. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN DEVELOPMENT 137 Asterias forbesi) show no such sensitivity when grown in untreated sea water. Examination of embryo cultures after disintegration reveals a large population of Pseudomonas sp. and other unidentified bacteria. Apparently ^. droebachiensis is particularly susceptible to bacterial action. DISCUSSION Conditions influencing breeding Harvey (1956) reports that .S. droebachiensis from Salisbury Cove, Maine, had unripe eggs in January and February, showed maximum ripeness in March 20 15 10 9 8 2 5. o x) A
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SEA URCHIN DEVELOPMENT 137 Asterias forbesi) show no such sensitivity when grown in untreated sea water. Examination of embryo cultures after disintegration reveals a large population of Pseudomonas sp. and other unidentified bacteria. Apparently ^. droebachiensis is particularly susceptible to bacterial action. DISCUSSION Conditions influencing breeding Harvey (1956) reports that .S. droebachiensis from Salisbury Cove, Maine, had unripe eggs in January and February, showed maximum ripeness in March 20 15 10 9 8 2 5. o x) A 0 Cytokinesis Metaphase -1 10 FIGURE 2. Semi-logarithmic plot of the mean time for metaphase and cytokinesis temperature for the first and second divisions. and April, and was fully spent by mid-May. Boolootian (1966), on the other hand, cites February and March as the peak season, with some ripe gametes obtain- able in January but spawn-out in March for animals collected from Lamoine, Maine. The animals employed in this report, obtained from Boothbay Harbor, Maine, correspond most closely with Harvey's data, while the Cape Cod Bay population appears to ripen coincidentally with the population cited by Boolootian but remains ripe much longer. Sverdrup, Johnson, and Flemming (1942) report that 5". droebachiensis in Norway has a breeding season from December through April, but gives no location, quantitative fertility data, nor seasonal temperature 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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