Overview

Distribution

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.
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Localities documented in Tropicos sources

Zostera caespitosa Miki:
Japan (Asia)
North Korea (Asia)
South Korea (Asia)
China (Asia)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Ecology

Habitat

Habitat and Ecology

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
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Zostera caespitosa

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Source: Barcode of Life Data Systems (BOLD)

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Statistics of barcoding coverage: Zostera caespitosa

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 3
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
B2ab(ii,iii)

Version
3.1

Year Assessed
2010

Assessor/s
Short, F.T. & Waycott, M.

Reviewer/s
Livingstone, S., Harwell, H. & Carpenter, K.E.

Contributor/s

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.
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Population

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
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Threats

Major Threats
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.
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Management

Conservation Actions

Conservation Actions
Zostera caespitosa is protected by The Marine Ecosystem Conservation and Management Act in Korea.
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