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21 results for “Great cormorant”
Fig. 2 in Diet, Prey Selection and Biomass Consumption of the Great Cormorant (Phalacrocorax carbo) in Algeria
Fig. 2. Monthly variation of the biomass of consumed fish by the great cormorant in Beni Haroun Dam Lake in Algeria.
Figure 1 in Mammals under a colony of great cormorants: population structure and body condition of yellow-necked mice
Figure 1. Location of Zones A–E in the colony of great cormorants near Juodkrantė, West Lithuania, 2011–2013.
Fig. 9 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 9. Size differences between infected and non-infected cormorants. The black line represents the median length (a and b) and median weight (c). The grey box represents the middle 50% of the data (n = 65).
Fig. 7 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 7. Size differences of cormorants between Kustavi and Airisto in terms of body length and body weight (n = 65). The black line represents the median length and weight. The grey box represents the middle 50% of the data (n = 65).
Fig. 6 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 6. Left: Body length of herring in the Archipelago Sea (n = 1167) and the Bothnian Sea (n = 1528) in 2018 and in the infected and non-infected herring (n = 7002). The black line represents the median length, and the grey box is the middle 50% of the data.
Fig. 2 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 2. Mean annual salinity (PSU) and temperature (T, ◦C) of the winter months (January–April) in the Bothnian Sea at 0–50 m depth during 1980–2021. Data from ICES Oceanographic dataset, 2021. ICES, Copenhagen.
Fig. 8 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 8. Size differences of cormorants between sexes (a, b, and c) and adults and juveniles (d, e, and f). The black line represents the median length (a, b, d, and e) and median weight (c and f). The grey box represents the middle 50% of the data (n = 65).
Fig. 3 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 3. Acanthocephala parasites in the body cavity of a herring (left; the red circle indicates the position of worms) and on the inner surface of the intestine of a cormorant (right). The upper photo indicates the size of parasites compared to a match (photos: J. Sahlst´en). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 1. Map showing the sampling sites in the northern Baltic Sea: A = Archipelago Sea, B = Uusikaupunki, C = Merikarvia. The sampling locations in region A: 1 = Taivassalo, 2 = Velkua trawl area, 3 = western Rym¨attyl¨a, 4 = northern Airisto Inlet, 5 = Peimari.
Fig. 5 in The prevalence of Corynosoma parasite worms in the great cormorants and the Baltic herring in the northern Baltic Sea, Finland
Fig. 5. Prevalence (%) of the corynosoma infection in the Baltic herring in the Bothnian Sea (n = 1528) and the Archipelago Sea in 2018 (n = 1167). The black solid line expresses a linear trend: y = 7.55x + 6.33, r = 1.00.
Figure 2 in Species diversity and composition of Oribatida (Acari: Sarcoptiformes) in former breeding colonies of the great cormorant (Phalacrocorax carbo) in Poland
Figure 2. Number of species from individual ecological groups in each studied site.
Figure 1 in Species diversity and composition of Oribatida (Acari: Sarcoptiformes) in former breeding colonies of the great cormorant (Phalacrocorax carbo) in Poland
Figure 1. The abundance of oribatid mites from individual ecological groups in each studied site.
Fig. 1 in Diet, Prey Selection and Biomass Consumption of the Great Cormorant (Phalacrocorax carbo) in Algeria
Fig. 1. Geographical location of Beni-Haroun Dam Lake in Algeria.
Great cormorant diet data from the Norwegian coast
<p>Piscivorous wildlife is often perceived as competitors by humans. Great cormorants of the continental subspecies (<i>Phalacrocorax carbo sinensis</i>) in the Baltic and North Sea increase, while local cod (<i>Gadus morhua</i>) stocks decline. In contrast, numbers of the Atlantic subspecies (<i>P. c. carbo</i>), breeding along the Norwegian and Barents Seas have been relatively stable.</p> <p>We investigated the diet of both great cormorant subspecies in breeding colonies along the Norwegian Coast from Lofoten to the Skagerrak and estimated <a name="_Hlk42867405">the biomass of fish consumed annually by great cormorants in Norwegian waters. </a>The birds' consumption was compared with estimated fish stock sizes and fishery catches.</p> <p>Cod and saithe (<i>Pollachius virens</i>) dominated the diet in the Norwegian Sea, and wrasses in the North Sea and Skagerrak. Estimated total fish consumption of cod and saithe by great cormorants was < 1.7% of estimated fish stocks and < 9% of that of human catches and therefore considered minor. Cormorant consumption of wrasses amounted to 110% of human catches.</p> <p>The practice of using wrasses as cleaner fish in the salmon farming industry leads to a conflict with cormorants, and we urge for a better understanding and management of wrasse populations, taking ecosystem functioning and natural predation into account.</p>
Data from: Numbers and distribution of the Great Cormorant in Iceland: limitation at the regional and metapopulation level
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 km2 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.
Figure 2 in Reproductive performance of the great cormorant (Phalacrocorax carbo sinensis) in three Greek colonies
Figure 2. Clutch size distribution of the great cormorant in three Greek colonies in 2001 and 2002. See Table 1 for sample sizes.
Great cormorant diet data from the Norwegian coast
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Data from: Great cormorants reveal overlooked secondary dispersal of plants and invertebrates by piscivorous waterbirds
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Data from: Numbers and distribution of the Great Cormorant in Iceland: limitation at the regional and metapopulation level
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Figure 2. Zones A–D in Mammals under a colony of great cormorants: population structure and body condition of yellow-necked mice
Figure 2. Zones A–D, in which small mammals were trapped in 2011–2014: Zone A – strongest and longest-lasting influence of the colony; Zone B – expanding part of the colony, Zone C – strong former influence; Zone D – ecotone zone between colony and surrounding forest.
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International Brain Laboratory public data
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