A303 Bridge – 2014

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  May 14  Jun 14  Jul 14 Aug 14
Target Groups Number Category Number Category Number Category Number Category
Cased caddis  9  a  75  b  22  b  18  b
Caseless caddis  8  a  5  a  –  2  a
Mayflies  –  3  a  1  a  1  a
Blue-winged olives  4  a  5  a  3  a  1  a
Flat-bodies  –  2  a  4  a  2  a
Olives  50  b  62  b  135  c  50  b
Stoneflies  –  –  –  5  a
Freshwater shrimp  50  b  30  b  20  b  90  b
Site score  7  10  10  11
Notes
Invasive Species
American signal crayfish NO NO NO NO
Himalayan balsam  YES YES YES YES
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  Leeches Leeches Freshwater limpet Bullhead  Bullhead
River depth close 20cm 20cm 15cm 15cm
River depth middle 20cm 20cm 15cm 15cm
River depth far 30cm 30cm 20cm 20cm

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Date  Sep 14 Oct 14  Nov 14 Dec 14
Target Groups Number Category Number Category Number Category Number Category
Cased caddis 55  b  21 b
Caseless caddis  –  –
Mayflies  2  a  –
Blue-winged olives  1  a  2  a
Flat-bodies  –  2  a
Olives  40  b  98  b
Stoneflies  –  –
Freshwater shrimp  146  c  110  c
Site score  9  9
Notes
Invasive Species
American signal crayfish NO NO NO NO
Himalayan balsam YES YES NO 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  Leeches Leeches, Bullhead
River depth close 10cm 10cm cm cm
River depth middle 15cm 15cm cm cm
River depth far 15cm 10cm cm cm

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