. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH OF HOST AND ZOOXANTHELLAE 115 J3 - | % ol hypostome cells ^^ D % ol tentacle cells jfl 30 - ~Q> O •~ 25 - </) O .c »- 20 - O 5? "- 15 - 0 c 0) 10 - 0) nflr £ 5 - n n n n n n - hji-jn nn nnnn nnn jn nnn n 1 2 3 4 5 6 7 8 9 10 12 16 20 24 28 32 36 40 44 48 Number of zooxanthellae per host cell 52 56 60 64 Figure 3. Frequency distribution of host gastrodermal cells of the hydroid Myriimemu ambionense in relation to density of symbiotic dinoflagellates residing within. Solid bars indicate percent of columnar hy
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. GROWTH OF HOST AND ZOOXANTHELLAE 115 J3 - | % ol hypostome cells ^^ D % ol tentacle cells jfl 30 - ~Q> O •~ 25 - </) O .c »- 20 - O 5? "- 15 - 0 c 0) 10 - 0) nflr £ 5 - n n n n n n - hji-jn nn nnnn nnn jn nnn n 1 2 3 4 5 6 7 8 9 10 12 16 20 24 28 32 36 40 44 48 Number of zooxanthellae per host cell 52 56 60 64 Figure 3. Frequency distribution of host gastrodermal cells of the hydroid Myriimemu ambionense in relation to density of symbiotic dinoflagellates residing within. Solid bars indicate percent of columnar hypostome cells; clear bars show percent of circular tentacle cells. such as arthropod exoskeletons, setae, and unidentified de- bris, that were not present in hydroids collected during the day. In addition, the presence of vacuoles within digestive cells showed a prominent diel cycle, with a rapid rise immediately after dusk in the percentage of digestive cells containing vacuoles and the number of vacuoles per diges- tive cell (Fig. 6A). Maximum values for these parameters extended from the middle of the night to the morning, then slowly decreased during the morning hours to afternoon lows. This pattern suggested that the vacuoles are actually food vacuoles associated with nighttime feeding by the hydroids. To test this hypothesis, starved animals (3-7 days) were fed brine shrimp nauplii for 1 h in the laboratory, then examined for vacuole formation hourly for the next 13 h. Within 2 h of feeding the percentage of host cells with vacuoles, the number of vacuoles per host cell, and the relative volume of the host cell filled with vacuoles in-. 5000 10000 Volume of host cell Figure 4. Relationship between number of symbiotic dinoflagellates and the volumn of the host (M\rionema ambionense) gastrodermal cells they live in. 25 - 20 - 15 - 10 - s - 0 • Laboratory O Field. Please note that these images are extracted from scanned page images that may have been digitally enhanced
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
