Dyma'r disgrifiad y dois i o hyd iddo ar y we.
Fens can also be described as `poor-fens` or `rich-fens`. Poor-fens,
where the water is derived from base-poor rock such as sandstones and
granites occur mainly in the uplands, or are associated with lowland
heaths. They are characterised by short vegetation with a high
proportion of bog mosses Sphagnum spp. and acid water (pH of 5 or less).
Rich-fens, are fed by mineral-enriched calcareous waters (pH 5 or more)
and are mainly confined to the lowlands and where there are localised
occurrences of base-rich rocks such as limestone in the uplands. Fen
habitats support a diversity of plant and animal communities. Some can
contain up to 550 species of higher plants, a third of our native plant
species; up to and occasionally more than half the UK`s species of
dragonflies, several thousand other insect species, as well as being an
important habitat for a range of aquatic beetles.
Byddwn yn ddiolchgar am unrhyw awgrym. Newydd holi rhywun sy'n gwneud
tipyn o gwaith i Asiantaeth yr Amgylchedd a doedd hi ddim yn gwybod ond
ei hawgrym hi oedd 'ffeniau toreithiog.'
--
Dr Sylvia Prys Jones 01248 382036 <[log in to unmask]>
Pennaeth yr Uned Gyfieithu/Head of Translation Unit
Canolfan Bedwyr
Prifysgol Bangor/Bangor University
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