Crown-of-thorns starfish

Contents

Crown-of-thorns starfish is a large, multirayed Echinodermata predator native to tropical Coral Sea and Indo-Pacific reefs. It is notable for populations that periodically increase and cause widespread coral bleaching-like loss by consuming scleractinia corals, provoking management in regions such as the Great Barrier Reef and the Red Sea. Researchers from institutions like the Australian Institute of Marine Science, the Smithsonian Institution, and the University of Queensland have studied its biology, impacts, and control.

Taxonomy and Description

The species Acanthaster planci was described during the era of explorers such as James Cook and taxonomists influenced by works from Carolus Linnaeus and contemporaries in the 18th century. Morphologically it exhibits a central disc and up to 21 arms, covered in venomous spines similar to defensive structures discussed in literature from the Royal Society and exhibited in collections at the Natural History Museum, London and the National Museum of Natural History (France). Comparative anatomy has been examined alongside taxa in collections at the American Museum of Natural History, with genetic analyses published by teams affiliated with the Max Planck Society and the University of Tokyo clarifying phylogenetic placement within Acanthasteridae. Descriptive work references methods used by the International Commission on Zoological Nomenclature.

Its range spans reefs from the Red Sea and East Africa across the Indian Ocean to the western and central Pacific Ocean, including the Great Barrier Reef, Fiji, Papua New Guinea, Hawaii, and French Polynesia. Occurrence records are held by agencies such as the Global Biodiversity Information Facility and monitored by programs like the Coral Reef Watch operated by NOAA. Habitat preferences include lagoonal and fore-reef slopes where Acropora and other scleractinia genera form reef frameworks, with depth records comparable to surveys by the Australian Museum and diving expeditions using protocols from the Scientific Committee on Antarctic Research for benthic studies.

Reproductive patterns include broadcast spawning documented in seasonal studies overseen by researchers at James Cook University and the University of Hawaii at Manoa. Larval development proceeds through planktonic stages analogous to protocols used in plankton studies at the Scripps Institution of Oceanography and settlement research by the Woods Hole Oceanographic Institution. Fecundity estimates reported in papers from the Australian Institute of Marine Science and the Smithsonian Tropical Research Institute show high gamete output, while larval survival links to nutrient and oceanographic conditions monitored by Plymouth Marine Laboratory and the CSIRO.

As an obligate corallivore, it consumes large quantities of stony coral tissue, preferring fast-growing genera such as Acropora and Montipora, a behavior described in ecological syntheses published by the International Coral Reef Initiative and journals affiliated with the Royal Society of London. Its feeding scars have been quantified in long-term monitoring by the Great Barrier Reef Marine Park Authority and comparative studies from the University of the South Pacific. Predatory interactions and putative predators such as species studied by the Zoological Society of London and reports from the Fisheries Research Agency (Japan) have included observations involving reef fishes and large invertebrates catalogued in the World Register of Marine Species.

Outbreak phenomena have been recorded during surveys by the Great Barrier Reef Marine Park Authority, historical expeditions like those of the HMS Challenger, and long-term monitoring programs coordinated by the United Nations Environment Programme and World Wildlife Fund. Outbreaks correlate with drivers investigated by teams at the Australian Institute of Marine Science, James Cook University, and the University of Western Australia, including changes linked to coastal runoff events documented by the Queensland Government and oceanographic anomalies tracked by NOAA and the Intergovernmental Panel on Climate Change. Ecological consequences include loss of coral cover documented in datasets curated by the International Coral Reef Society and modeled in studies supported by the European Union research frameworks.

Management responses include manual removal campaigns organized by agencies such as the Great Barrier Reef Marine Park Authority and community programs supported by the Australian Government and local stakeholders like the Townsville City Council. Biological control research has engaged institutions including the University of Tokyo and the Smithsonian Institution, while injection techniques using solutions trialed by teams at the Australian Institute of Marine Science have been deployed in collaboration with NGOs like the Wildlife Conservation Society. Monitoring frameworks rely on protocols from the Global Coral Reef Monitoring Network and policy instruments informed by reviews from the Commonwealth Scientific and Industrial Research Organisation and international conservation bodies such as IUCN.