Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 27 January to 27 February 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 27 January to 27 February 2023.

为深入理解海洋无脊椎动物对环境条件变化的生理效应，需进行长期监测，以捕捉环境参数的自然变异性。唯有如此，方可将实验结果与野外环境相联系，并作出更为精准的预测，即海洋无脊椎动物，尤其是处于恶劣潮间带的物种，在气温上升的情况下将如何应对。2020年5月，从位于南非西南海岸Sea Point潮间带岩石池中采集了海胆物种Parechinus angulosus。在林业、渔业和环境部（DFFE）Sea Point研究水族馆的低pH条件下进行长期孵化后，近期实验中对这些生物的热应激反应进行了研究。为计算这些海洋无脊椎动物的热耐受范围，既需要了解其栖息地温度，亦需明确其阈值温度。后者通过检测临界热最大温度（CTmax），即生物出现不协调运动反应的温度而获得，而栖息地温度则可通过在生物栖息的潮间池中部署温度记录仪来获取。选择了三个显著的岩石池——Sea Point，Cape Town（相距超过5米）——安装HOBO TidbiT温度记录仪，每个池中放置两个记录仪。在此，我们展示了来自第1池的清洁后的温度测量数据：33.920317 S，18.379417 E，记录仪编号10687237和20195550；第2池：33.920267 S，18.379417 E，记录仪编号10687240和20195543；第3池：33.920167 S，18.379717 E，记录仪编号20195539和20195574，数据采集时间从2023年1月27日至2月27日。