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The Epipelic Algal Flora of the River Wye System, Wales, U. K. 2. Algal Phyla and Species Population Dynamics
Author(s) -
Antoine Samir E.,
BensonEvans Kathryn
Publication year - 1986
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19860710608
Subject(s) - phylum , ecology , flora (microbiology) , chlorophyta , algae , colonisation , biology , cyanobacteria , weir , population , botany , geography , colonization , paleontology , demography , cartography , sociology , bacteria
The Bacillariophyta dominated over the other phyla and were mainly recorded in high densities during summer and autumn. The Chlorophyta and Myxophyta (Cyanobacteria) were represented by coccoid forms and by non‐heterocystous, filamentous forms, respectively. Both were mainly recorded during summer and mostly absent during winter. Other phyla were occasionally recorded in low densities; the Chrysophyta being found in the River Elan and at one site on the River Wye during June 1980. Their members were considered as “contaminants” or “fall‐out” from other communities. Pennate diatoms were the most “constant” species and either showed a general upstream or downstream increase or a general distribution throughout the study area. Populations of the same species colonising both sediments and stones were not correlated or insignificantly correlated with each other at most stations. It was concluded that sediments were unsuitable for algal colonisation. The River Elan and upper Wye were rated as oligosaprobic, the River Ithon and lower Wye as β‐mesosaprobic and the River Lugg as α‐mesosaprobic.