New Zealand fur seal demographics

Open Bay Islands, 2008

Mark-recapture estimate, 02–03 Feb 2008

Total marked
849
Mean estimate
1209.9
Range
1168.2 – 1228.9

Mark-recapture counts

Count number Date Time Sector Unmarked count Marked count Dead marked Dead unmarked Total marked Cum. dead Estimate?
1 02 Feb 2008 08:25 – 08:27 Sector 1 8 -
02 Feb 2008 08:28 – 08:38 Sector 2 2 25
02 Feb 2008 08:42 – 09:12 Sector 3 31 51
02 Feb 2008 09:16 – 09:34 Sector 4a 5 34
02 Feb 2008 09:40 – 09:55 Sector 4b 19 42
02 Feb 2008 09:58 – 10:16 Sector 5 18 69
02 Feb 2008 10:22 – 10:28 Sector 6a 14 23
02 Feb 2008 10:29 – 10:44 Sector 6b beach 21 52
02 Feb 2008 10:50 – 10:56 Sector 6c 4 4
02 Feb 2008 11:05 – 11:17 Sector 7 41 82
All sectors 163 382 1 3 848 4 1213.3
2 02 Feb 2008 17:00 – 17:03 Sector 1 3 -
02 Feb 2008 16:47 – 16:58 Sector 2 1 17
02 Feb 2008 16:15 – 16:33 Sector 3 34 55
02 Feb 2008 15:47 – 16:09 Sector 4a 16 58
02 Feb 2008 15:23 – 15:45 Sector 4b 23 50
02 Feb 2008 15:00 – 15:20 Sector 5 23 56
02 Feb 2008 14:48 – 14:58 Sector 6a 10 15
02 Feb 2008 14:28 – 14:47 Sector 6b beach 27 58
02 Feb 2008 14:17 – 14:26 Sector 6c 6 4
02 Feb 2008 11:30 – 11:49 Sector 7 35 87
All sectors 178 400 - - 848 4 1228.9
3 02 Feb 2008 20:32 – 20:35 Sector 1 8 -
02 Feb 2008 20:19 – 20:31 Sector 2 2 25
02 Feb 2008 19:50 – 20:10 Sector 3 36 77
02 Feb 2008 19:21 – 19:35 Sector 4a 12 40
02 Feb 2008 19:00 – 19:20 Sector 4b 18 37
02 Feb 2008 18:31 – 18:58 Sector 5 25 70
02 Feb 2008 18:13 – 18:28 Sector 6a 17 44
02 Feb 2008 17:59 – 18:11 Sector 6b beach 15 36
02 Feb 2008 17:51 – 17:58 Sector 6c 2 2
02 Feb 2008 12:06 – 12:24 Sector 7 38 71
All sectors 173 402 2 - 846 6 1215.6
4 03 Feb 2008 07:20 – 07:22 Sector 1 4 -
03 Feb 2008 07:25 – 07:35 Sector 2 4 19
03 Feb 2008 07:38 – 07:59 Sector 3 31 62
03 Feb 2008 08:10 – 08:27 Sector 4a 5 31
03 Feb 2008 08:34 – 08:52 Sector 4b 23 45
03 Feb 2008 08:55 – 09:13 Sector 5 18 72
03 Feb 2008 09:20 – 09:44 Sector 6a 18 43
03 Feb 2008 09:45 – 09:54 Sector 6b beach 14 25
03 Feb 2008 10:00 – 10:04 Sector 6c 4 1
02 Feb 2008 12:44 – 13:03 Sector 7 47 84
All sectors 168 382 - - 846 6 1223.5
5 03 Feb 2008 13:11 – 13:13 Sector 1 4 -
03 Feb 2008 12:59 – 13:10 Sector 2 2 21
03 Feb 2008 12:30 – 12:56 Sector 3 37 60
03 Feb 2008 12:07 – 12:21 Sector 4a 6 36
03 Feb 2008 11:50 – 12:05 Sector 4b 13 48
03 Feb 2008 11:30 – 11:48 Sector 5 10 57
03 Feb 2008 11:07 – 11:29 Sector 6a 17 41
03 Feb 2008 10:57 – 11:06 Sector 6b beach 10 26
03 Feb 2008 10:50 – 10:55 Sector 6c 3 1
02 Feb 2008 13:25 – 13:50 Sector 7 32 68
All sectors 134 358 - - 846 6 1168.2

Dead count, 28–31 Jan 2008

Count
53

Dead counts

Date Sector Fresh Decomposing Dry Count
28–31 Jan 2008 Sector 2 - - - -
28–31 Jan 2008 Sector 3 - 1 5 6
28–31 Jan 2008 Sector 4a 1 3 1 5
28–31 Jan 2008 Sector 4b 1 3 6 10
28–31 Jan 2008 Sector 5 - - 2 2
28–31 Jan 2008 Sector 6a 1 - 1 2
28–31 Jan 2008 Sector 6b beach 1 1 - 2
28–31 Jan 2008 Sector 6b hdland - 1 3 4
28–31 Jan 2008 Sector 6c - - - -
28–31 Jan 2008 Sector 7 2 6 14 22
All sectors 6 15 32 53