. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 Eggs I 2 Eggs Follicle Diameter {mm) Figure 2. Subtle variations in the ovarian profiles (follicle size/fre- quency distributions) of Fundulus Iwtcroclini'i females collected during full moon spring tides in successive months of a breeding season. Each profile provides the mean number of various size follicles (filled bars) and ovulated eggs (unfilled bars) found for five fish on each sample date. In each histogram, the left dashed vertical line marks the transition from the cortical alveoli stage of d
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 12 Eggs I 2 Eggs Follicle Diameter {mm) Figure 2. Subtle variations in the ovarian profiles (follicle size/fre- quency distributions) of Fundulus Iwtcroclini'i females collected during full moon spring tides in successive months of a breeding season. Each profile provides the mean number of various size follicles (filled bars) and ovulated eggs (unfilled bars) found for five fish on each sample date. In each histogram, the left dashed vertical line marks the transition from the cortical alveoli stage of development into vitellogenesis, and the right dashed vertical line marks the transition from vitellogenesis into mat- uration, as defined by Selman and Wallace (1986). Note the increased formation of distinct follicle clutches as the months progressed. (Fig. 1). Any failures in this process would result in atretic follicles, hut these did not occur regularly during our ob- servations (Fig. 1). Details of the vitellogenesis-matura- tion-ovulation transition during a lunar cycle were re- vealed by the ovarian profiles collected at 2-day intervals over a 23-day period (Fig. 3). After a minor new-moon spawn (29 April), the ovaries examined had few early vi- tellogenic follicles, no maturing follicles, and only a few ovulated eggs. During the next several days, however, mid- to late-vitellogenic follicles appeared and then accumu- lated in the ovary, and after the quarter moon on 7 May, a distinct clutch of maturing follicles also appeared. Af- terward, vitellogenic follicles entered maturation, resulting in maturing follicles and ovulated eggs during days of spring tides ( 11. 13, 15 and 17 May) that occurred on and immediately preceded and followed the full moon (15 May). In these spawning days, follicles appeared to mature and ovulate in waves, one clutch after the other. At times ( 13 May), as one clutch began to mature, another was in late maturation, and the leading
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
