Potamogeton gramineus
Tracheophyta
›Magnoliopsida›Potamogetonaceae›Potamogeton›Potamogeton gramineus
Ecology
This variable perennial is found in relatively shallow water in a variety of water bodies, including lakes, reservoirs, rivers, streams, canals and ditches. It tolerates a wide range of water quality, although it is absent both from the most acidic and oligotrophic sites and from the most eutrophic. It survives occasional, short-term desiccation. 0?915 m (Meall nan Tarmachan, Mid Perth).
Status
Native
Trends
Like many aquatics, P. gramineus is better recorded than it was in the 1962 Atlas. However, it has declined in England since 1930 in areas where eutrophication and the conversion of grazing land to arable have reduced the number of suitable ditches.
World Distribution
Circumpolar Boreo-temperate element.
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Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 12
Reaction (Ellenberg): 6
Nitrogen (Ellenberg): 3
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 3.3
July Mean Temperature (Celsius): 13.8
Annual Precipitation (mm): 1170
Length: 80
Perennation - primary
Perennial
Life Form - primary
Perennial hydrophyte (perennial water plant)
Woodiness
Herbaceous
Clonality - primary
Irregularly fragmenting (mainly water plants)
Clonality - secondary
Rhizome far-creeping
Count of 10km squares in Great Britain: 473
Count of 10km squares in Ireland: 163
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: 0.67
JNCC Designations
NBNSYS0000002131