Ranunculus circinatus
Ecology
A perennial herb of clear, base-rich, standing or very slowly flowing water, most frequently in lakes, flooded gravel-pits, sluggish streams and rivers, canals and ditches. It usually grows at depths of 1-3 m in meso-eutrophic or eutrophic water; only growing in shallower water if it does not dry up in summer. 0-310 m (Akermoor Loch, Selkirks.).
Status
Trends
Unlike most aquatic Ranunculus species, this is an easily recognised plant which should be well recorded. It has declined across much of its range because of habitat destruction and eutrophication. It was lost from many sites before 1930, but the decline has continued since the 1962 Atlas.
World Distribution
Eurasian Temperate element.
Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 12
Reaction (Ellenberg): 7
Nitrogen (Ellenberg): 7
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.7
July Mean Temperature (Celsius): 15.8
Annual Precipitation (mm): 753
Length: 75
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 575
Count of 10km squares in Ireland: 76
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.34
JNCC Designations
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
Atlas (23d)
.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1989)
.
1997. Aquatic plants in Britain and Ireland.