Scholarlink

<p>Polyp bail-out in scleractinian corals is an intriguing phenomenon that consists in the detachment of single skeletonless polyps from the parent coral colony. In this study, the cellular and molecular characteristics of bailed-out polyps and their parent corals under heat stress were explored for coral <i>Pocillopora damicornis</i>. Both tissue loss (in six of 21 parent corals) and polyp bail-out phenomena (in 15 of 21 parent corals) were observed upon heat stress, and various physiological features of bailed-out polyps were observed in <i>P. damicornis</i>. Ten of the 15 coral colonies showed obvious bleaching before polyp bail-out (designated as “bleaching group”), while five of 15 coral colonies exhibited no obvious bleaching during bail-out process (designated as “unbleaching group”). The bailed-out polyps were circular or oval in shape, and the polyps in the unbleaching group had a higher symbiont density, higher total antioxidant capability, higher energy availability (<i>E</i><sub>a</sub>) values, lower chlorophyll-<i>a+c</i><sub>2</sub> content, and lower caspase-3 activation levels than those of the bleaching group. Moreover, parent corals with higher <i>E</i><sub>a</sub> values, higher antioxidant capacity, and lower apoptotic activity were more likely to remain unbleached during polyp bail-out. These results indicate that coral bleaching and polyp bail-out occurred simultaneously under heat stress in <i>P. damicornis</i>. Some coral colonies underwent polyp bail-out before bleaching, whereas others released polyps after bleaching. These differences were resulted from the initial health status of parent corals before heat stress.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The scleractinian coral Pocillopora damicornis Linnaeus, 1758 released polyps with different physiological characteristics under heat stress

  • 期刊论文

  • 发表日期：

    2026年1月6日

查看全文
  • Kai Tang,
  • Zhaoqun Liu,
  • Zhicong Yan,
  • Mingxun An,
  • Jia Tang,
  • Jiamin Lin,
  • Chuanliang Wu,
  • Zhi Zhou

摘要

Polyp bail-out in scleractinian corals is an intriguing phenomenon that consists in the detachment of single skeletonless polyps from the parent coral colony. In this study, the cellular and molecular characteristics of bailed-out polyps and their parent corals under heat stress were explored for coral Pocillopora damicornis. Both tissue loss (in six of 21 parent corals) and polyp bail-out phenomena (in 15 of 21 parent corals) were observed upon heat stress, and various physiological features of bailed-out polyps were observed in P. damicornis. Ten of the 15 coral colonies showed obvious bleaching before polyp bail-out (designated as “bleaching group”), while five of 15 coral colonies exhibited no obvious bleaching during bail-out process (designated as “unbleaching group”). The bailed-out polyps were circular or oval in shape, and the polyps in the unbleaching group had a higher symbiont density, higher total antioxidant capability, higher energy availability (Ea) values, lower chlorophyll-a+c2 content, and lower caspase-3 activation levels than those of the bleaching group. Moreover, parent corals with higher Ea values, higher antioxidant capacity, and lower apoptotic activity were more likely to remain unbleached during polyp bail-out. These results indicate that coral bleaching and polyp bail-out occurred simultaneously under heat stress in P. damicornis. Some coral colonies underwent polyp bail-out before bleaching, whereas others released polyps after bleaching. These differences were resulted from the initial health status of parent corals before heat stress.