. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. WINTER POPULATION OF L. PEALEI 209 3 cc UJ Q- o tr LJ CO < UJ. 100 200 DEPTH IN METERS 300 400 FIGURE 5. Mean number of L. pealei per kilogram for samples from the four depth zones in 1967 and 1968. Samples were a minimum of one kilogram in size. Bars represent one standard deviation either side of the means. Dashed lines extend to means of a single sample. data. An arithmetic mean of the untransformed data would be greatly affected by the skewness of the data distribution and more erratic than a log mean. Figure 3 shows
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. WINTER POPULATION OF L. PEALEI 209 3 cc UJ Q- o tr LJ CO < UJ. 100 200 DEPTH IN METERS 300 400 FIGURE 5. Mean number of L. pealei per kilogram for samples from the four depth zones in 1967 and 1968. Samples were a minimum of one kilogram in size. Bars represent one standard deviation either side of the means. Dashed lines extend to means of a single sample. data. An arithmetic mean of the untransformed data would be greatly affected by the skewness of the data distribution and more erratic than a log mean. Figure 3 shows the log mean catches of L. pealei in 1967 and 1968 for each of the nine coastal zones. Moving from southwest to northeast, there were three features in common for these two years: 1. There was a minimum abundance of squid in coastal zone II off of Chesapeake Bay. 2. The maximum abundance occurred in the center of the mid-Atlantic Bight (zone IV 1967; zone V 1968). 3. There were no catches of L. pealei in zone IX, on the eastern end of George Bank. The last observation was supported by nine extra tows made on the eastern end of Georges Bank during the 1968 cruise. Figure 3 indicates a high probability that a single population of L. pealei exists between southern Georges Bank and at least Cape Hatteras in the late winter. Log mean catches of L. pealei in 1967 and 1968 are shown by depth zones in Figure 4. The 1968 data are separated into day and night portions in this figure. Very few squid were taken shallower than 110 m, or over the continental shelf. Peak abundance for the 1968 cruise (and for the two DELAWARE cruises) occurred in the 110-183 m depth zone; the 1967 cruise had an even greater catch in the deepest zone. Neither DELAWARE 67-1 nor CAMERON succeeded in catching. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the o
Size: 1807px × 1383px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
