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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, meer
Peer reviewed article  

Beschikbaar in  Auteurs 

Trefwoorden
    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) Hooker f., 1858 [WoRMS]; Zostera subg. Zosterella japonica Ascherson & Graebner, 1907 [WoRMS]
    ISEW, Viet Nam, Ha Long Bay [Marine Regions]
    Marien/Kust
Author keywords
    Halophila ovalis; Zostera japonica; seagrass; Asia; flowering; clonalbranching; reciprocal transplantation

Auteurs  Top 
  • Huong, T.T.L.
  • Vermaat, J.E., correspondent, meer
  • Terrados, J., meer
  • Tien, N.V.
  • Duarte, C.M., meer
  • Borum, J.
  • Tri, N.H.

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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