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Table 2 Survey effort, detection rate, number of detections, time and date of detections, number of sightings, sea state histogram and percentage of effort surveyed in the hours of darkness for the 2013 harbour porpoise Aegean Sea survey. Acoustic effort was conducted throughout the entire survey regardless of sea state or light level

From: Harbour porpoises in the Aegean Sea, Eastern Mediterranean: the species’ presence is confirmed

Survey/block Acoustic effort (visual effort) km On-track acoustic detections n/100 km (SE of n/100 km) No of detections Date/time of acoustic detection (UTC) No of sightings (individuals) Sea state histogram for daylight hours % of the transect lines surveyed at night (acoustic only)
Low resolution survey 1690 (717) 0.24 (0.17) 4 08/07/2013 06:53:56 4 (9) 48
08/07/2013 13:18:56
08/07/2013 13:32:39
15/07/2013 12:13:32
High resolution survey 1155 (658) 0.87 (0.30) 10 n/a 5 (8) 43
Area 1 255 (150) 0 (0) 0 - 0 41
Area 2 148 (78) 0.68 (0.64) 1 18/07/2013 11:25:38 0 47
Area 3 86 (0) 2.34 (1.35) 2 21/07/2013 23:41:50 0 N/A 100
22/07/2013 00:12:27
Area 4 126 (70) 0.80 (0.80) 1 23/07/2013 17:12:52 0 45
Area 5 351 (179) 0.85 (0.46) 3 24/07/2013 07:01:07 0 49
24/07/2013 09:24:18
24/07/2013 14:53:46
Area 6 54 (65) 5.61 (4.29) 3a 26/07/2013 08:00:05 5 (8) 15
26/07/2013 12:15:48
26/07/2013 14:09:14
Area 7 136 (115) 0 (0) 0 - 0 0
Combined high and low resolution survey results 2845 (1375) 0.49 (0.18) 14 n/a 9 46
  1. a2 off track detections also occurred on 26/07/2013