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A303 Bridge – 2015

These results are taken from kick sampling conducted beneath the bridge where the A303 Wincanton Bypass crosses the river Cale; UK grid reference ST71100 27786.

 

Date April 2015  May 2015  June 2015 July 2015
Target Groups Number Category Number Category Number Category Number Category
Cased caddis 15 b  13  b  17  b  8 b
Caseless caddis  –  2  a  3  a  –
Mayflies  1  a  –  –  –
Blue-winged olives  1  a  1  a  4 a  6 a
Flat-bodies  5  a  –  –  2 a
Olives  8  a  15  b  2  a  51 b
Stoneflies  1  a  1  a  2  a  3 a
Freshwater shrimp  8  a  10  b  8  a  9  a
Site score  8  9  7  8
Notes
Invasive Species
American signal crayfish  NO  NO  NO  NO
Himalayan balsam  NO  YES  YES  NO
Japanese knotweed  NO  NO  NO  NO
Giant hogweed  NO  NO  NO  NO
Floating pennywort  NO  NO  NO  NO
American skunk cabbage  NO  NO  NO  NO
Other species noted Assorted leeches Water snails, freshwater limpet Leeches, bullheads Water snails, beetles, bullheads
River depth close 30cm 8cm 15cm 18cm
River depth middle  30cm 10cm 15cm 20cm
River depth far  30cm 8cm 15cm 18cm

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