Cormorant predation on PIT-tagged lake fish

Skov, Christian; Jepsen, Niels; Baktoft, Henrik; Jansen, Teunis; Pedersen, Stig; Koed, Anders

doi:10.4081/jlimnol.2014.715

Cited by 40 publications

(41 citation statements)

References 39 publications

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“…In both lakes, small bream are together with roach conducting partial migrations into the streams during winter (Skov et al, , ) in order to reduce predation risk during a period of very low growth rate (Brönmark, Skov, Brodersen, Nilsson, & Hansson, ). In this study, we focused on the largest size group of bream (≥350 mm), which does not participate in seasonal winter migration into associated streams (Skov et al, ) and is generally outside predation risk from the main predators, pike (Skov et al, ) and cormorants (Nilsson et al, ; Skov et al, ).…”

Section: Methodsmentioning

confidence: 99%

Partial nomadism in large‐bodied bream (Abramis brama)

Brodersen

Hansen

Skov

2019

Ecology of Freshwater Fish

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The recent focus on a common movement ecology paradigm has increased awareness about the importance of distinguishing different movement patterns for understanding their specific impact on animal ecology and evolution. One specific form of movement is nomadism, where animals move between habitats in an arrhythmic fashion. Although not yet described in detail for freshwater fish, nomadism between lakes within drainage systems could affect local lake food webs in an otherwise unpredictable fashion. In this study, we used passive telemetry to describe inter‐lake movements of 1,280 individually tagged adult benthivorous bream (Abramis brama) over nine contiguous years in a drainage system with two paired lakes. The movements can best be described as partial nomadism, where a part of the population is neither resident nor migratory, but instead moves between lakes in a variable, arrhythmic fashion, often with long residency in one lake before moving to the other. We found extensive between‐year variation in the proportion and direction of bream moving, with higher movement propensity being partly associated with lower somatic condition. Notably, movements out of lakes were significantly more in direction of the neighbouring lake than away from the paired lakes, suggesting that at least direction was not random. Since bream are important ecosystem engineers, fluctuating densities of adult bream could affect ecological stability in lakes. Our study suggests that fish populations in interconnected lakes within drainages should not be treated as isolated units, and we discuss this in relation to lake ecology and the importance for lake ecosystem management.

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Section: Methodsmentioning

confidence: 99%

Partial nomadism in large‐bodied bream (Abramis brama)

Brodersen

Hansen

Skov

2019

Ecology of Freshwater Fish

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“…Piscivorous birds such as cormorants represent a very important intermediate link in some food webs (Gwiazda et al, 2014;Skov et al, 2014) and a factor facilitating the dislocation of matter between aquatic and terrestrial ecosystems (Marion et al, 1994;Huang et al, 2014). Their diet is rich in nitrogen (N) and phosphorus (P), which results in a significantly higher excretion of these elements than in herbivorous birds (Marion et al, 1994;Sterner and Elser, 2002).…”

Section: Introductionmentioning

confidence: 97%

Black spots for aquatic and terrestrial ecosystems: impact of a perennial cormorant colony on the environment

Klimaszyk

Brzeg

Rzymski

et al. 2015

Science of The Total Environment

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“…Their diet is almost exclusively composed of a wide range of fish species varying in size, but usually reflecting the seasonal availability of prey at a particular site. Recognized for their highly skilled fish predation, they were largely exterminated and their number remained low over the decades (Ostman et al, 2012;Skov et al, 2014). However, over the past 40 years, a great rise in the population has been observed (van Eerden & Gregersen, 1995;Bzoma et al, 2003;White et al, 2011;Russell et al, 2012;van Eerden et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the impact of cormorants on various elements of both the terrestrial and aquatic environment has been largely addressed in different studies. The birds breed on land but forage on water so they represent a very important intermediate link in some food webs Skov et al, 2014) and a factor facilitating the relocation of matter and possibly also some microbial agents between aquatic and terrestrial ecosystems (Marion et al, 1994;Huang et al, 2014). A large number of potential outcomes of cormorant presence has been demonstrated, including soil fertilization, eutrophication, changes in terrestrial and aquatic vegetation, loss of biodiversity, dispersion of certain pathogens and food web modifications.…”

Section: Introductionmentioning

confidence: 99%

The complexity of ecological impacts induced by great cormorants

Klimaszyk

Rzymski

2015

Hydrobiologia

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Following decades of global extermination, the general population of the great cormorant (Phalacrocorax carbo L.) is on the rise. The lack of regular predators, highly skilled fish rapacity, rapid metabolism, significant rate of excretion and ability to form large nesting colonies on relatively small areas lead to numerous environmental consequences of cormorant presence. Here we comprehensively review the occurrence and distribution of this species and, in particular, its multi-faceted impact on terrestrial and aquatic ecosystems and the main routes through which these impacts are being manifested. The bird-induced chemical loading and its biological and ecological consequences, and the effects on microbial pollution and pathogen dispersion are discussed in particular. The need for further investigation to fully elucidate particular effects is stressed throughout the paper. It is concluded that the environmental effects of great cormorants are rather complex, can lead to serious ecosystem modifications and that the presence of these birds should be taken into consideration in ecological assessment and monitoring.

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Cormorant predation on PIT-tagged lake fish

Abstract: The present study use data from recovered PIT (Passive Integrated Transponder)

Cited by 40 publications

References 39 publications

Partial nomadism in large‐bodied bream (Abramis brama)

Partial nomadism in large‐bodied bream (Abramis brama)

Black spots for aquatic and terrestrial ecosystems: impact of a perennial cormorant colony on the environment

The complexity of ecological impacts induced by great cormorants

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