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ANNEX B: STANDARDS FOR ASSESSING THE IMPACT OF ACIDIFICATION ON BENTHIC INVERTEBRATE COMMUNITIES IN RIVERS
Table B1: Interim benthic invertebrate standards for rivers - standards indicative of the impacts of acidification on the benthic invertebrate quality element
Good ecological status or better | Moderate ecological status or worse |
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Samples collected between 1st November and 30th April | Samples collected between 1st May and 31st October | Samples collected between 1st November and 30th April | Samples collected between 1st May and 31st October |
Four or more taxa present from lists A and B combined, at least one of which is from List A | Three or more taxa from list A present | Less than four taxa present from list A and B combined; or no taxa from list A present | Less than three taxa from list A present |
Note on Table B1
The benthic invertebrate taxa applicable to lists A and B are specified in Table B2 below
Table B2: List A and List B benthic invertebrate taxa relevant to the application of the benthic invertebrate standards specified in Table B1
List A | List B |
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Gammarus pulex
Lymnaea peregra
Ancylus fluviatilis
Potamopyrgus jenkinsi
Baetis scambus
Alainites muticus
Caenis rivulorum
Perla bipunctata
Dinocras cephalotes
Esolus parallelepipedus
Glossosoma spp
Agapetus spp
Hydropsyche instabilis
Silo pallipes
Odontocerum albicorne
Philopotamus montanus
Wormaldia spp
Sericostoma personatum | Baetis rhodani
Rhithrogena semicolorata
Ecdyonurus spp
Electrogena lateralis
Serratella ignita
Perlodes microcephala
Chloroperla tripunctata
Hydropsyche pellucidula |
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