Siderastrea siderea

Siderastrea siderea, commonly known as massive starlet coral or round starlet coral, is a stony coral in the family Siderastreidae. It is found in shallow parts of the western Atlantic Ocean as solid boulder-shaped or domed structures.

Massive starlet coral

Least Concern  (IUCN 3.1)
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Anthozoa
Order: Scleractinia
Family: Siderastreidae
Genus: Siderastrea
Species:
S. siderea
Binomial name
Siderastrea siderea
(Ellis & Solander, 1786)[1][2]
Synonyms
  • Siderastrea glynni Budd & Guzman, 1994

Description

Siderastrea siderea is a colonial coral that forms low domes or boulder-shaped structures with a smooth dimpled surface as much as 2 metres (6 ft 7 in) wide on the seabed.[3] It can be encrusting when young.[3] The corallites, the calcareous cup-shaped depressions in which the polyps sit, are about 5 millimetres (0.20 in) wide with about 50 or 60 little ridges called septa.[4] The general colour is reddish brown. This species can be confused with the closely related lesser starlet coral (Siderastrea radians) but that is usually smaller and has deeper, more angular corallites, each with 30 to 40 septa.[3]

Distribution and habitat

Siderastrea siderea is found in the Caribbean Sea and the northern Gulf of Mexico and round the coasts of southern Florida, the Bahamas and Bermuda. It can occur at depths of up to 40 metres (130 ft) but is most common in less than 10 metres (33 ft) of water. It is found on rocks in various reef environments but not in tidal pools or muddy areas.[3]

In the IUCN Red List of Threatened Species, the massive starlet coral is listed as being of "Least Concern". This is because it is common throughout its wide range and its main threat is the destruction of its coral reef habitat. It is moderately susceptible to coral bleaching but is capable of recovering when conditions improve.[5]

Research

Siderastrea siderea is a very slow growing species that lives to a great age. In a study, cores were drilled and samples taken from the coral in different zones in order to determine whether rates of growth had changed over the last hundred years. It was found that for backreef and nearshore specimens, the rates of extension of the skeleton had not changed significantly in this time period. However, the rate of growth for forereef corals had declined dramatically, this zone changing from being the one in which the fastest growth took place to the one with the slowest rates of extension. The reasons for this were not studied but possible causes include increased sedimentation and turbidity of the water, eutrophication or thermal stress.[6] In the Florida Keys, this species showed greater rates of growth (calcification) in the remote Dry Tortugas National Park compared to at other off-shore sites on the Florida reef tract.[7]

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References
  1. van der Land, Jacob (2012). "Siderastrea siderea Ellis & Solander". WoRMS. World Register of Marine Species. Retrieved 2012-07-10.
  2. "Siderastrea siderea (Ellis and Solander, 1786)". ITIS Report. Retrieved 2012-07-10.
  3. Colin, Patrick L. (1978). Marine Invertebrates and Plants of the Living Reef. T.F.H. Publications. p. 235. ISBN 0-86622-875-6.
  4. "Round starlet coral (Siderastrea siderea)". Interactive Guide to Caribbean Diving. Marine Species Identification Portal. Retrieved 2012-07-10.
  5. Aronson, R.; Bruckner, A.; Moore, J.; Precht, B.; Weil, E. (2012). "Siderastrea siderea". IUCN Red List of Threatened Species. Retrieved 2012-07-14.
  6. Castillo, K. D.; Ries, J. B.; Weiss J. M. (2011). "Declining coral skeletal extension for forereef colonies of Siderastrea siderea on the Mesoamerican Barrier Reef system, Southern Belize". PLoS ONE. 6 (2): e14615. doi:10.1371/journal.pone.0014615. PMC 3040180. PMID 21359203.
  7. Kuffner, I. B.; Hickey, T. D.; Morrison, J. M. (2013). "Calcification rates of the massive coral Siderastrea siderea and crustose coralline algae along the Florida Keys (USA) outer-reef tract". Coral Reefs. 32 (4): 987–997. doi:10.1007/s00338-013-1047-8.
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