Seasonality and depth zonation of intertidal Halophila ovalis and Zostera japonica in Ha Long Bay (northern Vietnam)
Huong, T.T.L.; Vermaat, J.E.; Terrados, J.; Tien, N.V.; Duarte, C.M.; Borum, J.; Tri, N.H. (2003). Seasonality and depth zonation of intertidal Halophila ovalis and Zostera japonica in Ha Long Bay (northern Vietnam). Aquat. Bot. 75(2): 147-157. http://dx.doi.org/10.1016/s0304-3770(02)00172-9
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770; e-ISSN 1879-1522, more
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| Keywords |
Distribution > Geographical distribution > Vertical distribution
Distribution > Geographical distribution > Zonal distribution
Environmental effects > Light effects
Environments > Aquatic environment > Marine environment > Intertidal environment
Flora > Weeds > Marine organisms > Seaweeds > Sea grass
Periodicity > Seasonality
Population characteristics > Biomass
Properties > Physical properties > Density
Seasons > Rainy season
Halophila ovalis (R.Brown) J.D.Hooker, 1858 [WoRMS]; Zostera subg. Zosterella japonica Ascherson & Graebner, 1907 [WoRMS]
ISEW, Viet Nam, Ha Long Bay [Marine Regions]
Marine/Coastal |
| Author keywords |
Halophila ovalis; Zostera japonica; seagrass; Asia; flowering; clonalbranching; reciprocal transplantation |
| Authors | | Top |
- Huong, T.T.L.
- Vermaat, J.E., correspondent, more
- Terrados, J., more
- Tien, N.V.
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- Duarte, C.M., more
- Borum, J.
- Tri, N.H.
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| Abstract |
Seasonality and depth zonation of two common intertidal northern Vietnamese seagrass species, Halophila ovalis and Zostera japonica, were investigated in a 50 m long intertidal transect from 1999 till 2001. Z. japonica occurred in the middle intertidal (1.2 m above mean chart datum to mean sea level at 2.1 m above chart datum). H. ovalis occurred deeper in the intertidal (between 1.0 and 1.4 m above chart datum). Based on seasonally different sensitivity to reciprocal transplants, it is concluded that this zonation is most likely due to different tolerances to low light availability (less in Z. japonica) and desiccation (less in H. ovalis). Both species reached maximum shoot densities in September-October with total biomasses around 70 g DW m-2. Flowering in Z. japonica occurred in April only, whilst H. ovalis flowered in November after the rainy season and again in April. Seasonality in density and biomass was apparent and similar between the two species. It was largely coupled to the rainy season, which brings spates of turbid water during May-August, thereby possibly limiting light availability and hence growth. |
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