Sevenoaks Gravel Pits

Site of Special Scientific Interest · 51.2912, 0.1818

Also within

Kent County

Condition (Natural England)

Favourable (1)
UnitFeatureConditionArea (ha)Assessed
TQ522569 Favourable 73.7 2009-02-27

Birds & fish recorded

Birds

SpeciesSeason
great crested grebe Breeding
great crested grebe Passage
great crested grebe Wintering
green sandpiper Breeding
green sandpiper Passage
green sandpiper Wintering
greenshank Breeding
greenshank Passage
greenshank Wintering
greylag goose Breeding
greylag goose Passage
greylag goose Wintering
little ringed plover Breeding
little ringed plover Passage
little ringed plover Wintering
mallard Breeding
mallard Passage
mallard Wintering
pochard Breeding
pochard Passage
pochard Wintering
reed warbler Breeding
reed warbler Passage
ringed plover Breeding
ringed plover Passage
ringed plover Wintering
sand martin Breeding
sand martin Passage
sedge warbler Breeding
sedge warbler Passage
sedge warbler Wintering
shelduck Breeding
shelduck Passage
shelduck Wintering
shoveler Breeding
shoveler Passage
shoveler Wintering
teal Breeding
teal Passage
teal Wintering
tufted duck Breeding
tufted duck Passage
tufted duck Wintering
whitethroat Breeding
whitethroat Passage

Description

Area, 71.0 ha. 175.3 ac. Description The interest of this group of lakes, formed by the flooding of the former gravel workings and fed by the River Darenth, centres on its breeding bird populations. Extensive landscaping to create shallows, spits and islands and the planting of trees and aquatic plants have provided conditions suitable for both breeding and wintering birds. The most numerous breeding species are Canada and greylag goose, mallard and tufted duck. Many other water birds breed including great crested grebe, kingfisher, moorhen and coot. Wintering and passage wildfowl include pochard, shelduck, teal and shoveler and passage waders are also attracted including greenshank and green sandpiper. The uncommon little ringed plover is a regular breeding species here. The woodland and reed beds support a typical range of song birds including whitethroat, reed warbler and sedge warbler. There is also a large rookery and a sand martin colony in a sand face in the south of the site. sand martin have undergone a major fluctuation in population levels in recent years and this face supports one of the few significant colonies in West Kent. The botanical and entomological interest of the site is also known to be developing. Thirteen species of Odonata dragonflies are present including the locally distributed downy emerald dragonfly Cordulia aenea. Plants of note include small cud weed Logfia minima, dwarf elder Sambucus ebulus and slender bird's foot trefoil Lotus angustissimus.

Species mentioned

English name
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Latin name
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IUCN / Red List Type Family
teal Anas crecca LC (NonBreeding), LC (Breeding) bird-duck anatidae
mallard Anas platyrhynchos NT (NonBreeding), LC (Breeding) bird-duck anatidae
pochard Aythya ferina EN (NonBreeding), EN (Breeding) bird-duck anatidae
tufted duck Aythya fuligula LC (NonBreeding), LC (Breeding) bird-duck anatidae
shoveler Spatula clypeata LC (NonBreeding), LC (Breeding) bird-duck anatidae
shelduck Tadorna tadorna EN (NonBreeding), EN (Breeding) bird-duck anatidae
coot Fulica atra NT (NonBreeding), NT (Breeding) bird-gallinule rallidae
moorhen Gallinula chloropus VU (Breeding) bird-gallinule rallidae
greylag goose Anser anser LC (NonBreeding) bird-goose anatidae
great crested grebe Podiceps cristatus LC (NonBreeding), VU (Breeding) bird-grebe podicipedidae
kingfisher Alcedo atthis LC (Breeding) bird-kingfisher alcedinidae
sand martin Riparia riparia LC (Breeding) bird-martin hirundinidae
little ringed plover Charadrius dubius LC (Breeding) bird-wader charadriidae
ringed plover Charadrius hiaticula VU (NonBreeding) bird-wader charadriidae
greenshank Tringa nebularia LC (Breeding) bird-wader scolopacidae
green sandpiper Tringa ochropus EN (NonBreeding), EN (Breeding) bird-wader scolopacidae
sedge warbler Acrocephalus schoenobaenus LC (Breeding) bird-warbler acrocephalidae
reed warbler Acrocephalus scirpaceus LC (Breeding) bird-warbler acrocephalidae
whitethroat Sylvia communis Not listed in GB list bird-warbler sylviidae
downy emerald dragonfly Cordulia aenea LC dragonfly cordulidae
slender cudweed Logfia minima LC herb asteraceae
slender birds foot trefoil Lotus angustissimus NT herb fabaceae

Plant communities

A9 — Fast flowing river and stream, Marginal and inundation, Pond ditch and canal, Sluggish river and stream

Potamogeton natans community

Schoenoplectus lacustris, Juncus bulbosus, Sparganium angustifolium, Sparganium erectum, Sparganium minimum, Alisma plantago-aquatica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Elodea canadensis, Lemna minor, Lemna trisulca, Nymphaea alba, Callitriche platycarpa, Callitriche stagnalis, Littorella uniflora, Potamogeton natans, Ranunculus trichophyllus, Glyceria fluitans, Chara subspinosa

A14 — Fast flowing river and stream

Myriophyllum alterniflorum community

Isolepis fluitans, Juncus bulbosus, Fontinalis antipyretica, Lobelia dortmanna, Equisetum fluviatile, Myriophyllum alterniflorum, Lemna minor, Callitriche stagnalis, Littorella uniflora, Potamogeton filiformis, Potamogeton gramineus, Potamogeton natans, Ranunculus peltatus, Chara spp., Nitella hyalina

A17 — Chalk river and stream, Fast flowing river and stream

Ranunculus penicillatus ssp. pseudofluitans community

Berula erecta, Nasturtium officinale, Elodea canadensis, Lemna minor, Callitriche stagnalis, Veronica beccabunga, Polygonum amphibium, Polygonum hydropiper, Potamogeton crispus, Potamogeton pectinatus, Ranunculus penicillatus ssp. pseudofluitans

A18 — Fast flowing river and stream

Ranunculus fluitans community

Fontinalis antipyretica, Fontinalis squamosa var. curnowii, Myriophyllum alterniflorum, Myriophyllum spicatum, Elodea canadensis, Mentha aquatica, Lemna gibba, Lemna minor, Potamogeton perfoliatus, Ranunculus fluitans, Glyceria fluitans, Phalaris arundinacea