Temperature characteristics in seed germination and growth of <Emphasis Type="Italic">Zostera japonica</Emphasis> Ascherson &; Graebner from Ago Bay,Mie Prefecture,central Japan |
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| Authors: | Mahiko Abe Keigo Yokota Akira Kurashima Miyuki Maegawa |
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| Institution: | (1) Graduate School of Bioresources, Mie University, Tsu Mie, 514-8507, Japan;(2) Present address: Seikai National Fisheries Research Institute, Fisheries Research Agency, Nagasaki Nagasaki, 851-2213, Japan;(3) Mie Prefecture Kihoku Branch Office, Owase Mie, 519-3695, Japan |
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| Abstract: | The optimal water temperature in seed germination and the upper critical water temperature in seedling growth were determined
for Zostera japonica collected from Ago Bay, Japan. The relationship between the seed germination rates and seed storage period (0, 30, and 60 days)
at 0°C was also examined. The optimal water temperature in seed germination was in the range 15–20°C regardless of the storage
period, in which germination rates were up to 14%. Seedlings, grown from seeds up to 10 cm in total length, were cultured
for 1 week at various water temperatures to measure their relative growth rates. The optimal water temperature in early growth
was in the range 20–25°C; relative growth rates ranged from 3.8 to 4.2%. Seedlings could survive up to a water temperature
of 29°C, but most seedlings withered at 30 or 35°C.
The optimal water temperatures for seed germination and seedling growth were related to the seasonal changes of water temperature
in the sampling site. Although seedlings were hardly observed in Ago Bay in summer, Z. japonica might extend its distribution as far as where the summer water temperature is lower than 29°C. |
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| Keywords: | Culture experiment Growth Seed germination Seedling Temperature characteristic Zostera japonica |
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