Freshwater Invertebrate Report 1998/2000
79
Lymnaea peregra
Planorbidae Planorbarius corneus
Planorbis planorbis
CRUSTACEA 3 species
Gammaridae Gammarus pulex
Asellidae Asellus aquaticus
Daphnidae Daphnia magna
Galleywood Common Field Meeting 16 April 2000
One day in April when it didn't rain saw a small group equipped for business at Galleywood Common
LNR to sample ponds. The first pond (TL703028) is a small scmi-pcrmancnt pond with pH of 5.5
(measured with paper indicators). It is on the edge of an area of recently restored lowland heath.
Smooth Newts and Common Frog were present. Sediment samples were taken with sweep nets.
Species were later identified as follows:
Hemiptera
Gerris gibbifer
Gerris lacustris
Notonecta glauca
Notonecta viridis
Plea leachi
Coleoptera
Copelatus haemorrhoidalis
Ephemeroptera
Cloeon dipterum
Trichoptera
Limnephilus vittatus
Odonata
Ischnura elegans
Diptera/Chironomidae
Psectrotanypus varians
Also collected but not identified were dragonfly and ceratopogonid larvae and Oligochaetes.
The second pond (TL704024) is a larger permanent pond, again with a pH of 5.5. It is enclosed by
in area of secondary woodland;
Hemiptera
Notonecta glauca
Hydrometra stagnorum
Hesperocorixa sahlbergi
Coleoptera
Copelatus haemorrhoidalis
Essex Naturalist (New Series) 17 (2000)