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首页> 外文期刊>Helgoland marine research >Mudflat biota since the 1930s: change beyond return?
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Mudflat biota since the 1930s: change beyond return?

机译：自1930年代以来的泥滩生物群系：改变无以复加？

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Where, since the 1980s, patchy and variable green algal mats are prevailing, distinct belts of an amphi-pod (Corophium volutator) and seagrass (Zostera spp.) had dominated in the 1930s. The zonation between tide marks has been mapped in a sheltered sedimentary bay in the Wadden Sea near the island of Sylt (coastal eastern North Sea). Maps on vegetation from 1924 and on selected mac-robenthos from 1932 and 1934 are compared with biannual surveys conducted from 1988 to 2006. Rising high water levels and eutrophication are suggested to be major causes of the observed long-term changes. In front of a saltmarsh, a sandy beach developed and partly displaced former cyanobacterial mats. Advancing sandiness may have inhibited C. volutator and facilitated lugworms, Arenicola marina, in the upper tidal zone. A variable occurrence of green algal mats arising in the 1980s affected infauna and seagrass by smothering the biota underneath. This dissolved a coherent belt of Zostera noltii. In the lower tidal zone, natural disturbances had lasting effects on the occurrence of mussels with attached fucoid algae. The spectrum of species became enriched by alien species (13% of mac-robenthic taxa). A reversal to habitat structure and biotic zonation of the 1920-1930s does not seem possible. Aliens, in combination with climate change, are expected to further divert the ecological pattern to new configurations.
机译：自1980年代以来，斑驳且多变的绿色藻类垫层盛行，在1930年代，两栖荚（Corophium v​​olutator）和海草（Zostera spp。）的不同带占主导地位。潮汐标记之间的分区已绘制在叙尔特岛（北沿海东部）附近的瓦登海一个避风塘中。将1924年以来的植被图以及1932年和1934年的某些Mac-robenthos图与1988年至2006年进行的半年一次调查进行了比较。高水位上升和富营养化被认为是观测到的长期变化的主要原因。在盐沼前，一个沙滩发达，部分地取代了以前的蓝藻垫。不断上升的沙质可能抑制了潮间带上的C. volutator，并促进了蠕虫Arenicola marina。 1980年代出现的各种绿色藻类席位会窒息下面的生物群，从而影响动物疫情和海草。这溶解了结缕草的连贯带。在低潮区，自然干扰对附有岩藻糖藻类的贻贝的发生具有持久影响。外来物种丰富了物种的谱图（占Mac-robenthic分类群的13％）。似乎不可能逆转1920-1930年代的栖息地结构和生物区带。结合气候变化，外星人有望进一步将生态格局转移到新的形态。

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