ASEXUAL REPRODUCTION BY TRANSVERSE FISSION AND SOME ANOMALIES IN THE SEA-ANEMONE NEMATOSTELLA-VECTENSIS
ASEXUAL REPRODUCTION BY TRANSVERSE FISSION AND SOME ANOMALIES IN THE SEA-ANEMONE NEMATOSTELLA-VECTENSIS
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DOI：
10.2307/3226948
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发表时间：
1995-01-01
影响因子：
1.2
通讯作者：
UHLINGER, KR
中科院分区：
文献类型：
--
作者：
HAND, C;UHLINGER, KR
线虫是仅有的5种通过横向裂变进行无性繁殖的海葵之一。本物种的兄弟姐妹个体以高度可变的速率分裂，有些个体很少分裂或根本不分裂，而另一些个体可能一年分裂多次。野外种群通常是单性的，这样的种群可能是由单一的创始者克隆而来的。随着单个海葵的生长，产生的无性碎片不一定变大，在碎片上再生功能口冠所需的时间也与碎片的大小有关。与不含丸剂的碎片相比，在流产碎片中包含一丸未消化的食物可能会延迟再生的完成。增加的食物摄入增加了裂变的频率，导致更小的碎片，但对碎片再生所需的时间没有显著影响。饥饿抑制个体的裂变，但不能完全消除它。多冠异常在自然种群和实验室种群中都很常见。随后的多冠个体裂变产生正常的单冠海葵，并符合出芽的定义，这是海葵中真正罕见的现象。
Nematostella vectensis is one of only 5 sea anemones known to reproduce asexually by transverse fission. Sibling individuals of this species divide at highly variable rates with some individuals dividing rarely or not at all, while others may divide many times a year. Field populations are frequently unisexual, and such populations may be clones derived from a single founder, As individual anemones grow, the asexual fragments produced do not necessarily become larger, nor is the time taken to regenerate a functional oral crown on a fragment related to the size of the fragment. The inclusion of a bolus of undigested food in an aboral fragment may delay completion of regeneration as compared to fragments without a bolus. Increased food intake increases the frequency of fission and results in smaller fragments but does not significantly influence the time fragments take to regenerate. Starvation suppresses fission in individuals but does not totally eliminate it. Multi-crowned anomalies are common in natural and in laboratory populations. Subsequent fission of multi-crowned individuals produces normal, single-crowned anemones and meets the definition of budding, a truly rare phenomenon in sea anemones.