MULTIPLE-MODES OF ASEXUAL REPRODUCTION BY TROPICAL AND SUBTROPICAL SEA STAR LARVAE - AN UNUSUAL ADAPTATION FOR GENET DISPERSAL AND SURVIVAL
MULTIPLE-MODES OF ASEXUAL REPRODUCTION BY TROPICAL AND SUBTROPICAL SEA STAR LARVAE - AN UNUSUAL ADAPTATION FOR GENET DISPERSAL AND SURVIVAL
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DOI：
10.2307/1542036
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发表时间：
1994-02-01
影响因子：
1.6
通讯作者：
JAECKLE, WB
中科院分区：
文献类型：
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作者：
JAECKLE, WB
海星星星幼虫（棘皮动物：Asteroidea），收集自亚热带西北大西洋，表现出三种不同的无性繁殖模式。通过后外侧臂的旁裂克隆繁殖了许多不同的双羽藻和腕足藻。这种形态发生与属于Luidia属的幼虫相同。第二种无性繁殖方式涉及口前叶前部的自切。同时收集了具有不同大小的口前叶和不同形态发育阶段的自由游动口前叶的初级幼虫。自由游动的口前叶发育出完整的消化系统，最终形成典型的双羽幼体。幼虫的无性繁殖也可以采取出芽的形式。释放的个体是囊胚期或原肠胚期胚胎。随后的发展，一个bipinnaria阶段的次生幼虫，与体腔形成的可能例外，似乎是通过与正常的幼虫发育相关的事件发生。这些不同的无性繁殖方法提供了一个共同的机制，以增加幼虫寿命的长度和扩大个体的数量。因此，无性繁殖的幼虫应该增加的可能性，在下一代的基因表示。
Sea star larvae (Echinodermata: Asteroidea), collected from the subtropical Northwest Atlantic Ocean, exhibited three distinct modes of asexual reproduction. A number of different bipinnariae and brachiolariae reproduced by paratomous cloning of the posterolateral arms. This morphogenesis was identical to that of larvae assignable to the genus Luidia. A second mode of asexual reproduction involves the autotomization of an anterior portion of the preoral lobe. Primary larvae with preoral lobes of varying sizes and free-swimming preoral lobes of various stages of morphological development were simultaneously collected. The free-swimming preoral lobes developed complete digestive systems and ultimately assumed the form of typical bipinnaria larvae. Asexual reproduction by larvae may also take the form of budding. The released individual is either a blastula- or gastrula-stage embryo. Subsequent development to a bipinnaria-stage secondary larva, with the possible exception of coelom formation, appears to occur through the events associated with normal larval development. These diverse methods of asexual propagation provide a common mechanism to increase the length of larval life and amplify the number of individuals. Thus asexual reproduction by larvae should increase the likelihood of genet representation in the next generation.