. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 470 A. C. REDFIELD AND ALICE BEALE time during which the water has been exposed to these processes. Tem- perature and salinity are thus a function of the age of the deep water in the Gulf. The abscissa of Fig. 8 may be replaced by a time scale read- ing from right to left and measuring in a general way the time since the water with its included population entered the Gulf. With these considerations in mind, the curves in Fig. 8 may be in- terpreted as probability integrals representing the expectancy of life of the groups of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 470 A. C. REDFIELD AND ALICE BEALE time during which the water has been exposed to these processes. Tem- perature and salinity are thus a function of the age of the deep water in the Gulf. The abscissa of Fig. 8 may be replaced by a time scale read- ing from right to left and measuring in a general way the time since the water with its included population entered the Gulf. With these considerations in mind, the curves in Fig. 8 may be in- terpreted as probability integrals representing the expectancy of life of the groups of chaetognaths which appear in the Eastern Channel. E. hamata has an expectancy of longer life than the others. Hence it has time to be carried into the remoter parts of the Gulf in large numbers 100 © = E. HAMATA = S. MAXIMA = S. LYRA. 3 4 10 °C FIG. 8. Percentage of the total catcli of Eitkrohnia hamata, Sagitta maxima and 5. lyra taken at stations at which the water below 100 meters was colder than the temperature shown on the abscissa. Based on integrated percentages shown in Tables II and III. before it dies. Why its expectancy is longer may depend merely on its inherent longevity. It may, however, depend on its relative age> at the time when it enters the Gulf. For the latter alternative there is some evidence, for we have found that young individuals of this species ap- pear in the eastern side of the basin during the winter months (Fig. 4). This interpretation renders any special considerations of the relative fitness of the environment for the three species unnecessary, though it does not exclude them as contributory causes. The distribution within the Gulf appears to depend essentially upon the current system and upon the age of the population which enters the region. This in turn must depend upon the relative remoteness from. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
