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Offwell Wetland Survey

Area D - Open Water Zone

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There is a fairly narrow stretch of open water (approximately 3m wide) in the southern area of the wetland between the swamp zone and the embankment. The water exits the wetland from the open water zone via a spillway on the dam wall. This area is characterised by Duckweed, Canadian Pondweed, Starwort and Broad-leaved Pondweed.

 

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Common Duckweed

Canadian Pondweed

 

Submerged plant adaptations


Plant Species List for Area D

Callitrichaceae

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Callitriche platycarpa Kutz. Various-Leaved Water-Starwort
Callitriche stagnalis Scop. Common Water-Starwort
Hydrocharitaceae

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Elodea canadensis Canadian Pondweed
Potamogetonaceae

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Potamogeton natans L. Broad-leaved Pondweed
Lemnaceae

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Lemna minor L. Common Duckweed

  Animal Species List for Area D

Amphibians

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Bufo bufo Common Toad
Rana temporaria Common Frog
Triturus helveticus Palmate Newt

Fish

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Gasterosteus aculeatus Three-spined stickleback

Insects

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Ephemeroptera (Mayflies)

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Cloeon dipterum (Linnaeus)

Mayfly Larva

Odonata

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Coenagrion puella (Linnaeus) Azure Damselfly Larva
Aeschna cyanea (Muller) Southern Hawker Dragonfly Larva

Sialidae (Alderflies)

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Sialis lutaria (Linnaeus) Alderfly larva

Hemiptera (Water bugs)

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* Sigara limitata (Fieber) Lesser Water boatman

Coleoptera (Beetles)t

Haliplus confinis Stephens t

Molluscs

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Pisidium sp. Pea Cockle
Aplexa hypnorum (Linnaeus) Moss Bladder Snail

*Tentative identification

These species lists are not exhaustive. They represent  initial collections and identifications carried out in early autumn. Many species of flowering plants may already have flowered and died back at this time and would therefore have been missed.  The animal species list is also only a very small representative selection of the total community present. These lists will be updated periodically.

 

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Wetland Survey Contents

 

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