NORFOLK BIODIVERSITY ACTION PLAN SPECIES DATA AUDIT ...
NORFOLK BIODIVERSITY ACTION PLAN SPECIES DATA AUDIT ...
NORFOLK BIODIVERSITY ACTION PLAN SPECIES DATA AUDIT ...
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Species Present<br />
or<br />
absent<br />
in<br />
Norfolk<br />
Swollen Spire Snail<br />
Mercuria similis (M. confusa)<br />
Glutinous Snail<br />
Myxas glutinosa<br />
Mud Snail<br />
Omphiscola glabra<br />
(Lymnaea glabra)<br />
Fine-lined Pea Mussel<br />
Pisidium tenuilineatum<br />
Depressed River Mussel<br />
Pseudanodonta complanata<br />
No. of<br />
records in<br />
database<br />
No. of<br />
1km<br />
squares<br />
recorded<br />
since<br />
1980<br />
Possible other<br />
sources<br />
of data sets<br />
57<br />
Other survey<br />
work<br />
completed or<br />
in progress<br />
Comments<br />
P ? ? County Recorder RDB Species<br />
Found at Wheatfen Broad, Rockland Broad<br />
and in the river Yare. It is also found in the<br />
Waveney where it has extended its range.<br />
Typically found on bare mud exposed at low<br />
tide beneath emergent vegetation such as<br />
Phragmites australis or Glyceria maxima.<br />
Declining – Salinity changes, flood defence<br />
works and climate change.<br />
New to national list of BAP priority<br />
species 2007<br />
A 3 - Last Norfolk record in 1968. Considered<br />
extinct in Norfolk.<br />
Endangered. Current Species Action Plan<br />
Occurs in clear, hard water which is free<br />
from fine sediment and nitrate/phosphate<br />
pollution.<br />
Marked decline in UK – Disturbance and<br />
pollution.<br />
P 1 1 RDB Species<br />
Discovered in a pingo on East Walton<br />
Common.<br />
Typically found in acidic, nutrient poor water<br />
with little other aquatic life.<br />
Declining – Habitat loss but may be underrecorded.<br />
New to national list of BAP priority<br />
species 2007<br />
A - - Not recorded in Norfolk<br />
Current Species Action Plan<br />
Found within many canal and river sites to<br />
the north of London.<br />
Declining – Causes unclear but probably<br />
linked to declines in water quality. May be<br />
under-recorded.<br />
P 76 42 Current UK Species Action Plan<br />
Occurs in lowland river, drains, canals and<br />
ditches.<br />
Described as declining nationally – Pollution<br />
and drought. Although this species is<br />
extending its range in the River Waveney.<br />
Norfolk Action Plan published December<br />
1998, revised January 2003.