Abundance estimates of cetaceans in coastal waters of the northern Black Sea : results of boat surveys in August-October 2003

  • Birkun A
  • S.V. K
  • D.M. G
 et al. 
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Abstract

The utilization of the method of linear transects (Buckland et al. 1993) has a brief history, and it so far has covered only small areas. In the October, 1997 and the August, 1998, this technique was used in surveys of common dolphins (Delphinus delphis) and bottlenose dolphins (Tursiops truncatus) from board the ship in Bosporus (Dede 1999; quoted after the Report… 2003). In the July 2001 and August, 2002, aircraft surveys of harbor porpoises (Phocoena phocoena) and bottlenose dolphins, covering the entire water area of the Azov Sea and the Kerch Strait, and also the zone of the northeastern shelf of the Black Sea from Cape Chauda near Feodosia in the Crimea to Dagomys, Sochi in the Caucasus (Birkun et al. 2002, 2003) were conducted. In the latter case flights by super-light amphibian aircraft were performed over the coastal water area limited by the isobath 200 m, which corresponds to the distance from the shore of 7-64 km. In the other regions of the Black Sea, the linear transect method was not used in estimating dolphin abundance. In

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Authors

  • Alexei Jr. Birkun

  • Krivokhizhin S.V.

  • Glazov D.M.

  • Shpak O.V.

  • Zanin A.V.

  • Mukhametov L.M.

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