Evidence of matrotrophy in the viviparous holothuroid echinoderm Synaptula hydriformis
Evidence of matrotrophy in the viviparous holothuroid echinoderm Synaptula hydriformis
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DOI：
10.2307/3226968
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发表时间：
1998-01-01
影响因子：
1.2
通讯作者：
Frick, JE
中科院分区：
文献类型：
--
作者：
Frick, JE
Synaptula diformis是一种海参棘皮动物，在成年的内脏周围体腔中保留其幼仔。它也是一个同时雌雄同体，可能是自我繁殖。卵子从生殖上皮释放到卵睾小管的内腔，然后从那里进入内脏周围体腔。S.卵是胎生的：卵从不被释放到成年生物体的外部，而是在内部发育，直到幼鱼被释放。它也是母养型的：幼仔依靠父母提供的营养超过了蛋黄提供的营养。从卵到8-mm幼鱼的干重和有机重的增加超过100倍。额外的营养是作为体腔细胞和存在于成体体腔液中的分子提供的。育雏青少年消费自然发生的颗粒和实验引入50纳米和1 μ m的微球从成人围内脏体腔。C-14-棕榈酸也被育雏少年摄入，并被纳入少年组织，表明消耗的营养物质被代谢。
Synaptula hydriformis is a holothuroid echinoderm that retains its young in the adult perivisceral coelom. It is also a simultaneous hermaphrodite and is probably self-fertilizing. Eggs are released from the germinal epithelium into the lumen of the ovotestis tubule, and from there into the perivisceral coelom. S. hydriformis is viviparous: eggs are never released to the outside of the adult organism, but develop internally until juveniles are released. It is also matrotrophic: the young rely on the parent to supply nutrition in excess of that supplied by yolk in the egg. The increase in both dry and organic weight from egg to 8-mm juvenile is in excess of 100X. The additional nutrition is supplied as coelomocytes and molecules present in adult coelomic fluid. Brooded juveniles consume naturally occurring particulates and experimentally introduced 50-nm and 1-mu m microspheres from the adult perivisceral coelom. C-14-palmitic acid was also ingested by brooded juveniles and was incorporated into juvenile tissue, indicating that consumed nutrients are metabolized.