. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOT-LD HOT-SD COLD-LD COLD-SD TREATMENT Figure 1. The effect of temperature and photopenod regimes on the mean number of free-living copepods ( not encysted). The duration of the experiment was 23 weeks. Treatments: Cold, 10°C, Hot, 20°C; LD (long day). \5 h light:9 h dark; SD (short day). 9 h light: 15 h dark. Error bars are one standard deviation of mean. O u. O cc LU CO < LU. HOT-LD HOT-SD COLD-LD TREATMENT COLD-SD Figure 2. The effect of temperature and photopenod regimes on the mean number of full and empty cyst
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HOT-LD HOT-SD COLD-LD COLD-SD TREATMENT Figure 1. The effect of temperature and photopenod regimes on the mean number of free-living copepods ( not encysted). The duration of the experiment was 23 weeks. Treatments: Cold, 10°C, Hot, 20°C; LD (long day). \5 h light:9 h dark; SD (short day). 9 h light: 15 h dark. Error bars are one standard deviation of mean. O u. O cc LU CO < LU. HOT-LD HOT-SD COLD-LD TREATMENT COLD-SD Figure 2. The effect of temperature and photopenod regimes on the mean number of full and empty cysts. The duration of the experiment was 23 weeks, and treatment conditions are as listed in the legend to Figure 1. Error bars are one standard deviation of mean. month, as well as the number of females compared to males, were also compared using the GLM procedure (1- way ANOVA, month vs. total) and Tukey's multiple comparison procedure. All significance levels were set at alpha < Results Laboratory environmental cues experiment A. Free-living Heteropsyllus nunni. The final mean numbers of free-living H. nunni in the four experimental treatments were not significantly different (P = ; 1- way ANOVA, final number of free-living animals vs. treatment). Although the total mean in the Hot-SD treat- ment was slightly more than double the mean in the Hot- LD (Fig. 1), the great variability within treatment masked any significant difference. There were no significant dif- ferences between the number of free-living males com- pared to free-living females among treatments, again due to high variability within treatment. B. Encysted H. nunni. Sixteen culture dishes within each treatment represented five different life-history stages. The frequency of encystment events (at least one cyst in a dish) was surprisingly high (69%) in all four treatments. Frequency of encystment events in all dishes (16 total) by treatment was: Hot-SD = 11/16; Hot-LD = 11/16; Cold-SD = 11/16; Cold-L
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
