Regeneration and Potential Functional Differentiation of Arms in the Brittlestar, Ophiocoma Scolopendrina (Lamarck) (Echinodermata: Ophiuroidea)

蜈蚣櫛蛇尾陽燧足之腕再生及功能分化

宋克義(Ker-Yea Soong) ； 沈驗(Yen Shen) ； 曾淑賢(Shu-Hsien Tseng) ； 陳章波(Chang-Po Chen)

《Zoological Studies》 36卷2期 (1997/04) Pp. 90-97

摘要

民國八十年七月至八十一年四月間在南臺灣研究了蜈蚣櫛蛇尾陽燧足（Ophiocoma scolopendrina）之腕的斷落及再生，在618隻樣品中56%的個體有斷落而再生的腕（佔全部腕數19%），斷腕多發生在靠近尖端處。斷三腕以上之隻數超過逢機之預期，斷腕之間可能互相並不是獨立的。每隻腕可依對水孔（madreporite）之相對位置定出腕號，五隻不同腕號發生再生之機率顯著不同，在野外觀察中，其伸出岩隙的機率也顯著不同。較少伸出之腕有較少受傷而再生之現象，此點顯示輻射對稱的陽燧足五隻腕外形上雖然沒有差別，但功能上可能已有分化。腕再生速率為1.2公分／月，與斷腕隻數無關。不同腕再生速率未發現不同。但再生速率可能受到鄰腕狀況之影響，當三隻相鄰腕均切斷時，中間斷腕再生較快；但若三隻斷腕不全相鄰，則並無此現象。

關鍵字

陽燧足 ； 再生

並列摘要

Arm breakage and regeneration in the brittlestar, Ophiocoma scolopendrina (Lamarck), were surveyed in southern Taiwan from July 1991 to April 1992. A total of 618 individuals were examined, revealing that in 56% of individuals, or 19% of arms, were undergoing the process of regeneration. Breakage occurred mainly at the distal 1/3 of the arm. The number of individuals with 3 or more regenerating arms exceeded that of expectation from a binomial distribution, suggesting that individual arm breakage might be dependent on the status of the other arms. The arms, according to their position relative to the madreporite, have different probabilities of being protruded, and they also have different probabilities of breakage in the field. The arms most frequently protruded tend to be the most frequently injured. This phenomenon suggests that functions of arms may have differentiated despite the similar morphology of the various arms in the brittlestar. Laboratory experimental results indicate that the rate of regeneration per broken arm averages 0.4 mm/day, whether 1 or 3 arms were injured. Arm position, relative to the madreporite, however, made no difference in regeneration rates when all 5 arms were cut. Nevertheless, when 3 adjacent arms were severed, the center arm regenerated faster than the 2 side arms; this did not happen when the 3 injured arms were not all adjacent. The faster regeneration of the center arm may provide the advantage of restoring arm functions sooner.

並列關鍵字

Brittlestar ； Regeneration