Acoustically measured diurnal vertical migration of fish and zooplankton in the Baltic Sea -- seasonal variations

• Autorzy: Szczucka Joanna
• Języki publikacji: EN

Abstrakty

EN

Acoustic measurements were conducted at different seasons in the last five years at a fixed point of the Baltic Sea at a frequency 30 kHz concurrently with temperature and salinity sampling. Echosounding records were used to determine the seasonal and diurnal migration patterns of scattering layers in accordance with thermohaline conditions. Different seasonal patterns of nocturnal aggregations of organisms dependent on the temperature gradient in the thermocline were found. This paper illustrates the diurnal distributions of sound scattering layers and analyses the way they are linked to the physical structure of the water.

Słowa kluczowe

EN

sound scattering layers; diurnal vertical migration; Baltic Sea

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2000
• Tom: No. 42 (1)
• Strony: 5--17
• Opis fizyczny: Bibliogr. 8 poz., wykr.

Twórcy

autor

Szczucka Joanna

• Institute of Oceanology, Polish Academy of Sciences

• Institute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, PL-81-712 Sopot, Poland,

Bibliografia

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• 2. Clay C. S., Medwin H., 1977, Acoustical oceanography, John Wiley & Sons, New York, 544 pp.
• 3. Everson I., 1982, Diurnal variations in mean volume backscattering strength of an Antarctic krill (Euphausia superba)patch, J. Plankton Res., 4 (1), 155-162.
• 4. Iida K., Mukai T., Hwang D., 1996, Relationship between acoustic backscattering strength and density of zooplankton in the sound-scattering layers, ICES J. Mar. Sci., 53, 507-512.
• 5. Orłowski A., 1996, Diel variations of acoustic properties of the Baltic fish, Proceedings of the 13th Symposium on Hydroacoustics, Gdynia–Jurata, 35-48.
• 6. Plueddemann A. J., Pinkel R., 1989, Characterization of the patterns of diel migration using a Doppler sonar, Deep-Sea Res., 36 (4), 509-530.
• 7. Szczucka J., 1997, Analysis of diurnal variability of the Baltic sound scattering layers, International Symposium on Hydroacoustics and Ultrasonics, EAA Symp., Gdańsk–Jurata, 109-114.
• 8. Szczucka J., Klusek Z., 1996, Migration patterns of acoustic scatterers in the southern Baltic Sea, Oceanologia, 38 (1), 61-79