Link between estuarine fish abundances and prey choice of the great cormorant Phalacrocorax carbo (Aves, Phalacrocoracidae)

Magath, Victoria; Abraham, Rudolf; Helbing, Uwe; Thiel, Ralf

doi:10.1007/s10750-015-2384-0

Cited by 12 publications

(8 citation statements)

References 57 publications

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Section: Discussioncontrasting

confidence: 71%

“…In contrast, most studies to date have documented cormorants targeting significantly smaller fish than the ones tagged in this study (Fonteneau et al, 2009; Lyach et al, 2018; Magath et al, 2016). Although the present study did not compare predation probability across life stages, a previous study on juvenile sea trout from river Villestrup found that smaller individuals were more likely to be predated (Källo et al, 2020).…”

Section: Discussioncontrasting

confidence: 65%

See 1 more Smart Citation

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

Källo

Birnie‐Gauvin

Jepsen

et al. 2023

Ecology of Freshwater Fish

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Section: Discussioncontrasting

confidence: 71%

Section: Discussioncontrasting

confidence: 65%

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

Källo

Birnie‐Gauvin

Jepsen

et al. 2023

Ecology of Freshwater Fish

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“…The great cormorant is a widespread colonial waterbird with an expanding population of 120 000 individuals in northwestern Europe and a global population of several million [11]. Great cormorants are piscivorous and forage during daytime in coastal areas, estuaries, lakes and rivers [12]. Important freshwater prey species include Cyprinidae (e.g.…”

Section: Methods (A) Study Speciesmentioning

confidence: 99%

Great cormorants reveal overlooked secondary dispersal of plants and invertebrates by piscivorous waterbirds

et al. 2017

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21In wetland ecosystems, birds and fish are important dispersal vectors for plants and 22invertebrates, but the consequences of their interactions as vectors are unknown. Darwin 23 suggested that piscivorous birds carry out secondary dispersal of seeds and invertebrates via 24 predation on fish. We tested this hypothesis in the great cormorant (Phalacrocorax carbo L.). 25Cormorants regurgitate pellets daily, which we collected at seven European locations and 26 examined for intact propagules. One-third of pellets contained at least one intact plant seed, 27 with seeds from 16 families covering a broad range of freshwater, marine and terrestrial 28 habitats. Of 21 plant species, only two have an endozoochory dispersal syndrome, compared 29 to five for water and eight for unassisted dispersal syndromes. One-fifth of the pellets 30 contained at least one intact propagule of aquatic invertebrates from seven taxa. Secondary 31 dispersal by piscivorous birds may be vital to maintain connectivity in meta-populations and 32 between river catchments, and in the movement of plants and invertebrates in response to 33 climate change. Secondary dispersal pathways associated with complex food webs must be 34 studied in detail if we are to understand species movements in a changing world. 35 36

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“…Other important cormorant foods were butterfish Pholis gunnellus , cod, saithe Pollachius virens , plaice Pleuronectes platessa , wolf–fish Anarhichas lupus , lumpsucker Cyclopterus lumpus , and the spider crab Hyas araneus (Lilliendahl & Sólmundsson, ). No abundance indices are available for the bullrout but the relative importance of each food fish may vary annually and prey choice probably depends more on fish size than species (Cech, Cech, Kubecka, Prchalova, & Drastík, ; Dias, Morais, Leopold, Campos, & Antunes, ; Gustavsen, ; Magath, Abraham, Helbing, & Thiel, ). We are not aware of any potential diet changes in cormorants during our study period 1975–2015.…”

Section: Methodsmentioning

confidence: 99%

“…(Lilliendahl & Sólmundsson, 2006). No abundance indices are available for the bullrout but the relative importance of each food fish may vary annually and prey choice probably depends more on fish size than species (Cech, Cech, Kubecka, Prchalova, & Drastík, 2008;Dias, Morais, Leopold, Campos, & Antunes, 2012;Gustavsen, 2017;Magath, Abraham, Helbing, & Thiel, 2016). We are not aware of any potential diet changes in cormorants during our study period 1975-2015.…”

Section: Census Of Breeding Coloniesmentioning

confidence: 98%

Numbers and distribution of the Great Cormorant in Iceland: Limitation at the regional and metapopulation level

Gardarsson

Jónsson

2019

Ecology and Evolution

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We studied a metapopulation of great cormorant (Phalacrocorax carbo) in Iceland, using complete aerial censuses of nests in 25 years during 1975–2015. Age composition was estimated in 1998–2014 by ground surveys in September and February. Brood size was estimated from aerial photographs in 2007–2015. Weather, food, breeding habitat, and density were considered as explanatory variables when examining numerical and distributional changes in the cormorant metapopulation. In 1975–1990 total nest numbers changed little, very low numbers about 1992 were followed by an annual increase of 3.5% in 1994–2015. Total nest numbers were positively correlated with estimates of spawning stocks of cod and saithe and inversely related to the subpolar gyre index (SPG‐I). During the increase in 1994–2015, average colony size at first increased and then declined. Habitat use also changed: the proportion of nests on small rocky islets (skerries) at first declined, from 69% to 44% in 1995–2003 and then increased again to about 58% in 2012–2014. Habitat changes were probably a response to changed patterns of human disturbance. Breeding density, as nests per km 2 sea <20 m deep, was rather uniform among five defined regions in 1975–1996. Thereafter, densities became much higher in two sheltered regions with kelp forests and in one mostly exposed region. A second exposed region remained low and in the third nest numbers declined markedly. Thus, carrying capacity was higher in sheltered regions where cormorant breeding had historically been depressed by human disturbance. Brood size varied little among regions but declined with the years from about 2.5 to 1.8. The proportion of juveniles in September (fecundity) declined in 1998–2015 from over 0.4 to 0.3 and was inversely correlated with year and nest numbers, if outlier years were excluded, suggesting resource limitation. Survival of juvenile cormorants in September–February was estimated at 0.471 ± 0.066 SE . Commercial fish stocks and climate indices were not correlated with the proportion of juveniles. Annual survival of adults (breeding and nonbreeding) was estimated from nest counts and age composition 1999–2014, as 0.850 ± 0.026 SE and showed no trend in 1998–2014. We conclude that the metapopulation of cormorants in Iceland was resource‐limited at two levels: fecundity at the regional and winter survival at the total level.

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Link between estuarine fish abundances and prey choice of the great cormorant Phalacrocorax carbo (Aves, Phalacrocoracidae)

Cited by 12 publications

References 57 publications

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

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

Great cormorants reveal overlooked secondary dispersal of plants and invertebrates by piscivorous waterbirds

Numbers and distribution of the Great Cormorant in Iceland: Limitation at the regional and metapopulation level

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