The distribution of tube-dwelling diatom species in the Severn Estuary
The distribution of tube-dwelling diatom species in the Severn Estuary
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DOI：
10.1017/s0025315400021196
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发表时间：
1977-02
影响因子：
1.2
通讯作者：
E. Cox
中科院分区：
文献类型：
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作者：
E. Cox
管状硅藻存在于各种生境中，从海洋到淡水，分布在不同类型的底物上；岩石、木材、植物和动物。我曾将物种描述为管居物种(COX，1975 b)，如果它们产生粘液，粘液被凝结成细胞周围的管状结构，但在粘液管中，个别细胞移动和分裂。管子通常在底部附着在底物上，并通过封闭的硅藻分泌更多的粘液而在顶部延伸。因此，管子体积增加，以适应增加的管内硅藻种群。一些工作者已经记录了在岩石海岸上管状硅藻的存在(Aleem，1949,1950；Castenholz，1963,1967；Hopkins，1964)，而Castenholz(1963,1967)则将一些沿海物种的季节和分布模式与它们对光照强度和日长的反应联系起来。卡特(1932,1933)描述了两个盐沼的藻类植物区系，包括几个管居物种，但对河口出现的管居硅藻的研究很少。在对这些硅藻的生物学研究过程中(COX，1975 ft)，它们在塞文河口两个地点的分布的变化促使人们对它们在整个河口的分布进行了调查。硅藻的分布是根据河口的地理位置和河口下游两个地点(Clevedon和Weston-Super-Mare)的岸上位置记录的。
Tube-dwelling diatoms are found in a variety of habitats, from marine to fresh water on different types of substrata; rock, wood, plant and animal. I have described species as tube-dwelling (Cox, 1975 b) if they produce mucilage which is consolidated into a tubular structure around the cells, yet within the mucilage tube individual cells move and divide. The tube is usually attached to the substratum at its base and is extended apically by the secretion of more mucilage by the enclosed diatoms. Tube volume thus increases to accommodate the increased endotubular diatom population. The presence of tube-dwelling diatoms on rocky shores has been recorded by some workers (Aleem, 1949, 1950; Castenholz, 1963, 1967; Hopkins, 1964), while Castenholz (1963, 1967) correlated seasonal and distribution patterns of some littoral species with their response to light intensity and day-length. Carter (1932,1933) described the algal flora, including several tube-dwelling species, of two salt marshes but little work has been done on tube-dwelling diatoms occurring in estuaries. During the course of a study on the biology of these diatoms (Cox, 1975 ft) variation in their distribution at two Severn Estuary sites prompted an investigation into their distribution in the estuary as a whole. Diatom distribution was recorded with reference to the geographical location in the estuary and to the position on the shore at two sites lower down the estuary (Clevedon and Weston-Super-Mare).