FW3A Schoenoplectus lacustris – Sparganium erectum swamp


  • Freshwater habitats (FW)
  • FW3 Phragmites australis – Cladium mariscus group
  • FW3A Schoenoplectus lacustris – Sparganium erectum swamp
Scientific name:
Schoenoplectus lacustris – Sparganium erectum swamp
Common name:
Common Club-rush – Branched Bur-reed swamp
Community code:
FW3A
Full PDF Synopsis
FW3A map: Nymphaea alba – Phragmites australis aquatic community

FW3A Schoenoplectus lacustris – Sparganium erectum swamp

Vegetation

Schoenoplectus lacustris, Sparganium erectum and Apium nodiflorum are constants within this swamp community. Of the other emergents, Phalaris arundinacea is frequently encountered while Berula erecta and Myosotis scorpioides are occasionally found. An accompanying element of floating-leaf and free-floating plants is characterised by Nuphar lutea with Potamogeton natans, Potamogeton crispus and Lemna minor occasional. Sparganium emersum is a frequent plant which may contribute to either or both of these elements. Submerged plants may also occur but are infrequent, the chief species are likely to be the non-native Elodea canadensis, submerged forms of Veronica anagallis-aquatica, the bryophyte Fontinalis antipyretica and Myriophyllum spicatum.

Ecology

This is a community of lowland freshwater river systems with fairly base-rich and eutrophic waters.

Sub-communities

No sub-communities are currently described.

Similar communities

Schoenoplectus lacustris is also a constant in community FW3D Schoenoplectus lacustris swamp. In that less diverse assemblage, Sparganium erectum and Nuphar lutea are much less frequent, however, and S. lacustris tends to dominate.

Conservation value

Elodea canadensis is an invasive non-native species found in this community but it is not considered a major ecological threat and has already colonised much of its suitable niche in Ireland.

Management

This community may be affected by eutrophication, river engineering including dredging and canalisation, clearance works for navigation and trampling from livestock with access to the bankside.

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