. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. RESULTS Migration Peaks and Offshore IVIovements The picture of migration peaks ob- tained from the aerial surveys agrees with the summaries of Hubbs (1459) and Gilmore (1960). The earliest animals were seen in the third week of December and the latest during late May. The largest numbers of animals were seen during the first and second weeks of January and the sec- ond and fourth weeks of Mar
. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. RESULTS Migration Peaks and Offshore IVIovements The picture of migration peaks ob- tained from the aerial surveys agrees with the summaries of Hubbs (1459) and Gilmore (1960). The earliest animals were seen in the third week of December and the latest during late May. The largest numbers of animals were seen during the first and second weeks of January and the sec- ond and fourth weeks of March. Be- cause the amount of aerial survey effort varied from month to month, indices of apparent abundance were computed for data in blocks of a month by dividing both the number of aerial observations and the number of individuals seen by the amount of survey effort during that time period. These indices (Figure 4) also clearly indicate the periods of greatest abun- dance off San Diego as January and March. During both legs of the migration many whales were sighted far offshore. (Figure 5) presumably taking what has been called the "inter-island leg" (Gilmore. 1969). For instance, with- in the 64 km wide band between lat. 32°I5'N and 32°55'N. southern mi- grating gray whales were encountered during percent of the flights in the first 80 km from shore. percent of the flights in the second 80 km. and 1 percent of the flights over the next 48 km. Similarly on the northern migration, grays were sighted , and percent respectively of the times the three zones were sur- veyed. These findings support the con- tentions of Rice (1965) and Rice and Wolman (197 1) that at least since 1965 a rather high percentage of the whales have passed offshore, out of sight of Point Loma. Though most of the animals taking the offshore route apparently strike for the coast shortly after they pass bv the southernmost of the Channel TOTAL DBS
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