Lakes and Watercourses
Lakes and Watercourses
Lakes and Watercourses
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APPENDIX 2<br />
Notonectidae, Pleidae, Corixidae, Haliplidae, Hygrobiidae, Dytiscidae,<br />
Gyrinidae, Hydrophilidae, Clambidae, Heledidae, Dryopidae, Elminthidae,<br />
Chrysomelidae, Curculionidae, Hydropsychidae,Tipulidae, Simuliidae,<br />
Planariidae, Dendrocoelidae.<br />
The following families score 4:<br />
Baetidae, Sialidae, Piscicolidae.<br />
The following families score 3:<br />
Valvatidae, Hydrobiidae, Lymnaeidae, Physidae, Planorbidae, Sphaeriidae,<br />
Glossiphoniidae, Hirudidae, Erpobdellidae, Asellidae.<br />
The following families score 2:<br />
Chironomidae.<br />
The following families score 1:<br />
Oligochaeta.<br />
(3) Danish fauna index (Skriver et al., in press) is calculated by<br />
• calculating the number of diversity groups (positive minus negative)<br />
using Table 1a below;<br />
• the fauna index is found using Table 1b below; the table is read from<br />
the top down, the index figure is that for the first group containing a<br />
genus or family found in the sample.<br />
Table 1a. Basis for calculating diversity groups<br />
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Positive<br />
Negative<br />
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Tricladida<br />
Oligochaeta ≥ 100 individuals<br />
Gammarus<br />
Helobdella<br />
All Plecoptera genera<br />
Erpobdella<br />
All Ephemeroptera genera<br />
Asellus<br />
Elmis<br />
Sialis<br />
Limnius<br />
Psychodidae<br />
Elodes<br />
Chironomus<br />
Rhyacophilidae<br />
Eristalinae<br />
All cased Trichoptera families Sphaerium<br />
Ancylus<br />
Lymnaea<br />
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