A variable species which occurs in a wide range of still or slowly flowing waters, which may be base-rich or base-poor, oligotrophic, mesotrophic or eutrophic, and exposed or sheltered. P. berchtoldii is sometimes found in brackish sites, but is usually replaced in such habitats by P. pusillus. 0-710 m (Lochan nan Cat, Mid Perth).
Until 1938, P. berchtoldii was confused with P. pusillus in our area. It is under-recorded by botanists who neglect linear-leaved pondweeds but may be over-recorded by others who fail to distinguish P. pusillus. Changes in its distribution are difficult to assess.
Circumpolar Boreo-temperate element.
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