Tir Cynnal and Tir Gofal Monitoring and Evaluation Programme: Marsh Fritillary Butterfly survey
Dataset records observations of species collected whilst undertaking field survey for Tir Cynnal and Tir Gofal Monitoring and Evaluation Programme: Marsh Fritillary Butterfly survey. Records have been aggregated to display the presence of observed species per 1km² as a single instance i.e. multiple instances of a species will only be represented once per 1km².
The dataset does not represent a national distribution and reflects a limited number of survey sites. More information can be found at: http://wales.gov.uk/topics/environmentcountryside/farmingandcountryside/farming/ schemes/glastir/tircynnal-tirgofal-monitoring-evaluation/?lang=en (EN), http://wales.gov.uk/topics/environmentcountryside/farmingandcountryside/farming/ schemes/glastir/tircynnal-tirgofal-monitoring-evaluation/?lang=cy (CYM).
Site selection was restricted to selected sample sites within six Watsonian vice-counties: Anglesey, Caernarvonshire, Denbighshire, Brecknockshire, Radnorshire and Glamorgan.
The objective was to determine if field-scale populations of marsh fritillary in agri-environment (AES) scheme farms differed from those in paired non-AES farms
Data recorded by specialists under contract to Welsh Government. Records present in this data have been checked against digital data supplied before submission to the NBN Gateway. Note that there is bias inherent to the data collection method where multiple sample sites within a km grid-square may have been surveyed. The effects of this situation have been mitigated, in part, by aggregating data to display only 1 instance of a species per km grid-square. Absence of species is not shown within the data. Data has also been checked by the NBN record cleaner.
Data reflects the quality of the records supplied by third parties in the fulfilment of "Tir Cynnal and Tir Gofal Monitoring and Evaluation Programme: Marsh Fritillary Butterfly survey".
Marsh fritillary populations were assessed using larval web surveys. These were conducted when the webs are most conspicuous, from late August until early October. Wherever possible larval web surveys were not undertaken during or shortly after heavy rain, as this can damage webs and make them less conspicuous.
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Looking up... the number of records that can be accessed through the NBN Atlas. This resource was last checked for updated data on 09 May 2018. The most recent data was published on 09 May 2018.Click to view records for the Tir Cynnal and Tir Gofal Monitoring and Evaluation Programme: Marsh Fritillary Butterfly survey resource.
Metadata last updated on 2018-05-09 06:52:09.0