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首页> 外文期刊>Marine ecology progress series >Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents
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Mixed species aggregations feeding upon herring and sandlance schools in a nearshore archipelago depend on flooding tidal currents

机译：以近海群岛的鲱鱼和沙眼鱼为食的混合物种聚集取决于洪流

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摘要

Tidal rips and jets are common features associated with archipelagos and complex coastlines. In habitats where rips and jets develop, energy flow to piscivorous predators is hypothesized to be strongly associated with tidal phase due to interactions between currents, plankton, and schooling planktivorous fishes (the 'tidal coupling hypothesis'). This study tests 1 component of the tidal coupling hypothesis, that the feeding activity of piscivorous predators and the availability of planktivorous fishes are both strongly associated with the same tidal phase. During 1994 to 1997, I made visual counts of actively feeding, mixed-species seabird flocks and hydroacoustic measurements of the relative abundance and distribution of schooling fishes. Median feeding activity, median backscatter m~(-1) transect, and median prey encounter probabilities were greatest during the tidal periods Slow flood 1 and Fast flood. Positive feeding anomalies and positive prey-encounter anomalies were significantly associated with tidal flood phases, but positive backscatter anomalies were not. The results support the tidal-coupling hypothesis, but suggest that changes in the distribution or behavior of schooling fish are as important as, if not more important than, changes in relative fish abundance when determining prey availability and predator foraging-success. The data show that tidal currents can play an important role in structuring nearshore predator-prey interactions.
机译：潮汐撕裂和急流是与群岛和复杂海岸线相关的常见特征。据推测，在有裂痕和喷射的栖息地中，由于洋流，浮游生物和养殖浮游鱼类之间的相互作用，流向食肉性捕食者的能量流与潮汐阶段密切相关（“潮汐耦合假说”）。这项研究检验了潮汐耦合假说的1个组成部分，即食鱼性捕食者的摄食活动和浮游鱼类的可用性均与同一潮汐期密切相关。在1994年至1997年期间，我对主动喂食，混合物种海鸟群和水声法对养殖鱼类的相对丰度和分布进行了视觉计数。在潮汐缓慢1和快速洪水的潮汐时期，中值摄食活动，中值反向散射m〜（-1）横断面和中值猎物遇到概率最大。积极的摄食异常和与猎物相遇的异常与潮汐洪水时期显着相关，但积极的反向散射异常却没有。结果支持潮汐耦合假说，但表明在确定猎物的可获得性和捕食者觅食成功率时，放养鱼类分布或行为的变化与相对鱼类丰度的变化同等重要。数据表明，潮流在构造近岸捕食者与猎物的相互作用中可以发挥重要作用。

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