Table 2. Long-term dataset and basic statistic of gray whale survey counts conducted during the month of February at OLL.
Mean: sum of the total number of whales counted during all the surveys conducted during February divided by the total number of surveys conducted in that month (total whales/total surveys); SD: standard deviation; Max: survey with the maximum number of mother-calf pairs counted; Min: survey with the minimum number of mother-calf pairs counted.
| Total | Number of Mother-calf pairs | |||||
|---|---|---|---|---|---|---|
| Year | Surveys | Mean | Mean+SD | Mean-SD | Max | Min |
| 1980 | 557 | |||||
| 1981 | 525 | |||||
| 1982 | 553 | |||||
| 1983 | 463 | |||||
| 1985 | 2 | 487 | 507 | 467 | 502 | 473 |
| 1987 | 3 | 447 | 572 | 322 | 534 | 303 |
| 1988 | 6 | 74 | 90 | 58 | 95 | 54 |
| 1989 | 5 | 71 | 86 | 56 | 91 | 49 |
| 1996 | 6 | 422 | 487 | 357 | 512 | 360 |
| 1997 | 3 | 538 | 619 | 457 | 626 | 466 |
| 1998 | 1 | 530 | 530 | 530 | ||
| 1999 | 2 | 165 | 233 | 96 | 213 | 116 |
| 2000 | 4 | 229 | 260 | 197 | 256 | 196 |
| 2001 | 2 | 216 | 229 | 202 | 225 | 206 |
| 2002 | 4 | 424 | 484 | 364 | 475 | 361 |
| 2003 | 3 | 363 | 403 | 322 | 401 | 367 |
| 2004 | 3 | 697 | 863 | 531 | 889 | 601 |
| 2005 | 4 | 696 | 837 | 555 | 841 | 508 |
| 2007 | 2 | 247 | 270 | 224 | 263 | 231 |
| 2008 | 4 | 256 | 327 | 184 | 344 | 187 |
| 2009 | 4 | 303 | 343 | 263 | 335 | 245 |