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Location Kenya, Western Province
Central coordinates 34o 1.00' East  0o 14.00' North
IBA criteria A1, A3
Area 400 ha
Altitude 1,130 m
Year of IBA assessment 2001


Site description This site is a papyrus Cyperus papyrus swamp at the extreme north of the Kenyan section of Lake Victoria, on the Kenya/Uganda border. The site consists of mature, almost undisturbed, continuous papyrus stands, stretching from the mouth of the Sio river southwards for about 3.5 km along the lakeshore.

Key Biodiversity See Box and Table 3 for key species. This is an important site for Lake Victoria biome species, especially three papyrus endemics: Laniarius mufumbiri (relatively common), Bradypterus carpalis and Serinus koliensis. The globally threatened Chloropeta gracilirostris is not yet recorded but is likely to occur.

Non-bird biodiversity: None known to BirdLife International.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Papyrus Gonolek Laniarius mufumbiri resident  1999  present  A1, A3  Near Threatened 
Carruthers's Cisticola Cisticola carruthersi resident  1999  present  A3  Least Concern 
White-winged Scrub-warbler Bradypterus carpalis resident  1999  present  A3  Least Concern 
Sharpe's Pied-babbler Turdoides sharpei resident  1999  present  A3  Least Concern 
Red-chested Sunbird Nectarinia erythrocerca resident  1999  present  A3  Least Concern 
Northern Brown-throated Weaver Ploceus castanops resident  1999  present  A3  Least Concern 
Papyrus Canary Serinus koliensis resident  1999  present  A3  Least Concern 

IBA Monitoring

2006 not assessed not assessed not assessed
Poor - based on little, or potentially unreliable/unrepresentative, data


IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland) Permanent herbaceous swamps and bogs  100%

Land use

Land-use Extent (% of site)
agriculture -
other -
Notes: cutting of papyrus

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Recommended citation  BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Sio Port swamp. Downloaded from on 28/10/2016

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