Habitat and Food Segregation of Dwarf and Normal Arctic Charr (Salvelinus alpinus) from Vangsvatnet Lake, Western Norway
Habitat and Food Segregation of Dwarf and Normal Arctic Charr (Salvelinus alpinus) from Vangsvatnet Lake, Western Norway
复制标题
挪威西部 Vangsvatnet 湖矮化和正常北极红点鲑 (Salvelinus alpinus) 的栖息地和食物隔离
DOI：
--
复制
发表时间：
1982
期刊：
影响因子：
--
通讯作者：
B. Jonsson
中科院分区：
文献类型：
--
作者：
K. Hindar;B. Jonsson
本研究的目的是测试 Vangsvatnet 湖中两种红点鲑之间可能的栖息地和食物隔离。 Vangsvatnet 的红点鲑种群由一种苍白表型组成，其侧面有帕尔标记，产卵颜色发育不良（矮红点鲑），另一种表型在非繁殖条件下具有银色侧面和鲜红色产卵颜色（正常红点鲑）。两种变体的习性表明它们在生长季节适应了不同的生态位。分布和食物分析表明，在夏季，两种形态之间存在明显的栖息地和食物隔离，矮红鲑栖息于深水底栖，普通红点鲑则在湖沼区游荡。这种隔离在食物丰富时期被打破，表明栖息地隔离是由于种内食物竞争造成的。对 Vangsvatnet 的红点鲑与附近的 Lonavatnet 湖的比较表明，红点鲑的数量适应了当地的环境因素。
The aim of the present study was to test possible habitat and food segregation between two charr morphs in Vangsvatnet Lake. The charr population of Vangsvatnet consists of one pale phenotype with parr marks along the flanks and poorly developed spawning coloration (dwarf charr), and another phenotype with silvery flanks in nonbreeding condition and bright red spawning colors (normal charr). The habitus of the two morphs indicated that they were adapted to different niches during the growth season. The analyses of distribution and food showed that there was marked habitat and food segregation between the two morphs during summer, when dwarf charr dwelled deep-benthic and normal charr roamed in the limnetic zone. The segregation broke down in periods of food abundance, indicating that the habitat segregation was due to intraspecific competition for food. A comparison of charr morphs of Vangsvatnet with the nearby Lonavatnet Lake suggested that the number of charr morphs is adapted to local environmental co...