Seawater temperature in the microhabitats of intertidal marine invertebrates in Sea Point, South Africa, 01 February to 24 February 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 01 February to 24 February 2020.

为了更深入地理解海洋无脊椎动物对环境条件变化的生理效应，需要长期监测以捕捉环境参数的自然变异性。通过这种方式，可以将实验结果与实地条件相联系，并更准确地预测海洋无脊椎动物，特别是在严酷的潮间带地区，如何应对温度上升。2020年5月，我们从南非西南海岸的Sea Point潮间带岩石池中收集了海胆（Parechinus angulosus）。在环境、林业和渔业部（DEFF）的Sea Point研究水族馆中进行了长期孵化后，在低pH条件下，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窗，需要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），即生物体出现不协调运动反应的温度而获得，而栖息地温度则通过在生物体栖息的潮间池中部署温度记录仪来获取。在Cape Town的Sea Point选择了三个显著的岩石池（相距超过5米）来安装HOBO TidbiT温度记录仪。每个池中放置了两个记录仪。在此，我们展示了Pool 1的温度测量数据，坐标为33.920317 S，18.379417 E，记录仪编号为10687237和20195550；Pool 2的坐标为33.920267 S，18.379417 E，记录仪编号为10687240和20195554；Pool 3的坐标为33.920167 S，18.379717 E，记录仪编号为20195539和20195574，数据采集时间为2020年2月1日至2月24日。