Variation in migratory history of Japanese eels, Anguilla japonica, collected in the northernmost part of its distribution
Variation in migratory history of Japanese eels, Anguilla japonica, collected in the northernmost part of its distribution
复制标题
DOI：
10.1017/s0025315408001756
复制
发表时间：
2008-08-01
影响因子：
1.2
通讯作者：
Ohji, Madoka
中科院分区：
文献类型：
--
作者：
Ara, Takaomi;Kotake, Aya;Ohji, Madoka
为了研究日本鳗鲡（Anguilla japonica）洄游史的变化，采用x射线电子探针法测定了其分布最北端的咸淡水湖泊中日本鳗鲡（angilla japonica）耳石中锶（Sr）和钙（Ca）的含量。发现了河鳗和河口鳗两种洄游类型。河口鳗鱼占主导地位（85%），而进入淡水栖息地的普通双窝鳗鱼仅占种群总数的15%。河鳗的比例较低，表明居住在附近沿海地区的河口鳗可能对该地区下一代的繁殖贡献更大。河面和河口鳗鲡的生长差异不显著，说明邻近河流的有限承载能力和地理特征可能比其分布北缘的遗传特征和食物丰度更有效地决定了日本鳗鲡的生境利用。
In order to examine the variation Of migratory histories in the Japanese eel, Anguilla japonica, we measured otolith strontium (Sr) and calcium (Ca) concentrations by X-ray electron microprobe analysis in A. japonica collected in a coastal brackish water lake in the northernmost part of its distribution. Two migratory types that were categorized as river eels and estuarine eels were found. Estuarine eels were dominant (85%), while ordinary diadromous eels that had entered the freshwater habitat made up only 15% of the population. The low proportion of river eels suggested that the estuarine eels that inhabit the nearby coastal areas might make a larger reproductive contribution to the next generation in this area. There was no significant difference in growth between the river and estuarine eels, which suggested that the limited carrying capacity of the adjacent river and geographical features might be more effective in determining the habitat use of the Japanese eel than the genetic feature and food abundance at the northern edge of its distribution.