Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, 01 to 28 September 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 28 September 2022.

为更深刻地领会海洋无脊椎动物对环境条件变化的生理影响，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，可以将实验发现与野外条件联系起来，并更精确地预测海洋无脊椎动物，特别是在恶劣的潮间带地区，如何应对气温的上升。2020年5月，从南非西南海岸的Sea Point潮间带岩石池中采集了Cape海胆（Parechinus angulosus）。在林业、渔业和环境部（DFFE）的Sea Point研究水族馆进行长期低pH条件孵化后，最近的研究试验中调查了其对热应激的反应。为了计算这些海洋无脊椎动物的热适应窗口，不仅需要栖息地温度，还需要它们的阈值温度。后者通过检查临界热最大温度（CTmax），即生物表现出无协调运动反应的温度获得，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器获得。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温度记录器。每个池中放置了两个记录器。在此，我们展示了来自池1的温度测量数据的整理版本：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，时间范围从2022年9月1日至28日。