Colony size and depth affect wound repair in a branching coral
Colony size and depth affect wound repair in a branching coral
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DOI：
10.1007/s00227-019-3601-6
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发表时间：
2019-11-01
期刊：
影响因子：
2.4
通讯作者：
Sale, Tayler L.
中科院分区：
文献类型：
--
作者：
Counsell, Chelsie W. W.;Johnston, Erika C.;Sale, Tayler L.
珊瑚群落经常受到自然和人为来源的组织损伤。由此产生的伤口会降低菌落适合度，并成为感染或藻类过度生长的来源。通过系统地切断54个poillopora meandrina菌落的分支并进行原位组织再生（2017年4月至8月），研究了夏威夷O’ahu上菌落内、菌落之间和四个地点伤口恢复过程的变化。95%的伤口愈合，平均愈合时间为42天。平均愈合时间在初始和后续伤口之间没有差异。研究了创伤修复过程中内在因素、外在因素和干扰史的相对重要性。先前的群体压力源，即活珊瑚组织百分比和漂白历史，与伤口愈合时间无关。这些结果表明，伤口修复是P. meandrina优先考虑的问题。菌落大小和深度与伤口愈合时间显著相关，较大的菌落比较小的菌落愈合快14 d，较深的菌落比较浅的菌落愈合慢25 d。这些发现支持了一个假设，即更大的菌落有更多的能量用于组织再生。观察到较深菌落较长的愈合时间可能是由随深度变化的外部因素驱动的，包括温度、波浪能量和辐照度。总体而言，我们发现meandrina的伤口愈合对先前的应激源具有生理弹性，但受菌落大小和深度的影响。了解珊瑚再生过程变化的驱动因素对于预测干扰后珊瑚种群的恢复至关重要。
Coral colonies regularly suffer tissue damage from natural and anthropogenic sources. The resultant wounds can decrease colony fitness and act as sources of infection or algal overgrowth. By systematically breaking branches on 54 Pocillopora meandrina colonies and following in situ tissue regeneration (April-August 2017), variation in the wound recovery process was investigated within colonies, among colonies, and across four sites on O'ahu, Hawai'i. Ninety-five percent of all wounds healed, with an average healing time of 42 days. Average healing time was not different between initial and subsequent wounds. The relative importance of intrinsic factors, extrinsic factors, and disturbance history for the wound repair process was examined. Previous colony stressors, i.e., percent live coral tissue and bleaching history, were not correlated with wound healing time. These results indicate that wound repair is a priority for P. meandrina. Colony size and depth were significantly correlated with wound healing time: larger colonies healed 14 days faster than smaller colonies, and deeper colonies healed 25 days slower than shallower colonies. These findings support the hypothesis that larger colonies have more energy available for tissue regeneration. The observation of longer healing times for deeper colonies is likely driven by extrinsic factors that vary with depth, including temperature, wave energy, and irradiance. Overall, we show that wound healing in P. meandrina is physiologically resilient to previous stressors, but is affected by both colony size and depth. Understanding drivers of variation in regenerative processes for corals is critical for predicting coral population recovery after disturbances.