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首页> 外文期刊>Marine biology >Persistent near-bottom aggregations of mesopelagic animals along the North Carolina and Virginia continental slopes
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Persistent near-bottom aggregations of mesopelagic animals along the North Carolina and Virginia continental slopes

机译：北卡罗莱纳州和弗吉尼亚州大陆斜坡的中生动物的持久近底部聚集

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摘要

Submersible observations during four missions over the North Carolina and Virginia continental slopes (184-900 m) documented the occurrence of large aggregations of mesopelagic fishes and macronektonic invertebrates near or on the bottom. Aggregated mesopelagics formed a layer up to tens of meters deep positioned from a few centimeters to 20 m, usually < 10 m, above the substrate. Aggregations were numerically dominated by microvores, notably the myctophid fish Ceratoscopelus maderensis and the penaeid shrimp Sergestes arcticus. Consistently present but in relatively lower numbers, were mesopelagic predators, including the paralepidids Notolepis rissoi and Lestidium atlanticum, the eel Nemichthys scol-opaceus, the stomiid fishes Chauliodus sloani and Stomias boa ferox, and squids Illex spp. Near-bottom aggregations do not appear to be an artifact due to attraction to the submersible. Based on submersible observations in three areas in 4 years spanning a decade, near-bottom aggregations of midwater organisms appear to be a geographically widespread and persistent phenomenon along the continental slope of the southeastern US Aggregations may exploit areas of enhanced food resources at the bottom.
机译：在北卡罗莱纳州和弗吉尼亚州大陆斜坡（184-900 m）上进行的四个任务中的潜水观测结果表明，在附近或底部存在大量中生鱼类和大型中性无脊椎动物。聚集的中上层层在基底上方几厘米至20 m（通常<10 m）处形成了长达数十米的深度。聚集体在数量上受微孔的支配，特别是肉食性鱼类（Ceratoscopelus maderensis）和对虾对虾（Sergestes arcticus）。中生掠食性鱼类始终存在，但数量相对较少，包括副伤寒者Notolepis rissoi和大西洋Lestidium，鳗鱼Nemichthys scol-opaceus，stomiid鱼Chauliodus sloani和Stomias boa ferox以及鱿鱼Illex spp。由于对潜水器的吸引，近底部的聚集似乎不是伪像。根据十年来在四年中在三个区域中的潜水观测结果，中水生物的近底部聚集似乎是美国东南部大陆斜坡上地理分布广泛且持久的现象。聚集可能利用了底部食物资源增强的地区。

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