Interaction of sauger Sander canadensis and walleye Sander vitreus in a large, shallow northern river

被引:1
|
作者
Haxton, Tim [1 ]
Friday, Mike [2 ]
机构
[1] Ontario Minist Nat Resources & Forestry, Aquat Res & Monitoring Sect, 2140 East Bank Dr, Peterborough, ON K9J 7B8, Canada
[2] Ontario Minist Nat Resources & Forestry, Northwest Biodivers & Monitoring Unit, Rosslyn, ON, Canada
关键词
large shallow river; Sander canadensis; Sander vitreus; sympatric; year-class; STIZOSTEDION-CANADENSE; COMPETITION; LAKE;
D O I
10.1111/jfb.14080
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
The objectives of this study were to: (1) determine the relative abundance of sauger Sander canadensis and walleye S. vitreus within the Rainy River using a standardized index netting technique; (2) assess the life-history characteristics of the two species in a northern river; (3) examine the spatial distribution of the two species; (4) assess year-class synchrony. At a larger scale, relative abundance of S. canadensis and S. vitreus were similar among sections of the river. However, at a finer scale, S. canadensis were the dominant species over more area (24%) of the river than S. vitreus (12%). Life-history traits for both species were within the range reported for North American. Mortality rates were similar, suggesting that anglers were not affecting one species more than the other. Year-class strengths were not synchronous between S. canadensis and S. vitreus (r = 0.07). There was evidence of S. canadensis potentially outcompeting S. vitreus with a strong year class of S. canadensis followed by a very weak class of S. vitreus. Additionally, S. canadensis were larger than S. vitreus in most sections of the river when adjusted for mean size. However, the potential interspecific competition was not to the exclusion of S. vitreus. Turbidity was probably the factor that enable S. canadensis to survive sympatrically with S. vitreus given their inability to segregate by depth within the river.
引用
收藏
页码:847 / 854
页数:8
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