Cormorant predation on PIT-tagged lake fish

Research output: Contribution to journalJournal articleResearchpeer-review

396 Downloads (Pure)

Abstract

The present study use data from recovered PIT (Passive Integrated Transponder) tags to explore species-and size-specific annual predation rates by cormorants on three common lacustrine fishes (size range 120-367 mm) in a European lake; roach (Rutilus rutilus), common bream (Abramis brama) and perch (Perca fluviatilis). In addition, we quantify the level of age/size truncation that cormorant predation could introduce in a population of perch, an important fish for recreational angling as well as for trophic interactions and ecosystem function in European lakes. Based on three years of PIT tagging of fish in Lake Viborg and subsequent recoveries of PIT tags from nearby cormorant roosting and breeding sites, we show that cormorants are major predators of roach, bream and perch within the size groups we investigated and for all species larger individuals had higher predation rates. Perch appear to be the most vulnerable of the three species and based on a comparison with mortality estimates from lakes without significant avian predation, this study suggest that predation from cormorants can induce age/size truncation in Lake Viborg, leaving very few larger perch in the lake. This truncation reduces the likelihood of anglers catching a large perch and may also influence lower trophic levels in the lake and thus turbidity as large piscivorous perch often play an important structuring role in lake ecosystem functioning.
Original languageEnglish
JournalJournal of Limnology
Volume73
Issue number1
Pages (from-to)177-186
ISSN1129-5767
DOIs
Publication statusPublished - 2014

Keywords

  • Lake Viborg Denmark, Europe Palearctic region
  • Passive Integrated Transponder
  • recreational angling
  • species annual predation rate
  • species ecosystem function
  • species mortality
  • species trophic interaction
  • Aves Vertebrata Chordata Animalia (Animals, Birds, Chordates, Nonhuman Vertebrates, Vertebrates) - Pelecaniformes [85550] cormorant common
  • Pisces Vertebrata Chordata Animalia (Animals, Chordates, Fish, Nonhuman Vertebrates, Vertebrates) - Osteichthyes [85206] Perca fluviatilis species perch common Rutilus rutilus species roach common Abramis brama species common bream common
  • 07508, Ecology: environmental biology - Animal
  • 07514, Ecology: environmental biology - Limnology
  • Ecology, Environmental Sciences
  • Freshwater Ecology
  • LIMNOLOGY
  • PERCH PERCA-FLUVIATILIS
  • PHALACROCORAX-CARBO-SINENSIS
  • POPULATION-DYNAMICS
  • GREAT CORMORANTS
  • YELLOW PERCH
  • ESTUARY
  • STOCKS
  • RIVER
  • SIZE
  • DIET
  • avian predation
  • Perca fluviatilis
  • Abramis brama
  • Rutilus rutilus
  • PIT tags
  • mortality

Cite this

@article{53b51b58a0214cd4ad944ba5d7d3666f,
title = "Cormorant predation on PIT-tagged lake fish",
abstract = "The present study use data from recovered PIT (Passive Integrated Transponder) tags to explore species-and size-specific annual predation rates by cormorants on three common lacustrine fishes (size range 120-367 mm) in a European lake; roach (Rutilus rutilus), common bream (Abramis brama) and perch (Perca fluviatilis). In addition, we quantify the level of age/size truncation that cormorant predation could introduce in a population of perch, an important fish for recreational angling as well as for trophic interactions and ecosystem function in European lakes. Based on three years of PIT tagging of fish in Lake Viborg and subsequent recoveries of PIT tags from nearby cormorant roosting and breeding sites, we show that cormorants are major predators of roach, bream and perch within the size groups we investigated and for all species larger individuals had higher predation rates. Perch appear to be the most vulnerable of the three species and based on a comparison with mortality estimates from lakes without significant avian predation, this study suggest that predation from cormorants can induce age/size truncation in Lake Viborg, leaving very few larger perch in the lake. This truncation reduces the likelihood of anglers catching a large perch and may also influence lower trophic levels in the lake and thus turbidity as large piscivorous perch often play an important structuring role in lake ecosystem functioning.",
keywords = "Lake Viborg Denmark, Europe Palearctic region, Passive Integrated Transponder, recreational angling, species annual predation rate, species ecosystem function, species mortality, species trophic interaction, Aves Vertebrata Chordata Animalia (Animals, Birds, Chordates, Nonhuman Vertebrates, Vertebrates) - Pelecaniformes [85550] cormorant common, Pisces Vertebrata Chordata Animalia (Animals, Chordates, Fish, Nonhuman Vertebrates, Vertebrates) - Osteichthyes [85206] Perca fluviatilis species perch common Rutilus rutilus species roach common Abramis brama species common bream common, 07508, Ecology: environmental biology - Animal, 07514, Ecology: environmental biology - Limnology, Ecology, Environmental Sciences, Freshwater Ecology, LIMNOLOGY, PERCH PERCA-FLUVIATILIS, PHALACROCORAX-CARBO-SINENSIS, POPULATION-DYNAMICS, GREAT CORMORANTS, YELLOW PERCH, ESTUARY, STOCKS, RIVER, SIZE, DIET, avian predation, Perca fluviatilis, Abramis brama, Rutilus rutilus, PIT tags, mortality",
author = "Christian Skov and Niels Jepsen and Henrik Baktoft and Teunis Jansen and Stig Pedersen and Anders Koed",
year = "2014",
doi = "10.4081/jlimnol.2014.715",
language = "English",
volume = "73",
pages = "177--186",
journal = "Journal of Limnology",
issn = "1129-5767",
publisher = "Pagepress",
number = "1",

}

Cormorant predation on PIT-tagged lake fish. / Skov, Christian; Jepsen, Niels; Baktoft, Henrik; Jansen, Teunis; Pedersen, Stig; Koed, Anders.

