Seasonal and diel patterns in Black Sea harbour porpoise acoustic activity in 2020-2022

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dc.authoridIvanchikova, Julia/0000-0001-8194-6989
dc.authoridOzsandikci, Ugur/0000-0002-7246-5494
dc.authoridHammond, Philip/0000-0002-2381-8302
dc.contributor.authorIvanchikova, Julia
dc.contributor.authorTregenza, Nick
dc.contributor.authorPopov, Dimitar
dc.contributor.authorMeshkova, Galina
dc.contributor.authorPaiu, Romulus-Marian
dc.contributor.authorTimofte, Costin
dc.contributor.authorOzturk, Ayaka Amaha
dc.date.accessioned2025-03-23T19:47:12Z
dc.date.available2025-03-23T19:47:12Z
dc.date.issued2024
dc.departmentSinop Üniversitesi
dc.description.abstractThe Black Sea is a semi-enclosed inland sea with an unevenly distributed extensive coastal shelf area and anoxic deep waters. It is inhabited by common and bottlenose dolphins, as well as harbour porpoises, all represented by local subspecies. Between September 2020 and October 2022, 19 F-PODs deployed by research teams from Bulgaria, Georgia, Romania, T & uuml;rkiye and Ukraine collected data on acoustic activity of Black Sea harbour porpoises. Strong seasonal and diel patterns were found, which varied in three regions. In the south-eastern part of the Black Sea, harbour porpoise acoustic activity was higher from January to May, with a peak in April. This pattern agrees with the seasonal anchovy migration from the winter spawning grounds in warmer waters in the south-eastern region to feeding grounds on the productive shallow north-west shelf. The diel pattern showed strong nocturnal acoustic activity, which is consistent with anchovy vertical migration. Porpoises on the western side of the Black Sea exhibited a bimodal seasonal pattern in acoustic activity, with a larger peak in April and a smaller one in October. Diel activity was primarily nocturnal. On the north-west shelf, harbour porpoise acoustic activity was mostly recorded during the warm period from April to October. The diel pattern showed activity mainly during daylight with two peaks: a smaller one approximately at dawn and a larger one at dusk. This pattern is similar to the vertical migrations of sprat. Overall, the results of the study were consistent with the prey being an important driver of seasonal and diel dynamics of harbour porpoise acoustic activity. Acoustic activity of harbour porpoises showed strong seasonal and diel patterns on the whole Black Sea basin scale. Patterns differ in different regions and show higher activity in the South and East during winter and higher activity in the Northwest during summer. These patterns could be driven by seasonal and vertical migrations of the main prey species, as well as other factors.image
dc.identifier.doi10.1002/ece3.70182
dc.identifier.issn2045-7758
dc.identifier.issue10
dc.identifier.pmid39391820
dc.identifier.scopus2-s2.0-85206240908
dc.identifier.scopusqualityQ2
dc.identifier.urihttps://doi.org/10.1002/ece3.70182
dc.identifier.urihttps://hdl.handle.net/11486/7309
dc.identifier.volume14
dc.identifier.wosWOS:001333764400001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofEcology and Evolution
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20250323
dc.subjectBlack Sea
dc.subjectdiel patterns
dc.subjectfish
dc.subjectF-POD
dc.subjectGAM
dc.subjectharbour porpoise
dc.subjectmigrations
dc.subjectmovements
dc.subjectprey
dc.subjectseasonal patterns
dc.titleSeasonal and diel patterns in Black Sea harbour porpoise acoustic activity in 2020-2022
dc.typeArticle

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