Freshwater Diatoms in Ireland

Niels Foged 1977 - Bibliotheca Phycologica Band 34

The indispensable guide to freshwater diatoms in Ireland. The author collected 263 samples from 143 localities in 1953  from which he identified 765 taxa. The book contains 757 photographs of 460 different taxa in 48 plates. Koeltz Books frequently hold a copy and provide an excellent service. 

The diatoms: biology, and morphology of the genera.

Round, F., R. M. Crawford, and D. G. Mann. 1990.  The diatom volume from the standpoint of a thorough review of the genera. Recently reprinted in affordable paperback. Many electron micrographs. Cambridge University Press.


A Comparative Limnological Survey of Rathlin Island, Co. Antrim, with Particular Reference to Diatoms
R. J. Flower
Proceedings of the Royal Irish Academy.Vol. 82B (1982), pp. 1-20
A Comparative Limnological Survey of Rat
Adobe Acrobat Document 1.6 MB
A Comparative Survey of the Epipelic Diatom Flora of Some Irish Loughs
F. E. Round
Proceedings of the Royal Irish Academy. Vol. 60 (1959/1960), pp. 193-215
A comparative survey of the epipelic dia
Adobe Acrobat Document 2.1 MB
Irish River Epilithics.pdf
Adobe Acrobat Document 131.9 KB


Benthic diatom samples were collected from 45 potential reference river sites in Ireland.
Diatom samples were also collected from 24 lowland eutrophic sites. The main objective for
sampling the potential reference sites was to determine the type-specific biological typologies
represented by these sites. The lowland sites were sampled as part of another project and are used here for comparative purposes. A larger number of taxa was identified from the reference sites (175 species) in comparison with the lowland sites. (71 species). Distinct differences in diatom distribution and diversity between the reference sites and the lowland sites were revealed by DCA analysis.


Compiled by Richard T. Carter


An excellent listing of some of the fossil species from Toomebridge on a selection of slides together with an indication of their relative abundance.



Diatom Analyses of Sediments from Lough Ine, Co. Cork, Southwest Ireland

Jenny S. Buzer

New Phytologist, Vol. 89, No. 3. (Nov., 1981), pp. 511-533


This paper describes the diatom analyses of a sediment core from the Marine Lough Ine which is situated in County Cork on the South West coast of Ireland. This is a tidal lough linked to the sea via a narrow channel containing a remarkable tidal race and is Europe's largest seawater lake. It was a freshwater lake until geological forces carved out the narrow channel that links it to the sea. The channel is so narrow that the tidal flow is so impeded that high tide in the lough differs from high tide in the sea by several hours.


The diatoms found in the core are listed under the Lough Ine tag in the Mapping section and contain a mixture of freshwater and marine forms. The lough was dominated by Cyclotella

when the lough was freshwater and very productive supporting an alkaliphilic, planktonic flora progressing through Fragilaria as dominant during transition to marine when Paralia sulcata and other benthics predominate. (Above extract partially drawn from paper).



Three cores from two connected lakes in Central Ireland (Lough Kinale and Derragh Lough) were investigated using diatom analysis to establish the Holocene development of the lacustrine system, any local variations within the lakes and any anthropogenic influences. The study area was situated in a lowland location and the lakes were shallow, unstratified and interconnected. Litho-and bio-stratigraphical analyses of the lake cores and deposits beneath a mire separating the two lakes showed the changing spatial configuration of the lake system in the early Holocene and the separation of the initial lake into three basins (cf. lacustrine cells) and finally into two interlinked lakes.



A 72-lake diatom training set was developed for the Irish Ecoregion to examine the response of surface sediment diatom assemblages to measured environmental variables. A variety of multivariate data analyses was used to investigate environmental and biological data structure and their inter-relationships. Of the variables used in determining a typology for lakes in the Irish Ecoregion, alkalinity was the only one found to have a significant effect on diatom assemblages. A total of 602 diatom taxa were identified, with 233 recorded at three or more sites with abundances ≥1%



...the typical vegetation changes that occur in sediments throughout Ireland during this period. The diatom record begins by being dominated by circumneutral and acidophilous...


...Augher, Co. Tyrone, N. Ireland, with water depths ranging from 3–12 m, were independently correlated using various parameters: diatom biostratigraphy, magnetic mineral stratigraphy...


Spatial variability of sediment and diatom deposition was assessed in a small monomictic, eutrophic lake in Northern Ireland (Lough Augher, Co. Tyrone) using measurements... western Ireland. Cell counts indicated low phytoplankton productivity and this was reflected in low chlorophyll a values and high Secchi readings. Diatoms predominated in...



Diatom analyses were undertaken of sediment cores covering a range of water depths in a small eutrophic lake (Lough Augher, Co. Tyrone, N. Ireland...


...changes in epilimnetic P-concentrations. A diatom-phosphorus calibration data set for 43 eutrophic lakes in Northern Ireland has been constructed and applied to...

 the May samples, but in June large and chain-forming centric diatoms constituted a significant proportion of the phytoplankton community. We conclude that the...



The diatom Cymbellonitzschia diluviana Hustedt is an important indicator species in interglacial deposits but is rarely reported from contemporary sites. The presence of large populations in Lough Neagh, N. Ireland, made possible a study of its ecology and auxosporulation.



Patterns in freshwater diatom taxonomic distinctness along an eutrophication gradient


* Faculty of Sciences, University of A Coruña, Coruña, Spain
† Department of Biology, McGill University, Montreal, QC, Canada
‡ Department of Geography, University of Limerick, Limerick, Ireland
§ School of Natural Sciences, Trinity College, University of Dublin, Dublin, Ireland

A variety of species richness measures have been used to assess the effects of environmental degradation on biodiversity. Such measures can be highly influenced by sample size, sampling effort, habitat type or complexity, however, and typically do not show monotonic responses to human impact. In addition to being independent of the degree of sampling effort involved in data acquisition, effective measures of biodiversity should reflect the degree of taxonomical relatedness among species within ecological assemblages and provide a basis for understanding observed diversity for a particular habitat type. Taxonomic diversity or distinctness indices emphasize the average taxonomic relatedness (i.e. degree of taxonomical closeness) between species in a community.