Polycyathus isabela 

Scope:Global
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_onStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Cnidaria Anthozoa Scleractinia Caryophylliidae

Scientific Name: Polycyathus isabela
Species Authority: Wells, 1982

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Chiriboga, A., Hickman, C., Edgar, G., Banks, S. & Vera, M.
Reviewer(s): Stuart, S.N. & Carpenter, K.E. (Global Marine Species Assessment Coordinating Team)
Justification:
Recorded as isolated colonies at only three sites on one island (i.e., Punta Albemarle, Punta Vicente Roca and Caleta Iguana). Extensive underwater surveys across Galápagos between 2000 and 2006 have revealed the presence of this species at only two sites. Although assessed here as Vulnerable using the D2 criterion associated with small range size and potential threat from the effects of El Niño, there is also concern that populations of P. isabela have declined in recent decades, as is evident for other local coral species. The population status of the type subpopulation from Punta Albemarle is unknown, although the species has not been sighted in recent searches in that region. The subpopulation from Punta Vicente Roca (sighted in 2003), has not been subsequently seen; despite this location having been surveyed since. While this evidence for decline may suggest listing as Endangered under criteria A or B, the paucity of records for this species makes it difficult to have any degree of confidence in population trends and therefore it is more tenable to assess it as Vulnerable under the D2 criterion which does appear to be well supported by the available evidence.

Geographic Range [top]

Range Description:Polycyathus isabela is an endemic species for the ETP region, present only around the Galápagos Archipelago. Occurrence known from Punta Albemarle (14 m, holotype); Punta Vicente Roca (10 m), and Caleta Iguana (11 m) at Isabela Island (Wells 1983, Cairns 1991, Reyes-Bonilla 2002, Hickman 2005).
Countries occurrence:
Native:
Ecuador (Galápagos)
FAO Marine Fishing Areas:
Native:
Pacific – southeast
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:P. isabela is an uncommon species (Hickman 2005), only recorded from three sites at Isabela Island (viz. Punta Albemarle, Punta Vicente Roca and Caleta Iguana). The population status of the type subpopulation from Punta Albemarle is unknown, although the species has not been sighted in recent searches in that region.

The subpopulation from Punta Vicente Roca (sighted in 2003), has not been seen subsequently, despite this location having been surveyed seasonally since that time (Chiriboga, Hickamn and Edgar pers. comms.). In addition, another small colony was sighted in 2004 at Caleta Iguana, Isabela during underwater searches (Chiriboga, Hickman and Edgar pers. comms.).
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:In recesses or caves with subdued light (Hickman 2005), reported at depths of 10 to 23 m (Cairns 1991, Hickman 2005).
Systems:Marine

Threats [top]

Major Threat(s): Unknown. Presumably El Niño and climate change.

Conservation Actions [top]

Conservation Actions: Present in one protected area in the ETP region: Galápagos Marine Reserve (IUCN category VI); Galápagos Archipelago Particularly Sensitive Area (PSSA); Galápagos Island World Heritage Site (UNESCO N (i)(ii)(iii)(iv), and Galápagos Island Man and Biosphere Reserve (UNESCO). Included with corals in CITES Appendix II.

Classifications [top]

9. Marine Neritic -> 9.2. Marine Neritic - Subtidal Rock and Rocky Reefs
suitability: Suitable  
1. Land/water protection -> 1.1. Site/area protection
1. Land/water protection -> 1.2. Resource & habitat protection
2. Land/water management -> 2.1. Site/area management

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over entire range
In-Place Species Management
In-Place Education
11. Climate change & severe weather -> 11.3. Temperature extremes
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.8. Other

11. Climate change & severe weather -> 11.5. Other impacts
♦ timing: Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

0. Root -> 100.1. OLD 1.1.1-Policy-base actions->Management plans->Development
1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Cairns, S.D. 1991. A revision of the ahermatypic Scleractinia of the Galápagos and Cocos Islands. Smithsonian Contributions to Zoology 504: 32.

Hickman, C. 2005. A Field Guide to Corals of Galápagos. Sugar Spring Press, Lexington, VA. 52 pp.

IUCN. 2007. 2007 IUCN Red List of Threatened Species. Available at: www.iucnredlist.org. (Accessed: 12th September 2007).

Reyes-Bonilla, H. 2002. Checklist of valid names and synonyms of the stony corals (Anthozoa: Scleractinia) from eastern Pacific. Journal of Natural History 36: 1-13.


Citation: Chiriboga, A., Hickman, C., Edgar, G., Banks, S. & Vera, M. 2007. Polycyathus isabela. In: The IUCN Red List of Threatened Species 2007: e.T63576A12693506. . Downloaded on 28 June 2016.
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