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1

DDT and HCH in liver fat of Cormorants

100%
Fabczak J., Szarek J., Skibniewska K., Smoczynski S. S.
Polish Journal of Environmental Studies
|
2001
|
tom 10
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nr 2
Eighty cormorants from the area of Ostroda and Mrągowo were used for this study. The analyses were carried out between 1993-1996. Each year 10 two-year-old birds were shot (5 females and 5 males) in two nesting grounds. On average, the amount of concentrated DDT in cormorant liver fat was 4.914 mg/kg and y-HCH was 0.039 mg/kg of wet mass. The average amount of DDT in subsequent years varied and ranged from 2.515 to 7.252 mg/kg; however, the differences were statistically insignificant. The females accumulated higher levels of DDT than the males, on average up to 8.796 mg/kg. The differences in DDT amounts concentrated in liver fat of both cormorant groups in different years appeared to be insignificant. Liver concentrations of γ -HCH in the observed period most frequently showed tendency to increase, from the level of 0.012 in 1993 to 0.106 mg/kg in 1995. This value decreased in 1996 to 0.003 mg/kg. Higher amounts of γ-HCH in liver fat were recorded in birds originating form the Mrągowo area, excluding the individuals shot in 1995. It was shown that the males accumulated higher levels of γ -HCH in their livers than the females (years 1993, 1994 and 1996). The presented study shows the continuous threat of the analyzed xenobiotic agents to water fowl and the need for continuous monitoring of water fowl in respect of their intoxication by DDT and HCH.
2
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Content available

Gastro-intestinal nematodes of cormorants (Phalacrocorax carbo L. 1758) from the upper and the lower Vistula

86%
Dziekonska-Rynko J., Stocka I., Mierzejewska K., Stanczak K., Wziatek B.
Annals of Parasitology
|
2016
|
tom 62
|
nr Suppl.
3

Determination of total mercury in fish and Cormorant using cold vapour atomic absorption spectrometry

86%
Konieczka P., Misztal-Szkudlinska M., Namiesnik J., Szefer P.
Polish Journal of Environmental Studies
|
2010
|
tom 19
|
nr 5
One of the most frequently used methods for determining total mercury content in biological samples is cold vapour atomic absorption spectrometry (CV-AAS), which is extensively used in the biomonitoring of environmental pollution. Seabirds are often used as bioindicators of metal contamination because of their specific feeding habits, wide geographical ranges and long lifespan. This paper describes the validation of CV-AAS for determining the total mercury content in biological samples (whole fish, cormorant tissues). The development and optimization of the procedure is outlined, and the main objective of this study was to calculate its validation parameters. The selectivity of the method was documented; linearity (r>0.993) ranged from 0.29 to 100 ng of total mercury per sample mass. For a total Hg content of 80-1,000 ng, a polynomial calibration curve derived directly the Lambert-Beer law was used. The method showed good recoveries (average 98.0%) and a relative standard deviation for repeatability of < 10%. The limit of detection was calculated at 0.096 ng of total Hg per sample mass. The uncertainty budget was evaluated according to the ‘Guide to the Expression of Uncertainty in Measurement’ (GUM) [1]; the relative expanded uncertainty was estimated at < 13%.
4

Cormorant [Phalacrocorax carbo] predation on fish populations in rivers of the Czech Republic

86%
Spurny P., Mares J.
Folia Universitatis Agriculturae Stetinensis. Piscaria
|
2000
|
tom 27
5

The effect of medium aeration on the embryological development of Contracaecum rudolphii Hartwich, 1964

72%
Dziekonska-Rynko J.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2008
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tom 50
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nr 1
6

Fish in the diet of the Cormorant and the Yellow-legged Gull breeding near fish ponds [upper Vistula river valley, Southern Poland] - preliminary study

72%
Gwiazda R.
Acta Zoologica Cracoviensia
|
2004
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tom 47
|
nr 1-2
Examination of fish in the diet of Cormorants (pursuit divers) and Yellow-legged gulls (surface plungers) in colonies in an area adjacent to fish-ponds was carried out in 2000-2003. The examined colony of Cormorants consisted of 41-45 nests and that of the Yellow-legged Gulls – 41-90 nests during the study. The diet of Yellow-legged Gulls in freshwater habitats is not well known. The prey of Cormorants consisted of only seven species of fish. Carp was the most numerous prey at 69% of consumed fish. Fourteen species of fish were recorded in the food of the Yellow-legged Gulls with the domination of carp (38%) and roach (34%). Rheophilous fish made up 5-19% of food by number. Both species caught large fish, but generally Cormorants caught on average larger fish. The same pattern was confirmed when carp was compared. The mean prey size of the Cormorants was 20.6 cm in total length (range 7-41 cm) and that of Yellow-legged Gulls 18.5 cm (range 9-47 cm). Fish are the principal food item for both Cormorants and Yellow-legged Gulls in the studied sites in southern Poland.
7

