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Recolonisation of new habitats by meiobenthic organisms in the deep Arctic Ocean: an experimental approach

机译：北冰洋深部的底栖生物对新栖息地的重新定殖：一种实验方法

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Commercial exploitation and abrupt changes of the natural conditions may have severe impacts on the Arctic deep-sea ecosystem. The present recolonisation experiment mimicked a situation after a catastrophic disturbance (e.g. by turbidites caused by destabilised continental slopes after methane hydrate decomposition) and investigated whether the recolonisation of a deep-sea habitat by meiobenthic organisms is fostered by variations in nutrition and/or sediment structure. Two "Sediment Tray Free Vehicles" were deployed for 1 year in summer 2003 at 2,500 m water depth in the Arctic deep-sea in the eastern Fram Strait. The recolonisation trays were filled with different artificial and natural sediment types (glass beads, sand, sediment mixture, pure deep-sea sediment) and were enriched with various types of food (algae, yeast, fish). After 1 year, meiobenthos abundances and various sediment-related environmental parameters were investigated. Foraminifera were generally the most successful group: they dominated all treatments and accounted for about 87 % of the total meiobenthos. Colonising meiobenthos specimens were generally smaller compared to those in the surrounding deep-sea sediment, suggesting an active recolonisation by juveniles. Although experimental treatments with fine-grained, algae-enriched sediment showed abundances closest to natural conditions, the results suggest that food availability was the main determining factor for a successful recolonisation by meiobenthos, and the structure of recolonised sediments was shown to have a subordinate influence.
机译：商业开发和自然条件的突然变化可能会对北极深海生态系统产生严重影响。本次重新定殖实验模拟了灾难性扰动后的情况（例如甲烷水合物分解后不稳定的大陆斜坡造成的浊流所致），并研究了营养和/或沉积物结构的变化是否促进了中生生物对深海生境的重新定殖。 。 2003年夏季，在弗拉姆海峡东部的北极深海中，在水深2500 m处部署了两辆“无底盘运输工具”，为期1年。再定殖盘充满了不同的人工和天然沉积物类型（玻璃珠，沙子，沉积物混合物，纯深海沉积物），并富含各种食物（藻类，酵母，鱼）。一年后，调查了底栖动物的丰度和各种与沉积物有关的环境参数。有孔虫通常是最成功的组：它们主导了所有治疗，约占总方法的87％。与周围深海沉积物相比，定殖的鱼虾标本通常要小一些，这表明幼鱼主动重新定殖。尽管对细粒藻类富集沉积物进行的实验处理显示出最接近自然条件的丰度，但结果表明，食物供应量是鱼栖底栖动物成功重新定殖的主要决定因素，而重新定殖的沉积物的结构也显示出从属影响。

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