|Scientific Name:||Aegialitis rotundifolia|
|Red List Category & Criteria:||Near Threatened ver 3.1|
|Assessor(s):||Ellison, J., Koedam, N.E., Wang, Y., Primavera, J., Jin Eong, O., Wan-Hong Yong, J. & Ngoc Nam, V.|
|Reviewer(s):||Polidoro, B.A., Livingstone, S.R. & Carpenter, K.E. (Global Marine Species Assessment Coordinating Team)|
This species has a very restricted and patchy distribution compared to other species of mangroves within its range. It is considered rare when found, and has an estimated area of occupancy of less than 2,000 km². There is a continuing decline in the area and quality of habitat within its distribution due to extensive coastal development, extraction, and the clearing of mangrove areas for agriculture and aquaculture. It is listed as Near Threatened.
|Range Description:||This species has a very restricted and patchy range in Bangladesh, India (mainly found in the Sundarbans where they are common, and Andra Pradesh, Andamans and Nicolbar where they are rare), Myanmar, Thailand, and a in a single location in northern Sumatra, Indonesia. It is estimated that its total area of occupancy is less than 2,000 km².|
Native:Bangladesh; India; Indonesia; Myanmar; Thailand
|FAO Marine Fishing Areas:||
Indian Ocean – eastern
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species ranges from common to rare, and has a very patchy distribution. Although there is no species specific population information, it can be assumed that there are areas of population decline throughout its range due to coastal development.|
|Habitat and Ecology:||This species is found in the downstream estuarine zone in the mid to high intertidal region. This is a small shrub less of than two metres.|
Although local estimates are uncertain due to differing legislative definitions of what is a 'mangrove' and to the imprecision in determining mangrove area, current consensus estimates of mangrove loss in the last quarter-century report an approximately 24% decline in mangrove areas in countries within this species range since 1980 (FAO 2007).
All mangrove ecosystems occur within mean sea level and high tidal elevations, and have distinct species zonations that are controlled by the elevation of the substrate relative to mean sea level. This is because of associated variation in frequency of elevation, salinity and wave action (Duke et al. 1998). With rise in sea-level, the habitat requirements of each species will be disrupted, and species zones will suffer mortality at their present locations and re-establish at higher elevations in areas that were previously landward zones (Ellison 2005). If sea-level rise is a continued trend over this century, then there will be continued mortality and re-establishment of species zones. However, species that are easily dispersed and fast growing/fast producing will cope better than those which are slower growing and slower to reproduce.
In addition, mangrove area is declining globally due to a number of localized threats. The main threat is habitat destruction and removal of mangrove areas. Reasons for removal include cleared for shrimp farms, agriculture, fish ponds, rice production and salt pans, and for the development of urban and industrial areas, road construction, coconut plantations, ports, airports, and tourist resorts. Other threats include pollution from sewage effluents, solid wastes, siltation, oil, and agricultural and urban runoff. Climate change is also thought to be a threat, particularly at the edges of a species range. Natural threats include cyclones, hurricane and tsunamis.
|Conservation Actions:||There are no conservation measures specific to this species, but its range may include some marine and coastal protected areas. Continued monitoring and research is recommended, as well as the inclusion of mangrove areas in marine and coastal protected areas.|
|Citation:||Ellison, J., Koedam, N.E., Wang, Y., Primavera, J., Jin Eong, O., Wan-Hong Yong, J. & Ngoc Nam, V. 2010. Aegialitis rotundifolia. The IUCN Red List of Threatened Species. Version 2015.2. <www.iucnredlist.org>. Downloaded on 05 July 2015.|
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