Adipose tissue fatty acids suggest spatial and temporal dietary differences in great cormorants of the Baltic Sea area
Autor: | Reijo Käkelä, Alexander Abrahamsson, Karl Lundström, Henry Pihlström, Patrik Tang, Janne Granroth, Malin Tverin |
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Přispěvatelé: | Functional Lipidomics Group, Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Programme, Finnish Museum of Natural History |
Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
INDICATORS SEABIRDS Zoology fishery conflict Aquatic Science PHALACROCORAX-CARBO-SINENSIS VITAMIN-A-2 010603 evolutionary biology 01 natural sciences Predation FISH biology.animal STABLE-ISOTOPES Diet analysis 14. Life underwater SPECIALIZATION SEASONAL-CHANGES chemistry.chemical_classification biology 010604 marine biology & hydrobiology Cormorant Fatty acid SIGNATURE ANALYSIS seabird– Hatchery Food web chemistry population management Fish and Aquacultural Science 1181 Ecology evolutionary biology Fish hatchery lipids (amino acids peptides and proteins) fatty acid Seabird Phalacrocorax carbo Polyunsaturated fatty acid LIPIDS |
Zdroj: | Journal of the Marine Biological Association of the United Kingdom |
Popis: | Increased numbers of great cormorants (Phalacrocorax carbo) in the Baltic Sea may have local impacts on fisheries and salmonid hatcheries. We studied spatial and temporal variability in cormorant diet, and potential consumption of hatchery salmonids, by analysing knee subcutaneous adipose tissue fatty acids (FA) of specimens (N = 77) collected along Swedish and Finnish coasts in different seasons during 2013–2017. The FA profiles of the subspecies sinensis and carbo were similar, with large individual variation. The proportion of C18 polyunsaturated FAs (PUFAs) was the largest in the north, whereas the proportion of C20–22 monounsaturated FAs (MUFAs) increased towards the south, reflecting diminishing freshwater and increasing marine food web characteristics towards the south. As an exception, the C20–22 MUFA percentage was high in sinensis collected in June 2017 from the northern Baltic Sea. The source of C20–22 MUFAs was probably hatchery salmonids, raised on ocean fish hatchery feed and released 10 days before, near the cormorant capture site. The FA profiles of northern and southern cormorants differed from each other both in early and late summer samples, suggesting spatially different diets. The largest individual variation was found in 22:1n-11, characteristic of ocean zooplanktivorous fish, and likely originating from Atlantic wild or Baltic Sea hatchery-reared fish. This study shows that adipose tissue FA profiles can be used as proxies for seabird diet monitoring and indicators of predation on hatchery-reared fish. Obtaining quantitative estimates on the proportions of dietary fish species requires future feeding experiments, allowing calibration between the FA compositions and diet. |
Databáze: | OpenAIRE |
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