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ISSN : 2287-8327

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Vol.28 No.5
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Change of Distribution of Vascular Hydrophytes in the Nakdong River Estuary and Growth Dynamics of Schenoplectus trqueter, Waterfowl Food Plant

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2005, v.28 no.5, pp.335-345




& (2005). Change of Distribution of Vascular Hydrophytes in the Nakdong River Estuary and Growth Dynamics of Schenoplectus trqueter, Waterfowl Food Plant. Journal of Ecology and Environment, 28(5), 335-345.
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Abstract

A study on changes on the distribution of vascular hydrophytes and the growth pattern ofSchenoplectus triqueter (Scirpus triqueter) was undertaken at the Nakdong River estuary from 2002 to 2004. The change was due to physical alteration of the estuary for the past 25 years. These plant species are the major food sources for winter waterfowl. A total of 32 species of vascular hydrophytes from 17 families were found Estuary (brackish water). After the construction of the barage on the estuary in 1987, the number of hydrophytes has remarkably increased to 17 species (5 species in 1985) in the main channel of the River. In particular, a comunity of Eurale ferox was found at the backwater wetland of the Daejeo side of the main channel. The introduced species of Eichhornia crassipes and Pistia stratiotes that were epidemic in 2001 at West Nakdong River was not found any more. The other species such as Nymphoides indica , Myriophyllum spicatum, Ruppia spp. were rediscovered. The large area (about 1,300ha) of Zostera sp. was the main sources of food for swans, but disappeared because of direct and indirect impacts of reclamation in the River estuary. Curently, there remains a small patch of Zostera spp. and about 250ha of S. triqueter. Schenoplectus triqueter grew mostly between April-September and tuber formed, between September~October. The growth of S. triqueter up to 60~80cm in length was observed in 5 sites out of the 7 sites in brackish area. Tubers of S. triqueter were eaten by waterfowls such as swans as winter food. In five sites, tubers took 44~57% of total biomass in October. Tubers were found in deep layers; 5~15cm (9%), 15~25cm (28%), 25~40cm (55%), below 40cm (6~7%). The reclamation of the area. In order to determine the extent of changes of the distribution of these plants and the carrying capacity of the area for waterfowl, an intensive research is urgently needed.

keywords
Nakdong River estuary, Schenoplectus triqueter (Scirpus triqueter), Vascular Hydrophytes, Zostera spp., Nakdong River estuary, Schenoplectus triqueter (Scirpus triqueter), Vascular Hydrophytes, Zostera spp.

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