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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

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Beschikbaar in	Auteurs
VLIZ: Open access 57084 [ download pdf ]

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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) J.D.Hooker, 1858 [WoRMS]; Zostera japonica Ascherson & Graebner, 1907 [WoRMS] Ha Long Bay [Marine Regions] Marien/Kust

Author keywords

Halophila ovalis; Zostera japonica; seagrass; Asia; flowering; clonalbranching; reciprocal transplantation

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Auteurs		Top
Huong, T.T.L. Vermaat, J.E., correspondent Terrados, J. Tien, N.V.	Duarte, C.M. 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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