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首页> 外文期刊>Polar biology >Meiofaunal (re)colonization Of The Arctic Intertidal (hornsund, Spitsbergen) After Ice Melting: Role Of Wrack Deposition
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Meiofaunal (re)colonization Of The Arctic Intertidal (hornsund, Spitsbergen) After Ice Melting: Role Of Wrack Deposition

机译：冰融化后北极潮间带（霍恩松德河，斯匹次卑尔根河）的变角（重新）定植：残骸沉积的作用

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摘要

Intertidal meiobenthos of Homsund-the southernmost fjord of Spitsbergen-was investigated between July and September 2005. Mean total meiofaunal densities ranged between 4.3 and 328 ind. 10 cm~(-2). Nema-tode assemblages were impoverished in terms of the number of genera when compared with those from the western Spitsbergen coast (11 vs. 25-28 genera in total, respectively). It is suggested that severe environmental conditions in the southern part of Spitsbergen overcome the adaptation skills of many nematode species and hamper the establishment of a diverse community. Comparatively high nematode numbers on a beach subject to heavy macroalgal wrack input contrast sharply with numerically poor communities in sparse-wrack beaches (up to 315 vs. 31 ind. 10 cm~(-2), respectively). It is suggested that the wrack input to the Arctic beach may substantially influence the richness and composition of the intertidal meiobenthic community. Nematode assemblages were dominated by extreme colonizers: Geomonhystera disjuncta and rhabdit-ids. Their relatively high densities in beach sediments recorded at the beginning of July indicate their ability to recover rapidly after the winter period and to effective (re)colonization of the intertidal habitat just after the ice melt. Average concentration of rhabditids and monhyster-ids associated with macroalgal wrack deposited on the upper shore was as high as 52 × 10~3 individuals per gram of the substrate. It is hypothesized that nematodes can play a substantial role in the wrack decomposition in the Arctic intertidal.
机译：2005年7月至2005年9月，对Spitsbergen最南端的峡湾Homsund的潮间带底栖动物进行了调查。平均总动植物密度在4.3至328 ind之间。 10厘米〜（-2）与属西部斯匹次卑尔根海岸的属相比，Nema-tode组合的属数贫乏（分别为11和25-28属）。有人认为，斯匹次卑尔根州南部的严酷环境条件克服了许多线虫物种的适应能力，并阻碍了多样化社区的建立。受到大量藻类沉没输入的海滩上相对较高的线虫数量与稀疏沉着海滩上数量较少的群落形成鲜明对比（分别高达315和31 ind。10 cm〜（-2））。有人认为，向北极海滩输入的沉船可能会严重影响潮间带底栖动物群落的丰富程度和组成。线虫组合主要由极端定居者控制：土生单胞菌和鼠疫。他们在7月初记录的相对较高的海滩沉积物密度表明，它们具有在冬季过后迅速恢复以及在冰融化之后有效（重新）定潮间栖息地的能力。沉积在上岸的大型藻类残骸相关的大戟和山hy的平均浓度高达每克底物52×10〜3个人。据推测，线虫可以在北极潮间带的残骸分解中发挥重要作用。

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