Acoustical study of the prey field and supporting food web for whales in the Ligurian Sea north of Corsica.

Autor: McGehee, Duncan E., Demer, David A.
Zdroj: Journal of the Acoustical Society of America; 2000, Vol. 108 Issue 5, p2488-2489, 2p
Abstrakt: The Sound, Oceanography, and Living Marine Resources (SOLMAR) program is a study coordinated by the NATO SACLANT Undersea Research Centre to develop ways of mitigating risks to whales from anthropogenic sound sources. One objective of the SOLMAR program is to examine the correlation between the distribution of whales in parts of the Mediterranean Sea and that of their prey, lower trophic levels, and basic oceanographic parameters. A multiship field study was conducted in the Ligurian Sea north of Corsica in August 1999, as will be a follow-up study in August 2000. The primary role of the R/V Ammiraglio Magnaghi is to map basic physical oceanographic parameters with a CTD; phytoplankton with a fluorometer; small zoo-plankton (copepods and smaller) with a six-frequency TAPS (Tracor Acoustic Profiling System) and small plankton net; and large zooplankton (euphausiids and larger) with a 120-kHz split-beam echosounder. Measurements in 1999 were consistent with a counterclockwise circulation in the basin causing Ekman pumping of nutrients in the center. Phytoplankton were concentrated in the center, small zooplankton were around the periphery, and larger zooplankton were associated with the shelf break and basin center. Results from the two field seasons will be discussed and compared. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index