Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 27 October to 27 November 2022

To better understand the physiological effects of marine invertebrates to changing environmental conditions, long-term monitoring which captures the natural variability of environmental parameters is required. In this way, experimental findings can be related back to field conditions, and better predictions can be made as to how marine invertebrates, particularly in the harsh intertidal, will fair with rising temperature. In May 2020, Cape Sea Urchins, Parechinus angulosus, were collected from intertidal rock pools at Sea Point, which is situated along the southwest coast of South Africa. After chronic incubation in low pH conditions at The Department of Forestry, Fisheries and the Environment's (DFFE) Sea Point Research Aquarium, their response to thermal stress was investigated in recent experimental trials. To calculate the thermal window for these marine invertebrates, both habitat temperatures, as well as their threshold temperatures are required. The latter was obtained by examining the Critical Thermal Maximum temperatures (CTmax), i.e. the temperatures at which organisms respond with uncoordinated mobility, whereas habitat temperatures are available through the deployment of temperature loggers in the intertidal pools inhabited by these organisms. Three prominent rockpools were chosen Sea Point, Cape Town (>5 m apart) to install HOBO TidbiT temperature loggers. Two loggers were placed in each pool. Here we present the cleaned up version of temperature measurements from Pool 1: 33.920317 S, 18.379417 E, logger 10687237 and 20195550; Pool 2: 33.920267 S, 18.379417 E, logger 10687240 and 20195543; Pool 3: 33.920167 S, 18.379717 E, logger 20195539 and 20195574, from 27 October to 27 November 2022.

为深入探讨海洋无脊椎动物对环境变化生理效应的理解，有必要进行长期监测，以捕捉环境参数的自然变异性。通过这种方式，可以将实验结果与实地条件相联系，并就海洋无脊椎动物，尤其是处于恶劣潮间带的无脊椎动物，在气温上升的情况下如何应对做出更准确的预测。2020年5月，从南非西南海岸的Sea Point潮间带岩石池中采集了海胆（Parechinus angulosus）。在林业、渔业和环境部（DFFE）的Sea Point研究水族馆中进行了长期孵化，孵化条件为低pH值。在最近的实验试验中，研究了它们对热应激的反应。为了计算这些海洋无脊椎动物的热适应窗口，需要同时考虑栖息地温度和它们的阈值温度。后者通过检查临界热最大温度（CTmax），即生物表现出无协调运动能力的温度获得，而栖息地温度则可通过在由这些生物栖息的潮间池中部署温度记录器获得。在距离Sea Point, Cape Town超过5米的三个显著的岩石池中安装了HOBO TidbiT温度记录器。每个池中放置了两个记录器。在此，我们展示了来自第1池的清洗后的温度测量数据：南纬33.920317度，东经18.379417度，记录器编号10687237和20195550；第2池：南纬33.920267度，东经18.379417度，记录器编号10687240和20195543；第3池：南纬33.920167度，东经18.379717度，记录器编号20195539和20195574，数据收集时间从2022年10月27日至11月27日。