Trophic polymorphism in introduced bluegill in Japan
Trophic polymorphism in introduced bluegill in Japan
复制标题
日本引进翻车鱼的营养多态性
DOI：
10.1046/j.1440-1703.2002.00462.x
复制
发表时间：
2002
影响因子：
2
通讯作者：
M. Yuma
中科院分区：
文献类型：
--
作者：
R. Yonekura;K. Nakai;M. Yuma
我们证明，从北美本土引进日本琵琶湖的蓝鳃(Lepomis Macchirus)表现出相当大的营养和形态变化(形态)。对于较大的蓝鳍金枪鱼，发现了三个变型，专门研究三种不同的资源(即浮游生物、底栖无脊椎动物和水生植物)；对于较小的蓝鳍金枪鱼，发现了两个变型，专门研究两个略有不同的猎物分类群(即金枪鱼类和类圆环类浮游生物)。这些变形，特别是对于大型类，主要可以通过中身长度和深度的差异来区分。个体之间的食物专业化和形态分化被认为是对有效资源利用的不同要求的结果，这是在物种丰富的鱼类群落中引入的鱼种中出现营养多态的独特例子。
We demonstrate that bluegill (Lepomis macrochirus) introduced from their native North American source to Lake Biwa in Japan showed considerable trophic and morphological variations (morphs). Three morphs were found for larger bluegills, specialized in three distinct resources (i.e. plankton, benthic invertebrates and aquatic plant), and two morphs were found for smaller bluegills, specialized in two slightly different prey taxa (i.e. calanoid and cyclopoid plankton). These morphs, especially for the large size class, can be distinguished primarily by differences in midbody length and depth. The dietary specialization and morphological differentiation among individuals were considered to be a result of different requirements for efficient resource utilization, which is a unique example of trophic polymorphism occurring in an introduced fish species in a species-rich fish community.