School of Life and Environmental Sciences, The University of Sydney, Camperdown, Sydney, NSW, 2006, Australia.
Climate Change Cluster, University of Technology, Ultimo, Sydney, NSW, 2007, Australia.
Sci Rep. 2024 Sep 5;14(1):20688. doi: 10.1038/s41598-024-71534-9.
Climate change is causing ocean warming (OW) and increasing the frequency, intensity, and duration of extreme weather events, including Marine Heat Waves (MHWs). Both OW and MHWs pose a significant threat to marine ecosystems and marine organisms, including oysters, oyster reefs and farmed oysters. We investigated the survival and growth of juveniles of two commercial species of oyster, the Sydney rock oyster, Saccostrea glomerata, and the Pacific oyster, Crassostrea gigas, to elevated seawater temperatures reflecting a moderate and an extreme MHW in context with recent MHWs and beyond. The survival and size of Pacific oysters to moderate MHWs (22-32 °C; 14 days) was greater than that for Sydney rock oysters (24-32 °C; 15 days). While survival and growth of both species was significantly impacted by extreme MHWs (29-38 °C; 5-6 days), Sydney rock oysters were found to survive greater temperatures compared to the Pacific oyster. Overall, this study found that Pacific oyster juveniles were more tolerant of a moderate MHW, while Sydney rock oyster juveniles were more resilient to extreme MHWs. These differences in thermal tolerance may have consequences for aquaculture and coexistence of both species in their intertidal and latitudinal distributions along the south-eastern Australian coastline.
气候变化导致海洋变暖（OW），并增加了极端天气事件的频率、强度和持续时间，包括海洋热浪（MHWs）。OW 和 MHWs 都对海洋生态系统和海洋生物构成了重大威胁，包括牡蛎、牡蛎礁和养殖牡蛎。我们研究了两种商业牡蛎品种——悉尼岩牡蛎（Saccostrea glomerata）和太平洋牡蛎（Crassostrea gigas）的幼体在反映中度和极端 MHW 的升高海水中的生存和生长情况，这与最近的 MHW 及以后的情况有关。在中度 MHWs（22-32°C；14 天）下，太平洋牡蛎的存活率和大小大于悉尼岩牡蛎（24-32°C；15 天）。虽然两种物种的生存和生长都受到极端 MHWs（29-38°C；5-6 天）的显著影响，但与太平洋牡蛎相比，悉尼岩牡蛎能够在更高的温度下存活。总的来说，这项研究发现，太平洋牡蛎幼体对中度 MHW 的耐受性更强，而悉尼岩牡蛎幼体对极端 MHWs 的恢复能力更强。这种耐热性的差异可能对水产养殖和这两个物种在东南澳大利亚海岸线的潮间带和纬度分布中的共存产生影响。
