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This sample was taken 100m downstream from where we perform monthly water quality chemical tests. This is the nearest place downstream from the disused railway bridge at Holmans, Barcombe. We intend to carry out biological tests at this site on a regular basis to monitor the long term effects that water quality has on invertebrate life in the stream.
See the latest water quality test results for this location...
July 2008
Some of the Gammarus were parasitized by the Echynorrhincus polymorphous parasite. This is the best score so far in this stretch of the Bevern, which is very close to our previous “cattle drink” site. It seems evident that the planting of water crowfoot in this area has improved the habitat.
| Location |
Bevern Stream – Holmans Old Railway Bridge . (Approx 100 metres down stream from bridge). |
| Date |
31st July 2008 |
| Grid Reference |
TQ415166 |
| Notes |
Three minute kick sample in
riffle with dense Ranunculus, gravel substrate, open aspect, very low flow.
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| Also netted in this sample. |
11 bullheads, 1 minnow, Limnophera pupae, several Veliidae, water mites. |
| Biological quality rating |
C. Fair biological quality |
| Water quality rating |
Good |
| Species |
Group |
BMWP Score |
| Ephemeridae |
Mayfly nymphs |
10 |
| Ephemerellidae |
Mayfly nymphs |
10 |
| Lepidostomatidae |
Cased caddis |
10 |
| Calopterigidae |
Damselfly nymphs |
8 |
| Limnephilidae |
Cased caddis |
7 |
| Gammaridae |
Shrimps |
6 |
| Hydropsychidae |
Caseless caddis |
5 |
| Elminthidae |
Riffle beetle |
5 |
| Simuliidae |
Blackfly larvae |
5 |
| Baetidae |
Mayfly |
4 |
| Piscicolidae |
Fish leech |
4 |
| Hydrobiidae |
Snail |
3 |
| Lymnaeidae |
Spireshell snail |
3 |
| Glossiphoniidae |
Leech |
3 |
| Erpobdellidae |
Leech |
3 |
| Asellus |
Hoglouse |
3 |
| Sphaeriidae |
Mussels |
3 |
| Chironomidae |
Midge larvae |
2 |
| Oligochaeta |
Tubifex worm |
1 |
| Total Score |
95 |
| ASPT (Average Score Per Taxon) |
5.0 |
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