Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 4 April to 9 May 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 4 April to 9 May 2023.

为深入探究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，可以将实验结果与现场条件相关联，并更精确地预测海洋无脊椎动物，特别是在恶劣的潮间带，如何应对气温的升高。2020年5月，在南非西南海岸的Sea Point潮间带岩石池中收集了海胆（Parechinus angulosus）。在林业、渔业和环境部（DFFE）的Sea Point研究水族馆中进行了低pH条件下的长期孵化后，近期实验中对这些动物对热应激的反应进行了调查。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及其阈值温度。后者通过分析临界热最大温度（CTmax）获得，即生物表现出无协调运动反应的温度，而栖息地温度则通过在这些生物栖息的潮间池中部署温度记录仪来获得。选择了三个显著的岩石池（Sea Point, Cape Town，相距超过5米）来安装HOBO TidbiT温度记录仪，每个池子放置两个记录仪。在此，我们展示了来自第1池的清洗后的温度测量数据：纬度33.920317 S，经度18.379417 E，记录仪编号10687237和20195550；第2池：纬度33.920267 S，经度18.379417 E，记录仪编号10687240和20195543；第3池：纬度33.920167 S，经度18.379717 E，记录仪编号20195539和20195574，数据采集时间从2023年4月4日至5月9日。