. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 JAMES S. MURPHY AND MARJORIE DAVIDOFF 20 r st ort hoclone. c o CL CD CD Qn 4 th CT *-U D \_ CD > < 20 r 5th 15 16 20 Passage number 24 28 FIGURE 1. The average life span (five animals/datum) of successive passages of the first through fifth orthoclones of Moina inacrocopa. The fourth and fifth orthoclones die out thus demonstrating the Lansing Effect. At passage 15 of the third orthoclone, the experiment was restarted using the progeny of one animal. The animals indicated in the datum marked * were the young of a m
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 304 JAMES S. MURPHY AND MARJORIE DAVIDOFF 20 r st ort hoclone. c o CL CD CD Qn 4 th CT *-U D \_ CD > < 20 r 5th 15 16 20 Passage number 24 28 FIGURE 1. The average life span (five animals/datum) of successive passages of the first through fifth orthoclones of Moina inacrocopa. The fourth and fifth orthoclones die out thus demonstrating the Lansing Effect. At passage 15 of the third orthoclone, the experiment was restarted using the progeny of one animal. The animals indicated in the datum marked * were the young of a mother raised with extra inositol. eventually yield a clone superior to the original but no such effect was found during the limited time span of this study. On the contrary, it is necessary to select the strongest animals to maintain any clone in continuous passage. RESULTS Demonstration of the Lansing effect in Moina macrocopa Figure 1 shows the average life spans in clays of orthoclones from the first through fifth clutches. Six clutches are rare under our conditions. The data are shown as averages of five animals, but it should be noted that nearly every datum contains animals that died after 4 to 5 days or animals that lived 16 to 18 days. In spite of the variation it is clear that the first, second and third. 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
