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The site was identified as internationally important for bird conservation in 2007 because it was regularly supporting significant populations of the species listed below, meeting IBA criteria.

Populations meeting IBA criteria ('key species') at the site:

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Kagu Rhynochetos jubatus	EN	resident (2002)	present	A1, A2
New Caledonian Imperial-pigeon Ducula goliath	NT	resident (2002)	present	A2
Cloven-feathered Dove Drepanoptila holosericea	LC	resident (2002)	present	A2
New Caledonian Owlet-nightjar Aegotheles savesi	CR	resident (1998)	present	A1, A2
White-winged Petrel Pterodroma leucoptera	VU	breeding (2002)	4,000–8,000 breeding pairs	A1, A4ii
White-bellied Goshawk Accipiter haplochrous	NT	resident (2002)	present	A2
Horned Parakeet Eunymphicus cornutus	VU	resident (2002)	present	A2
Red-fronted Parakeet Cyanoramphus novaezelandiae	LC	resident (2002)	present	A1, A2
Grey-eared Honeyeater Lichmera incana	LC	resident (2002)	present	A2
Crow Honeyeater Gymnomyza aubryana	CR	resident (2002)	present	A1, A2
New Caledonian Friarbird Philemon diemenensis	LC	resident (2002)	present	A2
New Caledonian Myzomela Myzomela caledonica	LC	resident (2002)	present	A2
Barred Honeyeater Gliciphila undulata	LC	resident (2002)	present	A2
Fan-tailed Gerygone Gerygone flavolateralis	LC	resident (2002)	present	A2
New Caledonian Whistler Pachycephala caledonica	LC	resident (2002)	present	A2
South Melanesian Cuckooshrike Coracina caledonica	LC	resident (2002)	present	A2
New Caledonian Cicadabird Edolisoma anale	NT	resident (2002)	present	A2
Long-tailed Triller Lalage leucopyga	LC	resident (2002)	present	A2
New Caledonia Streaked Fantail Rhipidura verreauxi	LC	resident (2002)	present	A2
Melanesian Flycatcher Myiagra caledonica	LC	resident (2002)	present	A2
Southern Shrikebill Clytorhynchus pachycephaloides	LC	resident (2002)	present	A2
New Caledonian Crow Corvus moneduloides	LC	resident (2002)	present	A2
Yellow-bellied Robin Cryptomicroeca flaviventris	LC	resident (2002)	present	A2
New Caledonian Thicketbird Cincloramphus mariae	LC	resident (2002)	present	A2
Green-backed White-eye Zosterops xanthochroa	LC	resident (2002)	present	A2
Striated Starling Aplonis striata	LC	resident (2002)	present	A2
Red-throated Parrotfinch Erythrura psittacea	LC	resident (2002)	present	A2

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2007. The most recent assessment (2013) is shown below.

State (condition of the key species' populations)
Species	Actual vs Reference (units)	% remaining	Result
Kagu Rhynochetos jubatus	1,000 / 200 (individuals)	100	favourable
White-winged Petrel Pterodroma leucoptera	2,000 / 10,000 (individuals)	20	very unfavourable
Crow Honeyeater Gymnomyza aubryana	150 / 300 (breeding pairs)	50	unfavourable

Pressure (threats to the key species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Invasive and other problematic species and genes	happen­ing now	whole popul­ation/area (>90%)	slow deteri­oration (1–10% over 3 gener­ations)	high
Energy production and mining	happen­ing now	some of popul­ation/area (10–49%)	rapid deteri­oration (>30% over 3 gener­ations)	high
Natural system modifications	happen­ing now	some of popul­ation/area (10–49%)	rapid deteri­oration (>30% over 3 gener­ations)	high
Biological resource use	happen­ing now	some of popul­ation/area (10–49%)	slow deteri­oration (1–10% over 3 gener­ations)	medium

Response (conservation actions taken for the key species and/or their habitats)
Designation	Planning	Action	Result
Some of site covered (10–49%)	Unknown	Substantive conservation measures are being implemented, but these are not comprehensive and are limited by resources and capacity	low

Year	Protected Area	Designation (management category)	% coverage of IBA
1950	Montagne des Sources	Strict Nature Reserve (Ia)	8
1950	Mont Humboldt	Special Botanical Reserve (IV)	2
1960	Reserve Speciale de Faune de la Haute Yate	Special Fauna Reserve (IV)	2
1980	Parc Territorial de la Riviere Bleue	Territorial Park (II)	12
1980	Provincial de Thy	Territorial Park (II)	2

Habitat	% of IBA	Habitat detail
Forest	major (>10)

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Recommended citation
BirdLife International (2025) Important Bird Area factsheet: Massifs du Grand Sud - entre le mont Humboldt et la rivière Bleue (New Caledonia (to France)). Downloaded from https://datazone.birdlife.org/site/factsheet/massifs-du-grand-sud--entre-le-mont-humboldt-et-la-rivière-bleue-iba-new-caledonia-(to-france) on 14/01/2025.