. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GONADAL DEVELOPMENT OF XENIA 37 6O _ra 3 Q. O 40 c 0) o i. 0) Q- 2O No gonads Males Females 25 71 57. 30 15 [71 14 29 X 11-15 16-20 21-25 >26 16-20 26-30 >31 Group size (cm3) FIGURE 4. Size frequency distribution and sexual state of Xenia macrospiculata in 3-5 m (a) and in 27-30 m (b). Sample size of each group size is indicated above the bars. similar annual pattern for both populations. The results indicate that rarely in Sep- tember, but usually in October, colonies of X. macrospiculata bear IGP, which
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GONADAL DEVELOPMENT OF XENIA 37 6O _ra 3 Q. O 40 c 0) o i. 0) Q- 2O No gonads Males Females 25 71 57. 30 15 [71 14 29 X 11-15 16-20 21-25 >26 16-20 26-30 >31 Group size (cm3) FIGURE 4. Size frequency distribution and sexual state of Xenia macrospiculata in 3-5 m (a) and in 27-30 m (b). Sample size of each group size is indicated above the bars. similar annual pattern for both populations. The results indicate that rarely in Sep- tember, but usually in October, colonies of X. macrospiculata bear IGP, which measure approximately 40 ^m. The same narrow and low size range of oocytes is also recorded during the following months. By February, the oocytes reach a size of about 100 nm and IGP continue to develop until April-May (Fig. 5). In addition to the IGP more oocytes appear along the mesenteries for a period of 7-8 months (October-May). The prolonged oogenesis generates a wide range of oocyte sizes for several months y VJ -1 D -1 .__ r-| , - 400- 1 — - - -" r -i ?200- r ~" sJ H 0) _ ,_£ -Lu e IE J L-. L_J r~r- JJ J , R , z o •-— 1C •o 01 ^400- C! i) i r 1 -^ rP o a . — , 200 - r 1- i— rr = 1 _ru — ' i — T~r— r- X -^ . 0 I— i— i M M J S N J M M J S N J M M J s N J M M J S N J M M J 1977 1978 1979 1980 1981 FIGURE 5. Monthly changes in the size-range of oocytes of Xenia macrospiculata in 3-5 m (a) and in 27-30 m (b).. 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
