As part of an evidence gathering exercise ahead of Abstraction Reform, the Environment Agency have recently contracted a consortium of consultants, led by CEH to carry out a systematic evidence review to collate and summarise investigations into the effect and impact of artificial alteration of flow on the ecology in British rivers.
To ensure that we are taking into account the most up to date evidence currently available, we are seeking any unpublished reports or studies that may have been undertaken that include an element of ecological appraisal / study of ecological data to determine the impact of artificial flow alteration on river ecology.
The alarm list contains species thought to pose a risk to surface waters and their ecological status under the EC Water Framework Directive, but whose presence has not yet been recorded in Great Britain.
The working paper outlining the impact classification of alien species has been updated (05/02/2014) following the completion of additional risk assessments by GBNNSS and Phase 3 of the review of Environmental Standards.
This classification method enables the assessment of invertebrates in rivers in relation to general degradation, including organic pollution. Whalley, Hawkes, Paisley & Trigg (WHPT) metrics replace the Biological Monitoring Working Party (BMWP) metrics used for status classifications in the first river basin planning cycle.
Phytobenthos are good indicators of nutrient enrichment and can be used to assess lake water quality. Diatoms are the main plant groups that we use because their silica cell walls make them easy to identify under the microscope.