Bedotia geayi 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Atheriniformes Bedotiidae

Scientific Name: Bedotia geayi
Species Authority: Pellegrin, 1907
Common Name(s):
English Zona

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii,iv,v) ver 3.1
Year Published: 2016
Date Assessed: 2016-06-21
Assessor(s): Ravelomanana, T., Sparks, J.S. & Loiselle, P.V.
Reviewer(s): Randrianizahaisa, H., Rasoloariniaina, R & Velosoa, J.
Contributor(s): Participants of the CBSG/ANGAP CAMP "Faune de Madagascar" workshop, Mantasoa, Madagascar 2001
Facilitator/Compiler(s): Darwall, W.R.T.
Justification:
Known only from the Mananjary drainage. Its presence in rivers to the north remains a possibility but needs confirmation. In the adjacent Namorona drainage the species is replaced by Bedotia sp. Ranomafana. Habitat degradation and pressure from exotic predators (Gambusia holbrooki) and competitors (Xiphophorus spp.) have largely eliminated B. geayi from low altitude (< 100 m a.s.l) habitats, however, it remains abundant in the middle and upper reaches of the Mananjary. Pending major shifts in land use in the basin, this species is assessed as Endangered on the basis of its Extent of Occurrence being less than 5000 km², with a continuing decline in distribution due to the above mentioned pressures.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Bedotia geyai is endemic to Madagascar. It is known from the Mananjary river (Loiselle and Rodriguez 2007).
Countries occurrence:
Native:
Madagascar
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:1928
Continuing decline in extent of occurrence (EOO):Yes
Number of Locations:1Continuing decline in number of locations:Yes
Lower elevation limit (metres):300
Upper elevation limit (metres):650
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species was not difficult to find along the river followed by the national road N°25 near Kianjavato (Ravelomanana, pers obs).
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Bedotia geayi inhabits small streams flowing under partial or complete forest cover (Loiselle and Rodriguez, 2007).
Systems:Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There is no use or trade information available for this species.

Threats [top]

Major Threat(s): This species has not been collected from low altitude habitats in the Mananjary basin for some time. This is may be due to the fact that the immediate hinterland of the town of Mananjary has undergone extensive anthropogenic modification. This process favours exotic species, which are better adapted to deal with increased silt loads and higher water temperatures that follow deforestation than are the majority of Madagascar’s native fishes (Loiselle and Rodriguez, 2007).

Conservation Actions [top]

Conservation Actions: Probably a part of the population is included in the protected area "Fandriana - Vondrozo corridor".

Classifications [top]

5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)
suitability:Suitable  
2. Land/water management -> 2.1. Site/area management
2. Land/water management -> 2.2. Invasive/problematic species control
4. Education & awareness -> 4.3. Awareness & communications

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education
5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.2. Intentional use: (large scale) [harvest]
♦ timing:Ongoing ♦ scope:Majority (50-90%) ♦ severity:Slow, Significant Declines ⇒ Impact score:Medium Impact: 6 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

8. Invasive and other problematic species, genes & diseases -> 8.1. Invasive non-native/alien species/diseases -> 8.1.1. Unspecified species
♦ timing:Ongoing ♦ scope:Majority (50-90%) ♦ severity:Slow, Significant Declines ⇒ Impact score:Medium Impact: 6 
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.2. Competition

1. Research -> 1.2. Population size, distribution & trends
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Baillie, J. and Groombridge, B. (eds). 1996. 1996 IUCN Red List of Threatened Animals. pp. 378. International Union for Conservation of Nature, Gland, Switzerland and Cambridge, UK.

Groombridge, B. (ed.). 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-3. Available at: www.iucnredlist.org. (Accessed: 07 December 2016).

Loiselle, P.V. and Rodriguez, D. 2007. A new species of Bedotia (Teleostei: Atherinomorpha: Bedotiidae) from the Rianila drainage of eastern Madagascar, with redescriptions of Bedotia madagascariensis and Bedotia geayi. Zootaxa 1520: 1-18.

Loiselle, P.V. and Stiassny, M.L.J. 2003. Bedotia. In: S.M. Goodman and J.P. Benstead (eds), The Natural History of Madagascar, pp. 867-868. University of Chicago Press, Chicago.

Pellegrin, J. 1907. Liste des poissons recueillis à Madagascar par M.F. Geay. Description d’une espèce nouvelle. Bulletin du Muséum National d'Histoire Naturelle 30:201-206.


Citation: Ravelomanana, T., Sparks, J.S. & Loiselle, P.V. 2016. Bedotia geayi. In: The IUCN Red List of Threatened Species 2016: e.T2719A58293954. . Downloaded on 09 December 2016.
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