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Location Madagascar, Toliara
Central coordinates 43o 39.00' East  21o 38.00' South
IBA criteria A1, A2, A3, A4i
Area 139,520 ha
Altitude 6 - 50m
Year of IBA assessment 2001

Asity Madagascar (Affiliate)

Site description This complex is located 30 km north-east of Morombe, and comprises Lake Ihotry, the Mangoky river and delta, and associated riverine marshes near the Ankiliabo–Nosy Ambositra road. The lake is brackish and c.3 m deep. Its area varies seasonally, from 960 ha up to 11,200 ha, and it is only sparsely vegetated, with some reed Phragmites, sedge Cyperus and water-lily Nymphaea. Mangrove, dominated by Rhizophora and Avicennia, occurs all along the delta coast, from Mangolovolo to Andranopasy. The marsh vegetation consists mainly of Cyperus, reed-mace Typha, Typhonodorum, Phragmites and Nymphaea. Near the wetlands, on sandy soil, there is dry deciduous forest, dominated by Didiereaceae and Euphorbiaceae, as well as sub-arid spiny bushland, and savanna with occasional trees of Tamarindus and Zizyphus.

Key Biodiversity See Box and Tables 2 and 3 for key species. One hundred and six species are known from this site, of which 23 are endemic to Madagascar. Amaurornis olivieri was found in the marsh of Nosy Ambositra in 1960, but has not been recorded since then. Lake Ihotry is an exceptional site for foraging and roosting waterbirds, notably during the northern winter. During the dry season, muddy areas attract large numbers of waders, and the site is also a dry-season refuge for waterbirds that use the seasonal wetlands between Morombe and Toliara. Significant numbers of Phoenicopterus ruber and Tachybaptus ruficollis have been observed, and also large numbers of other birds, such as Anas erythrorhyncha and Tringa nebularia.

Non-bird biodiversity: Lemurs: Lemur catta (VU), Propithecus verreauxi verreauxi (VU). Carnivore: Cryptoprocta ferox (VU).

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Little Grebe Tachybaptus ruficollis non-breeding  1997  620 individuals  A4i  Least Concern 
Madagascar Grebe Tachybaptus pelzelnii resident  1997  present  A1  Vulnerable 
Lesser Flamingo Phoeniconaias minor non-breeding  1997  present  A1  Near Threatened 
Madagascar Crested Ibis Lophotibis cristata resident  1997  present  A1  Near Threatened 
Madagascar Pond-heron Ardeola idae breeding  1997  present  A1  Endangered 
Madagascar Heron Ardea humbloti resident  1997  present  A1, A2, A3  Endangered 
Madagascar Fish-eagle Haliaeetus vociferoides resident  1997  present  A1, A2, A3  Critically Endangered 
Madagascar Marsh-harrier Circus macrosceles resident  1997  present  A1  Vulnerable 
Sakalava Rail Zapornia olivieri resident  1962  present  A1, A2, A3  Endangered 
Crab-plover Dromas ardeola non-breeding  1997  500 individuals  A4i  Least Concern 
Black-banded Plover Charadrius thoracicus resident  1997  50 individuals  A1, A2, A3, A4i  Vulnerable 
Madagascar Jacana Actophilornis albinucha resident  1997  present  A2  Near Threatened 
Whiskered Tern Chlidonias hybrida non-breeding  1997  503 individuals  A4i  Least Concern 
Sickle-billed Vanga Falculea palliata resident  1997  present  A3  Least Concern 

IBA Monitoring

2013 high not assessed medium

Agriculture and aquaculture annual & perennial non-timber crops - shifting agriculture happening now majority/most of area/population (50-90%) moderate to rapid deterioration high
Biological resource use fishing & harvesting aquatic resources - unintentional effects: subsistence/small scale happening now some of area/population (10-49%) moderate to rapid deterioration high
Climate change and severe weather temperature extremes happening now majority/most of area/population (50-90%) slow but significant deterioration high
Geological events avalanches/landslides happening now majority/most of area/population (50-90%) slow but significant deterioration high

Whole area of site (>90%) covered by appropriate conservation designation  No management plan exists but the management planning process has begun  Substantive conservation measures are being implemented but these are not comprehensive and are limited by resources and capacity  medium 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Lac Ihotry Hunting Reserve 0 protected area contains site 0  


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Mangroves; Permanent herbaceous swamps and bogs; Rivers & streams  55%
Forest Lowland forest - dry deciduous  20%

Land use

Land-use Extent (% of site)
agriculture -
forestry -
other -
Notes: Cutting mangroves for bark and timber.

References Appert (1966,1968a, 1970, 1972), Griveaud (1960), Jenkins (1987), Rand (1936), Salomonsen (1934a), World Wide Fund for Nature–Madagascar (1997).

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Complexe de la Reserve de Chasse du Lac Ihotry - Delta de Mangoky. Downloaded from on 26/10/2016

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