. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 150 Bulletin Muscunt of Comparative Zooloay, Vol. 134, No. 5. 802 803 804 805 806 807 808 809 810 Fig. 5. Temperature vs. depth along the collection transect constructed from bathythermograph observations. represented equally. The incidence of num- bers in diis community was made to resem- ble the incidence (number of collections in which a species occurred) of species in the CHAIX-17 samples. Fourteen consecutive drawings of numbers were made and the numbers of first-time captines noted with each successive drawi
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 150 Bulletin Muscunt of Comparative Zooloay, Vol. 134, No. 5. 802 803 804 805 806 807 808 809 810 Fig. 5. Temperature vs. depth along the collection transect constructed from bathythermograph observations. represented equally. The incidence of num- bers in diis community was made to resem- ble the incidence (number of collections in which a species occurred) of species in the CHAIX-17 samples. Fourteen consecutive drawings of numbers were made and the numbers of first-time captines noted with each successive drawing. (It was deter- mined that 23 numbers were needed to be drawn to assure that, on the average, about 21 different ones would be drawn on the first sampling.) The whole procedure was repeated six times. Mean values from these six trials were calculated for first-time cap- tures for samplings 1-14. These mean values are plotted in Figure 6 with a curve fitted by eye. Since this distribution of first- time captures does not differ greatly from that for the simpler model, since a number of poor assumptions must be made in the design of the community of numbers in the complex model, and since we have not been able to calculate (but must detennine empirically) the distribution of first-time captures in the complex one, we have con- tented ourselves with the simple distribu- tion. ^^^hen the order of the ajs computed from the simple model is reversed, the numbers correspond to 14 successive values of b(, the expected number of last-time captures with successive samplings (Table 2, Col. 8). From a, for a collection and b, for the collection in arrears, the value a, + h, was obtained for each collection in- terval (Table 2, Col. 9). Comparisons were then made individually between expected values for collection intervals and those observed, using the chi-square test and ob- taining probability levels based on single degrees of freedom. The deviations of the observed from the expected v
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