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首页> 外文期刊>Philosophical Transactions of the Royal Society of London, Series B. Biological Sciences >Synchronous marine pelagic regime shifts in the Northern Hemisphere
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Synchronous marine pelagic regime shifts in the Northern Hemisphere

机译:北半球海洋中上层海相同步转变

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Regime shifts are characterized by sudden, substantial and temporally persistent changes in the state of an ecosystem. They involve major biological modifications and often have important implications for exploited living resources. In this study, we examine whether regime shifts observed in 11 marine systems from two oceans and three regional seas in the Northern Hemisphere (NH) are synchronous, applying the same methodology to all. We primarily infer marine pelagic regime shifts from abrupt shifts in zooplankton assemblages, with the exception of the East Pacific where ecosystem changes are inferred from fish. Our analyses provide evidence for quasi-synchronicity of marine pelagic regime shifts both within and between ocean basins, although these shifts lie embedded within considerable regional variability at both year-to-year and lower-frequency time scales. In particular, a regime shift was detected in the late 1980s in many studied marine regions, although the exact year of the observed shift varied somewhat from one basin to another. Another regime shift was also identified in the mid-to late 1970s but concerned less marine regions. We subsequently analyse the main biological signals in relation to changes in NH temperature and pressure anomalies. The results suggest that the main factor synchronizing regime shifts on large scales is NH temperature; however, changes in atmospheric circulation also appear important. We propose that this quasi-synchronous shift could represent the variably lagged biological response in each ecosystem to a large-scale, NH change of the climatic system, involving both an increase in NH temperature and a strongly positive phase of the Arctic Oscillation. Further investigation is needed to determine the relative roles of changes in temperature and atmospheric pressure patterns and their resultant teleconnections in synchronizing regime shifts at large scales.
机译:政权转移的特征是生态系统状态的突然,实质和暂时的变化。它们涉及重大的生物学修饰,通常对已开发的生物资源具有重要意义。在这项研究中,我们研究了在北半球(NH)的两个海洋和三个区域海的11个海洋系统中观察到的政权转移是否是同步的,并且对所有对象应用了相同的方法。我们主要根据浮游动物组合的突然变化来推断海洋中上层政权的变化,但东太平洋地区除外,那里的生态系统变化是由鱼类推断出来的。我们的分析提供了海洋盆地内部和海洋盆地之间海洋中上层政权转变的准同步性证据,尽管这些转变嵌入在年际和低频时间尺度上相当大的区域变化中。特别是,在1980年代后期,在许多研究过的海洋区域中都发现了政权转移,尽管观测到的转移的确切年份从一个盆地到另一个盆地有所不同。在1970年代中期至后期也发现了另一种政权转移,但涉及的海洋区域较少。随后,我们分析了与NH温度和压力异常变化有关的主要生物学信号。结果表明,大范围同步化机理转变的主要因素是NH温度。但是,大气环流的变化也显得很重要。我们认为,这种准同步转变可以表示每个生态系统对气候系统的大规模NH变化的生物滞后生物学响应,这既包括NH温度的升高,也包括北极涛动的强烈正相。需要进一步研究以确定温度和大气压模式变化及其产生的遥相关在大规模同步状态转换中的相对作用。

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