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References Abel, O. Ein Stammtype der Delphiniden aus dem Miocän der Halbinsel Taman // Jahrbuch K. K. Geolog. Reichs-Anst. — Wien, 1905. — 55 . — S. 375–392. Amano, M., Miyazaki, N. Geographic variation in skulls of the harbor porpoise, Phocoena phocoena // Mammalia. — 1992. — 56 , N 1. — P. 133–144. Barabash-Nikiforov, I. I. Cetacean fauna of the Black Sea, its composition and origin. — Voronezh : Izdatelstvo Voronezhskogo Gosudarstvennogo Universiteta, 1940. — 87 p. — Russian : Барабаш-Никифоров И. И. Фауна китообразных Чёрного моря, её состав и

References Acevedo J., Aguayo-Lobo A., Torres D. Fetus presentation and time taken for parturition in Antarctic fur seal, Arctocephalus gazella, at Cape Shirreff, Antarctica // Polar Biology. - 2008. - 31 . - P. 1137-1141. Baker J. R., Martin A. R. Causes of mortality and parasites and incidental lesions in harbour porpoises (Phocoena phocoena) from British waters // The Veterinary Record. - 1992. - 130 , N 25. - P. 554-558. Blanchet M.-A., Wahlberg M., Ishigami T. First observation of the parturition and peripartum events in a harbor porpoise ( Phocoena

Abstract

The first assessment of cetacean density and abundance by linear transect survey was conducted in 2016 and 2017 in the shallowest coastal area of the Ukrainian sector of the north-western Black Sea, in the Dzharylgach Gulf and the northern Karkinit Gulf, total area up to 259 km2. Three cetacean species were found present in the area in summer, and the harbour porpoise was the most abundant species with the abundance of at least a few hundred animals (estimated as 175 individuals in the Dzharylgach Gulf), whereas the common dolphins (59) and bottlenose dolphins (31) were present in lesser numbers. Common and bottlenose dolphins showed the clearest patterns of habitat preferences, being restricted respectively to the Dzharylgach and the northern Karkinit Gulf; an unusual trait is the preference of the shallowest habitat by common dolphins. Recorded density of harbour porpoises in the Dzharylgach Gulf is among the highest in the whole Black Sea. Thus, the studied area may be an important summer habitat for cetaceans.

References 1. Ferguson B G, Lo K W. Passive and active sonar signal processing methods for port infrastructure protection and harbor security. Journal of the Acoustical Society of America, 2016, 140(4):3350-3350. 2. Wei C, Wwl A, Ketten D R, et al. Biosonar signal propagation in the harbor porpoise’s (Phocoena phocoena) head: The role of various structures in the formation of the vertical beam.. Journal of the Acoustical Society of America, 2017, 141(6):4179. 3. Au W W, Copeland A, Martin S W, et al. Comparing the biosonar signals of free swimming dolphins with

Comparative Neurology , 163 (1), 107-128. Kastelein, R. A., Zweypfenning, R. C., & Spekreijse, H. 1990. Anatomical and histological characteristics of the eyes of a month-old and an adult harbor porpoise (Phocoena phocoena). In Sensory abilities of cetaceans (pp. 463-480). Springer, Boston, MA. Li, J., Wu, Q., and Xiao Y. 1983. Retina of river dolphin Lipotes Vexillifer. Scientia Sinica. Series B, Chemical, biological, agricultural, medical & earth sciences , 26 (2), 145-150. Mass, A., Supin, A. Y., and Severtsov A. 1986. Topographic distribution of sizes and density

RI: Beyond parasitism: Hepatic Lesions in Stranded Harbor Porpoises (Phocoena phocoena) without treated (Campula oblonga) infection. Vet Pathol 2015, 51: 1174-1182. 5. MacSween RNM: Pathology of the liver. 4th ed. New York: Churchill Livingstone London; 2002, 828. 6. Neumann S, Danner W: Reactive Hepatitis in dogs. Glob Vet 2012, 9: 454-459. 7. Jaber JR, Pérez J, Arbelo M, Andrada M, Hidalgo M, Gómez-Villamandos JC, Van den Ingh T, Fernández A: Hepatic lesions in cetaceans stranded in the Canary Islands. Vet Pathol 2004, 41:147-153. 8. Jaber JR, Pérez J, Carrascosa

, 1957. - 756 p. - Russian : Томилин А. Г. Звери СССР и прилежащих стран. Т. 9. Китообразные. Tonay, A. M., Dede, A., Ozturk, A. A., Ozturk, B. Stomach content of harbour porpoises (Phocoena phocoena) from the Turkish Western Black Sea in spring and early summer // Rapport Commission Internationale pour l’Exploration Scientifi que de la Mer Mediterranee. - 2007. - 38 . - P. 616. Zalkin, V. I. Some observations on the biology of the Azov and Black Seas dolphins // Bulletin of Th e Moscow Society of Naturalists, Biology. - 1940. - 49 , N 1. - P. 61-70. - Russian