1986 Fiscal Year Final Research Report Summary
Basic studies on the processes of reproduction and colony formation in corals.
| Project/Area Number |
59440005
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
動物形態・分類学
|
|---|
| Research Institution | University of the Ryukyus |
|---|
Principal Investigator |
YAMAZATO Kiyoshi University of the Ryukyus, College of Science, Professor, 理学部, 教授 (80044973)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
ISA Yeishin University of the Ryukyus, College of Science, Instructor, 理学部, 助手 (20045040)
MOTOKAWA Tatsuo University of the Ryukyus, College of Science, Associate Professor, 理学部, 助教授 (80092352)
UEHARA Tsuyoshi University of the Ryukyus, College of Science, Associate Professor, 理学部, 助教授 (20045016)
NISHIHIRA Moritaka University of the Ryukyus, College of Science, Professor, 理学部, 教授 (80004357)
YAMASU Terufumi University of the Ryukyus, Division of General Education, Professor, 教養部, 教授 (80032811)
|
|---|
| Project Period (FY) |
1984 – 1986
|
| Keywords | Sexual reproduction in corals / Asexual reproduction in corals / Ultrastructure of coral skeleton / Skeletogenesis in corals / Mechanism of disc detachment in Fungia / Fertilization in Lobophytum / Embryogenesis in Lobophytum / フトウネタケの初期発生 |
|---|
| Research Abstract |
1. Growth rates and other aspects of polypal growth in the colonies of Galaxea fascicularis were studied. In addition, reproductive processes of this species, Porites (Synaraea) rus and Pocillopora damicornis were elucidated.
2. Newly settled polyps of Pocillopora damicornis were studied by transmittance and scanning electron microscope and the microstructure of both soft tissues and skeleton were analyzed with special reference to the initial stages of calcium carbonate crystallization.
3. Calcium carbonate crystallization processes of the regenerating skeletons of Acropora hebes were examined and elucidated to parallel the normal skeleton formation processes. In addition, calcium binding capacity of calcium binding substance obtained from alcyonacean and scleractinian corals was studied and positive results were obtained.
4. Processes of detachment of discs from stalks of Fungia fungites was studied with scanning electron microscope and found that crystal to powder transformation at the detaching site was found reponsible for detachment, which in turn was probably induced by acid production of calicoblastic epithelial tissues. Changes in mechanical strength in the course of detachment was studied also.
5. Fertilization, embryogenesis and metamorphosis of the larvae of Lobophytum crassum and Galaxea fascicularis were studied.
6. Transformation of nematocysts in the tentacles of Galaxea fascicularis during the course of changes from the normal to sweeper were studied. Nematocysts with slender capsules and long shafts of threads transformed into those with fat capsule and short and obsure shaft, which were proposed to be included in b-rhabdoid group.
|