Deterioration of the fish community of the salmonid Dyje River caused by overwintering cormorant [Phalacrocorax carbo]

72%
Spurny P.
Acta Scientiarum Polonorum. Piscaria
|
2003
|
tom 02
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nr 1
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The occurrence of parasites in cormorant's prey fish from colony Katy Rybackie - Vistula Lagoon, Poland

72%
Wlasow T., Gomulka P., Martyniak A., Hliwa P.
Wiadomości Parazytologiczne
|
1998
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tom 44
|
nr 3
9

Spontaneous and artificial spawning of perch [Perca fluviatilis L.] as studied on individuals collected from two populations

72%
Kucharczyk D., Mamcarz A., Kujawa R., Wyszomirska E., Skrzypczak A.
Folia Universitatis Agriculturae Stetinensis. Piscaria
|
2000
|
tom 27
10

Towards the optimal foraging strategy: is seasonal shift in the diet of Cormorants Phalacrocorax carbo ( L.) in a dam reservoir the effect of water temperature or size pattern in fish assemblages?

58%
Gwiazda R., Amirowicz A.
Polish Journal of Ecology
|
2010
|
tom 58
|
nr 4
According to optimal foraging theory the prey choice strongly affects the benefitcost ratios. Predators search prey giving the highest benefit and costs of all components of predation (i.e. prey search, encounter, pursuit, capture, and handling) may be considerably reduced if the prey is more available. The study on Cormorant diet and the species composition of prey fish assemblages in the Dobczyce Reservoir (area 985 ha, submontane, eutrophic reservoir in Southern Poland) in spring (May-June) and in autumn (OctNov) showed differences in the food composition and the prey size affected by seasonal changes in fish availability. The diet of Cormorant included eleven fish species and the dominant species in the food was roach in spring (72%) and roach and perch in autumn (49% in total). Roach and perch had the highest share in prey assemblages too (56% in spring, and 53% in autumn). Significant preference toward roach in spring was found. The share of roach and perch did not changed seasonally and could not explain the change in the composition of Cormorant diet. The range of the total length (LT) of fish in Cormorant diet was 3.5–35.2 cm. Diet consisted of distinctly smaller fish in autumn. Relative number of small fish was ca 3 times greater in this period compared to spring. Weighted mean of fish TL in prey assemblage was 20.0 cm for roach and 12.5 cm for perch in spring, and 11.8 and 8.1 in autumn, respectively. The proportion of average weight of roach (W = 0.004074 LT³‧³³⁴) to that of perch (W = 0.005779 LT³‧²⁶⁰) was greater in spring (4.1:1) than in autumn (2.9:1). Probably it can explain the diet shift in autumn. The switch to smaller but more abundant fish in autumn was not related to temperature but to fish availability which reduced the cost of searching and the prey may be easily found.
11

May a cormorant colony be a source of coliform and chemical pollution in a lake?

58%
Klimaszyk P.
Oceanological and Hydrobiological Studies
|
2012
|
tom 41
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nr 1
12

Bacteriological indicators of pollution and sanitary states of Dlugie Wigierskie Lake water in the presence of cormorants [Phalocrocorax carbo]

58%
Wisniewska H., Niewolak S., Korzeniewska E., Filipkowska Z.
Archiwum Ochrony Środowiska
|
2007
|
tom 33
|
nr 1
13

The contribution of round goby [Neogobius melanostomus Pallas, 1811] to the food supply of cormorants [Phalacrocorax carbo Linnaeus, 1758] feeding in the Puck Bay

58%
Bzoma S.
Bulletin of the Sea Fisheries Institute
|
1998
|
nr 2
14

Polichlorowane dibenzo-p-dioksyny [ PCDDs ] i polichlorowane dibenzofurany [ PCDFs ] w kormoranach Phalacrocorax carbo z Zatoki Gdanskiej

51%
Falandysz J., Florek A., Kulp S. E., Strandberg B., Strandberg L., Bergqvist P. A., Rappe C.
Bromatologia i Chemia Toksykologiczna
|
1996
|
tom 29
|
nr 3
267-270
Stosując niedestrukcyjną metodę ekstrakcji i oczyszczania analitu oraz technikę kapilarnej chromatografii gazowej w połączeniu z wysokorozdzielczą sperktrometrią mas (HRGC/HRMS), oznaczono stężenie i skład pozostałości 2,3,7,8-chloro - podstawionych dioksyn (PCDDs) ifuranów (PCDFs) w mięśniach piersiowych i wątrobie trzech dorosłych okazów kormorana czarnego z kolonii koło Kątów Rybackich nad Zatoką Gdańską.
15

Changes in resting and wintering waterfowl populations in Sweden, 1967-1993

51%
Nilsson L.
The Ring
|
1993
|
tom 15
|
nr 1-2
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