Trophic polymorphism in brook charr revealed by diet, parasites and morphometrics
Trophic polymorphism in brook charr revealed by diet, parasites and morphometrics
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DOI：
10.1111/j.1095-8649.2007.01720.x
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发表时间：
2008-02-01
影响因子：
2
通讯作者：
Magnan, P.
中科院分区：
文献类型：
--
作者：
Bertrand, M.;Marcogliese, D. J.;Magnan, P.
本文比较了加拿大地盾上两个相邻湖泊沿岸和中上层带的小沙鲑（Salvelinus fontinalis）胃内容物、寄生虫组合和形态计量学特征。在Onze Iles湖，来自沿海地区的鱼胃里有更多的底栖动物猎物，与在远洋地区捕获的鱼相比，它们更容易被利用与沿海地区有关的中间宿主的寄生虫感染。来自这个湖的沿岸和远洋小溪鲑在体形和鳍长方面也有所不同，每一组在解剖学上都适应了各自的栖息地。形态计量学和寄生虫规范评分之间的高度显著相关性支持了紫背紫背虫个体功能多样化的假设。虽然加勒比湖沿岸和远洋区的鱼类在饮食、寄生虫组合或形态计量学方面没有差异，但它们与来自昂泽岛湖的鱼类的不同之处在于，它们较少感染以腹足类为中间宿主的寄生虫，胸鳍较短。湖间比较结果表明，河流中的寄生虫组合和形态计量学特征分别反映了加勒比湖和奥泽莱斯湖的湖泊和沿海生境的优势。
Stomach contents, parasite assemblages and morphometrics were compared in brook charr Salvelinus fontinalis from the littoral and pelagic zone of two adjacent lakes on the Canadian Shield. In lac Baie des Onze Iles, fish from the littoral zone had greater abundance of benthic prey in their stomach and were more heavily infected by parasites that use intermediate hosts associated with the littoral zone than fish captured in the pelagic zone. Littoral and pelagic brook charr from this lake also differed in regard to body shape and fin length, with each group being anatomically adapted to exploit their respective habitats. The highly significant correlation between morphometric and parasite canonical scores supports the hypothesis of functional diversification of individuals within lac Baie des Onze Iles. While fish from littoral and pelagic zones of lac Caribou did not differ in terms of diet, parasite assemblages or morphometrics, they were different to fish from lac Baie des Onze Iles in that they were less frequently infected with parasites that use gastropods as intermediate hosts, and had shorter pectoral fins. The inter-lake comparisons suggested that parasite assemblages and morphometrics of brook charr reflected the dominance of the limnetic and littoral habitats in lacs Caribou and lac Baie des Onze Iles, respectively.