. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 DANIEL S. GROSCH AND HOWARD E. ERDMAN ration was not a problem because the air was kept near the saturation point. Those used for life span records were segregated by sex and maintained 5 per wide mouth jar (50 by 80 mm.). For sterility studies, individual females were placed in stender dishes (60 by 35 mm.) and each provided with an untreated male. Regular mating associated with internal fertilization was observed periodi- cally with all pairs. Feces, debris, and dead animals were removed daily by pipette and an equal a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 278 DANIEL S. GROSCH AND HOWARD E. ERDMAN ration was not a problem because the air was kept near the saturation point. Those used for life span records were segregated by sex and maintained 5 per wide mouth jar (50 by 80 mm.). For sterility studies, individual females were placed in stender dishes (60 by 35 mm.) and each provided with an untreated male. Regular mating associated with internal fertilization was observed periodi- cally with all pairs. Feces, debris, and dead animals were removed daily by pipette and an equal amount of fresh sea water was added. If ova or nauplii had been deposited the pair of parents were transferred by glass tube to another stender dish. All incubator Artemia were fed daily by adding dilute yeast suspension in the amount of one drop per animal to the water of the container. RESULTS AND CONCLUSIONS Figure 1 presents survival of Artemia after exposures to various doses of x-rays. As shown, a sex difference was revealed at higher exposures by the tendency for females to die earlier than males in simultaneous experiments. 20* 15 LJ Ul o:IO = x —. -x. DAYS FIGURE 1. The range in time during which deaths in samples of five Artemia occur sub- sequent to x-ray exposure. Male records are designated by unbroken lines and short vertical marks; female records by broken lines ending in x marks. Control records are indicated by the thickening of the base 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
