Identification of refereNce-Status for Irish lake typoloGies using palaeolimnological metHods and Techniques (IN-SIGHT)

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Resource or Project Abstract

The Oona Water is a eutrophic river in Co. Tyrone. The gleyed, drumlin soils of low impermeability and soil P concentrations exceeding soil P index 2 provide the source and transport factors necessary for P transfer to the river system. The monitored catchments of 0.15km2, 0.62km2 and 88km2 were 100%, 100% and 95% grassland, respectively and TP exports of 2.4, 2.4 and 3.1kg/ha were measured during 2002. This was a wet year and typical hydrological year exports are likely to be less than this ( kg/ha during the 01/10/2001 to 30/09/2002 hydrological year). As water transfer is extremely efficient owing to good hydrological connectivity in this catchment, controlling the source, i.e. soil P (soil P reserves or inappropriate seasonal fertilising) is recommended as being the primary management recommendation in catchments of similar landuse and permeability. · Particulate P was the largest P fraction and this was associated with suspended sediment concentrations that were also mobilised during storm events.· Dilution of P load was not observed at the larger catchment scale and this was due to high P concentrations (up to 0.26mg TP/L) measured between storms during periods of lower flow. These are mainly in the dissolved form and while a small part of the annual load from the rivers (e.g. to Lough Neagh), they are contributing to the eutrophication of the river systems by chronically enriching the frequent, low flows. The source of these low flow P loads is still speculative and an assessment tool is required to quantify the contributions at low flows (e.g. Nash and Halliwell, 2000; Baker, 2002) in much the same way as P loads to the major lakes in Ireland have been partitioned (McGarrigle et al., 2001; Foy et al., 2003). A working hypothesis on the source of these low flow P loads is from the septic tank effluent via the dense rural population (approximately 0.38/ha).· Despite 76 grab samples (at least 1/week) being taken during the 2002 calendar year at the larger catchment scale, less than 12% were coincidental with storm events. River water quality monitoring on a typically weekly or monthly basis is therefore inadequate and will not provide the necessary data for estimating annual water quality statistics (loads and averages), as these will be biased towards the lower percentile flows. A programme of automatic sampling for river water quality monitoring, especially on flashy rivers such as the Oona Water, is therefore recommended at all scales.

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Contact Information for This Resource

Dr Phil Jordan
University of Ulster
Research Scientist
School of Environmental Sciences, Cromore Road, Coleraine, Coleraine BT52 1SA, Northern Ireland
Telephone: +44 (0) 2870 324193

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Attachment Name and Download Link
Att 1    Oona_Water_Catchment.jpg   (0.08 Mb)
Att 2    Phytoplankton_35_CRLS.xls   (0.13 Mb)
Att 3    Oona_Analysis_Results.xls   (0.24 Mb)
Att 4    Dry_Weights_Data.xls   (0.18 Mb)
Att 5    Hydromet_Interpol.xls   (0.14 Mb)
Att 6    INSIGHT_Water_Quality.xls   (0.12 Mb)
Att 7    Oona_2002_chemistry_30mins.xls   (0.67 Mb)

Suggested Citation Information

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Author(s)Jordan, P.
Title Of WebsiteSecure Archive For Environmental Research Data
Publication InformationIdentification of refereNce-Status for Irish lake typoloGies using palaeolimnological metHods and Techniques (IN-SIGHT)
Name of OrganisationEnvironmental Protection Agency Ireland
Electronic Address or URL
Unique Identifier50bc15f4-42ef-102a-b1da-b128b41032cc
Date of AccessLast Updated on SAFER: 2017-07-28

An example of this citation in proper usage:

Jordan, P.   "Identification of refereNce-Status for Irish lake typoloGies using palaeolimnological metHods and Techniques (IN-SIGHT)". Associated datasets and digitial information objects connected to this resource are available at: Secure Archive For Environmental Research Data (SAFER) managed by Environmental Protection Agency Ireland (Last Accessed: 2017-07-28)


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Access Information For This Resource

SAFER-Data Display URL
Resource KeywordsIN-SIGHT, Reference Status
EPA/ERTDI/STRIVE Project Code2002-W-LS/7
EPA/ERTDI/STRIVE Project ThemeWater Quality
Resource Availability: Any User Can Download Files From This Resource
Limitations on the use of this ResourceUsage of the data is available to all users. By downloading and using the data you are accepting the data disclaimer for the data. Please familiarise yourself with this document below. In any publication outputs please cite the original producers and owners of this data correctly using the suggested citation information.

Please Note: Given that this metadata documents one workpackage in the INSIGHT project you may be required to cite other project partners when using other data in this project.
Number of Attached Files (Publicly and Openly Available for Download): 7
Project Start Date Friday 1st February 2002 (01-02-2002)
Earliest Recorded Date within any attached datasets or digital objects Monday 4th March 2002 (04-03-2002)
Most Recent Recorded Date within any attached datasets or digital objects Tuesday 31st May 2005 (31-05-2005)
Published on SAFERMonday 23rd April 2007 (23-04-2007)
Date of Last EditWednesday 25th April 2007 at 11:33:59 (25-04-2007)
Datasets or Files Updated On Tuesday 24th April 2007 at 10:21:50 (24-04-2007)

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Geographical and Spatial Information Related To This Resource

Description of Geographical Characteristics of This Project or Dataset
The Oona catchment (96 km2) is an international RBD shared between the Republic and Northern Ireland. It is located in County Tyrone and forms a small part of the catchment of the River Blackwater, one of the six major influent rivers of Lough Neagh in Northern Ireland. Most of the Oona catchment is situated in the drumlin belt of Northern Ireland.

