home news data collection points documents about links interesting stuff images members gallery

 

 

Mayfly in the classroom

Mayfly on the radar

Reintroducing invertebrates

Europe's largest mayfly

BMWP scores

Interesting Stuff 6

 

 

 

 

5

So what's the score?

  • Blue Winged Olives - and the others

The Biological Monitoring Working Party (BMWP) scoring system is a method of assessing water quality using the families of insects - e.g. mayflies and stoneflies - and other aquatic invertebrates such as freshwater shrimps present in a river. Species are allotted points to rank their importance in the ecosystem, the less tolerant a group of invertebrates is to pollution the higher the points they are allotted.

 

This explains the distinction the Riverfly Partnership data sheets make between Blue Winged Olives, Ephemerellidae, which are particularly intolerant to pollution, scoring 10 points in the BMWP system and the other up winged flies called Olives, Baetidae, which only score 4 points - an appreciable difference.

Learning to distinguish between these two particular groups is an important part of our monitoring which deserves particular attention.

 

 

GROUP

FAMILIES

SCORE

 

Mayflies

 

Stoneflies

 

River bug

Caddis or Sedge flies

 

Siphlonuridae, Heptageniidae, Leptophlebiidae

Ephemerellidae, Potamanthidae, Ephemeridae

Taeniopterygidae, Leuctridae, Caprniidae, Perlodidae, Perlidae, Chloroperlidae

Aphelocheridae

Phryganeidae, Molannidae, Beraeidae, Odontoceridae, Leptoceridae, Goeridae, Lepidostomatidae, Brachycentridae, Sericostomatidae

 

 

 

10

 

10

10

 

10

 

Crayfish

Dragonflies

 

Astacidae

Lestidae, Agriidae, Gomphidae, Cordulegasteridae, Aeshnidae, Corduliidae, Libelluiidae

 

 

8

 

8

 

Mayflies

Stoneflies

Caddis or Sedge flies

 

 

Caenidae

Nemouridae

Rhyacophilidae, Polycentropidae, Limnephilidae

 

7

7

7

 

Snails

Caddis or Sedge flies

Mussels

Shrimps

Dragonflies

 

 

Neritidae, Viviparidae, Ancylidae

Hydroptilidae

Unionidae

Corophiidae, Gammaridae

Platycnemididae, Coenagriidae

 

6

6

6

6

6

 

Bugs

 

Beetles

 

Caddis or Sedge flies Craneflies/Blackflies

Flatworms

 

 

Mesoveliidae, Hydrometridae, Gerridae, Nepidae, Naucoridae, Notonectidae, Pleidae, Corixidae

Haliplidae, Hygrobiidae, Dytiscidae, Gyrinidae, Hydrophilidae, Clambidae, Helodidae, Dryopidae, Elmidae, Chrysomelidae, Curculionidae

Hydropsychidae

Tipulidae, Simuliidae

Planariidae, Dendrocoelidae

 

 

5

 

 

5

5

5

5

 

Mayflies

Alderflies

Leeches

 

 

Baetidae

Sialidae

Piscicolidae

 

4

4

4

 

Snails

Cockles

Leeches

Hog Louse

 

 

Valvatidae, Hydrobiidae, Lymnaeidae, Physidae, Planorbidae

Sphaeriidae

Glossiphoniidae, Hirudidae, Erpobdellidae

Asellidae

 

3

3

3

3

 

Midges

 

 

Chironomidae

 

2

 

Worms

 

Oligochaeta (whole class)

 

 

1

Sheep Dip
Cypermethrin
0