. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION DYNAMICS OF CREPIDULA 521 Annual population cycle Oviposition probably begins in late April or early May coincident with the seasonal increase in water temperature. Eggs were first observed in the field on 12 May, when water temperature had risen to about ° C. At this time, females dominate the population (Fig. 5) and the percentage of brooding females approaches 100 per cent. This percentage declines to about 50 per cent in July, and to 25-30 per cent in August. 'Factors mediating this decline may be depletio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION DYNAMICS OF CREPIDULA 521 Annual population cycle Oviposition probably begins in late April or early May coincident with the seasonal increase in water temperature. Eggs were first observed in the field on 12 May, when water temperature had risen to about ° C. At this time, females dominate the population (Fig. 5) and the percentage of brooding females approaches 100 per cent. This percentage declines to about 50 per cent in July, and to 25-30 per cent in August. 'Factors mediating this decline may be depletion of sperm in the seminal receptables, exhaustion of energy reserves, and an increasing percentage and number of newly transformed females which have not yet been inseminated. Brooding of the new year class in June results in a large number of immature and phallus-bud individuals in July. These, plus older males, comprise the pop- 40 30 JUNE 1968 12 13 14 15 16 17 18 19 20 34567. 10 - FIGURE 6. Size-frequency histograms for the Pagums subpopulation; June-August, 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 not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
Size: 1414px × 1766px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
