Pavona coral (Pavona cactus)

loading
Pavona cactus colony on crest of reef
loading
Loading more images and videos...

Pavona coral fact file

Pavona coral description

KingdomAnimalia
PhylumCnidaria
ClassAnthozoa
OrderScleractinia
FamilyAgariciidae
GenusPavona (1)

Pavona cactus is a scleractinian coral, meaning that it is a ‘hard’ coral with a limestone skeleton (3). It is pale brown or greenish-brown in colour and typically has thin, upright fronds and twisted branches (4) (5), but may develop thicker fronds when growing in shallow areas with strong waves (4). Pavona cactus may grow as an isolated colony or may form large colonies that can cover over ten metres (4) (5). Until very recently it was thought to be the same species as the cactus coral (Pavona decussata), but studies have now shown that Pavona decussata and Pavona cactus are in fact two distinct species (4)

Top

Pavona coral biology

On the Great Barrier Reef Pavona cactus has been shown to reproduce sexually, although this species also reproduces asexually. It does so by fragmentation (8), a form of asexual reproduction where a new organism grows from a fragment of the parent into a mature, fully grown individual. However, more work is needed on this species’ biology as little information is available at present.

In common with many other corals, Pavona cactus has microscopic algae (zooxanthellae) living within its tissues. Through photosynthesis, these symbiotic algae produce energy-rich molecules that the coral can use as nutrition. In return, the coral provides the zooxanthellae with protection and access to sunlight (9) (10)

Top

Pavona coral range

Pavona cactus is an Indo-Pacific coral, with a range that extends from Japan to Australia and from the Red Sea to Tahiti (6).

Top

Pavona coral habitat

This coral occurs in lagoons and on the upper slopes of reefs (5) (7), where there is a slight current (7), as well as turbid waters protected from waves (5). It is often found growing amid colonies of the cactus coral Pavona decussata (4).

Top

Pavona 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

Pavona coral threats

Pavona cactus is facing a number of threats, including rising water temperatures due to climate change, resulting in coral bleaching. During coral bleaching, the symbiotic algae are expelled, leaving the corals weak and vulnerable to an increasing variety of harmful diseases. This is a threat faced by all corals, although it has been observed that Pavona cactus is less susceptible to bleaching effects than some other coral species (11).

Another problem facing Pavona cactus is the increasing amount of carbon dioxide in the atmosphere. Because Pavona cactus and other scleractiniancorals grow through building their calcified skeleton, the increase of carbon dioxide in the atmosphere reduces the carbonate ions available for the corals to use, thus limiting their growth(12).

Top

Pavona coral conservation

Now that Pavona cactus has been confirmed as a species in its own right, further research into its biology will help inform future conservation actions for this species. Sadly, on a larger scale, it has been deemed that the environmental threats caused by climate change may already be too severe for most corals. A meeting in October 2009 saw scientists discuss the ambitious idea of freezing coral in liquid nitrogen so as to preserve them for reintroduction when the global climate has stabilized (13).

View information on this species at the UNEP World Conservation Monitoring Centre.
Environment Agency - Abu Dhabi is a principal sponsor of ARKive. EAD is working to protect and conserve the environment as well as promoting sustainable development in the Emirate of Abu Dhabi.
Top

Find out more

For further information on the conservation of coral reefs 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

This species information was authored as part of the ARKive and Universities Scheme.
Top

Glossary

Algae
Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
Asexually
Relating to asexual reproduction: reproduction that does not involve the formation of sex cells, such as sperm and eggs. Asexual reproduction only involves one parent, and all the offspring produced by asexual reproduction are identical to one another.
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.
Photosynthesis
Metabolic process characteristic of plants in which carbon dioxide is broken down, using energy from sunlight absorbed by the green pigment chlorophyll. Organic compounds are made and oxygen is given off as a by-product.
Sexually
Relating to sexual reproduction: a form of reproduction that involves fertilization of a female cell or egg, by a male sperm. It usually involves two parents, one of either sex, but in some species individuals are hermaphrodite (possess both male and female sex organs).
Symbiotic
Describes a relationship in which two organisms form a close association. The term is now usually used only for associations that benefit both organisms (a mutualism).
Top

References

  1. IUCN Red List (March, 2010)
    http://www.iucnredlist.org
  2. CITES (March, 2010)
    http://www.cites.org
  3. Willis, B.L. and Ayre, D.J. (1985) Asexual reproduction and genetic determination of growth form in the coral Pavona cactus: biochemical, genetic and immunogenic evidence. Oecologia, 65: 516-525.
  4. Pillay, K. Asahida, T. Chen, C. Terashima, H. and Ida, H. (2006) ITS ribosomal DNA distinctions and the genetic structures of populations of two sympatric species of Pavona (Cnidaria: Sceleractina) from Mauritius. Zoological Studies, 45(1): 132-144.
  5. Veron, J.E.N. (1986) Corals of Australia and the Indo-Pacific. Australian Institute of Marine Science, Townsville, Australia.
  6. Sea Life Base (November, 2009)
    http://www.sealifebase.org/summary/SpeciesSummary.php?id=46104
  7. Erhardt, H. and Moosleitner, H. (1998) Marine Atlas, Volume 2: The Joint Aquarium Care of Invertebrates. Mergus, Melle, Germany. 
  8. Ayre, D.J. and Wills, B.L. (1988) Population structure in the coral Pavona cactus: clonal genotypes show little phenotypic plasticity. Marine Biology, 99: 495-505.
  9. Barnes, R.D. (1987) Invertebrate Zoology. Fifth Edition. Saunders College Publishing, U.S.
  10. Veron, J.E.N. (2000) Corals of the World. Australian Institute of Marine Sciences, Townsville, Australia.
  11. Craig, P., Birkeland, C. and Belliveau, S. (2001) High temperatures tolerated by a diverse assemblage of shallow-water corals in American Samoa. Coral Reefs, 20: 185-189.
  12. Marubini, F., Ferrier-Pages, C. and Cuif, J.P. (2003) Suppression of skeletal growth in scleractinian corals by decreasing ambient carbonate-ion concentration: a cross-family comparison. Proceedings of the Royal Society, 270: 179-184.
  13. McGrath, M. (2009) Freezer Plan to Save Coral. BBC News, Online. Available at:
    http://news.bbc.co.uk/1/hi/8324954.stm
X
Close

Image credit

Pavona cactus colony on crest of reef  
Pavona cactus colony on crest of reef

© Franco Banfi / SeaPics.com

SeaPics.com
SeaPics.com Inc.
77-6344 Halawai Place
Kailua Kona
HI
96740
USA
info@seapics.com
http://www.seapics.com

X
Close

Link to this photo

ARKive species - Pavona coral (Pavona cactus) 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 »

This species is featured in:

This species is featured in Jewels of the UAE, which showcases biodiversity found in the United Arab Emirates in association with the Environment Agency – Abu Dhabi.

This species is featured in:

This species is affected by global climate change. To learn about climate change and the species that are affected, visit our climate change pages.

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

Blog