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

Kim Birnie-Gauvin*, Martin Milton Candee, Henrik Baktoft, Martin Hage Larsen, Anders Koed, Kim Aarestrup

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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 12 years. 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 environment
Original languageEnglish
JournalRiver Research and Applications
Volume34
Issue number6
Pages (from-to)548-554
ISSN1535-1459
DOIs
Publication statusPublished - 2018

Keywords

  • Smolt
  • Salmo trutta
  • River restoration
  • Removal
  • Migration
  • Freshwater ecosystems
  • Barriers

Cite this

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title = "River connectivity reestablished: effects and implications of six weir removals on brown trout smolt migration",
abstract = "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 12 years. 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 environment",
keywords = "Smolt, Salmo trutta, River restoration, Removal, Migration, Freshwater ecosystems, Barriers",
author = "Kim Birnie-Gauvin and Candee, {Martin Milton} and Henrik Baktoft and Larsen, {Martin Hage} and Anders Koed and Kim Aarestrup",
year = "2018",
doi = "10.1002/rra.3271",
language = "English",
volume = "34",
pages = "548--554",
journal = "River Research and Applications",
issn = "1535-1459",
publisher = "John Wiley & Sons Ltd",
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}

River connectivity reestablished: effects and implications of six weir removals on brown trout smolt migration. / Birnie-Gauvin, Kim; Candee, Martin Milton; Baktoft, Henrik; Larsen, Martin Hage; Koed, Anders; Aarestrup, Kim.

In: River Research and Applications, Vol. 34, No. 6, 2018, p. 548-554.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - River connectivity reestablished: effects and implications of six weir removals on brown trout smolt migration

AU - Birnie-Gauvin, Kim

AU - Candee, Martin Milton

AU - Baktoft, Henrik

AU - Larsen, Martin Hage

AU - Koed, Anders

AU - Aarestrup, Kim

PY - 2018

Y1 - 2018

N2 - 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 12 years. 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 environment

AB - 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 12 years. 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 environment

KW - Smolt

KW - Salmo trutta

KW - River restoration

KW - Removal

KW - Migration

KW - Freshwater ecosystems

KW - Barriers

U2 - 10.1002/rra.3271

DO - 10.1002/rra.3271

M3 - Journal article

VL - 34

SP - 548

EP - 554

JO - River Research and Applications

JF - River Research and Applications

SN - 1535-1459

IS - 6

ER -