A Study of the Benthic Diatoms of Loch Sween (Argyll)

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Abstract
Pennate diatoms of this arm of the sea were collected by exposing glass slides for colonization on the mud surface at depths of 1 - 20 m, and also by core-sampling. The more abundant species are listed and data given of habitat distribution and seasonal variation. A few samples from depths down to 110 m revealed some active diatoms, suggesting that they have a lower compensation point than planktonic forms. There is also evidence that the natural phosphate concentration may not be a limiting factor to the extent that it is for the phytoplankton. The value of the above methods of collection is discussed and it is concluded that a reliable method for quantitative studies is still to be found. The population of bottom diatoms is shown, however, to be large, and on occasion forms an important part of the food of benthic animals. This combined with the evident extent and stability of the population suggests that in future evaluations of productivity in coastal waters the unit column of water under 1 sq. m. should extend to and include the mud surface.