. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GONADAL DEVELOPMENT OF XENIA 35. FIGURE 2. Gonads ofXenia macrospiculata. a: Longitudinal section through a colony showing oocytes in the syndetial part of the polyp cavities (xl). b: Oocytes arranged along a mesentery, arrow indicates the sclerites (X40). c: Oocytes in the polyp cavities of a sectioned colony (X7). d: Testes in the polyp cavities of a sectioned colony (X3). e: Mature spermatozoa burst a sperm sac. Abbreviations: MS—mesentery, O— oocyte, SP—spermatozoa, T—testes. in all polyps of a colony. Further appearance
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GONADAL DEVELOPMENT OF XENIA 35. FIGURE 2. Gonads ofXenia macrospiculata. a: Longitudinal section through a colony showing oocytes in the syndetial part of the polyp cavities (xl). b: Oocytes arranged along a mesentery, arrow indicates the sclerites (X40). c: Oocytes in the polyp cavities of a sectioned colony (X7). d: Testes in the polyp cavities of a sectioned colony (X3). e: Mature spermatozoa burst a sperm sac. Abbreviations: MS—mesentery, O— oocyte, SP—spermatozoa, T—testes. in all polyps of a colony. Further appearance and growth of the oocytes or the sperm sacs is completely synchronized within an individual coral. When the diameter of the oocytes or testes is less than 30-40 ^um, they can be distinguished only by histological sections. After they attain this size, sex determination is easily done by observing their color. The oocytes are spherical, opaque, and cream- white. The sperm sacs are rounded, transparent, and cream-colored. After preservation in alcohol or formalin they become yellow. Microscopic examination of the gonadal smears indicates that each oocyte contains a nucleus and a nucleolus. The sperm sacs are granulated and mature spermatozoa tend to rupture their wall (Fig. 2e). The gonads are attached to the mesenteries by short pedicels and they are surrounded by an endodermal layer rich with zooxanthellae. Figure 3 presents the monthly reproductive state of the population during the study period in both shallow (Fig. 3a) and deep reefs (Fig. 3b). Throughout the year the majority of the colonies in each monthly sample of 20 colonies contain male or female gonads and a certain proportion of the population harbors IGP. The first IGP in the population usually start to appear in September or October and their initiation lasts a few Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloratio
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
