Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 28 March to 4 April 2023

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 28 March to 4 April 2023.

为更深入地理解海洋无脊椎动物对环境变化生理效应的响应，有必要进行长期的监测，以捕捉环境参数的自然变异性。通过这种方式，实验结果可以与野外条件相联系，从而对海洋无脊椎动物，特别是在恶劣的潮间带，如何应对温度上升作出更准确的预测。2020年5月，来自南非西南海岸Sea Point潮间带岩石池中的海胆（Parechinus angulosus）被收集。在林业、渔业和环境部（DFFE）Sea Point研究水族馆的长期低pH条件下孵化后，近期实验中对其对热应激的反应进行了研究。为了计算这些海洋无脊椎动物的热耐受窗口，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），即生物体表现出无协调运动能力的温度而获得，而栖息地温度则通过在这些生物体栖息的潮间池中部署温度记录器来获取。选定了三个显著的岩石池（Sea Point, Cape Town，相距超过5米）来安装HOBO TidbiT温度记录器，每个池中放置两个记录器。在此，我们展示了池1的温度测量数据清理版本：南纬33.920317度，东经18.379417度，记录器编号10687237和20195550；池2：南纬33.920267度，东经18.379417度，记录器编号10687240和20195543；池3：南纬33.920167度，东经18.379717度，记录器编号20195539和20195574，数据采集时间为2023年3月28日至4月4日。