Dissolved oxygen and temperature best predict deep-sea fish community structure in the Gulf o California with climate change implications
Dissolved oxygen and temperature best predict deep-sea fish community structure in the Gulf o California with climate change implications
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DOI：
10.3354/meps13240
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发表时间：
2020-03-05
影响因子：
2.5
通讯作者：
Barry, James P.
中科院分区：
文献类型：
--
作者：
Gallo, Natalya D.;Beckwith, Maryanne;Barry, James P.
自然梯度系统可用于研究深海群落对气候变化的脆弱性。加州湾是研究深海群落动物群格局与环境条件之间关系的理想系统，因为深海条件从北部温暖和富氧到南部寒冷和严重缺氧。蒙特利湾水族馆研究所（MBARI）的远程操作的车辆（船）的“博士里基茨”被用来进行海底视频断面深度为-200-1400米的北方，中部和南部海湾。群落组成，密度和多样性的底层鱼类组合进行了比较，环境条件。我们测试的假设，气候相关的变量（温度，氧气和初级生产）有更多的解释力比静态变量（纬度，深度和底栖基质）在解释鱼类群落结构的变化。温度最能解释密度的变化，而氧气最能解释多样性和群落组成的变化。密度和多样性都随着氧气的减少而下降，但多样性在较高的氧气阈值（-7 μ mol kg（-1））下下降。值得注意的是，高密度的鱼类群落被观察到生活在亚氧条件下（
Natural gradient systems can be used to examine the vulnerability of deep-sea communities to climate change. The Gulf of California presents an ideal system for examining relationships between faunal patterns and environmental conditions of deep-sea communities because deep-sea conditions change from warm and oxygen-rich in the north to cold and severely hypoxic in the south. The Monterey Bay Aquarium Research Institute (MBARI) remotely operated vehicle (ROV) 'Doc Ricketts' was used to conduct seafloor video transects at depths of -200-1400 m in the northern, central, and southern Gulf. The community composition, density, and diversity of demersal fish assemblages were compared to environmental conditions. We tested the hypothesis that climate-relevant variables (temperature, oxygen, and primary production) have more explanatory power than static variables (latitude, depth, and benthic substrate) in explaining variation in fish community structure. Temperature best explained variance in density, while oxygen best explained variance in diversity and community composition. Both density and diversity declined with decreasing oxygen, but diversity declined at a higher oxygen threshold (-7 mu mol kg(-1)). Remarkably, high-density fish communities were observed living under suboxic conditions (