Diets of siscowet lake trout from the Apostle Islands region of Lake Superior, 1993

被引:22
作者
Fisher, SJ [1 ]
Swanson, BL [1 ]
机构
[1] WISCONSIN DEPT NAT RESOURCES,BAYFIELD,WI 54814
关键词
diet; siscowet lake trout; coregonines; Lake Superior;
D O I
10.1016/S0380-1330(96)70970-X
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Stomach contents of 384 siscowet lake trout (Salvelinus namaycush siscowet) from the Apostle Islands region of Lake Superior were examined to determine if diets exhibited seasonal trends or shifted with predator size. The information was also used to qualitatively compare siscowet and lean lake trout (S. namaycush) diets. Stomachs from siscowet less than 500-mm total length (TL) contained primarily macroinvertebrates (clams, Mysis relicta, and insects), sculpins (Cottidae; mean TL = 45 mm), and coregonines (Coregonus spp.; mean TL = 120 mm). Stomachs from siscowet between 500- and 699-mm TL contained items similar to smaller siscowet, but burbot (Lota lota; mean TL = 162 mm and a 254-min siscowet were also present. Stomachs from siscowet longer than 699-mm TL contained fishes such as burbot (mean TL = 246 mm) and coregonines (mean TL = 240 mm). Dietary proportions of coregonines increased significantly with increasing siscowet length groups. The proportion of the total number of identified taxa and frequency of occurrence of terrestrial insects and sculpins declined significantly across all length groups between June and December. Siscowet and lean lake trout diets were not found to be substantially different and a potential for competition exists.
引用
收藏
页码:463 / 468
页数:6
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