Results 1 to 10 of about 225 (143)

Microchemical provenancing of prey remains in cormorant pellets reveals the use of diverse foraging grounds. [PDF]

J Wildl Manage, 2022
Microchemical provenancing was successfully applied to otoliths exposed to digestion by piscivorous birds and it was possible to clarify on a small scale from which waterbodies or habitat clusters the birds obtain their food. By the use of prey provenancing, site‐specific management plans can be developed and the effect of management measures on ...
Oehm J, Zitek A, Thalinger B, Tchaikovsky A, Irrgeher J, Prohaska T, Traugott M.   +6 more
europepmc   +2 more sources

Site fidelity of wintering cormorants Phalacrocorax carbo sinensis in Europe [PDF]

Wildlife Biology, 2002
The breeding population of cormorants Phalacrocorax carbo sinensis has expanded more than twenty‐fold in continental Europe since 1970, and these large piscivorous birds cause conflicts with human fishery interests in large parts of Europe, including areas outside their breeding range ...
Frederiksen, M., Bregnballe, T., van Eerden, M. R., van Rijn, S, Lebreton, J-D.   +4 more
openaire   +3 more sources

Northern range shift may be due to increased competition induced by protection of species rather than to climate change alone. [PDF]

Ecol Evol, 2018
The protection of the species may induce an increase in population that generates increasing competition for optimal feeding areas, which may induce a similar or even a higher northern range shift than the climate change does, or induce an opposite shift with differences between breeding and wintering populations.
Marion L, Bergerot B.
europepmc   +2 more sources

Underwater hearing in the great cormorant (Phalacrocorax carbo sinensis): Methodological considerations [PDF]

Proceedings of Meetings on Acoustics, 2016
The underwater hearing threshold of a great cormorant (Phalacrocroax carbo sinensis) was measured at 2 kHz using psychophysical methods. Previous in-air and underwater testing suggests that cormorants have rather poor in-air hearing compared to other birds of similar size (Johansen, 2016).
Hansen, Kirstin Anderson, Larsen, Ole Næsbye, Wahlberg, Magnus, Siebert, Ursula   +3 more
openaire   +2 more sources

Long‐term monitoring of pikeperch (Sander lucioperca) populations under increasing temperatures and predator abundances in the Finnish coastal waters of the Baltic Sea

Ecology of Freshwater Fish, Volume 32, Issue 4, Page 750-764, October 2023., 2023
Abstract The Baltic Sea has been under intense environmental changes in the recent decades, such as climate change, eutrophication and increasing abundance of top‐predators, which pose serious challenges to its aquatic life. For informed conservation measures and sustainable yields, we need to understand how the populations are being affected ...
Mikko Olin, Outi Heikinheimo, Topi K. Lehtonen, Jari Raitaniemi   +3 more
wiley   +1 more source

Impacts of predation by Eurasian otters on Atlantic salmon in two Norwegian rivers

Freshwater Biology, Volume 68, Issue 7, Page 1176-1193, July 2023., 2023
Abstract The return of the Eurasian otter (Lutra lutra) to western Norway has sparked human–predator conflicts because otters prey on vulnerable Atlantic salmon (Salmo salar) populations. Although predation may not be the ultimate cause of salmon population declines, otters that kill adult salmon in rivers before they spawn impact the salmon spawning ...
Lene Klubben Sortland, Robert J. Lennox, Gaute Velle, Knut Wiik Vollset, Marius Kambestad   +4 more
wiley   +1 more source

Great cormorant (Phalacrocorax carbo sinensis) predation on adult anadromous brown trout (Salmo trutta)

Ecology of Freshwater Fish, Volume 32, Issue 2, Page 488-495, April 2023., 2023
Abstract The increase in abundance of great cormorants (Phalacrocorax carbo sinensis) over the last decades has caused concern for the sustainability of fish populations. Cormorants are opportunistic piscivorous birds that eat fish from a wide range of species and sizes, in marine, lacustrine and riverine habitats.
Kristi Källo, Kim Birnie‐Gauvin, Niels Jepsen, Kim Aarestrup   +3 more
wiley   +1 more source

Investigating the behaviour of Atlantic salmon (Salmo salar L.) post‐smolts during their early marine migration through the Clyde Marine Region

Journal of Fish Biology, Volume 101, Issue 5, Page 1285-1300, November 2022., 2022
Abstract It is thought that survival during migration is particularly poor for Atlantic salmon post‐smolts immediately after entry into sea and particularly in the estuarine environment. Nonetheless, there is currently a lack of information on Atlantic salmon post‐smolt movement behaviour in estuaries in the UK.
Jessie Lilly, Hannele M. Honkanen, David M. Bailey, Colin W. Bean, Ruaidhri Forrester, Jessica R. Rodger, Colin E. Adams   +6 more
wiley   +1 more source

Amfibisk hørelse hos en dykkende fugl, mellemskarven (Phalacrocorax carbo sinensis) [PDF]

Journal of Experimental Biology, 2020
Diving birds can spend several minutes underwater during pursuit-dive foraging. To find and capture prey, such as fish and squid, they probably need several senses in addition to vision. Cormorants, very efficient predators of fish, have unexpectedly low visual acuity underwater.
Larsen, Ole Næsbye, Wahlberg, Magnus, Christensen-Dalsgaard, Jakob   +2 more
openaire   +3 more sources

Size matters? Species‐ and size‐specific fish predation on recently established invasive quagga mussels Dreissena rostriformis bugensis Andrusov 1897 in a large, deep oligotrophic lake

Journal of Fish Biology, Volume 100, Issue 5, Page 1272-1282, May 2022., 2022
Abstract Since its first appearance in Lake Constance in 2016 the invasive quagga mussel Dreissena rostriformis bugensis has come to dominate the mussel community and now occurs in hyperabundant densities over the whole lake bottom. A lake‐wide field study was conducted between 2019 and 2020 to obtain a systematic insight into the importance of this ...
Jan Baer, Christina Spiessl, Alexander Brinker   +2 more
wiley   +1 more source