. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 198 HILARY B. MOORE bution patterns obtained must be considered significant as a whole rather than in detail. From observations at Bermuda, which are summarized in Figure 19, and from the results of Leavitt (1935, 1938) and Waterman et d. (1939), we are probably correct in arranging the common species of the area in the following order of increas- ing depth of day level: Euphausia tenera, E. brevis, E. hcmigibba, Thysanopoda aeqiialis. Thysanoessa gregaria. Ruud (1936) confirms the fact that E. hcmigibba lives deeper than E.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 198 HILARY B. MOORE bution patterns obtained must be considered significant as a whole rather than in detail. From observations at Bermuda, which are summarized in Figure 19, and from the results of Leavitt (1935, 1938) and Waterman et d. (1939), we are probably correct in arranging the common species of the area in the following order of increas- ing depth of day level: Euphausia tenera, E. brevis, E. hcmigibba, Thysanopoda aeqiialis. Thysanoessa gregaria. Ruud (1936) confirms the fact that E. hcmigibba lives deeper than E. brevis, and that T. gregaria, though very variable, is a deep form. E. amcricana is believed to be a shallow form, comparable with E. brews or E. tenera. 100- O a. UJ o 200- 300- EUPHAUSIA HEMIGIBBA THYSANOPODA AEQUALIS. FIGURE 19. Vertical distribution of the commoner species of euphausids off Bermuda, from hauls made in the middle of the day. E. krohnii also is probably comparable with E. brevis, and Nematoscelis incgalops is deeper. Stylocheiron spp. rarely form a large proportion of the catches. Some of them are very shallow species, and so were taken in a sufficient number of Ber- muda hauls to yield fairly accurate knowledge of their distribution. Of these, S. snhm-i has a mean day level of 25 fathoms, S. carinatnm of 44 fathoms, and 5. ab- breviatum of 57 fathoms. Temperature and illumination—sources of data. Temperature data have been obtained from the nearest hydrographic station, supplemented where needed by the shallower but more numerous bathythermograph records. The latter were made at the same time as the scattering layer and net haul records, as were those at the. 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 original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory
Size: 2005px × 1246px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
