|Scientific Name:||Chlorurus troschelii (Bleeker, 1853)|
Pseudoscarus rhoduropterus Bleeker, 1861
Pseudoscarus troscheli (Bleeker, 1853)
Scarus troschelii Bleeker, 1853
|Taxonomic Notes:||The status of this species is poorly known. There is a possibility of a related undescribed species in the north central Indian Ocean (J.H. Choat pers comm. 2009). The initial phase has been confused with the initial phase of C. capistratoides and C. bleekeri (Bellwood 2001).
The genera Chlororus and Scarus are two distinct monophyletic lineages (Smith et al. 2008). The sister pair C. bleekeri and C. bowersi share particularly distintive cheek patches of green/white (C. bleekeri) to solid green/blue (C. bowersi), a double chin strap of blue, and nearly identical fin colorations (Smith et al. 2008). C. troschelii is also likely a member of this clade (Choat and Randall 1986).
Westneat and Alfaro (2005) recognize the Scarini as a tribe within the family Labridae.
|Red List Category & Criteria:||Least Concern ver 3.1|
|Assessor(s):||Choat, J.H., Carpenter, K.E., Rocha, L.A., Clements, K.D., Russell, B., Myers, R., Lazuardi, M.E., Muljadi, A., Rahardjo, P. & Pardede, S.|
|Reviewer(s):||McIlwain, J. & Craig, M.T.|
This species is rare over most of its range. It is not targeted by any fishery and occurs in marine reserves. It is therefore listed as Least Concern.
|Previously published Red List assessments:|
|Range Description:||This species is found from west Thailand to western and southern Indonesia to central Java and Cocos Keeling Island.|
Native:Cocos (Keeling) Islands; Indonesia; Malaysia; Thailand
|FAO Marine Fishing Areas:|
Indian Ocean – eastern
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species is apparently rare over most of its range.|
|Current Population Trend:||Unknown|
|Habitat and Ecology:||The maximum size recorded for this species is 40 cm (TL). It is found solitary or in pairs on reef slopes and lagoonal habitats (Bellwood 2001). It occurs in depths from 5-25 m (Lieske and Myers 1994).|
|Use and Trade:||This species is a component of artisanal fisheries.|
There are no major threats known for this species.
Parrotfishes show varying degrees of habitat preference and utilization of coral reef habitats, with some species spending the majority of their life stages on coral reefs, while others primarily utilize seagrass beds, mangroves, algal beds, and /or rocky reefs. Although the majority of the parrotfishes occur in mixed habitat (primarily inhabiting seagrass beds, mangroves, and rocky reefs) approximately 78% of these mixed habitat species are experiencing greater than 30% loss of coral reef area and habitat quality across their distributions. Of those species that occur exclusively in coral reef habitat, more than 80% are experiencing a greater than 30% of coral reef loss and degradation across their distributions. However, more research is needed to understand the long-term effects of habitat loss and degradation on these species populations. Widespread coral reef loss and declining habitat conditions are particularly worrying for species that depend on live coral reefs for food and shelter especially as studies have shown that protection of pristine habitats facilitate the persistence of adult populations in species that have spatially separated adult and juvenile habitats. Furthermore, coral reef loss and declining habitat conditions are particularly worrying for some corallivorous excavating parrotfishes that play major roles in reef dynamics and sedimentation (Comeros-Raynal et al. 2012).
|Conservation Actions:||There are no species-specific conservation measures in place for this species. However, its distribution overlaps several marine protected areas within its range.|
Bellwood, D.R. 2001. Scaridae. Parrotfishes. In: K.E. Carpenter and V. Niem (eds), The living marine resources of the Western Central Pacific. Bony fishes part 4 (Labridae to Latimeridae), estuarine crocodiles, sea turtles, sea snakes, and marine mammals, pp. 3468- 3492. FAO, Rome.
Choat, J.H. and Randall, J.E. 1986. A review of the parrotfishes (family Scaridae) of the Great Barrier Reef of Australia with description of a new species. Records of the Australian Museum 38: 175-228.
Comeros-Raynal, M.T., Choat, J.H., Polidoro, B.A., Clements, K.D., Abesamis, R., Craig, M.T., Lazuardi, M.E., McIlwain, J., Muljadi, A., Myers, R.F., Nañola Jr., C.L., Pardede, S., Rocha, L.A., Russell, B., Sanciangco, J.C., Stockwell, B., Harwell, H. and Carpenter, K.E. 2012. The likelihood of extinction of iconic and dominant components of coral reefs: the parrotfishes and surgeonfishes. PLoS ONE http://dx.plos.org/10.1371/journal.pone.0039825.
IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).
Lieske, E. and Myers, R. 1994. Collins Pocket Guide. Coral reef fishes. Indo-Pacific and Caribbean including the Red Sea. Harper-Collins, London, U.K.
Smith, L.L., Fessler, J.L., Alfaro, M.E., Streelman, J.T. and Westneat, M.W. 2008. Phylogenetic relationships and the evolution of regulatory gene sequences in the parrotfishes. Molecular Phylogenetics and Evolution 49: 136-152.
Westneat, M. W. and Alfaro, M.E. 2005. Phylogenetic relationships and evolutionary history of the reef fish family Labridae. Molecular Phylogenetics and Evolution 36: 370–390.
|Citation:||Choat, J.H., Carpenter, K.E., Rocha, L.A., Clements, K.D., Russell, B., Myers, R., Lazuardi, M.E., Muljadi, A., Rahardjo, P. & Pardede, S. 2012. Chlorurus troschelii. The IUCN Red List of Threatened Species 2012: e.T190741A17787513.Downloaded on 19 July 2018.|
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