Spatial Variability of Size and Sex in the Tropical Corallimorpharian Rhodactis (=Discosoma) indosinensis (Cnidaria: Corallimorpharia) in Taiwan

臺灣產印支圓盤擬珊瑚海葵之個體大小及性別之空間變異

陳昭倫(Chao-Lun A. Cheri) ； 陳章波(Chang-Po Chen) ； 陳一鳴(I-Ming Chen)

《Zoological Studies》 34卷2期 (1995/04) Pp. 82-87

摘要

本研究報導在台灣南部萬里桐淺水海域，印支圓盤擬珊瑚海葵的個體大小及性別的空間變異。印支圓盤擬珊瑚海葵在研究地點形成3個「碗狀」的大群集。位於群集中央的個體顯著的大於群集邊緣的個體。雌性個體位於群集的中央，而雄性個體則散布在群集的邊緣。個體遷移實驗顯示，位於群集中央的雌性個體在搬遷到群集邊緣8個月後，個體顯著變小，且發育成雄性。而位於群集邊緣性別不可辨的個體，在搬遷到群集中央8個月後，個體顯著變大，發育為雄性。我們推測印支圓盤擬珊瑚海葵在其空間分布中之某些環境因素，為其個體大小及性別表現的決定因子。

關鍵字

性轉換 ； 大小變異

並列摘要

Spatial variability in size and sex and sexual expression in the tropical corallimorpharian Rhodactis (= Discosoma) indosinensis Carlgren, 1943, were studied at Wanlitung in southern Taiwan (120°41'E; 22°01'N). Rhodactis indosinensis formed three bowl-like aggregations in the study site. The mean body sizes of R. indosinensis individuals were significantly larger in the middle of an aggregation than at the margin. Females were located in the middle of each aggregation, and males were scattered around the margins. When mature females were transplanted from the middle of the aggregation to the margin, they had significantly decreased in size and changed into males by eight months later. When reproductively inactive polyps were transplanted from the margin of the aggregation to the middle, they had increased in size and developed into males by eight months later. This positional separation of the sexes may result from different environmental factors which exist between the middle and the margin of an aggregation.

並列關鍵字

Sex change ； Size variability