This species is found in shallow reef environments. It is a common coral in the Indo-Pacific, which is especially successful in shallow reef areas. Branched colonies often form large tracts along the reef front, while massive and encrusting species thrive at more exposed sites. (Wood 1983). P. rus is commonly found from 1 to 11 m, rarely from 12 to 20 m, in the South China Sea and Gulf of Siam (Titlyanov and Titlyanova 2002).

At Sámara, Costa Rica, P. rus was found on exposed rocky outcrops (Cortés pers. comm.).

TTTGGGATTGGGGCAGGTATGCTCGGTACAGCTTTC---AGTATGTTAATAAGATTAGAGCTCTCGGCTCCGGGGGCTATGTTAGGAGAC---GATCATCTTTATAATGTAATTGTTACAGCACACGCTTTTATTATGATCTTTTTTTTGGTTATGCCAGTGATGATAGGGGGATTTGGGAATTGGTTGGTTCCATTA---TATATTGGGGCACCTGATATGGCTTTCCCACGGCTTAATAACATTAGTTTTTGGCTGTTGCCCCCTGCTTTAATATTGTTATTAGGTTCTGCTTTTGTTGAACAAGGGGCGGGTACCGGATGAACGGTTTATCCTCCTCTATCTAGCATTCAGGCCCATTCTGGTGGGGCGGTGGATATG---GCTATTTTTAGTCTCCATTTAGCTGGGGTGTCCTCGATTTTGGGTGCAATGAATTTTATAACAACTATATTTAATATGAGGGCCCCTGGGCTAACGTTGAATAGAATGCCCTTATTTGTGTGGTCTATCTTGATCACTGCTTTTTTATTATTATTGTCTTTGCCCGTATTAGCGGGG---GCCATAACCATGCTTTTAACGGACAGAAACTTTAATACTACTTTCTTTGATCCTGCAGGGGGAGGAGATCCGATTTTATTTCAA
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Red List Category

Red List Criteria

Year Assessed

Assessor/s

Reviewer/s

Contributor/s

This species is common in the Indo-Pacific portion of its range, and may be a dominant species in a wide range of habitats. In a study of 11 areas in the Philippines, three in Malaysia, two in Indonesia, and one each in Madagascar, Rodrigues, Andamans, Papua New Guinea, Australia, New Caledonia, Fiji, American Samoa and Hawaii, the species was present at 79% of the sites surveyed (Fenner pers. comm.).

In the Eastern Tropical Pacific region, P. rus is possibly extinct.

There is no species specific population information available for this species. However, there is evidence that overall coral reef habitat has declined, and this is used as a proxy for population decline for this species. This species is more resilient to some of the threats faced by corals and therefore population decline is estimated using the percentage of destroyed reefs only (Wilkinson 2004). We assume that most, if not all, mature individuals will be removed from a destroyed reef and that on average, the number of individuals on reefs are equal across its range and proportional to the percentage of destroyed reefs. Reef losses throughout the species' range have been estimated over three generations, two in the past and one projected into the future.

The age of first maturity of most reef building corals is typically three to eight years (Wallace 1999) and therefore we assume that average age of mature individuals is greater than eight years. Furthermore, based on average sizes and growth rates, we assume that average generation length is 10 years, unless otherwise stated. Total longevity is not known, but likely to be more than ten years. Therefore any population decline rates for the Red List assessment are measured over at least 30 years. Follow the link below for further details on population decline and generation length estimates.

Unknown

Porites species are heavily collected for the aquarium trade. In Indonesia, the catch quota for this genus is 55,500 per year.

The genus is not particularly susceptible to bleaching, but is more prone to disease than many other corals. Coral disease has emerged as a serious threat to coral reefs worldwide and is a major cause of reef deterioration (Weil et al. 2006). The numbers of diseases and coral species affected, as well as the distribution of diseases have all increased dramatically within the last decade (Porter et al. 2001, Green and Bruckner 2000, Sutherland et al. 2004, Weil 2004). Coral disease epizootics have resulted in significant losses of coral cover and were implicated in the dramatic decline of acroporids in the Florida Keys (Aronson and Precht 2001, Porter et al. 2001, Patterson et al. 2002). In the Indo-Pacific, disease is also on the rise with disease outbreaks recently reported from the Great Barrier Reef (Willis et al. 2004), Marshall Islands (Jacobson 2006) and the northwestern Hawaiian Islands (Aeby 2006). Increased coral disease levels on the Great Barrier Reef were correlated with increased ocean temperatures (Willis et al. 2007) supporting the prediction that disease levels will be increasing with higher sea surface temperatures. Escalating anthropogenic stressors combined with the threats associated with global climate change of increases in coral disease, frequency and duration of coral bleaching and ocean acidification place coral reefs in the Indo-Pacific at high risk of collapse.

In general, the major threat to corals is global climate change, in particular, temperature extremes leading to bleaching and increased susceptibility to disease, increased severity of ENSO events and storms, and ocean acidification. In addition to global climate change, corals are also threatened by a number of localized threats. Localized threats to corals include fisheries, human development (industry, settlement, tourism, and transportation), changes in native species dynamics (competitors, predators, pathogens and parasites), invasive species (competitors, predators, pathogens and parasites), dynamite fishing, chemical fishing, pollution from agriculture and industry, domestic pollution, sedimentation, and human recreation and tourism activities. The severity of these combined threats to the global population of each individual species is not known.

All corals are listed on CITES Appendix II. Parts of this species distribution fall within several Marine Protected Areas within its range.

Recommended measures for conserving this species include research in taxonomy, population, abundance and trends, ecology and habitat status, threats and resilience to threats, restoration action; identification, establishment and management of new protected areas; expansion of protected areas; recovery management; and disease, pathogen and parasite management. Artificial propagation and techniques such as cryo-preservation of gametes may become important for conserving coral biodiversity.

Having timely access to national-level trade data for CITES analysis reports would be valuable for monitoring trends this species. The species is targeted by collectors for the aquarium trade and fisheries management is required for the species, e.g., Marine Protected Areas, quotas, size limits, etc. Consideration of the suitability of species for aquaria should also be included as part of fisheries management, and population surveys should be carried out to monitor the effects of harvesting.