Dataset Descriptions

	European Diatom Database
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Dataset information

UK meres TP dataset

EDDI dataset code	SCM
Dataset type	TP
Number of samples	33
Collection date	1993
Contributor	Helen Bennion
Contact	Helen Bennion

This dataset includes 33 lakes from the Cheshire and Shropshire meres region of the English Midlands. They are all relatively small, shallow, lowland waterbodies. All lakes are alkaline and nutrient-rich with base-rich geology. Surface sediment samples were collected during February 1993 by University College London and diatoms were counted by Helen Bennion. These sites form part of a larger diatom-total phosphorus training set of 152 NW European lakes (Bennion et al., 1996) and have also been used to develop a chironomid-total phosphorus inference model (Brooks et al., 2001). Palaeolimnological studies have been undertaken at a number of these sites (e.g. Bennion et al., 1997, Brooks et al., 2001).

Full taxon list for this dataset.

Full sample list for this dataset.

Plot a map of this dataset.

Summary of environmental data for this dataset:

Variable	Units	N	Min	Max	Mean
Alkalinity	畫q/l	33	450	4280	2541
Calcium	畫q/l	33	391	4840	2858
Chloraphyll-a	痢/l	18	8.4	62.9	23.8
Chloride	畫q/l	33	450	1838	1077
Conductivity	猶/cm	33	118	724	461
Magnesium	畫q/l	33	135	2340	1079
Maximum depth of lake	m	33	0.9	29.5	7.08
Nitrate	痢/l	33	30	7620	1768
pH	pH units	33	7.09	8.21	7.7
Potassium	畫q/l	33	41.5	496	163
Secchi depth	m	33	0.4	3.1	1.22
Silica	mg/l	33	0.25	8.31	3.66
Sodium	畫q/l	33	312	1389	738
Soluable reactive phosphorus	痢/l	33	4.73	907	141
Sulphate	畫q/l	33	114	3119	1164
Total phosphorus	痢/l	33	72.9	1169	289
Water depth of diatom sample	m	33	0.9	29.5	7.08

Publications for this dataset:

Bennion, H., Juggins, S. & Anderson, N. J. (1996a) Predicting epilimnetic phosphorus concentrations using an improved diatom-based transfer function and its application to lake eutrophication management. Environmental Science and Technology, 30, 2004-2007.

Bennion, H., Monteith, D.T. & Appleby, P.G. (1997c) Nutrient reconstructions in standing waters. Final report to English Nature by ENSIS Ltd. Environmental Change Research Centre, Research Report No. 37, University College London.

Brooks S.J., Bennion, H. & Birks, H.J.B. (2001). Tracing lake trophic history with a chironomid-total phosphorus inference model. Freshwater Biology, 46, 513-533.