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首页> 外文期刊>Polar biology >Seasonal changes in foraminiferal assemblages along environmental gradients in Adventfjorden (West Spitsbergen)
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Seasonal changes in foraminiferal assemblages along environmental gradients in Adventfjorden (West Spitsbergen)

机译：Adventfjorden（西斯匹次卑尔根州）沿环境梯度的有孔虫组合的季节性变化

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摘要

Foraminifera are numerically abundant components of the benthic fauna; thus, they are very important compounds in glaciomarine environments. However, ongoing oceanographic changes may influence their distribution, abundances and diversity differently at different times of the year. In the present study, we aimed to assess seasonal environmental changes in an Arctic fjord (Adventfjorden, W Spitsbergen) and the structure and distribution of benthic foraminiferal assemblages during four seasons (January, May, August, November). The study revealed that the benthic foraminiferal assemblages in Adventfjorden are susceptible to environmental changes related to enhanced inflow of shelf-transformed water (STW). We distinguished three zones in the fjord: (1) the deeper outer part influenced by STW, with living specimens staying in the few uppermost layers of sediment, (2) the shallower interior influenced by freshwater outflows and high sediment load, resulting in the dominance of opportunistic glaciomarine taxa constantly buried in the sediment, and (3) the central part, where the seasonal variation in the foraminifera assemblage reflects the interplay between the influence of riverine inputs and STW. Our study also revealed that the presence of STW in Adventfjorden favours an early spring appearance of juvenile foraminifera; however, the majority of the specimens are later withered and do not contribute to the summer pool of mature individuals. On the other hand, the majority of the mature specimens can survive during the winter because of sufficient organic matter stocks and year-long ice-free conditions.
机译：有孔虫是底栖动物数量丰富的组成部分。因此，它们在冰川海洋环境中是非常重要的化合物。但是，持续的海洋变化可能会在一年中的不同时间以不同的方式影响其分布，丰度和多样性。在本研究中，我们旨在评估北极峡湾（Adventfjorden，W Spitsbergen）的季节性环境变化以及四个季节（1月，5月，8月，11月）底栖有孔虫组合的结构和分布。该研究表明，Adventfjorden的底栖有孔虫群落易受环境变化的影响，这些变化与陆架转化水（STW）的流入量增加有关。我们区分了峡湾的三个区域：（1）受STW影响的较深外部，活体标本停留在最少量的沉积物上层；（2）受淡水流出和高沉积物负荷影响的较浅内部，导致了优势机会海洋冰川海洋分类单元不断地埋藏在沉积物中，（3）中心部分，有孔虫组合的季节性变化反映了河流输入与STW之间的相互作用。我们的研究还表明，在Adventfjorden中STW的存在有利于幼孔虫的早春出现。但是，大多数标本后来都枯萎了，对成熟个体的夏季活动没有帮助。另一方面，由于足够的有机物储备和长达一年的无冰条件，大多数成熟标本可以在冬季生存。

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