. The Biological bulletin. Biology; Zoology; Marine biology. 192 R. G. STROSS AND J. C. HILL The embryos suspended at depths deeper than meters proved to be viable and hatched when incubated in vitro at 17° C. The number hatching in a six-day interval equalled or exceeded the maximum in situ response at the shallow depths (Table V). Embryos exposed to light after having been suspended in opaque cages hatched in consistently larger numbers. Although none of the embryos suspended deeper than 4 meters hatched while suspended in the lake, in subsequent incubation % SATURATION or "»
. The Biological bulletin. Biology; Zoology; Marine biology. 192 R. G. STROSS AND J. C. HILL The embryos suspended at depths deeper than meters proved to be viable and hatched when incubated in vitro at 17° C. The number hatching in a six-day interval equalled or exceeded the maximum in situ response at the shallow depths (Table V). Embryos exposed to light after having been suspended in opaque cages hatched in consistently larger numbers. Although none of the embryos suspended deeper than 4 meters hatched while suspended in the lake, in subsequent incubation % SATURATION or "»C = scale x l/IO or LIGHT % TRANS. I 1 1 1 \ 1 \ 1 1 1 1 1 âH % HATCH â OPAQUE â¡ TRANSPARENT â DISSOLVED O2 â TEMPERATURE -- LIGHT Figure 9. Cumulative hatch of Daphnia embryos in the experiment of the year following (see Fig. 8 for comparison). The containers were suspended near the center of the lake with the exception of the pair represented by the uppermost histogram. Hatching occurred in all containers. (See Methods for modification of the containers in this experiment). the group at 5 meters hatched well in advance of the requisite interval of post- diapause development, indicating that diapause had been terminated prior to removal from the lake. While the embryos removed from the two deepest strata required the full term ( days), the large response suggested that diapause development had proceeded beyond (phase 1) the point where a rise in temperature (see above) could no longer suppress termination. I. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. );
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