남해 연안에 생육하는 거머리말(Zostera marina L.) 개체군의 생물계절학과 생식 능력
Phenology and Reproductive Effort of Two Zostera marina L. Populations on the Southern Coast of Korea
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Abstract
The phenology and reproductive effort of Zostera marina L. (Dongdae Bay and Aenggang Bay) on the southern coast of Korea were investigated from September 2002 to August 2003. The Dongdae Bay(DB) exhibited a finer sediment grain size with richer organic content than the Aenggang Bay(AB). Water temperature at DB site ranged from 7.5oC in February to 25.5oC in August, while water temperature at AB site ranged from 6.7oC in February to 25.2oC in September. Both populations exhibited a perennial life span, but the sexual reproductive effort was significantly higher at DB than AB. The reproductive shoots of DB site were developed from February to June 2003, while those of AB site from March to June 2003. At DB site, the frequency of reproductive shoot ranged from 11 to 33%, whereas reproductive shoot of AB did below 5%. Reproductive structures were larger and more abundant at DB, with the exception of number of fruits and seeds per spadix. Water temperature seems most important to regulate the timing of reproductive phase of Z. marina populations for two study sites.
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