Emphasis on publishing as a means of "spreading knowledge" was expressed by the first secretary of the Smithsonian. Abundance was greater in the warmest, shallow, central part of the eddy than in the deeper, peripheral parts of the eddy. One such vortex occupied the dump during cruise 2, with its center just northeast of the dump (about 39°45'N, 71°55'W).
Eddy at the dump was arbitrarily divided into an eastern region in the core of the vortex and a western region in the periphery of the vortex (Figure 5). The amount of strained water per unit of time may have varied considerably due to fluctuations in ship speed and the amount of clogging of the net. Another factor affecting the quantitative reliability of the cruise 2 samples is the patchy distribution of T.
The base of the triangle encompasses the depth range sampled; the peak shows the duration of the drag and is read from the abscissa. If almost the entire vertical spectrum of the populations was sampled, as seems likely, it must be concluded. The greatest numbers of Themisto were taken in shallow tows, with the majority of specimens collected above 125 m. and 92% of specimens in the eastern and western eddies respectively being caught between 125 m and the surface.
Only a small part of the population lived below the isothermal layer of 15°-16°C; in the eastern gyre, 98% of nocturnal specimens were collected between 300 m and the surface. About 1/3 of the eastern Eddy Night samples (34%) occurred in the 0–25 m layer, above the isothermal layer. Outside the core, which lies in the eastern gyre, the anticyclonic motion of the water tends to deflect particles.
An opposing view, however, is that water is drawn into the outer edges of the vortex and is lost at the surface. It cannot be determined whether any of the above explanations were operative for Themisto abundance. Studies of the waters of the continental shelf, Cape Cod to Chesapeake Bay, III: A volumetric study of the zooplankton.
Zooplankton from the Mid-Atlantic Bight: Second year results and a discussion of the two-year BLM-VIMS survey. Stages in the early development of Parathemisto gaudichaudii (Guer.), (Crustacea Amphipoda: Hyperiidea): The development of the secondary sexual characters and of the ovary. The distribution of Parathemisto gaudichaudii (Guer.), with observations on its life history in the 0° to 20° E sector of the Southern Ocean.
Report on the distribution of plankton in the neighboring sea of Tyosen in June 1932.
DAY . NIGHT
NIGHT K2.17 9
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