Characteristics of the grey seal (Halichoerus grypus) diet in the Vistula River mouth (Mewia Łacha Nature Reserve, southern Baltic Sea), based on the osteological and molecular studies of scat samples

• Autorzy: Keszka Sławomir , Panicz Remigiusz , Stepanowska Katarzyna , Biernaczyk Marcin , Wrzecionkowski Konrad , Zybała Mikołaj

Identyfikatory

DOI

10.1016/j.oceano.2020.04.005

• Języki publikacji: EN

Abstrakty

EN

The study analyses for the first time the diet composition of grey seals inhabiting the Polish Baltic Sea coast. Samples of seal scat were collected in the Mewia Łacha Nature Reserve at the mouth of the Vistula River. Using genetic and osteological methods, the remains of organisms included in the grey seals diet were analysed for their taxonomy (families and species). Based on the analysis of 49 scat samples from grey seals, 761 hard parts that could be identified by taxon were isolated. The predominant species in the samples were perch, Perca fluviatilis (almost 78% of samples); pikeperch, Sander lucioperca (67%); lamprey, Lampetra fluviatilis (almost 35% of samples); Baltic cod, Gadus morhua callarias (almost 31% of samples) and sea trout, Salmo trutta trutta (26.5%). Genetic analysis confirmed the presence of Atlantic cod DNA in 69% and sea trout in 63% of samples. The genetic material of the Atlantic herring, Clupea harengus has not been identified in the analysed scat samples. Information on grey seals feeding on river lampreys seems to be valuable in the context of lack of knowledge on the occurrence of lampreys in the Vistula River. The methodology used showed that seals fed on species that were the most abundant in the area which is directly associated with the migration cycle of fish. The results of our study allowed the conclusion that the grey seal is an opportunistic predator and its diet reflects and exploits the variations in its habitat.

Słowa kluczowe

EN

diet of marine mammals; DNA barcoding; fish species identification; Lampetra fluviatilis; grey seal; Halichoreus grypus

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2020
• Tom: No. 62 (3)
• Strony: 387--394
• Opis fizyczny: Bibliogr. 34 poz., fot., mapa, tab.

Twórcy

autor

Keszka Sławomir

• Department of Aquatic Bioengineering and Aquaculture, Faculty of Food Science and Fisheries, West Pomeranian University of Technology, Szczecin, Poland

autor

Panicz Remigiusz

• Department of Meat Sciences, Faculty of Food Science and Fisheries, West Pomeranian University of Technology, Kazimierza Królewicza 4, 71-550 Szczecin, Poland

autor

Stepanowska Katarzyna

• Department of Aquatic Bioengineering and Aquaculture, Faculty of Food Science and Fisheries, West Pomeranian University of Technology, Szczecin, Poland

autor

Biernaczyk Marcin

• Department of Aquatic Bioengineering and Aquaculture, Faculty of Food Science and Fisheries, West Pomeranian University of Technology, Szczecin, Poland

autor

Wrzecionkowski Konrad

• Wolin National Park, Międzyzdroje, Poland

autor

Zybała Mikołaj

• Laureate of the Duke/Oak Foundation 2013 Mini-grants in Marine Conservation, Marine Laboratory, Nicholas School of Environment, Duke University, Beaufort, N.C., USA

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