Llyn Llygeirian
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Climate exposure
This is about exposure to a nationwide pressure this habitat type carries — not a verdict on this site's own management.
Peat habitats store centuries of carbon and depend on a stable, waterlogged water table. Warmer, drier summers dry out peat, making it far more vulnerable to wildfire and to carbon release — a pressure that can undo years of restoration work regardless of how well the site is otherwise managed.
Habitats
Geology & landscape
Landscape processes: Peatland / Mire
Birds & fish recorded
Birds
| Species | Season |
|---|---|
| gadwall | Wintering |
Description
Description Llyn Llygeirian is selected for its biological interest as an example of a moderately base-rich lake in West Gwynedd. The flora of the lake as a whole includes a range of aquatic macrophyte species. Low-growing species, e.g. shore weed Littorella uniflora, occur on the more exposed margins; various floating-leaved plants, including the regionally rare frogbit Hydrocharis morsus-ranae, and submerged macrophytes, e.g. the water-milfoils Myriophyllum alterniflorum and Myriophyllum spicatum, are present; reedswamp with a variety of emergent species, e.g. bulrush Typha latifolia, flowering rush Butomus umbellatus and bottle sedge Carex rostrata, is well represented and there are also peripheral willow carr and mire communities. Llyn Llygeirian is additionally important for the occurrence of several nationally uncommon aquatic species: the two waterworts Elatine hydropiper and Elatine hexandra needle spike-rush Eleocharis acicularis, spring quillwort Isoetes echinospora and pillwort Pilularia globulifera. Although this lake is not of major significance for wildfowl, it does support a number of overwintering species, notably gadwall and whooper swans.
Species mentioned
Show the 13 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 |
|---|---|---|---|---|
| gadwall | Mareca strepera | LC (NonBreeding), LC (Breeding) | bird-duck | anatidae |
| reedmace | Typha latifolia | LC | bulrush | typhaceae |
| spring quillwort | Isoetes echinospora | LC | fern | isoetaceae |
| pillwort | Pilularia globulifera | VU | fern | marsileaceae |
| flowering rush | Butomus umbellatus | LC | herb | butomaceae |
| six-stamened waterwort | Elatine hexandra | LC | herb | elatinaceae |
| eight stamened waterwort | Elatine hydropiper | LC | herb | elatinaceae |
| frogbit | Hydrocharis morsus-ranae | VU | herb | hydrocharitaceae |
| shoreweed | Littorella uniflora | LC | herb | plantaginaceae |
| alternate water-milfoil | Myriophyllum alterniflorum | LC | herb | haloragaceae |
| spiked water-milfoil | Myriophyllum spicatum | LC | herb | haloragaceae |
| needle spike rush | Eleocharis acicularis | VU | rush | juncaceae |
| mire bottle sedge | Carex rostrata | LC | sedge | cyperaceae |