|Scientific Name:||Holacanthus clarionensis Gilbert, 1890|
|Red List Category & Criteria:||Vulnerable D2 ver 3.1|
|Assessor(s):||Pyle, R., Myers, R., Rocha, L.A. & Robertson, R.|
|Reviewer(s):||Elfes, C., Polidoro, B., Livingstone, S. & Carpenter, K.E.|
The vast majority of the species' population occurs at a single location in the Revillagigedo Islands, where it is restricted to reef habitat with an estimated area of occupancy of less than 50 km2. It has previously been collected for the aquarium trade. Regional experts support the plausible threat of the increased duration and frequency of ENSO events that can cause severe and rapid declines for restricted-range, shallow-water species. This species qualifies for Vulnerable under Criterion D2. However, more research is needed on this phenomenon, and this species should be reassessed when new information is available.
|Range Description:||This eastern central Pacific species appears to have a limited distribution. It is primarily found around the Revillagigedo Islands (Mexico), including Clarion Island (Isla Clarión). Occasional vagrants are recorded from the southern tip of Baja California (Mexico), the southeastern Gulf of California (Mexico), and Clipperton Island (overseas possession of France). It is found at depths of 3-30 m.|
Vagrant:France (Clipperton I.)
|FAO Marine Fishing Areas:|
Pacific – eastern central
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is considered abundant at the Revillagigedo Islands where an estimated 99% of the total population is present, and presumed to be stable. According to Robertson and Allen (1996), this fish is considered vagrant at Clipperton Island, with fewer than 20 individuals recorded.|
|Current Population Trend:||Stable|
|Habitat and Ecology:||This species inhabits clear water rocky reefs. Little additional information is currently available on the natural history of this species.|
|Use and Trade:||This species was formerly collected from the Revillagigedo Islands for the aquarium trade (Fenner 1995), however this island group is now included within a marine protected area and collection of fishes is prohibited. Endoh (2007) notes that it is generally not traded as an aquarium fish and is rarely available and expensive.|
This species has a restricted distribution with the majority of the population confined to a reef habitat in a single location (two locations if Clarion is considered separate from the other three islands), and its area of occupancy is estimated to be less than <50 km2. It has previously been collected for the aquarium trade.
In the Eastern Tropical Pacific, severe localized fish species declines have occurred after strong ENSO events that result in shallow waters that are too warm and nutrient poor for extended periods of time (Grove 1985, Edgar et al. 2009). The frequency and duration of ENSO events in this region of the Eastern Tropical Pacific (e.g. the up-welling zone off the coast of Peru, Ecuador, Colombia, Panama and the offshore islands) appears to be increasing (Glynn and Ault 2000, Soto 2001, Chen et al. 2004). Given this species restricted distribution and shallow water habitat, oceanographic environmental changes, such as those associated with future ENSO events, may have detrimental effects on the survival of this species.
This species is almost entirely limited to the Revillagigedo Islands Marine Protected Area with collection of animals prohibited in Mexican waters (Endoh 2007). This species should be carefully monitored, given its restricted range and shallow reef-associated habitat.
|Citation:||Pyle, R., Myers, R., Rocha, L.A. & Robertson, R. 2010. Holacanthus clarionensis. The IUCN Red List of Threatened Species 2010: e.T165861A6151012.Downloaded on 27 April 2018.|