Pearl Mussel Distribution for Habitats Directive (Council Directive 92/43/EEC) Reporting under Article 17.
This dataset comprises of a collation of records of pearl mussels from Welsh rivers.
This dataset is a compilation of numerous records from different sources complied for Habitats Directive Article 17 reporting, related to freshwater pearl mussels Margaritifera margaritifera. Every six years, Member States of the European Union are required (by Article 17 of the Directive) to report on implementation of the Habitats Directive. The reporting format set by the European Commission requires a separate analysis for each species and each habitat in each biogeographic region which that country covers. This dataset comprises of Environment Agency and Countryside Council for Wales surveys.
The majority of records in this dataset are collated with six or eight figure grid-references, although where surveys have reported on individual river sections then four-figure references may have been used. The dataset represents the distribution of the pearl mussel across Wales during this period
The aim of this collation has been to ensure that the 10 km distribution maps on the NBN accurately reflect the known position of this species. Records have been compiled with this in mind and hence no attempt has been made to collate every single record for each 10km square within the designated time period.
Most have an exact date but some are in the following format MM-YYYY or YYYY only.
No citation information available.
Looking up... the number of records that can be accessed through the NBN Atlas. This resource was last checked for updated data on 08 May 2018. The most recent data was published on 08 May 2018.Click to view records for the Pearl Mussel Distribution for Habitats Directive (Council Directive 92/43/EEC) Reporting under Article 17. resource.
Metadata last updated on 2018-05-08 12:14:03.0