Zannichellia palustris
Ecology
This submerged, perennial aquatic grows in a range of shallow-water habitats. The most characteristic include clear chalk streams, eutrophic lakes and ponds, and brackish lagoons, ponds and ditches. It is a frequent colonist of disused mineral workings. 0-380 m (Llynheilyn, Rads.).
Status
Trends
Z. palustris is much more frequent within its British and Irish range than was shown in the 1962 Atlas. This probably represents more effective recording, but there is evidence for the expansion of this species in S. Scotland, in response to eutrophication. Conversely, the current map shows a decline in England, presumably from drainage and ditch improvements.
World Distribution
Circumpolar Southern-temperate element.
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Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 12
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 2
January Mean Temperature (Celsius): 3.8
July Mean Temperature (Celsius): 15.5
Annual Precipitation (mm): 820
Length: 50
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Clonality - secondary
Count of 10km squares in Great Britain: 1196
Count of 10km squares in Ireland: 206
Count of 10km squares in the Channel Isles: 5
Atlas Change Index: 0.17
Weighted Changed Factor: -10
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
Atlas (310d)
.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
.
1997. Aquatic plants in Britain and Ireland.