Growth of Ecklonia cava (Laminariales, Phaeophyta) sporophytes transplanted to a locality with different temperature conditions
Growth of Ecklonia cava (Laminariales, Phaeophyta) sporophytes transplanted to a locality with different temperature conditions
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Ecklonia cava（海带目、褐藻门）孢子体移植到不同温度条件下的生长情况
DOI：
10.1046/j.1440-1835.2002.00274.x
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发表时间：
2002
影响因子：
1.5
通讯作者：
J. Tanaka
中科院分区：
文献类型：
--
作者：
Y. Serisawa;Y. Yokohama;Y. Aruga;J. Tanaka
通过移栽试验，研究了生长在温暖地区的海带（Laminariales）、褐藻门（Phaeophyta）短柄小型孢子体，移植到较冷地区后是否会转变为长柄大型孢子体。幼年E.从Tosa湾（日本南部）的Tei（海水温度15-29 ℃）收集具有短于5cm长的柄的cava孢子体，并移植到Nabeta湾（日本中部）（海水温度13-25 ℃），其中较大的E型孢子体。腔孢子体以长柄（约1 m）为特征生长。它们被附着在Nabeta湾海底（9米深）的人工鱼礁上，以监测其生长情况。作为比较，少年E.在Nabeta湾生长的几乎相似大小的cava孢子体也以相同的方式移植到相同的实验地点。从1995年11月至1997年10月，每月对Tei和Nabeta的孢子体生长进行观察，为期2年。从冬季到春季，移植的Tei和Nabeta孢子体的菌柄长度和直径增加，而在夏季和秋季几乎没有观察到。在研究期结束时，Nabeta孢子体的菌柄长25.6 cm，直径17.0 mm，而Tei孢子体的菌柄长11.1 cm，直径11.2 mm。Nabeta孢子体的初生叶片长为16.0 cm，Tei孢子体的初生叶片长为5.5 cm。因此，即使在相同的环境条件下，Tei孢子体仍然比Nabeta孢子体小。
Transplanting experiments were carried out to determine whether the small type sporophytes with short stipe of Ecklonia cava Kjellman (Laminariales, Phaeophyta) growing in a locality with warm temperatures, change into larger type with a long stipe when transplanted to a locality with cooler temperatures. Juvenile E. cava sporophytes, having a stipe shorter than 5 cm long were collected from Tei in Tosa Bay (southern Japan) (seawater temperature 15–29°C) and transplanted to Nabeta Bay (central Japan) (seawater temperature 13–25°C), where larger type E. cava sporophytes characterized by long stipe (ca 1 m) grow. They were attached to artificial reefs at the sea bottom (9 m depth) in Nabeta Bay to monitor their growth. For comparison, juvenile E. cava sporophytes of almost similar size growing in Nabeta Bay were also transplanted in the same way to the same experimental site. Observations of growth of sporophytes from Tei and Nabeta were carried out monthly for 2 years from November 1995 to October 1997. The transplanted Tei and Nabeta sporophytes showed an increase in stipe length and diameter from winter to spring, whereas almost no increase was observed during summer and autumn. At the end of the study period, the stipe of Nabeta sporophytes reached 25.6 cm in length and 17.0 mm in diameter, whereas that of Tei sporophytes reached 11.1 cm in length and 11.2 mm in diameter. The primary blade length was 16.0 cm in Nabeta sporophytes, whereas it was 5.5 cm in Tei sporophytes. Thus, Tei sporophytes still remained smaller than Nabeta sporophytes even under the same environmental conditions.