Vertical Heterogeneity in the Water Column of Abbot's Pond: II. The Influence of Physical and Chemical Conditions on the Spatial and Temporal Distribution of the Phytoplankton and of a Community of Epipelic Algae

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Abstract
The phytoplankton community in Abbot's pond is fitted for existence in the short, relatively stable water column. Non-motile species form predominant populations only when the water column is relatively turbulent. Motile species persist in the water especially when the water column is stratified, and form the largest standing crops of all the species found. A very marked vertical stratification of phytoplankton species was noted during thermally stratified conditions, and the positions of various species is related to physical and chemical conditions in the water column and in some cases to motility. An epipelic algal community, having characteristics similar to those of `pollution' communities, was found on partly deoxygenated sediment surfaces under certain conditions. The effects of shelter on the limnology and algal biology of Abbot's pond are discussed, and the possible future development of the pond is outlined.

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