Begonia preussii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Cucurbitales Begoniaceae

Scientific Name: Begonia preussii Warb.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c ver 3.1
Year Published: 2015
Date Assessed: 2011-03-25
Assessor(s): Cheek, M.
Reviewer(s): Onana, J.-M.
Facilitator/Compiler(s): Lopez Poveda, L.
This epiphytic lowland forest begonia was previously assessed as Endangered (Cable and Cheek 1998) but is here downlisted to Vulnerable in the light of the taxonomic revision by de Wilde (2002, source of the range data above) showing it to be more common and widespread in Cameroon than was previously thought. In addition, the discovery of eight further specimens at five sites in Mt Kupe-Bakossi Mts confirms the foregoing. Nonetheless, due to the altitudinal range of this taxon, ongoing habitat loss of more than 30% over the past 15 years (estimated as equating to a 30% population reduction over the past three generations) and in the near future can be postulated, specifically due to the loss of the species through ongoing loss of trees in population centres from the following five locations: Nkongsamba, Loum, Tape, Buea, Kumba (M. Cheek pers. obs.), and due to the expected loss at other locations, such as the Mokoko forest in the near future, due to habitat degradation and conversion. The conservation assessment of this species in Cheek et al. (2004) is maintained here since no additional data are available apart from a new record at Lebialem which needs further confirmation since it extends the range of the species  much further north, and has a much higher altitude (1,486 m) than all others. Its forest habitat at this site is extremely threatened by agricultural clearance.
Previously published Red List assessments:

Geographic Range [top]

Range Description:The species has been recorded from Nigeria (three collections at three locations); Equatorial Guinea (Bioko) (three collections at two localities); Cameroon: mostly in the Southwest and Littoral Regions, but also with occurrences in the Central and South Regions - Mbalomayo-Kribi-Edea-Korup-Lebialem (+24 collections).
Countries occurrence:
Cameroon; Equatorial Guinea (Bioko); Nigeria
Additional data:
Estimated area of occupancy (AOO) - km2:108-124Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:68642-70152
Number of Locations:16-20Continuing decline in number of locations:Yes
Upper elevation limit (metres):1486
Range Map:Click here to open the map viewer and explore range.

Population [top]


The population size is not known but is declining due to loss of locations and habitat degradataion

Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:An epiphyte that grows in evergreen forest from sea-level up to -1,000(-1,486?) m asl.
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):5

Threats [top]

Major Threat(s): Clearance of forest for wood and agriculture, both small-holder and plantations, is a major threat throughout its range and probably accounts for the lack of collections from Bioko in the last century (where forest was largely cleared below 1,000 m alt.). More than 30% of its historical sites have seen severe habitat degradation or total loss due to plantations of rubber, bananas, oil palm, tea and coffee, and for those near towns, expanding urbanization.

Conservation Actions [top]

Conservation Actions: This taxon is most likely to survive in lowland forest reserves such as the Bakossi Forest Reserve and Mokoko Forest Reserve, but only if their boundaries are respected and they are not scheduled for logging as is feared. Resources need to be found to upgrade such sites to National Parks.

Citation: Cheek, M. 2015. Begonia preussii. The IUCN Red List of Threatened Species 2015: e.T39503A2927990. . Downloaded on 25 June 2018.
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