Diet of Arctic charr (Salvelinus alpinus (L.)) and brown trout (Salmo trutta L.) in sympatry in two high altitude alpine lakes

被引:0
|
作者
L. Cavalli
R. Chappaz
A. Gilles
机构
[1] Université de Provence,Laboratoire d'hydrobiologie, UPRES Biodiversité
[2] 1–3 Pl,undefined
来源
Hydrobiologia | 1998年 / 386卷
关键词
diet; high altitude lake; Salvelinus alpinus; Salmo trutta; extreme oligotrophic conditions;
D O I
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中图分类号
学科分类号
摘要
Lake Pisses and Lake Labarre are two oligotrophic high altitude alpine lakes that have sympatric populations of Arctic charr and brown trout. These two lakes have similar morphometric, physical and chemical characteristics. The zooplanktonic and benthic fauna show little diversity. But the density of benthos (Chironomidae) and zooplankton is higher in Lake Pisses. The fish fauna of Lake Pisses is slightly more abundant than that of Lake Labarre, althought in both lakes fish density is low. A study of the diet of the two species revealed differences. In Lake Pisses, where the food supply is better, Arctic charr takes exclusively pelagic and benthic prey, whereas in Lake Labarre it also takes exogenous prey and thus comes into competition with trout. Length and body weight growth rates for Arctic charr are higher in Lake Pisses than in Lake Labarre. For trout, maximum length recorded was in Lake Pisses. The results show that the abundance of Chironomidae favours coexistence of the two species in Lake Pisses and confirm that, in the face of shortage of food, Arctic charr is better adapted than trout.
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页码:9 / 17
页数:8
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