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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...
May 2010
This is a very good result not only for the scores attained but also for the abundance of individuals.
| Location |
Bevern Stream – Holmans Old Railway Bridge . (Approx 100 metres down stream from bridge). |
| Date |
4th May 2010 |
| Grid Reference |
TQ415166 |
| Notes |
Moderate flow over mainly silt substrate. Light shade |
| Also netted in this sample. |
1 Bullhead plus 2 fry ( Cottus gobio), Mosquito pupae and various snail shells |
| Biological quality rating |
B. Good biological quality |
| Water quality rating |
Very good |
| Species |
Group |
BMWP Score |
| Ephemeridae |
Mayfly larva |
10 |
| Ephemerellidae |
Mayfly larva |
10 |
| Leptophlebiidae |
Mayfly larva |
10 |
| Lepidostomatidae |
Cased caddis fly larva |
10 |
| Leptoceridae |
Cased caddis fly larva |
10 |
| Goeridae |
Cased caddis fly larva |
10 |
| Limnephilidae |
Cased caddis |
7 |
| Gammaridae |
Shrimps |
6 |
| Hydoptilidae |
Cased caddis fly larva |
6 |
| Ancylidae |
River limpet |
6 |
| Hydropsychidae |
Caseless caddis fly larva |
5 |
| Elmidae |
Riffle beetle |
5 |
| Simuliidae |
Blackfly larvae |
5 |
| Baetidae |
Mayfly larva |
4 |
| Hydrobiidae |
Snail |
3 |
| Glossiphoniidae |
Leech |
3 |
| Sphaeriidae |
Mussels |
3 |
| Chironomidae |
Midge larvae |
2 |
| Oligochaeta |
Round worm |
1 |
| Total Score |
116 |
| ASPT (Average Score Per Taxon) |
6.1 |
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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