In: Journal of Limnology, Vol. 73, No. 1, 2014, p. 177-186.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Cormorant predation on PIT-tagged lake fish

AU - Skov, Christian

AU - Jepsen, Niels

AU - Baktoft, Henrik

AU - Jansen, Teunis

AU - Pedersen, Stig

AU - Koed, Anders

PY - 2014

Y1 - 2014

N2 - The present study use data from recovered PIT (Passive Integrated Transponder) tags to explore species-and size-specific annual predation rates by cormorants on three common lacustrine fishes (size range 120-367 mm) in a European lake; roach (Rutilus rutilus), common bream (Abramis brama) and perch (Perca fluviatilis). In addition, we quantify the level of age/size truncation that cormorant predation could introduce in a population of perch, an important fish for recreational angling as well as for trophic interactions and ecosystem function in European lakes. Based on three years of PIT tagging of fish in Lake Viborg and subsequent recoveries of PIT tags from nearby cormorant roosting and breeding sites, we show that cormorants are major predators of roach, bream and perch within the size groups we investigated and for all species larger individuals had higher predation rates. Perch appear to be the most vulnerable of the three species and based on a comparison with mortality estimates from lakes without significant avian predation, this study suggest that predation from cormorants can induce age/size truncation in Lake Viborg, leaving very few larger perch in the lake. This truncation reduces the likelihood of anglers catching a large perch and may also influence lower trophic levels in the lake and thus turbidity as large piscivorous perch often play an important structuring role in lake ecosystem functioning.

AB - The present study use data from recovered PIT (Passive Integrated Transponder) tags to explore species-and size-specific annual predation rates by cormorants on three common lacustrine fishes (size range 120-367 mm) in a European lake; roach (Rutilus rutilus), common bream (Abramis brama) and perch (Perca fluviatilis). In addition, we quantify the level of age/size truncation that cormorant predation could introduce in a population of perch, an important fish for recreational angling as well as for trophic interactions and ecosystem function in European lakes. Based on three years of PIT tagging of fish in Lake Viborg and subsequent recoveries of PIT tags from nearby cormorant roosting and breeding sites, we show that cormorants are major predators of roach, bream and perch within the size groups we investigated and for all species larger individuals had higher predation rates. Perch appear to be the most vulnerable of the three species and based on a comparison with mortality estimates from lakes without significant avian predation, this study suggest that predation from cormorants can induce age/size truncation in Lake Viborg, leaving very few larger perch in the lake. This truncation reduces the likelihood of anglers catching a large perch and may also influence lower trophic levels in the lake and thus turbidity as large piscivorous perch often play an important structuring role in lake ecosystem functioning.

KW - Lake Viborg Denmark, Europe Palearctic region

KW - Passive Integrated Transponder

KW - recreational angling

KW - species annual predation rate

KW - species ecosystem function

KW - species mortality

KW - species trophic interaction

KW - Aves Vertebrata Chordata Animalia (Animals, Birds, Chordates, Nonhuman Vertebrates, Vertebrates) - Pelecaniformes [85550] cormorant common

KW - Pisces Vertebrata Chordata Animalia (Animals, Chordates, Fish, Nonhuman Vertebrates, Vertebrates) - Osteichthyes [85206] Perca fluviatilis species perch common Rutilus rutilus species roach common Abramis brama species common bream common

KW - 07508, Ecology: environmental biology - Animal

KW - 07514, Ecology: environmental biology - Limnology

KW - Ecology, Environmental Sciences

KW - Freshwater Ecology

KW - LIMNOLOGY

KW - PERCH PERCA-FLUVIATILIS

KW - PHALACROCORAX-CARBO-SINENSIS

KW - POPULATION-DYNAMICS

KW - GREAT CORMORANTS

KW - YELLOW PERCH

KW - ESTUARY

KW - STOCKS

KW - RIVER

KW - SIZE

KW - DIET

KW - avian predation

KW - Perca fluviatilis

KW - Abramis brama

KW - Rutilus rutilus

KW - PIT tags

KW - mortality

U2 - 10.4081/jlimnol.2014.715

DO - 10.4081/jlimnol.2014.715

M3 - Journal article

VL - 73

SP - 177

EP - 186

JO - Journal of Limnology

JF - Journal of Limnology

SN - 1129-5767

IS - 1

ER -