Page 247 - Freshwater-Biology-and-Ecology-Handbook

3.1.22 Extended Riverfly

indices

Extended Riverfly (117) is a development of the Anglers’
Riverfly Monitoring Initiative based on 33 taxa compared
to ARMI’s 8 – hence it is sometimes referred to as ARMI
33-group. The additional indicators are flatworms, molluscs,
annelids, crustaceans, alderflies, and true bugs.

It includes tolerant as well as sensitive indicators, making it
suitable for detecting a wider range of environmental issues
including pollution, low flow, and siltation. Samples must be
collected in the same way as for ARMI 8-group (the standard Figure 5.6
RIVPACS method for wadeable streams and rivers) and they Chart for identifying invertebrates used
are analysed on the bankside. for the Extended Riverfly index (117)

Two indices are included in the Extended Riverfly scheme:
Extended Riverfly index a water quality score, and a silt and flow score. Unlike ARMI
8-group, the index values for different taxa vary: from 4
for the most sensitive indicators to -4 for the most tolerant
This Riverfly Plus citizen science index is based on indicators (water quality index values) and 5 to -5 (silt and
a greater number of families than ARMI to provide a flow index values). Different index values are also allocated
more precise assessment of river quality. to each taxon according to its ARMI abundance categories
(Table 5.10). However, although crayfish and non-native
shrimps are included in the scheme and recorded, they are
not included in the water quality score or the silt and flow
score. See https://www.riverflies.org

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E Extended Riverfly Groups Site name:

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F Field Recording Form Grid reference:
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Recorder name(s):
The ARMI 8 groups Survey dates:
Season: April May June July August September
1 Flatworms
2 Freshwater Snails
3 Limpets
4 Bivalves
5 Aqua c Worms
6 Leeches
7 Crayfish
8 Water Hoglouse
9 Freshwater Shrimps
10 Invasive Non-Na ve Shrimps
11 Mayflies - Angler's Curse
12 Mayflies - Olives
13 Mayflies - Prong Gilled
14 Mayflies - Flatbodied
15 Mayflies - Green Drake
16 Mayflies - Blue-Winged Olive
17 Stoneflies
18 Dragonflies and Damselflies
19 Water Boatmen
20 Other Water Bugs
21 Water Beetles (Adults and Larvae)
22 Alderflies
23 Caseless Caddisflies - Green Sedge
24 Caseless Caddisflies - Net Spinners
25 Caseless Caddisflies - Non-Gilled
26 Cased Caddisflies - Hood Case-Maker
27 Cased Caddisflies - Weighted Case-Maker
28 Cased Caddisflies - Bush Tailed Caddisfly
29 Cased Caddisflies - Other
30 Craneflies
31 Blackflies
32 Non-Bi ng Midges
33 Water Snipe Flies
ARMI 8 group trigger: ARMI 8 group score:
Survey notes:
Informa on about the Riverfly database
and scoring systems is given overleaf
Recording Form version 2.6Aug 2021
Figure 5.7
Recording form for Extended Riverfly monitoring
Freshwater Biology and Ecology Handbook | 247
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