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Location Gabon, Ogooué-Maritime
Central coordinates 8o 50.00' East  0o 50.00' South
IBA criteria A1, A2, A3, A4i
Area 30,000 ha
Altitude 0 - 10m
Year of IBA assessment 2001





Site description Situated close to Port-Gentil on Cape Lopez, the westernmost part of Gabon, the site comprises much of Mandji island, in the delta of the Ogooué river. The area is mix of sand-dunes, coastal grasslands, swamps, small patches of littoral forests and Dalbergia ecastaphyllum thickets and mangroves. The southern half of Mandji island comprises extensive short-grass savannas on sandy soil, with herbaceous swamps, and areas of littoral forests characterized by Chrysobalanus icaco. Patches of dry forest occur, in which typical tree species include Sacoglottis gabonensis, Pachypodanthium confine and Cola flavovelutina, while Mitragyna ciliata is typical of the swamp-forests. Mangroves are extensive along the Ogooué and large areas of mudflat occur in Cape Lopez Bay.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Hartlaub's Duck Pteronetta hartlaubii resident  1999  present  A1, A3  Least Concern 
White-crested Tiger-heron Tigriornis leucolopha resident  1999  present  A3  Least Concern 
Grey-throated Rail Canirallus oculeus resident  1999  present  A3  Least Concern 
Royal Tern Thalasseus maximus winter  1,632 individuals  A4i  Least Concern 
Damara Tern Sternula balaenarum winter  430 individuals  A1, A4i  Near Threatened 
African Skimmer Rynchops flavirostris winter  116 individuals  A1, A4i  Near Threatened 
Western Bronze-naped Pigeon Columba iriditorques resident  1999  present  A3  Least Concern 
Blue-headed Wood-dove Turtur brehmeri resident  1999  present  A3  Least Concern 
Psittacus erithacus resident  1999  present  A3  Not Recognised 
Green Turaco Tauraco persa resident  1999  present  A3  Least Concern 
Yellow-billed Turaco Tauraco macrorhynchus resident  1999  present  A3  Least Concern 
Gabon Coucal Centropus anselli resident  1999  present  A3  Least Concern 
Cassin's Spinetail Neafrapus cassini resident  1999  present  A3  Least Concern 
Black Bee-eater Merops gularis resident  1999  present  A3  Least Concern 
Black-headed Bee-eater Merops breweri resident  1999  present  A3  Least Concern 
Rosy Bee-eater Merops malimbicus breeding  1999  unknown  A3  Least Concern 
Bycanistes fistulator resident  1999  present  A3  Not Recognised 
Tropicranus albocristatus resident  1999  present  A3  Not Recognised 
Tockus fasciatus resident  1999  present  A3  Not Recognised 
Dwarf Hornbill Lophoceros camurus resident  1999  present  A3  Least Concern 
Black-casqued Hornbill Ceratogymna atrata resident  1999  present  A3  Least Concern 
Dendropicos gabonensis resident  1999  present  A3  Not Recognised 
Brown-eared Woodpecker Campethera caroli resident  1999  present  A3  Least Concern 
Yellow-crested Woodpecker Dendropicos xantholophus resident  1999  present  A3  Least Concern 
Chestnut Wattle-eye Platysteira castanea resident  1999  present  A3  Least Concern 
Rufous-vented Paradise-flycatcher Terpsiphone rufocinerea resident  1999  present  A3  Least Concern 
African River-martin Pseudochelidon eurystomina breeding  1999  unknown  A1, A3  Data Deficient 
White-throated Blue Swallow Hirundo nigrita resident  1999  present  A3  Least Concern 
Chattering Cisticola Cisticola anonymus resident  1999  present  A3  Least Concern 
Olive-green Camaroptera Camaroptera chloronota resident  1999  present  A3  Least Concern 
Grey Greenbul Andropadus gracilis resident  1999  present  A3  Least Concern 
Swamp Greenbul Thescelocichla leucopleura resident  1999  present  A3  Least Concern 
Icterine Greenbul Phyllastrephus icterinus resident  1999  present  A3  Least Concern 
Lesser Bristlebill Bleda notatus resident  1999  present  A3  Least Concern 
Yellow-spotted Nicator Nicator chloris resident  1999  present  A3  Least Concern 
Grey Longbill Macrosphenus concolor resident  1999  present  A3  Least Concern 
Green Hylia Hylia prasina resident  1999  present  A3  Least Concern 
Rufous-crowned Eremomela Eremomela badiceps resident  1999  present  A3  Least Concern 
Green Crombec Sylvietta virens resident  1999  present  A3  Least Concern 
Brown Illadopsis Illadopsis fulvescens resident  1999  present  A3  Least Concern 
Purple-headed Glossy-starling Lamprotornis purpureiceps resident  1999  present  A3  Least Concern 
Chestnut-winged Starling Onychognathus fulgidus resident  1999  present  A3  Least Concern 
Rufous Flycatcher-thrush Stizorhina fraseri resident  1999  present  A3  Least Concern 
Alethe diademata resident  1999  present  A3  Not Recognised 
White-browed Forest Flycatcher Fraseria cinerascens resident  1999  present  A3  Least Concern 
Mouse-brown Sunbird Anthreptes gabonicus resident  1999  present  A3  Least Concern 
Violet-tailed Sunbird Anthreptes aurantium resident  1999  present  A3  Least Concern 
Little Green Sunbird Nectarinia seimundi resident  1999  present  A3  Least Concern 
Reichenbach's Sunbird Nectarinia reichenbachii resident  1999  present  A3  Least Concern 
Carmelite Sunbird Nectarinia fuliginosa resident  1999  present  A3  Least Concern 
Green-throated Sunbird Nectarinia rubescens resident  1999  present  A3  Least Concern 
Johanna's Sunbird Nectarinia johannae resident  1999  present  A3  Least Concern 
Superb Sunbird Nectarinia superba resident  1999  present  A3  Least Concern 
Loango Weaver Ploceus subpersonatus resident  1999  present  A1, A2, A3  Vulnerable 
Vieillot's Black Weaver Ploceus nigerrimus resident  1999  present  A3  Least Concern 
Black-throated Malimbe Malimbus cassini resident  1999  present  A3  Least Concern 
Gray's Malimbe Malimbus nitens resident  1999  present  A3  Least Concern 
Western Bluebill Spermophaga haematina resident  1999  present  A3  Least Concern 
Long-legged Pipit Anthus pallidiventris resident  1999  present  A3  Least Concern 
Speckled Tinkerbird Pogoniulus scolopaceus resident  1999  present  A3  Least Concern 
Yellow-throated Tinkerbird Pogoniulus subsulphureus resident  1999  present  A3  Least Concern 
Yellow-spotted Barbet Buccanodon duchaillui resident  1999  present  A3  Least Concern 
Hairy-breasted Barbet Tricholaema hirsuta resident  1999  present  A3  Least Concern 

Habitats

IUCN habitat Habitat detail Extent (% of site)
Shrubland   20%
Grassland   9%
Forest   70%

Land use

Land-use Extent (% of site)
urban/industrial/transport -

Other biodiversity Among mammals, a small population of Loxodonta africana (EN) survives in the southern part of Mandji island, and dolphins, possibly Sousa teuszii (DD), and Megaptera novaeangliae (VU) are regularly seen offshore.

References Alexander-Marrack (1990), Sargeant (1993), Schepers and Marteijn (1993).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Ogooué delta and Mandji island. Downloaded from http://www.birdlife.org on 25/07/2014

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