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Zostera caespitosa

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_onStatus_en_offStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA LILIOPSIDA NAJADALES ZOSTERACEAE

Scientific Name: Zostera caespitosa
Species Authority: Miki
Common Name/s:
English Species code: Zs

Assessment Information [top]

Red List Category & Criteria: Vulnerable B2ab(ii,iii) ver 3.1
Year Published: 2010
Date Assessed: 2008-08-11
Assessor/s: Short, F.T. & Waycott, M.
Reviewer/s: Livingstone, S., Harwell, H. & Carpenter, K.E.
Justification:
Zostera caespitosa is found on the Korean Peninsula, northern China, and northern Japan and has a very limited distribution. Zostera caespitosa is sensitive to pollution and reduced water quality is a particular threat. Habitat loss is also a major threat to this species. Zostera caespitosa is naturally restricted to a narrow depth range. The area of occupancy for this species is less than 2,000 km². This species meets criterion B2 with a continuing decline in area and habitat quality and a restricted and fragmented population. This species is listed as Vulnerable.

Geographic Range [top]

Range Description: Zostera caespitosa has a very limited distribution. It is known from less than 10 locations in the northwest Pacific on the northern coast of China, the Korean Peninsula and in northern Japan. Given its very shallow depth range, patchy distribution, and recent declines in many parts of its range, it has an area of occupancy estimated to be less than 2,000 km2.
Countries:
Native:
China; Japan; Korea, Democratic People's Republic of
FAO Marine Fishing Areas:
Native:
Pacific – northwest
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Populations of Zostera caespitosa are declining in Korea (K.-S. Lee pers. comm. 2008) and China (F.T. Short pers. obs. 2008). In northern China  the establishment of extensive kelp (algal) aquaculture may be rapidly reducing the distribution of this species.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: Zostera caespitosa is usually found in depths between three and eight m (Lee et al. 2001).

In a survey in Jangmok Bay of Geoje Island, Korea, flowering shoots appeared in early March and developed into fruits in early May. By the end of May, all reproductive shoots bore mature fruits. The study indicated that the growth and flowering phenology of Z. caespitosa was strongly coupled to seasonal light conditions (Lee et al. 2005). In Wei Hai, northern China, mature seeds were found in July (F.T. Short pers. comm. 2008).
Systems: Marine

Threats [top]

Major Threat(s): Zostera caespitosa is sensitive to pollution and reduced water quality is a particular threat. Habitat loss is also a major threat to this species.

Within its range in Japan and China there is industrial development in coastal regions, land reclamation resulting in loss of vegetation, water pollution and disturbance of habitats by fish trawling and other fishing activities. In South Korea, there is a large amount of coastal eutrophication and some land reclamation.

Conservation Actions [top]

Conservation Actions: Zostera caespitosa is protected by The Marine Ecosystem Conservation and Management Act in Korea.
Citation: Short, F.T. & Waycott, M. 2010. Zostera caespitosa. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.
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