. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 D. J. LONSDALE AND J. S. LEVINTON TABLE II Mean egg development times (fi) oj Scottolana canadensis collected from five locales and reared at four temperatures (°C) Temperature (°C) Locale 15 20 25 28 ME 67. 7a _ MA 52. 7h — MD ; SC FL 'c 44. la Means with identical superscripts (a, b, or c) are not significantly different (.05 level) at a given temperature. well as among females within a locale (P < ; Nested ANOVA). Eggs of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 424 D. J. LONSDALE AND J. S. LEVINTON TABLE II Mean egg development times (fi) oj Scottolana canadensis collected from five locales and reared at four temperatures (°C) Temperature (°C) Locale 15 20 25 28 ME 67. 7a _ MA 52. 7h — MD ; SC FL 'c 44. la Means with identical superscripts (a, b, or c) are not significantly different (.05 level) at a given temperature. well as among females within a locale (P < ; Nested ANOVA). Eggs of ME females were the largest, averaging ± .12 X 105 /urn3 (±95% confidence), MD were intermediate, ± .04 X 105 /um3, and FL were the smallest, ± .07 X 105 ^m3. In 1983, both the latitude from which the copepod originated and the rearing temperature were significant variables affecting the mean egg volume of a female Scottolana (P < and P < , respectively; multiple regression). As in the previous year, egg volumes of ME females were the largest, whereas there was no difference between MD and FL eggs (Fig. 2). The influence of temperature is only apparent between 15 and 20°C; egg volumes are substantially reduced at 20°C in all populations. There is no further reduction in volume between 20 and 28°C. Newborn survivorship Newborn survivorship curves constructed from the copepod growth rate exper- iment conducted at 25°C and X 104 cells/ml are shown in Figure 3. At this ration, survivorship was poor for all five populations. At the termination of the CO 2 o X *_* w 3 O O O UJ 27 38 LATITUDE CM) 43 FIGURE 2. Mean egg volumes (X105 ^m3; ±95% confidence) of Scottolana canadensis collected from three locales (ME, MD, FL) and tested at four temperatures (15, 20, 25, 28°C).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
