New Zealand fur seal demographics

Open Bay Islands, 2001

Mark-recapture estimate, 02–03 Feb 2001

Total marked
549
Mean estimate
931.1
Range
898.7 – 953.1

Mark-recapture counts

Count number Date Time Sector Unmarked count Marked count Dead marked Dead unmarked Total marked Cum. dead Estimate?
1 02 Feb 2001 10:45 – 10:46 Sector 1 1 -
02 Feb 2001 10:47 – 11:06 Sector 2 5 15
02 Feb 2001 11:10 – 11:42 Sector 3 23 38
02 Feb 2001 11:45 – 12:57 Sector 4 25 38
02 Feb 2001 12:38 – 13:16 Sector 5 34 40
02 Feb 2001 13:17 – 13:59 Sector 6 23 27
02 Feb 2001 15:38 – 15:51 Sector 7 29 32
All sectors 140 190 - 1 549 1 953.1
2 02 Feb 2001 17:15 – 17:17 Sector 1 2 -
02 Feb 2001 17:18 – 17:31 Sector 2 2 21
02 Feb 2001 17:38 – 18:00 Sector 3 44 55
02 Feb 2001 18:08 – 18:50 Sector 4 42 55
02 Feb 2001 18:52 – 19:19 Sector 5 25 34
02 Feb 2001 19:26 – 19:58 Sector 6 20 37
02 Feb 2001 16:00 – 16:13 Sector 7 31 36
All sectors 166 238 - - 549 1 932.0
3 03 Feb 2001 10:04 – 10:06 Sector 1 3 -
03 Feb 2001 10:07 – 10:21 Sector 2 6 30
03 Feb 2001 10:28 – 10:56 Sector 3 42 39
03 Feb 2001 11:08 – 11:46 Sector 4 20 37
03 Feb 2001 11:48 – 12:15 Sector 5 32 46
03 Feb 2001 12:23 – 13:01 Sector 6 22 50
02 Feb 2001 16:20 – 16:31 Sector 7 24 32
All sectors 149 234 - - 549 1 898.7
4 03 Feb 2001 16:03 – 16:05 Sector 1 2 -
03 Feb 2001 15:45 – 16:02 Sector 2 8 18
03 Feb 2001 15:20 – 15:42 Sector 3 48 51
03 Feb 2001 14:34 – 15:14 Sector 4 24 55
03 Feb 2001 14:07 – 14:31 Sector 5 29 31
03 Feb 2001 13:28 – 14:04 Sector 6 23 34
02 Feb 2001 20:17 – 20:39 Sector 7 31 51
All sectors 165 240 - - 549 1 926.6
5 03 Feb 2001 16:30 – 16:32 Sector 1 3 -
03 Feb 2001 16:33 – 16:47 Sector 2 7 18
03 Feb 2001 16:58 – 17:27 Sector 3 54 56
03 Feb 2001 17:39 – 18:15 Sector 4 25 40
03 Feb 2001 18:16 – 18:47 Sector 5 34 36
03 Feb 2001 18:49 – 19:45 Sector 6 19 47
03 Feb 2001 19:57 – 20:14 Sector 7 39 54
All sectors 181 251 - - 549 1 945.0

Dead count, 29–31 Jan 2001

Count
94

Dead counts

Date Sector Fresh Decomposing Dry Count
29–31 Jan 2001 Sector 1 - - - -
29–31 Jan 2001 Sector 2 1 1 - 2
29–31 Jan 2001 Sector 2a 1 1 - 2
29–31 Jan 2001 Sector 3 2 6 - 8
29–31 Jan 2001 Sector 4 3 13 6 22
29–31 Jan 2001 Sector 5 2 7 7 16
29–31 Jan 2001 Sector 6 1 7 4 12
29–31 Jan 2001 Sector 7 4 11 17 32
All sectors 14 46 34 94