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首页> 外文期刊>Harmful Algae >A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature
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A 100-year record of changing Pseudo-nitzschia species in a sill-fjord in Denmark related to nitrogen loading and temperature

机译：与氮负荷和温度有关的丹麦基尔峡湾中伪装尼兹菌物种变化的100年记录

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摘要

We present a detailed record of shifts in species composition of the toxic diatom genus Pseudo-nitzschia from 1905 to 2001 in Manager Fjord, Denmark, most probably driven by changes in nitrogen loading to the coastal environment and increasing temperatures in the sea. The fertile Manager Fjord is a long narrow sill-fjord with a permanently anoxic basin. The fjord has experienced increased nutrient loading during the last 100 years and is presently highly eutrophic. ~(210)Pb-dated sediment cores from the anoxic basin in Manager Fjord were used in a palaeoecological study to explore changes in species composition. Within the genus Pseudo-nitzschia we observed a change in species composition where Pseudo-nitzschia multiseries was dominant before 1947, when a shift occurred towards dominance by Pseudo-nitzschia pungens. At the same time an increasing relative abundance of Pseudo-nitzschia seriata and Pseudo-nitzschia americana was observed. The increase in relative abundance of P. pungens was positively correlated to nitrogen loading and suggests that increased nitrogen loading during the last 100 years contributes to the observed shift. We hypothesise that increased water temperature in the area could also have contributed to the observed shift in species composition. Three of the species identified (P. heimii, P. americana, P. pseudodelicatissima) are new records for Denmark and Scandinavia. One of these species, P. americana, has been linked to increased ammonium concentrations. The preservation of the frustules was excellent and valves of Pseudo-nitzschia were identified to species level in sediment dating as far back as 7900 years before present.
机译：我们提供了1905年至2001年在丹麦峡湾的有毒硅藻属伪尼茨菌属的物种组成变化的详细记录，这很可能是由向沿海环境的氮负荷变化和海洋温度升高引起的。肥沃的Manager Fjord峡是一条细长的基尔峡湾，带有永久缺氧的盆地。在过去的100年中，峡湾的营养物质增加，并且目前富营养化。来自峡湾经理缺氧盆地的〜（210）含铅沉积物岩心被用于古生态研究，以探索物种组成的变化。在伪奈瑟菌属中，我们观察到物种组成发生了变化，其中伪奈瑟菌多系列在1947年之前占主导地位，当时，伪奈瑟氏菌向着优势地位转移。同时，观察到假单胞菌和美洲假单胞菌的相对丰度增加。刺梨假单胞菌相对丰度的增加与氮负荷呈正相关，并表明在最近100年中氮负荷的增加有助于观察到的变化。我们假设该地区的水温升高也可能导致了所观察到的物种组成的变化。确定的三个物种（P. heimii，P。americana，P。pseudodelicatissima）是丹麦和斯堪的那维亚的新记录。这些物种之一，美洲假单胞菌，与铵浓度升高有关。 rust壳的保藏性极好，伪造的尼兹菌的瓣膜在沉积物中的物种水平上可追溯到7900年前。

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  • 来源
    《Harmful Algae》 |2010年第5期|P.449-457|共9页
  • 作者

    N. Lundholm; A. Clarke; M. Ellegaard;

  • 作者单位

    Aquatic Microbiology Group, Department of Biology, University of Copenhagen, Oster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark;

    APEM Ltd, Riverview, A17 Embankment Business Park, Heaton Mersey, Stockport SK4 3GN, United Kingdom;

    rnAquatic Microbiology Group, Department of Biology, University of Copenhagen, Oster Farimagsgade 2D, DK-1353 Copenhagen K, Denmark;

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  • 正文语种 eng
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  • 关键词

    nitrogen; palaeoecology; pseudo-nitzschia; temperature; toxic algae; urea;

    机译：氮;古生态学假性痴呆温度;有毒藻类尿素;

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