|Scientific Name:||Halophila nipponica|
Halophila japonica Uchimura
|Taxonomic Notes:||Halophila nipponica is a member of the Halophila ovalis complex.|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Assessor(s):||Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C.|
|Reviewer(s):||Livingstone, S., Harwell, H. & Carpenter, K.E.|
Halophila nipponica is recently described and may be the same species as H. ovalis. It is only known from a small number of collections in Japan and Korea. The population is declining overall due to coastal development in a number of areas within the distribution. The area of occupancy (AOO) of this species is close to the threshold for the Vulnerable category of less than 2,000 km² and there is a continuing decline in habitat quality. Therefore this species is listed as Near Threatened.
|Range Description:||Halophila nipponica is found in a few temperate locations in Japan and southern South Korea (Kuo et al. 2006). Given its very shallow depth range, and patchy occurrence, it has an area of occupancy estimated to be close to 2000 km2.|
Native:Japan; Korea, Republic of
|FAO Marine Fishing Areas:||
Pacific – northwest
|Estimated area of occupancy (AOO) - km2:||2000|
|Lower depth limit (metres):||8|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||There is little population information available for this species. It is declining in the industrial and urban areas of its range and therefore the population is likely to be declining overall.|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||This is a temperate species that is found to depths of eight m (Uchimura et al. 2006, 2008).|
|Generation Length (years):||4|
|Major Threat(s):||Major threats for Halophila nipponica are unknown. However in Japan, localized threats may include coastal development, land reclamation, water pollution and trawling (Short et al. 2007). The population is declining overall due to coastal development in a number of areas within the distribution|
There are no known specific conservation measures for H. nipponica.
Research is need on this species on taxonomy, population trends and threats.
IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).
Kuo, J., Kanamoto, Z., Hzumi, H., and Mukai, H. 2006. Seagrasses of the genus Halophilia Thouars (Hydrocharitaceae) from Japan. Acta Phytotaxonomica et Geobotanica 57(2): 129-154.
Short, F.T., Dennison, W.C., Carruthers, T.J.B. and Waycott, M. 2007. Global Seagrass Distribution and Diversity: A Bioregional Model. Journal of Experimental Marine Biology and Ecology 350: 3-20.
Uchimura, M., Faye, E.J., Shimada, S., Arai, S., Inoue, T. and Nakamura, Y. 2006. A re-evaluation of the taxonomic status of Halophila euphlebia Makino (Hydrocharitaceae) based on Morphological features and ITS sequence data. Botanica Marina 49(2): 111-121.
Uchimura, M., Faye, E.J., Shimada, S., Inoue, T. and Nakamura, Y. 2008. A reassessment of Halophlia species (Hydrocharitaceae) diversity with special reference to Japanese representatives. Marine Botany 51: 258-268.
|Citation:||Short, F.T., Carruthers, T.J.R., Waycott, M., Kendrick, G.A., Fourqurean, J.W., Callabine, A., Kenworthy, W.J. & Dennison, W.C. 2010. Halophila nipponica. The IUCN Red List of Threatened Species 2010: e.T173381A7004341. . Downloaded on 04 May 2016.|
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