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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Depth-dependent temperature variability in the Southern California bight with implications for the cold-water gorgonian octocoral Adelogorgia phyllosclera
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Depth-dependent temperature variability in the Southern California bight with implications for the cold-water gorgonian octocoral Adelogorgia phyllosclera

机译：南加州深度的温度变异性，对冷水Gorgonian octocoral Adelogia phyllosclera的影响

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Cold-water corals are highly sensitive to changes in water temperature, as it is an important determinant of their distribution. In recent years, several heatwave events have occurred in multiple marine ecosystems, including the northeast Pacific Ocean. However, the effects of elevated ocean temperatures on cold-water corals are largely unknown. Determining the upper thermal limits of cold-water octocorals is an important first step in identifying if warm-water events pose a potential threat. Temperature data were obtained from loggers placed in the Channel Islands National Marine Sanctuary (CINMS) at 20, 50, 100, and 200 m prior to the 2015-2016 El Nino Southern Oscillation (ENSO) event and used to characterize warm-water anomalies. Live colonies of the common gorgonian octocoral, Adelogorgia phyllosclera, were collected from the CINMS using a remotely operated vehicle (ROV) and transported to laboratory aquaria where they were maintained. A laboratory study was conducted to investigate the upper thermal limit of A. phyllosclera during a series of temperature assays using coenenchyme health scores, polyp activity, and estimated survival. Results of in-situ temperature analyses indicated that warm water anomalies occurred frequently at 50 and 100 m, with most of these anomalies occurring during strong ENSO months. Based on the laboratory temperature assays, the upper thermal limit of A. phyllosclera was estimated to be 20 degrees C, with a time to effect of 96 hours. During the 2015-2016 ENSO event, this upper thermal limit was exceeded (21.1 degrees C) by warm-water anomalies at 20 m that lasted up to 14.1 hours, and approached (18.3 degrees C) by warm-water anomalies at 50 m that lasted up to 52.7 hours. Projections for future warm-water events suggest that the upper thermal limit of A. phyllosclera and other cold-water corals will likely be reached more frequently in the coming years. Thus, understanding the responses of cold-water corals to thermal stress will help predict the resilience of these species to future ocean warming.
机译：冷水珊瑚对水温变化非常敏感，因为它是它们分布的重要决定因素。近年来，多个海洋生态系统发生了几个热浪事件，包括东北太平洋。然而，海洋温度对冷水珊瑚的影响主要是未知的。确定冷水八陶瓷的上部热限制是识别温水事件造成潜在威胁的重要第一步。在2015-2016 El Nino Southern振荡（ENSO）事件之前，从通道岛国家海洋保护区（CINMS）中放置在通道群岛国家海洋保护区（CINMS）中的逻辑中获得了温度数据，并用于表征温水异常。使用远程操作的车辆（ROV）从Cinms收集常见的Gorgonian octocoral，Adelogorgia phyllosclera的活殖民地，并将其运输到维持的实验室水族馆。进行了实验室研究以研究使用Coenenchye Health Scores，息肉活动和估计存活期间A. phyllosclera的上部热极限。原位温度分析结果表明，温水异常经常发生在50和100米处，大部分这些异常在强大的enso几个月内发生。基于实验室温度测定，估计A.Phyllosclera的上部热极限为20℃，时间为96小时。在2015-2016 ENSO事件期间，通过20米的温水异常超过（21.1摄氏度），持续最高14.1小时，并通过温水异常（50米）接近（18.3摄氏度）持续最多52.7小时。未来的温水事件的预测表明，在未来几年中可能会更频繁地达到浮氏植物衣片和其他冷水珊瑚的上部热极限。因此，了解冷水珊瑚对热应力的反应将有助于预测这些物种对未来海洋变暖的影响。

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