By M. J. Keen and J. A. Jacobs (Auth.)
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Extra info for An Introduction to Marine Geology
Gregana, are considered limiting for the purpose of the extrapolation. With warming (b), the 7°C isotherm (at the high-latitude boundary) moves to position of present 4-5°C isotherm, and the 11 °C isotherm (at the low latitude boundary) moves to position of present 8-5°C isotherm. With cooling (c) the limiting 7°C and 11°C isotherms move to positions of present 9-5°C and (152) 13-5°C isotherms, respectively (after M. W. Johnson and E. B r i n t o n ) . abundant in the colder conditions. Bradshaw also observes that the laboratory studies indicating that particular species thrive best under particular environmental conditions are reflected in the oceans them- Pelagic Sediments ( 3 0) 59 selves.
If the temperature of the oceans has been generally lower the now-isolated groups of this euphausiid would form a single population as shown in Fig. 4. An empirical approach has more, though not complete success; here an attempt is made to relate the plankton observed living in the sea with the skeletal remains in the surface sediment beneath. ) Among a number of studies of this nature is one in which a close relationship was established between the diatom biocoenoses and thanatocoenoses in the western ( 1 5 3) There is correspondence between the living part of the Bering S e a .
56 An Introduction to Marine Geology If we are to use the skeletons of these micro-organisms to determine past océanographie conditions, then there must be assurance that the present distribution on the ocean floor reflects with sufficient accuracy the distribution in the water masses above. The organisms must also be sensitive to changes in the properties of the water masses, to the temperature of the water at the surface, for example, and the relationship between the changes that are found in the organisms and the properties of the water must be known.