Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 01 to 31 August 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 01 to 31 August 2022.

为深入探究海洋无脊椎动物对环境变化的生理效应，需进行长期监测，以捕捉环境参数的自然变异性。唯有如此，实验结果方可与野外环境条件相联系，从而对海洋无脊椎动物，尤其是严苛的潮间带生物，在气温上升情况下的适应性作出更为精确的预测。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、渔业及环境部（DFFE）Sea Point研究水族馆的低pH条件下进行慢性孵化后，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，不仅需要栖息地温度，还需了解其阈值温度。后者通过检测临界热最大温度（CTmax），即生物表现出无协调运动反应的温度而获得，而栖息地温度则是通过在这些生物栖息的潮间池中部署温度记录器而获得的。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，每个池中放置两个记录器。在此，我们展示了来自第1池的温度测量数据（33.920317 S，18.379417 E，记录器10687237和20195550；第2池：33.920267 S，18.379417 E，记录器10687240和20195543；第3池：33.920167 S，18.379717 E，记录器20195539和20195574），时间范围为2022年8月1日至31日。