|Scientific Name:||Centropyge nahackyi|
|Species Authority:||Kosaki, 1989|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Assessor/s:||Pyle, R., Myers, R. & Craig, M.T.|
|Reviewer/s:||Elfes, C., Polidoro, B., Livingstone, S. & Carpenter, K.E.|
This is a common species throughout its limited range (Johnston Atoll), which lies within the Pacific Remote Islands Marine National Monument, and there are no known current threats. However, 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 in this region of the central Pacific. Because it is found in deeper water and therefore is not expected to decline as quickly as more shallow-water species, it is listed as Near Threatened under Criterion D2.
|Range Description:||This species is found at Johnston Atoll in the central Pacific; a single specimen was collected in the Hawaiian Islands (Kosaki 1989, R. Kosaki pers. comm. 2009). It is found at depths of 25-75 m.|
Native:United States (Hawaiian Is.); United States Minor Outlying Islands (Johnston I.)
|FAO Marine Fishing Areas:||
Pacific – eastern central
|Range Map:||Click here to open the map viewer and explore range.|
Little is known about the population status of this species, however it is common at Johnston Atoll and is believed to have stable populations within its limited range (G.R. Allen pers. comm. 2006, M. Craig pers comm. 2009, R. Kosaki pers. comm. 2009).
|Habitat and Ecology:||This species inhabits deep outer coral and rocky reef slopes, and is usually found on rubble substrates (Kosaki 1989).|
This species has a highly restricted distribution with the entirety of its population confined to reef habitat in the Johnston Atoll, with a limited area of occupancy.
In the 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 appears to be increasing (Glynn and Ault 2000, Soto 2001, Chen et al. 2004). Given this species restricted distribution oceanographic environmental changes, such as those associated with future ENSO events, may have detrimental effects on the survival of this species. However, this species is found in deeper waters and declines for this species may not be as severe as for other more shallow-water species.
There are no species specific conservation measures in place, however it almost entirely occurs at Johnston Atoll which is within the Pacific Remote Islands Marine National Monument. Additional research into the biology and natural history of this species is needed to better determine its vulnerability to possible stochastic threats (e.g., ocean warming events).
|Citation:||Pyle, R., Myers, R. & Craig, M.T. 2010. Centropyge nahackyi. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 14 March 2014.|
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