Galapagos coral (Polycyathus isabela)

loading
Galapagos coral, Polycyathus isabela, in situ
loading
Loading more images and videos...

Galapagos coral fact file

Galapagos coral description

KingdomAnimalia
PhylumCnidaria
ClassAnthozoa
OrderScleractinia
FamilyCaryophylliidae
GenusPolycyathus (1)

A rare coral found only around the islands after which it is named, Polycyathus isabela generally forms low colonies in which the individual corallites are joined together (3). Corals of the Caryophylliidae family are usually pale in colour, and as this species is a rather small and cryptic coral, it is easily overlooked (3).

Top

Galapagos coral biology

Polycyathus isabela is an azooxanthellate coral, meaning that this species does not have zooxanthellae, the algae that live inside the tissues of some corals and provide the coral with food (4). Corals without zooxanthellae instead feed on zooplankton, capturing these tiny aquatic animals in their outstretched tentacles (5).

Top

Galapagos coral range

Currently, Polycyathus isabela is known from only three sites around the island of Isabela, in the Galápagos Archipelago (1).

See this species on Google Earth.

Top

Galapagos coral habitat

Polycyathus isabela can be found in dimly-lit caves and recesses, at depths between 10 and 23 metres (1).

Top

Galapagos coral status

Classified as Vulnerable (VU) on the IUCN Red List (1) and listed on Appendix II of CITES (2).

IUCN Red List species status – Vulnerable

Top

Galapagos coral threats

As Polycyathus isabela has only been recorded from three sites (1), the rarity of this species is of some concern. The small population and range size of this coral makes it incredibly vulnerable to any threats that may arise. Whilst it is not clear whether Polycyathus isabela currently does face any threats, it is assumed that both El Niño and climate change could have detrimental effects on this coral (1).

Top

Galapagos coral conservation

The unique biodiversity of the Galápagos Islands and the surrounding waters is recognised and valued, and thus the region is protected by being designated a Marine Reserve and World Heritage Site (1). Polycyathus isabela is also included in Appendix II of the Convention on International Trade in Endangered Species (CITES), meaning that any international trade in this species should be carefully regulated (2). Unfortunately, neither of these measures protects this Vulnerable coral from the threats of natural, or man-induced, climate change.

View information on this species at the UNEP World Conservation Monitoring Centre.
Top

Find out more

For further information on conservation in the Galápagos see:

Top

Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
Top

Glossary

Algae
Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
Colonies
Relating to corals: corals composed of numerous genetically identical individuals (also referred to as zooids or polyps), which are produced by budding and remain physiologically connected.
Corallites
The skeletons of individual polyps. Polpys are the soft-bodied components of corals; each polyp comprises a trunk that is fixed at the base, and a mouth that is placed at the opposite end of the trunk and is surrounded by tentacles.
El Niño
A natural phenomenon that happens every 4 to 12 years, and lasts for several months, when upwelling of cold, nutrient-rich water does not occur. This causes the warming of ocean surface water off the western coast of South America and causes die-offs of plankton and fish. It also affects Pacific jet stream winds, altering storm tracks and creating unusual weather patterns in various parts of the world.
Zooplankton
Tiny aquatic animals that drift with currents or swim weakly in water.
Top

References

  1. IUCN Red List (September, 2007)
    http://www.iucnredlist.org
  2. CITES (July, 2008)
    http://www.cites.org
  3. Wood, E.M. (1983) Corals of the World. TFH Publications, New Jersey.
  4. Veron, J. (2000) Corals of the World. Australian Institute of Marine Science, Townsville, Australia.
  5. Barnes, R.D. (1987) Invertebrate Zoology. Fifth Edition. Saunders College Publishing, US.
X
Close

Image credit

Galapagos coral, Polycyathus isabela, in situ  
Galapagos coral, Polycyathus isabela, in situ

© Cleveland P. Hickman Jr

Cleveland Hickman
Lexington, VA
United States of America
hickman.c@rockbridge.net

X
Close

Link to this photo

ARKive species - Galapagos coral (Polycyathus isabela) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

Help us share the wonders of the natural world. Donate today!

Blog RSS