|Scientific Name:||Porites sverdrupi|
|Species Authority:||Durham, 1947|
|Taxonomic Notes:||May be a synonym of P. panamensis.|
|Red List Category & Criteria:||Vulnerable A4ce ver 3.1|
|Assessor(s):||Chiriboga, A., Edgar, G. & Reyes-Bonilla, H.|
|Reviewer(s):||Livingstone, S., Polidoro, B. & Smith, J. (Global Marine Species Assessment)|
This species is rare within its restricted range. It is particularly susceptible to disease may be harvested for the aquarium trade, and extensive reduction of coral reef habitat due to a combination of threats. Specific population trends are unknown, but population reduction can be inferred from declines in habitat quality based on the combined estimates of both destroyed reefs and reefs at the critical stage of degradation within its range (Wilkinson 2004). Its threat susceptibility increases the likelihood of being lost within one generation in the future from reefs at a critical stage. Therefore, the estimated habitat degradation and loss of 34% over three generation lengths (30 years) is the best inference of population reduction and meets the threshold for Vulnerable under Criterion A4ce. It will be important to reassess this species in 10 years time because of predicted threats from climate change and ocean acidification.
Porites sverdrupi is endemic to the Eastern Tropical Pacific region, and is only known from Mexico, where it has been reported from Baja California, Baja California Sur, Sinaloa, Nayarit and Jalisco (Reyes-Bonilla 2002, Reyes-Bonilla et al. 2005, Pérez-Vivar et al. 2006, Reyes-Bonilla and López-Pérez 1998, López-Pérez et al. 2003, Glynn and Ault 2000).
Fossil records from the Pliocene and Pleistocene indicate a wider historical distribution to the south as far as the Marias Islands (Reyes-Bonilla 2003, Reyes-Bonilla and López-Pérez 1998, López-Pérez et al. 2003).
|FAO Marine Fishing Areas:||
Pacific – eastern central
|Lower depth limit (metres):||40|
|Upper depth limit (metres):||1|
|Range Map:||Click here to open the map viewer and explore range.|
Porites sverdrupi is considered a rare species throughout its current range (Reyes-Bonilla 2003). In the early 1980s, Reyes-Bonilla (1992) reported this species at Cabo San Lucas but the local populations have since become extinct (López-Pérez et al. 2003). Nevertheless, new live populations have been reported recently from Loreto (Baja California Sur) and from Bahia de Banderas (Jalisco) (Reyes-Bonilla pers comm.). In general, this species distribution has contracted since the 1980s.
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 particularly susceptible to bleaching, disease, and other threats and therefore population decline is based on both the percentage of destroyed reefs and critical reefs that are likely to be destroyed within 20 years (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 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. See the Supplementary Material for further details on population decline and generation length estimates.
|Current Population Trend:||Unknown|
|Habitat and Ecology:||This species occurs at depths of 1 to 40 m, but is most common in deeper water (>20 m) (Reyes-Bonilla et al. 2005, López-Pérez et al. 2003).|
Porites species are heavily collected for the aquarium trade.
The unbranching species in this 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.
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.
|Citation:||Chiriboga, A., Edgar, G. & Reyes-Bonilla, H. 2008. Porites sverdrupi. The IUCN Red List of Threatened Species 2008: e.T133512A3781140. . Downloaded on 30 November 2015.|
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