Abstract
The distribution and reproductive cycle of the sponge Halichondria okadai were investigated at Peng-Hu from June, 2000 to February, 2002. The sponge population was mostly distributed in the midlittoral zone. The size of sponges increased or decreased in the range of 33.3% ~ -16.7%. The substrata were mainly composed by grains with sizes of 0.12~0.84 mm. The sponge is gonochorism. Early stage oocytes were found in March. Mature eggs and embryos were observed from April to September, with a peak period from June to August. The reproductive season extends from March through September which is correlated to annual changes of water temperature. The size of embryos ranged from 260 to 450£gm and the density was up to 1331 per (0.5 cm)3 in May. To our knowledge, the embryo density is the highest one in the sponge group. Juveniles settled in the back side of rocks. When the juveniles moved to the rock surface, the color changed from white to black.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0226102-141252 |
| Date | 26 February 2002 |
| Creators | Chung, I-Fu |
| Contributors | Li-Lian Liu, Keryea Soong, Tsung-Han Lee, I-Ming Chen |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0226102-141252 |
| Rights | unrestricted, Copyright information available at source archive |
Page generated in 0.0016 seconds