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 />
Sandbowl Snail<br />
Quickella arenaria<br />
Shining Ram’s-horn Snail<br />
Segmentina nitida<br />
Witham Orb Mussel<br />
Sphaerium solidum<br />
Cylindrica Whorl Snail<br />
Truncatellina cylindrica<br />
Large-mouthed Valve Snail<br />
Valvata macrostoma<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 />
58<br />
Other survey<br />
work<br />
completed or<br />
in progress<br />
Comments<br />
A - - Not recorded in Norfolk<br />
Current UK Species Action Plan<br />
RDB Species<br />
Known from only three UK sites, all sand<br />
dune habitats.<br />
Internationally threatened – Loss of dune<br />
environments and falling water levels.<br />
P 79 17 Current UK Species Action Plan<br />
Found in unpolluted, usually calcareous<br />
water in the ponds and drains of grazing<br />
marshes.<br />
Declining – Causes unclear but believed to<br />
be over-frequent ditch clearance,<br />
eutrophication due to fertiliser run-off, and<br />
conversion of grazing levels to arable<br />
farming, with associated water table<br />
lowering.<br />
Norfolk Action Plan published December<br />
1998, revised January 2003.<br />
A - - Not recorded in Norfolk<br />
Little is known about the habitat<br />
requirements of this species. However,<br />
where it does occur the water bodies support<br />
a wide range of molluscan fauna.<br />
Marked decline in UK – Causes unclear but<br />
may be linked to eutrophication and<br />
pollution.<br />
New to national list of BAP priority<br />
species 2007<br />
P ? ? County Recorder RDB Species<br />
Associated with dry, calcareous grassland<br />
and occasionally on sand dunes.<br />
Marked decline in UK – Habitat loss and<br />
degradation.<br />
New to national list of BAP priority<br />
species 2007<br />
P 45 21 RDB Species<br />
Quite widespread in suitable habitat.<br />
Associated with coastal and floodplain<br />
grazing marshes.<br />
Internationally threatened – Habitat loss,<br />
degradation and pollution.<br />
New to national list of BAP priority<br />
species 2007