River connectivity reestablished: Effects and implications of six weir removals on brown trout smolt migration

被引：55

作者：

Birnie-Gauvin, K. ^{[1
]}

Candee, M. M. ^{[1
,2
]}

Baktoft, H. ^{[1
]}

Larsen, M. H. ^{[1
,3
]}

Koed, A. ^{[1
]}

Aarestrup, K. ^{[1
]}

机构：

[1] Tech Univ Denmark, Natl Inst Aquat Resources, Sect Freshwater Fisheries Ecol, DTU AQUA, Vejlsovej 39, DK-8600 Silkeborg, Denmark

[2] Univ Copenhagen, Freshwater Biol, Copenhagen, Denmark

[3] Danish Ctr Wild Salmon, Randers, Denmark

来源：

RIVER RESEARCH AND APPLICATIONS | 2018年 / 34卷 / 06期

关键词：

barriers; freshwater ecosystems; migration; removal; river restoration; Salmo trutta; smolt; SALMON SALMO-SALAR; ATLANTIC SALMON; FISH HABITAT; TRUTTA L; SURVIVAL; MOVEMENT; PASSAGE; STREAM; BARRIERS; FRAGMENTATION;

D O I：

10.1002/rra.3271

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Today's river systems have been extensively modified, requiring us to rethink how we approach the management of these important ecosystems. We evaluated the effects of removing 6 weirs in River Villestrup (Jutland, Denmark) on the smolt run of brown trout (Salmo trutta) over the course of 12years. During 5 of these years, we evaluated the number, size, and timing of smolts during their downstream migration. We found an increase in smolt output following the weir removals, along with a decrease in average length and indications of an earlier peak migration. Our results suggest that barrier removal has led to an increase in spawning success by adults, fry survival, recruitment, and smolt migration success. Weir removal is therefore a viable management approach to restore connectivity in freshwater streams and rivers, which promotes the passage of smolts as they migrate to marine environments.

引用

页码：548 / 554

页数：7

共 53 条

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