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Supplementary Information About This Resource

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Lineage information about this project or dataset
Identification of reference status for Irish lake typologies using palaeolimnological methods and techniques (IN-SIGHT) (EPA/ERTDI project # 2002-W-LS/7) and Past, current and future interactions between pressures, chemical status and biological quality elements for lakes in two contrasting instrumented catchments in Ireland (ILLUMINATE) (EPA/ERDI project # 2005-W-MS-40-M1). IN-SIGHT was completed at the end of December 2005. ILLUMINATE started on June 1st 2006.

IN-SIGHT determined the current ecological status of a representative selection of Candidate Reference Lakes (CRLs) s in Ireland and established biological reference conditions for examples of the main types of impacted lakes in the country. I
Supplementary Information
Phytoplankton Survey Dataset (Dr. Sabri Kilic)

This dataset is a contemporary synoptic survey of phytoplankton species and dominance in the 35 CRLs from mid-lake surface water samples taken concurrently with sediment cores in 2003. Laboratory analysis was undertaken by Dr Sabri Kilinc.Phytoplankton Sampling MethodPhytoplankton samples were collected from the surface layer of each lake using 30ml universal tubes. The sample tubes were used rather than phytoplankton net hauls for time efficiency and to allow the collection of all plankton sizes, including nanoplankton. The sample tubes were dipped under the surface and the 30ml of sample was immediately preserved using 6 drops of Lugols iodine solution. This gave a sample preservation concentration of 1:100 (Lugols to sample).Phytoplankton Cell CountsIdentification of the phytoplankton and counting of cells was carried out using a Nikon Eclipse TE2000-U inverted microscope, at a magnification of x400 (x40 objective and x10 eye-piece). The sample was allowed to settle for 24 hours in a Hydro-Bios 10ml tubular plankton chamber before counting. Phytoplankton was identified to major algal group level.Worksheets'Meta data' sheet shows the months in which lakes were sampled during each field campaign.'Phyto counts' sheet shows the transect counts.'Phyto per ml' sheet indicates the concentration of each group.'General condition' is an indication of the type of trophic status in which the species would flourish.The lake worksheets indicate the species recorded and, in red, is an indication of the predominant species and a tentative ecological interpretation based on trophic requirements.As this dataset represents a single sample summer survey, it should be treated in that context and not indicative of general, or annual, conditions/communities.

This dataset is a contemporary synoptic survey of the water quality conditions in the 35 CRLs, at the mid-lake sample sites, taken concurrently with sediment cores in 2003. Data collection in the field and subsequent laboratory analysis was carried out by Richard McFaul.ProfilingThe water quality profiles were measured using a YSI (Yellow Springs Instruments) 556 MPS (Multi- Probe System) Sonde. Fitted with four probes, the sonde measured, in situ, temperature, dissolved oxyegn, conductivity, resistivity, total dissolved solids and pH. Readings were made at the surface and at 1m intervals down the water column. Secchi depthThe Secchi depth was measured using a standard 20cm diameter black and white disc.Total PhosphorusTP was determined using the phosphomolybdate method, as per Murphy & Riley (1962) and Eisenreich, et al (1975). After autoclave digestion using sulphuric acid and potassium persulphate, acidic molybdate was added to form a compound which was reduced by ascorbic acid. The concentration of this compound (phosphomolybdate) was measured spectrometrically at 882 nm.Chlorophyll aChlorophyll a concentration was determined spectrometrically at 665nm, following cold extraction of the pigment using 90 % V/V methanol for 8 hours at room temperature (Marker, et al 1980).Worksheets'Meta data' sheet shows the months in which lakes were sampled during each field campaign.'Surface data' sheet gives a summary of water quality data collected from the surface of each lake.The lake worksheets detail the water quality profiles of each lake. Data from some of the lakes sampled in the July campaign are missing due to equipment failure in the field.AbbreviationsTP Total Phosphorus (mg l-1) TDS Total Dissolved Solids (g l-1)Temp Temperature (degC) pH pHDO Dissolved oxygen (% saturation) Sec Secchi (cm)Cond Conductivity (micro S cm-1) Chl a Chlorophyll a (micro g l-1)Res Resistivity (Mohms cm-1)

SEDIMENTS DRY Weight Dataset (Richard McFaul):
This dataset provides sedimentary dry weight profiles, expressed as a percentage, from sediments of 36 candidate reference lakes. The dataset also contains indicative sediment depth, wet and dry weights. All sampled wet sediments were weighed, dried at 105degC for 24 hours, cooled in a dessicator and reweighed. Cores were taken using a 50cm Renberg corer between June 2003 and September 2003.

Irvine, K., Allott, N., De Eyto, E., Free, G., White, J., Caroni, R., Kennelly, C., Keaney, J., Lennon, C., Kemp, A., Barry, E., Day, S., Mills, P., O? Riain, G., Quirke, B., Twomey, H., Sweeney, P. (2001). The Ecological Assessment of Irish Lakes: the development of a new methodology suited to the needs of the EU Directive for surface waters. Environmental Protection Agency, Wexford.

Jennings, E., P. Mills, P. Jordan, J-P. Jensen, M. Søndergaard, A. Barr, G. Glasgow and K. Irvine (2003) Eutrophication from agricultural sources Seasonal patterns and effects of phosphorous. Final Research Report (2000-LS-2.1.7-M2). EPA, Wexford.

Jordan, P., Menary, W., Daly, K., Kiely, G., Morgan, G., Byrne, P. and Moles, R. (2005) Patterns and processes of phosphorus transfer from Irish grassland soils to rivers - integration of laboratory and catchment studies. Journal of Hydrology, 304: 20-34.
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