much smaller surveyed area. However, marine mammals were well represented,
with the exception of P.P. relicta.
The area in which the observations were carried out in May 2013 by boat was
about 765 km
2 and represented 31% of the total surface area taken into account
(2450 km
2 ) for the purpose of estimating cetacean abundance. By means of
extrapolation, it was estimated that the number of marine mammals present in the
Fig. 27.7 Total number of cetaceans by species (by vessel, May 2013)
0
P.phocoena T.truncatus
Northern area
Central area
Southern area
D.delphis
10
20
30
40
Dolphins distribution by species in the three sectors of the
Romanian coast
(may 2013)
Northern area
Central area
Southern area
Fig. 27.8 Cetacean
distribution by species and
sectors (by vessel, May
2013)
27 Assessment of Cetacean Population Abundance at the Romanian Black Sea. . .
479