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

为深入探究海洋无脊椎动物对环境变化生理效应的响应，有必要进行长期监测，以捕捉环境参数的自然变异性。通过此方法，实验结果可关联至实地环境条件，从而对海洋无脊椎动物，特别是在严苛的潮间带区域，如何应对气温上升作出更精确的预测。2020年5月，从南非西南海岸的Sea Point潮间带岩石池中收集了海胆（Parechinus angulosus）。在南非林业、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，近期实验中对它们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范围，既需要栖息地温度，也需要它们的阈值温度。后者通过考察临界热最大温度（CTmax），即生物表现出不协调运动反应的温度获得，而栖息地温度则通过在生物栖息的潮间池中部署温度记录器获取。在距离超过5米的三个显著岩石池（Sea Point, Cape Town）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2023年2月27日至3月27日。