Llyn Goddionduon
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Description
Description A natural, shallow, acid lake with a fairly low nutrient status and a very low level of productivity. It has some well developed areas of emergent and floating-leaved vegetation, dominated by such plants as water horsetail Equisetum fluviatile, common spike-rush Eleocharis palustris, common reed Phragmites australis, floating pondweed Potamogeton natans, bogbean Menyanthes trifoliata and white water lily Nymphaea alba. There is a good population of water lobelia Lobelia dortmanna and excellent swards of benthic species such as shore-weed Littorella uniflora. The lake is reasonably rich in phytoplankton and in aquatic invertebrate animals. Remarks: Within the Snowdonia National Park.
Species mentioned
Show the 8 species mentioned in the description, with red-list status| English name search for this in other sites |
Latin name search with Google |
IUCN / Red List | Type | Family |
|---|---|---|---|---|
| common reed | Phragmites australis | LC | grass | poaceae |
| water horsetail | Equisetum fluviatile | LC | herb | equisetaceae |
| shoreweed | Littorella uniflora | LC | herb | plantaginaceae |
| water lobelia | Lobelia dortmanna | LC | herb | campanulaceae |
| bogbean | Menyanthes trifoliata | LC | herb | manyanthaceae |
| white water-lily | Nymphaea alba | LC | herb | nymphaeaceae |
| broadleaved pondweed | Potamogeton natans | LC | herb | potamogetonaceae |
| common spike rush | Eleocharis palustris | LC | rush | juncaceae |
Insects to look out for
These moths, butterflies and beetles are known to feed on plants recorded at this site, and carry a notable UK conservation status — but a host-plant being present doesn't mean the insect has actually been recorded here. Treat this as "worth watching for," not a confirmed sighting.
| Species | Status | Via host-plant |
|---|---|---|
| White-mantled wainscot Archanara neurica |
Near Threatened | Phragmites australis |
| Garden tiger Arctia caja |
Near Threatened | Equisetum fluviatile |
| Reed leopard Phragmataecia castaneae |
Near Threatened | Phragmites australis |
| Fenn's wainscot Protarchanara brevilinea |
Near Threatened | Phragmites australis |
Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.