Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, South Africa, 21 September to 12 November 2020

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 Environment, Forestry and Fisheries' (DEFF) 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 in 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 20195554; Pool 3: 33.920167 S, 18.379717 E, logger 20195539 and 20195574, from 21 September to 12 November 2020.

为了深入理解海洋无脊椎动物对环境条件变化的生理效应，有必要进行长期监测，以捕捉环境参数的自然变异性。通过这种方式，可以将实验结果与现场条件联系起来，并对海洋无脊椎动物，尤其是在恶劣的潮间带，如何应对温度上升做出更准确的预测。2020年5月，从位于南非西南海岸Sea Point的潮间带岩石池中采集了海胆，学名为Parechinus angulosus。在环境、林业和渔业部（DEFF）Sea Point研究水族馆的低pH条件下进行长期孵化后，近期实验试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窗，需要同时考虑栖息地温度以及它们的阈值温度。后者通过检查临界热最大温度（CTmax），即生物表现出不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来获取的。在Cape Town的Sea Point选择了三个突出的岩石池（彼此相隔超过5米）来安装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的温度测量数据的清洗版本：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20195554；池3：南纬33.920167度，东经18.379717度，记录器编号20195539和20195574，时间范围为2020年9月21日至11月12日。