Riverfly Census - Aquatic invertebrate species occurrence, for the calculation of pressure biometric scores in English and Welsh rivers covering the period 2015 - 2018
Aquatic invertebrate species and abundances were obtained from 3 minute kick-sweep sampling to Environment Agency guidelines. In total 20 rivers were surveyed, typically for three years. Approximately five sample sites were chosen for each river and these were consistently used throughout the survey. Samples were preserved in Industrial Denatured Alcohol and identified by a professional entomologist in a laboratory. The species present were plugged into a biometric calculator to produce scores against various stress types, including sediment, phosphorus, flow, chemicals and organic pollution.
Additional information about the dataset can be found on www.salmon-trout.org/riverfly-census, along with the reporting generated on the back of the dataset. Alternatively for more specific data related questions email Lauren (email@example.com).
20 rivers, 3 in Wales and 17 in England
Without a strong data baseline it is extremely difficult to pinpoint exact pressures or confidently measure improvement in our waters. We frequently hear from our members about missing flylife and lack of fish compared to the 'good old days', but anecdotal evidence like this has little weight in environmental decision making. Additionally, the water quality pressures threatening young salmon & trout are less obvious, and often invisible. We have used invertebrate species to generate a national baseline of river health, using them as a diagnostic test to calculate pressure scores for various river stress types.
3 minute kick sweep sampling, to Environment Agency guidelines.
Salmon & Trout Conservation. (2019). Riverfly Census [Dataset]
Looking up... the number of records that can be accessed through the NBN Atlas. This resource was last checked for updated data on 03 Dec 2019. The most recent data was published on 03 Dec 2019.Click to view records for the Riverfly Census - Aquatic invertebrate species occurrence, for the calculation of pressure biometric scores in English and Welsh rivers covering the period 2015 - 2018 resource.