Temperature requirements for seed germination and seedling growth of Zostera marina from central Japan

被引:39
作者
Abe, Mahiko [1 ]
Kurashima, Akira [1 ]
Maegawa, Miyuki [1 ]
机构
[1] Mie Univ, Fac Bioresources, Tsu, Mie 5148507, Japan
关键词
growth; seed germination; seedling; temperature requirement; Zostera marina;
D O I
10.1111/j.1444-2906.2008.01562.x
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The optimal water temperature in seed germination and the upper critical water temperature in seedling growth were determined for Zostera marina collected from Ise Bay, Japan. The relationship between the seed germination rates and seed storage period (0, 30 and 60 days at 0 degrees C) was also examined. The optimal water temperature for seed germination was in the range from 10 to 15 degrees C regardless of the storage periods, in which germination rates ranged from 35 to 57%. Seedlings grown from seed up to 10 cm in total length were cultured for 1 week under various water temperatures to measure their relative growth rates. The optimal water temperature in growth was in the range from 20 to 25 degrees C; relative growth rates ranged from 2.0 to 2.6%. Seedlings could survive up to a water temperature of 28 degrees C, but most seedlings withered at 29 or 30 degrees C. The optimal water temperatures for seed germination and seedling growth were related to the seasonal changes of water temperature at the sampling site. Although seedlings were rarely observed in the field in summer, they can grow at temperatures as high as 28 degrees C. Therefore, Z. marina may extend its distribution as far as where the summer water temperature is lower than 28 degrees C.
引用
收藏
页码:589 / 593
页数:5
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