European Directory of Marine Environmental Data (EDMED)

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General
Data set name

Cetacean Distribution in Southern Black Sea (2014)

Data holding centreInstitute of Marine Sciences, Middle East Technical University
CountryTurkey  Turkey
Time periodJuly and October 2014
OngoingNo
Geographical area

Southern Black Sea

Observations 
Parameters

Cetacean behaviour; Cetacean abundance; Acoustic backscatter in the water column

Instruments

Observers; Fish-finder echosounders

Description 
Summary

Large numbers of small cetaceans had been hunted in the Black Sea until hunting cetaceans was banned in Turkey starting in 1983. Even though hunting cetaceans had been ceased by Turkish fleets, cetacean populations had not recovered fully due to many other stressors present in their habitat. There are still ongoing threats such as seismic surveys conducted for petroleum, natural gas and hydrocarbon exploration, overfishing and pressure from fishermen for the repeal of the hunting ban. One of the most striking reasons why any action cannot be taken to overcome these stressors and threats is the insufficient knowledge about the importance of the issue. This study aims to play significant role in conservation of these species evaluating the abundance and distribution data it provides about Black Sea cetaceans. To fulfill this role, during the monthly cruises held in July and October 2014, active and passive acoustics methods were performed over transects covering up to 120 miles off the Black Sea coast of Turkey. For the active acoustics, tree transducers (38kHz, 120kHz and 200kHz, SIMRAD EK60, Scientific echo sounder, SIMRAD EK System) were operated continuously over the cruise transects. For the passive acoustics, C-POD (Chelonia Ltd., Cetacean Monitoring Systems) was deployed on the 93 stations. Dolphin presence in echograms were validated with cetacean observation data. Then, normalization and generalization of dolphin sounds was performed using the Echoview software (Echoview Sound Knowledge, copyright 1997-2014 Myriax Software Pty Ltd). C-POD data was used both for validation of cetacean species and characterization of cetacean vocalizations. Parameters: Observation (mainly on group size, species and behavior), Fisheries acoustics (echograms), C-POD acoustics (sound characteristics of click trains like SPL, frequency, bandwidth..etc) Instruments: Nikon ACULON A211 10-22x50 binoculars, three scientific echo-sounders (38kHz, 120kHz and 200kHz, SIMRAD EK60, Scientific echo sounder, SIMRAD EK System), CPOD (Chelonia Ltd., Cetacean Monitoring Systems)

OriginatorsInstitute of Marine Sciences, Middle East Technical University
Availability 
OrganisationInstitute of Marine Sciences, Middle East Technical University
AvailabilityOrganisation
ContactGulce Saydam (Researcher)
Address

Institute of Marine Sciences, Middle East Technical University
P.O.Box 28
Erdemli
Mersin
33731
Turkey

Telephone+90 (324) 5212406
Facsimile+90 (324) 5212327
Emailg.saydam7@gmail.com
Administration 
Collating centreInstitute of Marine Sciences, Middle East Technical University
Local identifier40001017
Global identifier6167
Last revised2015-05-20