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The site was identified as internationally important for bird conservation in 2019 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.

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

Species	Red List	Season (year/s of estimate)	Size	IBA criteria
Lesser Flamingo Phoeniconaias minor	NT	non-breeding (2014–2017)	27–45 birds	B1a
Black Heron Egretta ardesiaca	LC	non-breeding (1988)	1,354 birds	A4i
Western Reef-egret Egretta gularis	LC	non-breeding (1988)	2,244 birds	A4i
Grey Plover Pluvialis squatarola	VU	winter (-)	3,200 birds	A4i
Common Ringed Plover Charadrius hiaticula	LC	winter (2014–2019)	853–3,156 birds	B3a
Kentish Plover Charadrius alexandrinus	LC	winter (-)	1,500 birds	A4i
Bar-tailed Godwit Limosa lapponica	NT	winter (2014–2017)	303–633 birds	B1a
Ruddy Turnstone Arenaria interpres	NT	winter (-)	700 birds	A4i
Red Knot Calidris canutus	NT	winter (2014–2017)	73–143 birds	B1a
Curlew Sandpiper Calidris ferruginea	VU	winter (2014–2017)	802–1,966 birds	B1a
Collared Pratincole Glareola pratincola	LC	non-breeding (1983)	2,500 birds	A4i
Slender-billed Gull Larus genei	LC	winter (2014–2017)	219–287 birds	B3a
Common Gull-billed Tern Gelochelidon nilotica	LC	winter (2014–2017)	377 birds	B3a
Caspian Tern Hydroprogne caspia	LC	non-breeding (2014–2017)	1,586–3,975 birds	A4, B3a
Red-throated Bee-eater Merops bulocki	LC	resident (1997)	present	A3
Blue-bellied Roller Coracias cyanogaster	LC	resident (1997)	present	A3
Senegal Parrot Poicephalus senegalus	LC	resident (1997)	present	A3
Yellow-billed Shrike Lanius corvinus	LC	resident (1997)	present	A3
Piapiac Ptilostomus afer	LC	resident (1997)	present	A3
Purple Starling Lamprotornis purpureus	LC	resident (1997)	present	A3
Bronze-tailed Starling Lamprotornis chalcurus	LC	resident (1997)	present	A3
White-fronted Black-chat Oenanthe albifrons	LC	resident (1997)	present	A3
Lavender Waxbill Glaucestrilda coerulescens	LC	resident (1997)	present	A3
Grey-headed Oliveback Delacourella capistrata	LC	resident (1997)	present	A3

Ideally the conservation status of the IBA will have been checked regularly since the site was first identified in 2019. The most recent assessment (2024) is shown below.

State (condition of the trigger species' habitats)
Habitat	Quantity (% remaining)	Quality (% carrying capacity)	Result
Forest	moderate (70–90%)	poor (40–69%)	very poor

Pressure (threats to the trigger species and/or their habitats)
Threat	Timing	Scope	Severity	Result
Agricultural expansion and intensification	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Pollution	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Biological resource use	happe­ning now	some of popul­ation/area (10–49%)	slow decline (1–10% over 3 gener­ations)	medium
Climate change and severe weather	happe­ning now	some of popul­ation/area (10–49%)	no or slight decline (<1% over 3 gener­ations)	low
Energy production and mining	happe­ning now	few indivi­duals/small area (<10%)	no or slight decline (<1% over 3 gener­ations)	low

Response (conservation actions taken for the trigger species and/or their habitats)
Designation	Planning	Action	Result
Little/none of area covered (<10%)	No management plan exists, but the management planning process has begun	Some limited conservation initiatives are in place	low

Habitat	% of IBA	Habitat detail
Forest	75
Artificial/Terrestrial	16
Savanna	5
Shrubland	1

Land use	% of IBA
nature conservation and research	-

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Recommended citation
BirdLife International (2024) Important Bird Area factsheet: Rio Mansôa and Gêba estuary (Guinea-Bissau). Downloaded from https://datazone.birdlife.org/site/factsheet/rio-mansôa-and-gêba-estuary-iba-guinea-bissau on 23/12/2024.