
New Zealand Bluff Harbour Awarua Bay
New Zealand Omaui Island Oreti Estuary
New Zealand North Coast Rakiura

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Temperate major breeding
Marine Coastal/Supratidal Coastal Sand Dunes suitable resident
Marine Intertidal Mud Flats and Salt Flats suitable resident
Marine Intertidal Rocky Shoreline suitable resident
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc suitable resident
Marine Intertidal Shingle and/or Pebble Shoreline and/or Beaches suitable resident
Marine Intertidal Tidepools suitable resident
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major resident
Altitude 0 - 1000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species disturbance
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Ammophila arenaria Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Canis familiaris Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Erinaceus europaeus Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Declines Medium Impact: 7
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Mustela erminea Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Reduced reproductive success, Species mortality
Residential & commercial development Commercial & industrial areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2021) Species factsheet: Charadrius obscurus. Downloaded from http://www.birdlife.org on 22/01/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/01/2021.