Primary production and distribution of phytopigments in the water column and sediments on the upwelling shelf off the Mauritanian coast (Northwest Africa)
Primary production and distribution of phytopigments in the water column and sediments on the upwelling shelf off the Mauritanian coast (Northwest Africa)
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毛里塔尼亚海岸（非洲西北部）上升流陆架的水柱和沉积物中植物色素的初级生产和分布
DOI：
10.1007/bf00006188
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发表时间：
1993
期刊：
影响因子：
2.6
通讯作者：
J. Hegeman
中科院分区：
文献类型：
--
作者：
E. M. Berghuis;G. Duineveld;J. Hegeman
1988年5月，对Banc d'Arguin外大陆架地区的水和沉积物进行了植物色素和有机碳的研究。浮游植物的初级生产也进行了测量，并估计使用停泊沉积物陷阱的有机物沉积。根据同时进行的水文测量，可以区分两种水。上升流水覆盖了南部陆架和北方陆架的外部。另一种水型具有较强的海岸性，主要分布在北方样带的近岸部分。叶绿素a和颗粒有机碳的分布与两种水型的分布基本一致。沉积物捕集器的色素的相似性分析表明，从两种水类型沉积的藻类材料的组成的差异。初级生产力也被发现是明显不同的，即在沿海水域类型较高。表层沉积物中的色素没有反映各自的上覆水类型，由于增加积累的色素在近海站的北方样带。这种积累似乎与近海方向的海底呼吸活动逐渐减少相对应。沿着南部样带，这种关系不能建立，即色素积累沿着货架边缘不明显。特别注意的是，在货架上存在特定的海草色素。没有发现海草物质大量涌入的证据。
In May 1988, water and sediments of the shelf area off the Banc d'Arguin were studied for plant pigments and organic carbon. Phytoplankton primary production was also measured and sedimentation of organic matter was estimated using moored sediment traps. On the basis of simultaneous hydrographic measurements, two water types could be distinguished. Upwelling water covered the southern shelf and the outer part of the northern shelf. The other water type had more coastal characteristics and covered the inshore part of the northern transect. The distribution of chlorophyll a and particulate organic carbon conformed with the distribution of the two water types. A similarity analysis of the pigments from the sediment traps showed a difference in the composition of the algal material depositing from the two water types. The primary production was also found to be distinctly different, i.e. higher in the coastal water type. The pigments in the surface sediments did not reflect the respective overlying water types due to the increasing accumulation of pigments at the offshore stations of the northern transect. This accumulation seems to correspond with the progressive reduction of the benthic respiratory activity in an offshore direction. Along the southern transect such a relation could not be established, i.e. pigment accumulation along the shelf edge was not apparent. Special attention was paid to the presence of specific seagrass pigments on the shelf. No evidence for a major influx of seagrass material was found.