Native Species Surveys Across Wales (1978 to 2006)
The data comprises primarily of the Welsh abstract of freshwater invertebrates. It comes from BIOSYS, the national ecology database for freshwater species and is related to the aquatic stages of the invertebrates. Most data have been collected from main rivers as part of an extensive routine monitoring network. The data are restricted to a selection of families which contain one species only. The records cover the whole of Wales. Sites are recorded at a minimum precision of 100 m. The distribution of records is biased towards main rivers and areas with historical water quality issues. This is especially true of older records. The sampling methodologies and taxa identified are the same at all sites. Formally known as: Species Surveys Native Species AfA227.
The purpose of this data capture was to primarily monitor the distribution of freshwater invertebrates.
The identification of these species has been subject to formal quality control since 1990 and should, therefore, be of a high standard. Due to the nature of the species in this dataset (single species families), it is likely that most records, including those earlier than 1990 are of a good quality.
This data was collected by ecologists. Most of the data originate from kick samples taken in main rivers and have been collected and analysed using standard sampling methodologies. The data was extracted for Wales from the Environment Agency's national ecology database (BIOSYS) and does not include older records held in paper copy only. Records for families, genera and species from chosen single species families have been extracted and are reported at the species level.
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Looking up... the number of records that can be accessed through the NBN Atlas.Click to view records for the Native Species Surveys Across Wales (1978 to 2006) resource.
Metadata last updated on 2017-11-10 12:37:25.0