 |
|
|
Acropora
corals
Acropora sp.
Family Acroporidae
updated Nov 2019
Where
seen? These corals can form delicate colonies that resemble
miniature underwater forests. They are always a delight to encounter.
Sometimes seen on many of our Southern shores, larger colonies are
more commonly seen on undisturbed and remote reefs. The genus Acropora has the largest number of species of all the hard corals. The scientific
name is usually pronounced as 'ah-crop-or-ah'.
Features: Colonies seen
usually 15-20cm, but on undisturbed shores can be 50cm or larger.
Many grow into branching forms that give rise to common names like
'staghorn coral'. For some, the entire colony often has a flat top
so they are sometimes also called 'table-top' or 'table coral'. Others
appear bushy. Branches are generally cylindrical with corallites appearing
all around the branch.
Corallite tiny (0.5cm) smooth cups or tubes. Acropora corals have
a distinctive corallite, usually at the tip of the branch, that is
larger than the other corallites. This is called an axial corallite.
New corallites (called secondary or radial corallites) bud off along
the sides while the axial corallite continues to grow upwards on the
tip of the branch. The axial corallite lacks zooxanthellae but grows
rapidly as it is fed by other areas of the colony. The tips are often
white or brightly coloured.
Polyps tiny (0.2-0.5cm), with long tapering tentacles. When fully
extended, the colony can appear 'furry'.
Sometimes mistaken for branching pocilloporid corals (Family Pocilloporidae).
There are probably several different species on these pages. It's
hard to distinguish them without close examination of small features.
On this website, they are grouped by large external features for convenience
of display.
As a group, acropora corals are adaptable and found in a wide range
of habitats from murky waters to wave-pounded areas and some can survive
regular exposure at low tide. These protect themselves with a thick
mucus coat and UV-absorbing substances. They come in a wide variety
of colours.
Some acropora corals are rather delicate and will shatter if they
are knocked against. So please do not touch them, in fact, we should
not touch any living hard corals. |

Some acropora coral form table-like colonies.
Raffles Lighthouse, Jun 07 |

Corallites with tentacles
contracted.
Sisters Island, Dec 05 |

With the tentacles extended,
the colony can appear 'furry'.
Pulau Semakau, Apr 08 |
Role in the habitat: Acropora
corals are among the important building blocks of a reef. Together
with Montipora species, also members of the Family Acroporidae,
acropora corals account for one-third of reef-building coral species.
Acropora corals include some of the fastest growing hard corals. Their
branching forms provide shelter to a wide variety of animals, from
small fishes to tiny clams, small crabs to shrimps. |

Producing mucus to protect themselves.
Pulau Semakau, Mar 05 |

The coral turns pink when stressed.
Pulau Semakau, Feb 19 |

Coral
scallop
Sisters Island, May 08 |
Human uses: Acropora corals are
popular in the live aquarium trade and wild colonies are often taken
from the natural reefs to supply this demand. Efforts to breed and
raise acropora corals have been successful and it is hoped this supply
will reduce collection from the wild. Although captive bred acropora
corals are healthier and easier to care for than wild collected specimens,
captive bred corals are more expensive.
Status: While a few species are listed as Endangered and Vulnerable, for most there is inadequate information as at 2024 to make an informed assesment of the conservation status of the recorded Acropora corals in Singapore. |
Some Acropora corals on Singapore shores |
 |
Acropora
species recorded for Singapore
from Checklist of Cnidaria (non-Sclerectinia) Species with their Category of Threat Status for Singapore by Yap Wei Liang Nicholas, Oh Ren Min, Iffah Iesa in G.W.H. Davidson, J.W.M. Gan, D. Huang, W.S. Hwang, S.K.Y. Lum, D.C.J. Yeo, May 2024. The Singapore Red Data Book: Threatened plants and animals of Singapore. 3rd edition. National Parks Board. 663 pp.
in red are those listed as threatened
in the above.
|
Acropora
corals seen awaiting identification
Species
are difficult to positively identify without close examination
with a microscope. On this website,
they are grouped by external features for convenience of display. |
|
Acropora abrotanoides
Acropora aculeus (Bottlebrush coral)
Acropora acuminata (VU Vulnerable)
Acropora anthocercis (VU Vulnerable)
Acropora aspera (EN Endangered) (Green staghorn coral)
Acropora austera
Acropora cerealis
Acropora chesterfieldensis
Acropora cytherea (Table coral)
Acropora digitifera (EN Endangered) (Staghorn coral)
Acropora divaricata
Acropora donei (Purple-tipped acropora)
Acropora elseyi (Bottlebrush coral)
Acropora florida
Acropora glauca
Acropora grandis (Brook, 1892) Not Listed DD
Acropora granulosa (Tubular table coral)
Acropora horrida (Blue staghorn coral)
Acropora humilis (Finger coral)
Acropora hyacinthus (Brush coral)
Acropora intermedia
Acropora latistella
Acropora longicyathus
Acropora loripes (Blue tip coral)
Acropora lutkeni
Acropora microclados
Acropora microphthalma (Small staghorn coral)
Acropora millepora (EN Endangered) (Plate acropora coral)
Acropora muricata (Staghorn coral)
Acropora nana
Acropora nasuta (EN Endangered) (Branching staghorn coral)
Acropora palmerae
Acropora polystoma
Acropora pulchra
Acropora robusta
Acropora samoensis
Acropora secale
Acropora selago
Acropora solitaryensis
Acropora spicifera (EN Endangered)
Acropora subglabra (EN Endangered)
Acropora subulata
Acropora tenuis
Acropora valenciennesi
Acropora valida
Acropora verweyi
Acropora willisae |
|
Links
References
- Checklist of Cnidaria (non-Sclerectinia) Species with their Category of Threat Status for Singapore by Yap Wei Liang Nicholas, Oh Ren Min, Iffah Iesa in G.W.H. Davidson, J.W.M. Gan, D. Huang, W.S. Hwang, S.K.Y. Lum, D.C.J. Yeo, May 2024. The Singapore Red Data Book: Threatened plants and animals of Singapore. 3rd edition. National Parks Board. 663 pp.
- Danwei Huang,
Karenne P. P. Tun, L. M Chou and Peter A. Todd. 30 Dec 2009. An
inventory of zooxanthellate sclerectinian corals in Singapore
including 33 new records (pdf). Raffles Bulletin of Zoology
Supplement No. 22: 69-80.
- Veron, Jen.
2000. Corals
of the World
Australian Institute of Marine Science, Australia. 3 volumes.
- Chou, L.
M., 1998. A
Guide to the Coral Reef Life of Singapore. Singapore Science
Centre. 128 pages.
- Erhardt,
Harry and Daniel Knop. 2005. Corals:
Indo-Pacific Field Guide
IKAN-Unterwasserachiv, Frankfurt. 305 pp.
- Borneman,
Eric H. 2001. Aquarium
Corals: Selection, Husbandry and Natural History
T.F. H Publications. 464 pp
- Wee Y.C.
and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore.
National Council on the Environment. 163pp.
- Davison,
G.W. H. and P. K. L. Ng and Ho Hua Chew, 2008. The Singapore
Red Data Book: Threatened plants and animals of Singapore.
Nature Society (Singapore). 285 pp.
|
|
|