Expansion of the Cormorant (Phalacrocorax Carbo Sinensis) Population in Western Lithuania

2002 ◽  
Vol 12 (3) ◽  
pp. 283-287 ◽  
Author(s):  
Ramunas Žydelis ◽  
Gediminas Gražulevič ◽  
Jūratė Zarankaitė ◽  
Romas Mečionis ◽  
Mindaugas Mačiulis
Keyword(s):  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis

scholarly journals Estimating the mortality caused by great cormorant predation on fish stocks: pikeperch in the Archipelago Sea, northern Baltic Sea, as an example

2016 ◽  
Vol 73 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Outi Heikinheimo ◽  
Pekka Rusanen ◽  
Katja Korhonen
Keyword(s):  
Age Groups ◽  
Total Mortality ◽  
Sensitivity Analyses ◽  
Fish Stock ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
Fish Stocks ◽  
Archipelago Sea ◽  
Phalacrocorax Carbo Sinensis ◽  
The Impact

Estimates of the mortality rates caused by cormorants are needed to assess the impact on fish stock dynamics and fisheries. In this study, we calculated the annual instantaneous mortality caused by great cormorants (Phalacrocorax carbo sinensis) on young pikeperch (Sander lucioperca), using data from Archipelago Sea, southwestern coast of Finland. The pikeperch are vulnerable to cormorant predation mainly at the ages 2–4. The annual instantaneous mortality caused by cormorants was between 0.04 and 0.13, and the estimated effect on the pikeperch stock size at recruitment to the fishery ranged from 4% to 23%, respectively. The average annual cormorant-induced mortality accounted for 5%–34% of the total mortality in these age groups. The sensitivity analyses proved that the rates of mortality from other sources largely affect the estimated mortality from cormorant predation. In cases with strong fluctuations in the abundance of the prey fish stocks, ignoring the size and density dependence of the natural mortality may lead to overestimation of the importance of cormorants as competitors of fisheries.

scholarly journals Using stable isotopes to unravel and predict the origins of great cormorants (Phalacrocorax carbo sinensis) overwintering at Kinmen

2008 ◽  
Vol 22 (8) ◽  
pp. 1235-1244 ◽  
Author(s):  
Yuan-Mou Chang ◽  
Kent A. Hatch ◽  
Tzung-Su Ding ◽  
Dennis L. Eggett ◽  
Hsiao-Wei Yuan ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Phalacrocorax Carbo ◽  
Phalacrocorax Carbo Sinensis ◽  
Great Cormorants

Infestation of the black cormorants (Phalacrocorax carbo sinensis L. 1758) from the colony on the Selment Wielki, with the nematode Contracaecum rudolphii Hartwich, 1964 (Nematoda, Anisakidae)

2008 ◽  
Vol 37 (4) ◽  
Author(s):  
Janina Dziekońska-Rynko ◽  
Jerzy Rokicki
Keyword(s):  
Seasonal Changes ◽  
Phalacrocorax Carbo ◽  
Mean Values ◽  
Phalacrocorax Carbo Sinensis ◽  
Contracaecum Rudolphii ◽  
Very High

Infestation of the black cormorants (Seasonal changes in the intensity and prevalence of infestation of the black cormorants from the colony on Lake Selment Wielki were investigated. In 2006, the cormorants were procured in April, August, and October, while in 2007, they were collected in August and September. The prevalence of the infestation was very high and reached 100%. The highest intensity (mean values of 102.46 and 82.17 nematodes/bird in 2006 and 2007, respectively) was revealed in the cormorants shot in August. Intensity of infestation of those birds procured in autumn 2006 was more than twice that found in spring and one-fourth of that found in summer of that year. Similarly, in autumn of 2007, the birds' stomachs contained less than half of the number of nematodes recorded in summer of that year.

scholarly journals Impact of cormorant (Phalacrocorax carbo sinensis L.) colonies on microbial pollution in lakes

2013 ◽  
Vol 13 (3) ◽  
pp. 139-145 ◽  
Author(s):  
Piotr Klimaszyk ◽  
Piotr Rzymski
Keyword(s):  
National Park ◽  
Coliform Bacteria ◽  
Most Probable Number ◽  
Phalacrocorax Carbo ◽  
Breeding Colony ◽  
Probable Number ◽  
Microbial Pollution ◽  
Phalacrocorax Carbo Sinensis ◽  
High Pollution ◽  
Over 40 Years

AbstractDuring 2009-2011 we investigated the effect of perennial and roosting cormorant (Phalacrocorax carbo sinensis) colonies on microbial pollution in 3 lakes: Góreckie (Greater Poland National Park), Chrzypsko (Greater Poland Province) and Ostrowiec (Drawa National Park). On Lake Góreckie cormorants formed a roosting colony (<200 individuals) that inhabited part of the lake shore. On Lake Chrzypsko a new breeding colony was formed (3 nests) while the breeding colony on Lake Ostrowiec, established over 40 years ago, consisted of over 170 breeding pairs. In the case of Lake Ostrowiec, high pollution with coliform bacteria (including Escherichia coli) was observed. Compared to the control station the significantly higher Most Probable Number (MPN) of coliform bacteria was found in groundwater under the colony. It was found that bacterial counts decreased in the direction of the centre of the water body with the highest numbers noted in the lake samples collected within the colony boundaries. Furthermore, seasonal variations in coliform bacteria were also observed with maximum densities during the breeding season. Similar trends were observed for the roosting colony on Lake Góreckie while for the newly forming colony on Lake Chrzypsko increased density of investigated bacteria was noted only in groundwater.

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