. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 336 M. YAMASHITA AND F. IWATA DAYS 30- co CO LU 1 20- o CE 111 0. CO U- 10- DC 13 Q spermatocyte — spermatozoon spermatocyte — spermatid —B-— spermatid — spermatozoon. D DD 35 10 SEA WATER TEMPERATURE i 15 20 °C FIGURE 5. Correlation between the duration of spermatogenesis of Amphipholis kochii and the sea water temperature. The animals were reared at various experimental temperatures and the duration of spermatogenesis in each experiment was then measured. Seasonal changes in the spermatocyte production rate (SPR) To estima
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 336 M. YAMASHITA AND F. IWATA DAYS 30- co CO LU 1 20- o CE 111 0. CO U- 10- DC 13 Q spermatocyte — spermatozoon spermatocyte — spermatid —B-— spermatid — spermatozoon. D DD 35 10 SEA WATER TEMPERATURE i 15 20 °C FIGURE 5. Correlation between the duration of spermatogenesis of Amphipholis kochii and the sea water temperature. The animals were reared at various experimental temperatures and the duration of spermatogenesis in each experiment was then measured. Seasonal changes in the spermatocyte production rate (SPR) To estimate the SPR per day throughout each month, the number of the sper- matocytes (Fig. 2) was divided by the duration of the spermatocytic stage (the du- ration from spermatocyte to spermatid. Table II). Table III shows the seasonal changes in the SPR. It was apparent that the seasonal changes in the SPR had two distinct periods, one from November to February (phase 2) and the other from March to June (phases 3 and 4). The SPR in phases 3 and 4 was about six times higher than that in phase 2. The SPR was high in phase 3 though the sea water temperature was noticeably low at this season (Fig. 2). In phase 2, however, the SPR TABLE III The spermatocyte production rate in Amphipholis kochii during the season from November to June Phase 2 Phase 3 Phase 4 Nov Dec Jan Feb Mar Apr May Jun No. of spermatocytes (X104) (N) Duration of spermatocytic stage (days) (D) 7 10 18 22 14 14 7 5 N/D Spermatocyte production rate (per day) The rate in each month is represented as a ratio to the rate obtained in 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. ); Mari
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
