THE ECOLOGY OF THE ATTACHED DIATOMS AND OTHER ALGAE IN A SMALL STONY STREAM
THE ECOLOGY OF THE ATTACHED DIATOMS AND OTHER ALGAE IN A SMALL STONY STREAM
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DOI：
10.2307/2257397
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发表时间：
1958-01-01
影响因子：
5.5
通讯作者：
DOUGLAS, B
中科院分区：
文献类型：
--
作者：
DOUGLAS, B
描述了估计在石头、岩石和苔藓植物上附着的藻类(特别是硅藻)随机分布的种群的方法。描述了4年以上的定期采样和环境因素。天牛的分布和周期性。文中给出了详细的分类群，并对其他种进行了讨论。水流条件是最重要的；高水位减少了石头上的阿克纳特种群，在一定程度上减少了岩石上的种群；低水位一开始促进了种群的增加，但最终是不利的；附生种群的变化小于附生植物。毛竹幼虫种群与其种群数量呈负相关，提示存在放牧效应。河流中的总体分布受到细胞被冲刷的影响，随后它们的沉积向下移动。基质上的泥炭沉积阻止了1伸展的生长。
Methods are described for estimating randomly distributed populations of attached algae (particularly diatoms) on stones, rock, and bryophytes. Periodic sampling over 4 years, and environmental factors, are described. The distribution and periodicity of the Achnanthes sp. group is given in detail; other species are also considered. Flow conditions are most important; high water levels reduce Achnanthes populations on the stones, and to a less extent on the rock; low water levels at first encourage population increases, but ultimately are adverse; epiphytic populations vary less than epilithic. A negative correlation, suggesting a grazing effect, was found with populations of the caddis larva Agapetus fuscipes. The overall distribution in the stream is affected by the washing-off of cells, and their subsequent deposition lower down. Growth in 1 stretch was prevented by a peaty deposit on the substratum.