Drivers of temporal beta diversity of a benthic community in a seasonally hypoxic ocean fjord

Global expansion of oxygen deficient (hypoxia) waters will have detrimental effects on marine life in the Northeast Pacific Ocean (NEP) where some of the largest proportional losses in aerobic habitat are predicted to occur. However, few studies have accounted for the high environmental variability in this region while including natural community-assembly dynamics. Here, we present results from a 14-month deployment of a benthic camera platform tethered to the VENUS cabled observatory in the seasonally hypoxic Saanich Inlet. Our time series continuously-recorded, natural cycles of deoxygenation and reoxygenation that allowed us to test whether a community from the NEP showed hysteresis in its recovery compared to hypoxia-induced decline and to address the processes driving temporal beta diversity under variable states of hypoxia. Using high-frequency ecological time series we reveal (1) differences in the response and recovery of the epibenthic community are rate-limited by recovery of ...全球缺氧（hypoxia）水体的扩张将对东北太平洋（Northeast Pacific Ocean, NEP）的海洋生物产生不利影响，该区域被预测为需氧生境（aerobic habitat）比例损失最大的区域之一。然而，鲜有研究在纳入自然群落组装动态的同时，兼顾该区域的高环境变异性。本研究在季节性缺氧的萨尼奇湾，部署了系泊于VENUS有线观测站的底栖摄像平台，开展了为期14个月的观测。本研究的时间序列连续记录了脱氧（deoxygenation）与复氧（reoxygenation）的自然循环，借此得以检验东北太平洋的某一群落在缺氧诱导的衰退之后，其恢复过程是否存在滞后效应（hysteresis），并解析了在缺氧状态可变的条件下驱动时间性β多样性（temporal beta diversity）变化的过程。借助高频生态时间序列，我们揭示了（1）底表群落（epibenthic community）的响应与恢复过程的差异，其速率受限于……