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首页> 外文期刊>Marine ecology progress series >Growth of planktivorous bay anchovy Anchoa mitchilli, top-down control, and scale-dependence in estuarine mesocosms
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Growth of planktivorous bay anchovy Anchoa mitchilli, top-down control, and scale-dependence in estuarine mesocosms

机译：河口中生壁上的板状海湾an鱼An鱼的生长，自上而下的控制和尺度依赖性

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摘要

Growth of the zooplanktivorous bay anchovy Anchoa mitchilli and its potential to control plankton communities were investigated in estuarine mesocosms. The effects of mesocosm dimensions (size and shape) on anchovy growth and grazing impact were evaluated in 2 experiments, of 6 and 15 wk duration, respectively. Estuarine mesocosms of 1 and 10 m~3 volume and 2 shapes were used. The size-shape differences provided mesocosms with 3 volume-to-wall area ratios that determined how 'pelagic' the enclosures were. Anchovy growth rates scaled directly with mesocosm size and with mesocosm volume:wall area ratio. Growth was slowest in the least 'pelagic' enclosures, and fastest in the most 'pelagic' enclosures. The fish had a clear top-down impact on copepod populations. Mesocosms without fish supported copepods that were larger in size and of higher community biomass. Highest anchovy growth rates (and presumed consumption) occurred in mesocosms with lower mean copepod biomasses, further suggesting top-down control. Although not conclusive, trends in trophic relationships were consistent and supportive of the trophic cascade hypothesis. Mesocosms with high mean copepod biomasses tended to have low mean phytoplankton densities, and mesocosms with high anchovy growth rates tended to have high phytoplankton densities. There was no consistent evidence that top-down control by bay anchovy was related to mesocosm sizes or dimensions.
机译：在河口中观世界中研究了浮游动物的海湾an鱼的生长及其控制浮游生物群落的潜力。在2个实验中分别评估了中观宇宙尺寸（大小和形状）对an鱼生长和放牧影响的影响，持续时间分别为6周和15周。使用体积为1和10 m〜3且形状为2个形状的河口内膜。大小形状的差异为中观提供了3个体积与壁面积之比，这些比例决定了外壳的“浮游式”。 me鱼的生长速度直接取决于中观的大小和中观的体积与壁之比。增长最少的“中上层”地区增长最快，而增长最多的“中上层”地区增长最快。这条鱼对co足类种群有明显的自上而下的影响。没有鱼类的介壳动物支持pe足类，co足类的体型更大，群落生物量更高。 me鱼最高的growth鱼生长速率（和估计的消耗量）发生在平均co足类生物量较低的中胚层中，这进一步表明自上而下的控制。尽管不是结论性的，但营养关系的趋势是一致的，并支持营养级联假说。 co足类生物量平均数高的中观空间平均浮游植物密度较低，cho鱼生长率高的中观空间则具有较高的浮游植物密度。没有一致的证据表明海湾bay鱼自上而下的控制与中观宇宙的大小或尺寸有关。

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