An inter-disciplinary investigation of biological, physical and geochemical lake processes

Chemical Folder - all units are micrograms per litre Physical folder - all units specified on the sheets. Biological Folder - Chl a is in micrograms per litre. Some microscopy samples were counted by Johanna Laybourn-Parry and so there are no data available for sizing or for heterotropic bacteria rods v cocci.

These are mainly in Nov 99 and indicated on the sheet as 'JLP' and nd. CL does not contain cyanobacteria, so there are no entries for CL in the cyano workbook. PNAN and HNAN, ciliates and rotifers were sized once in Nov 99 to give a carbon pool snapshot.

PNAN and HNAN sizing data are in the PNAN and HNAN workbook, ciliate and rotifer abndance and sizing is in the carbon pool workbook. Total biomass data are also in the carbon pool workbook. Production Folder - Bacterial production (ng C l-1h-1) raw data are given, calculations are to the left of the raw data and graphs at the bottom of the data.

Fractionation and Nutrient addition workbooks relate to work done separating the bacterial fraction into free and aggregate associated bacterial fractions and to spiking with nutrients and measuring production. Graphs Many of the graphs do not have labelled X axes (as decimal dating was used throughout) but dates are given with the data. Sampling Sites LD1 and LD3 were shallow sites, so samples were originally taken from 3 depths but this was reduced in June/July to two depths.

Sites CL and LD2 are deep sites and samples were originally taken from 0, 2, 4, 6, 8, 10, 15, 20, 30, 40 m but this was reduced in Mar/May to 0, 2, 5, 8, 10, 15, 20 and 40m. Several sampling sites for LD1 and LD3 were tried at the start of the programme (denoted as 'old' or 1x 1a sites on the spreadsheets). In January 00 only one sample from LD1 and LD3 was collected.

Sampling Dates Sampling dates vary between the sites, but are given with each data set. There may appear to be discrepancies for example, LDS ammonia sampled on 21 Jan but DOC on 25 Jan - but sampling was broken down at the start while I learnt the technique The fields in this dataset are: Ammonia concentration Heterotrophic bacteria Cyanobacteria abundance Ciliates Rotifers nitrite nitrate temperature oxygen (O) cysts biomass volume PH conductivity light data phosphorus concentrations saturation conditions air temperature ice thickness factionation chlorophyll a isoclines standard deviation mean conversion factor carbon produced