Sexual and asexual reproduction of Anthopleura dixoniana (Anthozoa: Actiniaria): periodicity and regulation |
| |
Authors: | J Lin C -P Chen I -M Chen |
| |
Institution: | (1) Institute of Marine Biology, National Sun Yat-sen University, 800 Kaohsiung, Taiwan, Republic of China;(2) Present address: Institute of Zoology, Academia Sinica, Nankang, 11529 Taipei, Taiwan, Republic of China;(3) Department of Marine Resource, National Sun Yat-sen University, 800 Kaohsiung, Taiwan, Republic of China |
| |
Abstract: | Reproduction of the sea anemone Anthopleura dixoniana (Haddon and Shackleton) from the high intertidal zone of southern Taiwan (120°41 E; 22°01N) was studied from April 1987 through March 1989. A. dixoniana spawns once a year, in July, and divides asexually by longitudinal fission throughout the year, with a peak in July. During the spawning season, sea anemones>3 mm pedal dise diameter can be sexed, and display a 1:1 sex ratio. Dividing sea anemones are significantly larger than non-dividing individuals, and increase in body size before fission. Under laboratory conditions, individuals kept at 28 C and fed had larger oocytes and a higher division rate than those kept at 18, 22, 25 or 32°C or starved. The division rate significantly influenced the oocyte diameter. The present study revealed for the first time, that a long photoperiod (14 h hight:10 h dark) significantly enhances the growth of oocytes in A. dixoniana under laboratory conditions. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|