. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 382 T. WAYNE SCHULTZ AND JOHN R. KENNEDY 100 80- 60- CD O 40- 20- 0 L 0 + (242) X. LOG TEMPERATURE (C) FIGURE 13. Effects of temperature on mobility of 0-24 hr old Daphnia exposed to 10 ppm 3-amino-l,2,4-triazole. A least squares linear regression of corrected % immobility (Y) versus log temperature centrigrade (X). Number in parenthesis equals number of replications. Vertical bars indicate the range. son (1975) who foun'd that, in order to obtain similar rates of immobility at 15 and 20° C, it was nec
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 382 T. WAYNE SCHULTZ AND JOHN R. KENNEDY 100 80- 60- CD O 40- 20- 0 L 0 + (242) X. LOG TEMPERATURE (C) FIGURE 13. Effects of temperature on mobility of 0-24 hr old Daphnia exposed to 10 ppm 3-amino-l,2,4-triazole. A least squares linear regression of corrected % immobility (Y) versus log temperature centrigrade (X). Number in parenthesis equals number of replications. Vertical bars indicate the range. son (1975) who foun'd that, in order to obtain similar rates of immobility at 15 and 20° C, it was necessary to double the amount of herbicide at the lower tem- perature. This may be correlated with a reduction in metabolic rate and longer instar duration at lowered temperatures, since Robertson (1971) reported that the mean first pre-adult instar duration of approximately 50 hr at 15° C was ex- tended to 100 hr when the temperature was reduced to 10° C. Thus, at 12° C no animals would be expected to reach ecdysis (in fact even after 48 hr exposure), while at 16° C those animals which became immobile could represent the number reaching ecdysis. The time lag between projected time of ecdysis and time of immobility may be explained by a change in metabolic rate suggested by behavior changes which more closely approximate ecdysis. The effect of 3-amino-l,2,4-triazole on plants has been extensively studied. It is readily absorbed through the foliage or roots and translocated throughout the plant (Ashton and Crafts, 1973). It causes chlorosis and inhibits regrowth from buds (Ashton and Crafts, 1973; for more in depth study see Hall, Johnson and Leinweber, 1954). Chlorosis is apparently due to the triazole interfering with light-induced changes in the proplastid resulting in a reduction in chlorophyll. 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 n
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
