. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DENSITY EFFECTS ON $ DEVELOPMENT 107 .10- cn Q. O ^ CD ID CD 2 .90- co "6 E .9 -99 i_ o Q. O ol I. •-high ? ratio x - high .05) for 14 out of 16 2-day intervals during which change was occurring. Twenty-seven out of 32 animals survived the 20-day period of observation in the first selected generation. Tests on the proportion of males switching to hermaphrodites over the 2-day intervals through 20 days show that 4 of the 9 intervals tested are significantly different between the selected generation and the pooled par
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DENSITY EFFECTS ON $ DEVELOPMENT 107 .10- cn Q. O ^ CD ID CD 2 .90- co "6 E .9 -99 i_ o Q. O ol I. •-high ? ratio x - high .05) for 14 out of 16 2-day intervals during which change was occurring. Twenty-seven out of 32 animals survived the 20-day period of observation in the first selected generation. Tests on the proportion of males switching to hermaphrodites over the 2-day intervals through 20 days show that 4 of the 9 intervals tested are significantly different between the selected generation and the pooled parent generation. Three of the 4 intervals were during the peak period of change from 7-15 days. Surprisingly, the fast-selected line switched later than the pooled parental lines. It was observed that more food, in the form of the particulate matter (not compacted into fecal pellets) was present at the end of the weekly food replacement cycle in the low density and isolated cultures. DISCUSSION Low density promotes the development of female gonads in male Capitella sp. I resulting in simultaneously hermaphroditic animals. How this aspect of the envi- ronment (low population density) produces such an effect may be explained in two ways. Low density and isolation may be promoting the sex change through increased. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
