Reef fish assemblages are exposed to a wide range of anthropogenic threats as well as chronic natural disturbances. In upwelling regions, for example, there is a seasonal influx of cool nutrient-rich waters that may shape the structure and composition of reef fish assemblages. Given that climate change may disrupt natural oceanographic processes by altering the frequency and strength of natural disturbances, understanding how fish assemblages respond to upwelling events is essential to effectively manage reef ecosystems under changing ocean conditions. In this study, we used baited remote underwater video stations (BRUVS) and traditional underwater visual census (UVC) to investigate spatiotemporal patterns of reef fish assemblages in an upwelling region in the North Pacific of Costa Rica. We recorded a total of 183 reef fish species from 60 families, of which 166 species were detected by BRUVS and 122 by UVC. Only 66% of all species were detected by both methods. Our study showed that the upwelling had an important role in shaping reef fish assemblages in this region, but there was also a significant interaction between upwelling and location. In addition, other drivers such as habitat complexity and habitat composition also had an effect on reef fish abundances and species. To our knowledge, this is the first study in the Eastern Tropical Pacific that combines BRUVS and UVC to monitor reef fish assemblages in an upwelling region, which provides more detailed information to assess the state of reef ecosystems in response to multiple threats and changing ocean conditions. This article is protected by copyright. All rights reserved.

中文翻译：

---

东热带太平洋上升流区域珊瑚鱼群落的驱动因素

珊瑚礁鱼类群落受到广泛的人为威胁以及慢性自然干扰。例如，在上升流地区，季节性的、富含营养的凉爽海水可能会影响珊瑚鱼群的结构和组成。鉴于气候变化可能会通过改变自然干扰的频率和强度来破坏自然海洋学过程，因此了解鱼类组合如何响应上升流事件对于在不断变化的海洋条件下有效管理珊瑚礁生态系统至关重要。在这项研究中，我们使用带诱饵的远程水下视频站 (BRUVS) 和传统的水下视觉普查 (UVC) 来调查哥斯达黎加北太平洋上升流地区珊瑚鱼群落的时空模式。我们共记录了 60 个科的 183 种珊瑚鱼，其中 BRUVS 检测到 166 种，UVC 检测到 122 种。两种方法仅检测到所有物种的 66%。我们的研究表明，上升流对塑造该地区的珊瑚礁鱼类群落具有重要作用，但上升流与位置之间也存在显着的相互作用。此外，栖息地复杂性和栖息地组成等其他驱动因素也对珊瑚礁鱼类的丰度和物种产生影响。据我们所知，这是东热带太平洋的第一项研究，结合 BRUVS 和 UVC 来监测上升流区域的珊瑚礁鱼类组合，提供更详细的信息来评估珊瑚礁生态系统的状态，以应对多重威胁和不断变化的海洋条件. 本文受版权保护。版权所有。