. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. J J A 1989-90. o 50- D. CW > 1989-90 Figure 2. Reproductive and molting cohorts for female Sesarma sp. (nr. reticulatum) taken in field samples during 1989 and 1990. A. Ovigerous crabs mm carapace width. C. Molting crabs mm carapace width. that seen in the laboratory. Instead, peaks in egg laying and larval release occurred near dates of new and full moons throughout the reproductive season (Fig. 5). Ovarian growth Ovarian wet weights, expressed as an index of grams wet weight ovary per millimeter carapac
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. J J A 1989-90. o 50- D. CW > 1989-90 Figure 2. Reproductive and molting cohorts for female Sesarma sp. (nr. reticulatum) taken in field samples during 1989 and 1990. A. Ovigerous crabs mm carapace width. C. Molting crabs mm carapace width. that seen in the laboratory. Instead, peaks in egg laying and larval release occurred near dates of new and full moons throughout the reproductive season (Fig. 5). Ovarian growth Ovarian wet weights, expressed as an index of grams wet weight ovary per millimeter carapace width, were compared to ovary color; yellow ovaries were the lightest, which suggested inactivity, orange ovaries were slightly heavier, which suggested rebuilding or oogenesis, and red- black ovaries were the most massive because of vitello- genesis (Table I). Vitellogenic ovaries were seen in of the sample as early as mid-January, and the numbers of crabs possessing vitellogenic ovaries increased through the reproductive season until August when nearly all fe- male crabs of mature size had reproductively active ova- ries. This percentage dropped to near zero in September, after which a slight increase occurred in October before vitellogenesis ended for the season (Fig. 6). Inversely, the percentage of inactive yellow ovaries increased markedly in samples after the cessation of vitellogenesis in Septem- ber and October. Ovarian rebuilding for the population quickly followed inactivity so that by 22 November of the sample possessed orange ovaries. When only vitellogenic ovaries were considered, inten- sity of yolk deposition began to increase in late March and April, and to peak in late April. Intensity of yolk deposition declined during the May-early June molting period, and increased to a high level throughout the sum- mer reproductive peak. High values near g/mm, which would indicate eggs are ready to be extruded, are absent during the two sampling dates (
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
