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Regime shifts in fish recruitment on the Northeast US Continental Shelf

机译：美国东北大陆架鱼类招募制度的变化

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There is accumulating evidence for decadal-scale regime shifts at the base of the food web on the Northeast US Continental Shelf. However, less evidence exists for regime shifts in fish recruitment success, particularly for synchronized regimes across multiple species. Here, we analyzed stock assessment output and survey data to test for regimes in the recruitment success of 18 commercially important marine species over a 29 yr timespan. We then tested whether recruitment regimes coincide with regimes in the zooplankton community, and whether the abundance of large spawners could explain the patterns in recruitment. We found evidence for 3 decadal-scale recruitment regimes: low recruitment success in the 1980s, high success in the 1990s, and a return to low recruitment success in the 2000s. This general pattern was found in all datasets of recruitment. The abundance of large spawners did not appear to be a broad-scale driver of recruitment success; however, recruitment regimes coincided with regimes in copepod abundance and size structure.
机译：在美国东北大陆架上的食物网基础上，有越来越多的证据表明年代际规模的变化。但是，鲜有关于鱼类招募成功的制度转变的证据，尤其是针对多个物种的同步制度。在这里，我们分析了种群评估输出和调查数据，以测试在29年时间内18种重要商业海洋物种的成功招募制度。然后，我们测试了招募制度是否与浮游动物群落的制度相吻合，以及是否有大量的大产卵者可以解释招募的方式。我们发现了三个十年规模的招募制度的证据：1980年代招募成功率低，1990年代招募成功率高以及2000年代招募成功率低。在招聘的所有数据集中都可以找到这种一般模式。大量的大型产卵场似乎并没有大规模地推动招聘成功；但是，征聘制度与co足类的数量和规模结构相吻合。

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