North Cave Wetlands – 26/04/2018

Update 03/05/2018

The photograph of Eristalis tenax has been re-determined as Eristalis similis. This is a rare migrant first recorded in the UK in 1990. Ian Andrews one of the local experts picked up that this didn’t look right for tenax, due to the lack a dark vertical hair bands on the eyes. I’d made my ID based on its large size and the black tarsus on the front legs, ruling out pertinax but also felt id didn’t quite look right for tenax. The key feature to separate them isn’t very clear on this photo, but can just be made out through the top wing. The dark femur contrasting with the thin pale tibia. On tenax the tibia would be dark and broad. The determination was confirmed by Gerard Pennards, a European specialist.

Eristalis tenaxEristalis tenax

An early afternoon visit with intermittent sun and occasional short showers. A fresh westerly with temperatures around 11 degrees C. Alder Leaf Beetle Agelastica cf. alni is a potential new species though still to be confirmed. Its larger size compared to the smaller species making it stand out, at first I thought I’d found my first Blue Shieldbug of the year. A couple of weevils noted included Liophloeus tessulatus which I couldn’t get a photo of due to the wind blowing the vegetation around. The second was Tropiphorus terricola found along the path adjacent to the Maize Field.

Alder Leaf Beetle - Agelastica cf. alniAlder Leaf Beetle – Agelastica cf. alni

Tropiphorus terricolaTropiphorus terricola

The wind kept most butterflies at bay, only a single Green-veined White Pieris napi noted. A nice sized Drinker Euthrix potatoria caterpillar was found along the north path.

66.010 Drinker - Euthrix potatoriaDrinker – Euthrix potatoria

Marsham’s Nomad Bee Nomada marshamella was new for the year along the western path. Tree Bumblebee Bombus hypnorum was new for the year, with Buff-tailed Bumblebee Bombus terrestris, Common Carder Bee Bombus pascuorum and Large Red-tailed Bumblebee Bombus lapidarius also noted.

Marsham's Nomad Bee - Nomada marshamellaMarsham’s Nomad Bee – Nomada marshamella

Tawny Mining Bee - Andrena fulvaTawny Mining Bee – Andrena fulva

Quite a few of these Moth Fly species along the western path, unable to ID to species, but worthy of attention none the less.


The best hoverfly day so far this year, with Epistrophe eligans, Eristalis arbustorum, Platycheirus albimanus and Sphaerophoria scripta all new for the year.

Epistrophe eligansEpistrophe eligans

Eristalis arbustorumEristalis arbustorum

Eristalis pertinaxEristalis pertinax

Platycheirus albimanusPlatycheirus albimanus

Sphaerophoria scriptaSphaerophoria scripta

A couple of other fly species noted included St Marks Fly Bibio marci and Norellisoma cf. spinimanum.

St Marks Fly - Bibio marciSt Marks Fly – Bibio marci

Norellisoma cf. spinimanumNorellisoma cf. spinimanum

Bird-wise a singing Cetti’s Warbler Cettia cetti was a new site record for me, only the second to have been recorded on the reserve. A Swift Apus apus over Village Lake was my first for the year. Finally the Pink-footed Goose Anser brachyrhynchus showed well in North Field.

Species list
Birds (52)

Avocet – Recurvirostra avosetta
Black-headed Gull – Chroicocephalus ridibundus
Blackbird – Turdus merula
Blackcap – Sylvia atricapilla
Blue Tit – Cyanistes caeruleus
Buzzard – Buteo buteo
Carrion Crow – Corvus corone
Cetti’s Warbler – Cettia cetti
Chaffinch – Fringilla coelebs
Common Gull – Larus canus
Coot – Fulica atra
Cormorant – Phalacrocorax carbo
Feral Pigeon – Columba livia
Gadwall – Anas strepera
Goldfinch – Carduelis carduelis
Great Crested Grebe – Podiceps cristatus
Greylag Goose – Anser anser
Herring Gull – Larus argentatus
House Martin – Delichon urbicum
Jackdaw – Corvus monedula
Kestrel – Falco tinnunculus
Lapwing – Vanellus vanellus
Lesser Black-backed Gull – Larus fuscus
Linnet – Linaria cannabina
Little Ringed Plover – Charadrius dubius
Long-tailed Tit – Aegithalos caudatus
Mallard – Anas platyrhynchos
Mediterranean Gull – Larus melanocephalus
Moorhen – Gallinula chloropus
Mute Swan – Cygnus olor
Oystercatcher – Haematopus ostralegus
Pied Wagtail – Motacilla alba yarrellii
Pink-footed Goose – Anser brachyrhynchus
Pochard – Aythya ferina
Red-legged Partridge – Alectoris rufa
Reed Bunting – Emberiza schoeniclus
Robin – Erithacus rubecula
Rook – Corvus frugilegus
Sand Martin – Riparia riparia
Sedge Warbler – Acrocephalus schoenobaenus
Shelduck – Tadorna tadorna
Shoveler – Anas clypeata
Skylark – Alauda arvensis
Starling – Sturnus vulgaris
Swallow – Hirundo rustica
Swift – Apus apus
Teal – Anas crecca
Tufted Duck – Aythya fuligula
Wigeon – Anas penelope
Willow Warbler – Phylloscopus trochilus
Woodpigeon – Columba palumbus
Wren – Troglodytes troglodytes

Beetles (4)
7-spot Ladybird – Coccinella septempunctata
Alder Leaf Beetle – Agelastica alni
Liophloeus tessulatus
Tropiphorus terricola

Butterflies and Moths (2)
Green-veined White – Pieris napi
Drinker – Euthrix potatoria

Bees (6)
Buff-tailed Bumblebee – Bombus terrestris
Common Carder Bee – Bombus pascuorum
Large Red-tailed Bumblebee – Bombus lapidarius
Marsham’s Nomad Bee – Nomada marshamella
Tawny Mining Bee – Andrena fulva
Tree Bumblebee – Bombus hypnorum

Psychodidae (1)
Indet. Mothfly

Hoverflies (6)
Epistrophe eligans
Eristalis arbustorum
Eristalis pertinax
Eristalis similis
Platycheirus albimanus
Sphaerophoria scripta

Flies (2)
St Marks Fly – Bibio marci
Norellisoma spinimanum