Qin Binni, Yu Kefu, Zuo Xiuling
School of Marine Sciences, Guangxi University, Nanning, 530004, China; Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, 530004, China.
School of Marine Sciences, Guangxi University, Nanning, 530004, China; Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, 530004, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519080, China.
Mar Environ Res. 2023 Apr;186:105939. doi: 10.1016/j.marenvres.2023.105939. Epub 2023 Mar 10.
Coral bleaching heat stress products provide real-time and rapid coral bleaching alerts for coral reefs globally. However, geographical variations in the alert accuracy of multi-source coral bleaching heat stress products exist. Taking the coral reefs in the South China Sea (SCS) as the study area, we evaluated and improved the coral bleaching alert capabilities of two coral bleaching heat stress products: Coral Reef Watch (CRW) and Coral Reef Temperature Anomaly Database (CoRTAD). Using in situ coral bleaching survey data and evaluation indicators, the optimized thresholds of degree heating weeks (DHWs) for coral bleaching alerts were determined. The results in the SCS indicated that, first, CRW was better than CoRTAD for coral bleaching event alerts. However, both products underestimated coral bleaching events using the common DHW thresholds of 4°C-weeks and 8°C-weeks. Second, the DHW optimized threshold for CRW was 3.32°C-weeks for coral bleaching event alerts and 4.52°C-weeks for severe coral bleaching event alerts. For CoRTAD products, the DHW optimized threshold was 2.36°C-weeks for coral bleaching event alerts and 4.14°C-weeks for severe coral bleaching event alerts. This study proposed a method to evaluate and optimize the alert capability of multi-source coral bleaching heat stress products, which can provide more accurate basic data for coral reef ecosystem health assessment and contribute to global coral reef ecosystem protection and restoration.
珊瑚白化热应激产品可为全球珊瑚礁提供实时、快速的珊瑚白化警报。然而，多源珊瑚白化热应激产品的警报准确性存在地理差异。以南海珊瑚礁为研究区域，我们评估并改进了两种珊瑚白化热应激产品的珊瑚白化警报能力：珊瑚礁观察（CRW）和珊瑚礁温度异常数据库（CoRTAD）。利用现场珊瑚白化调查数据和评估指标，确定了用于珊瑚白化警报的加热周数（DHWs）的优化阈值。南海的结果表明，首先，在珊瑚白化事件警报方面，CRW比CoRTAD表现更好。然而，使用4°C-周和8°C-周的常见DHW阈值时，两种产品都低估了珊瑚白化事件。其次，CRW用于珊瑚白化事件警报的DHW优化阈值为3.32°C-周，用于严重珊瑚白化事件警报的为4.52°C-周。对于CoRTAD产品，用于珊瑚白化事件警报的DHW优化阈值为2.36°C-周，用于严重珊瑚白化事件警报的为4.14°C-周。本研究提出了一种评估和优化多源珊瑚白化热应激产品警报能力的方法，可为珊瑚礁生态系统健康评估提供更准确的基础数据，并有助于全球珊瑚礁生态系统的保护和恢复。
