North Cave Wetlands – 09/08/2018

An overcast morning visit with a light westerly breeze, temperatures around 18 degrees C. The overcast conditions meant reduced activity on the Dragonfly front, though it did offer the chance to photograph Small Red-eyed Damselfly Erythromma viridulum away from the water. A single male was present along the western path at the view point over-looking Far lake. This species usually roosts high up in the trees, another reason they are rarely seen away from water, this individual was around 10 foot above ground level. Common Blue Damselfly Enallagma cyathigerum and Blue-tailed Damselfly Ischnura elegans continue to be the most abundant species present, with recently emerged specimens of both species observed. A few Emerald Damselfly Lestes sponsa were also noted around Carp Lake. Migrant Hawker Aeshna mixta was the only large species noted, and also my first seen on site this year, with at least four observed. Surprisingly low numbers of Darters present, with only a single Common Darter Sympetrum striolatum found near the Dragonfly Ponds and a single Ruddy Darter Sympetrum sanguineum at Carp Lake.

Small Red-eyed Damselfly - Erythromma viridulumSmall Red-eyed Damselfly – Erythromma viridulum

Migrant Hawker - Aeshna mixtaMigrant Hawker – Aeshna mixta

Emerald Damselfly - Lestes sponsaEmerald Damselfly – Lestes sponsa

Common Blue Damselfly - Enallagma cyathigerumCommon Blue Damselfly – Enallagma cyathigerum

Blue-tailed Damselfly - Ischnura elegansBlue-tailed Damselfly – Ischnura elegans

Butterfly numbers also low with Common Blue Polyommatus icarus, Green-veined White Pieris napi, Large White Pieris brassicae, Meadow Brown Maniola jurtina, Red Admiral Vanessa atalanta and Speckled Wood Pararge aegeria noted. Silver Y Autographa gamma and Straw Dot Rivula sericealis the only moth species found.

Red Admiral - Vanessa atalantaRed Admiral – Vanessa atalanta

Common Blue - Polyommatus icarusCommon Blue – Polyommatus icarus

Beetle-wise, Alder Leaf Beetle Agelastica alni was present in a small aggregation at the view point overlooking Far Lake along the western path, with both adults and larvae found. This appears to be a species that has recently colonised East Yorkshire. Another pleasing find was a single Adonis’ Ladybird Hippodamia variegata along the Northern Path, a species that I didn’t record on the reserve last year. This single individual was however soon eclipsed by a further 50+ found on the Rosebay Willowherb adjacent to the Maize Field. They were accompanied by 7-spot Ladybird Coccinella septempunctata which probably numbered into the thousands, along with several hundred Harlequin Ladybird Harmonia axyridis. The latter two species included both adults and larvae. Amongst this large assemblage, a single 2-spot Ladybird Adalia bipunctata was found, along with a larvae of 14-spot Ladybird Propylea quattuordecimpunctata. A few 22-spot Ladybird Psyllobora vigintiduopunctata were also noted at other locations around the site.

Alder Leaf Beetle - Agelastica alniAlder Leaf Beetle – Agelastica alni

Alder Leaf Beetle - Agelastica alniAlder Leaf Beetle – Agelastica alni

Adonis' Ladybird - Hippodamia variegataAdonis’ Ladybird – Hippodamia variegata

Harlequin Ladybird - Harmonia axyridisHarlequin Ladybird – Harmonia axyridis

Harlequin Ladybird - Harmonia axyridis and 7-spot Ladybird - Coccinella septempunctataHarlequin Ladybird – Harmonia axyridis (left) and 7-spot Ladybird – Coccinella septempunctata (right)

7-spot Ladybird - Coccinella septempunctata7-spot Ladybird – Coccinella septempunctata

2-spot Ladybird - Adalia bipunctata2-spot Ladybird – Adalia bipunctata

22-spot Ladybird - Psyllobora vigintiduopunctata22-spot Ladybird – Psyllobora vigintiduopunctata

14-spot Ladybird - Propylea quattuordecimpunctata14-spot Ladybird – Propylea quattuordecimpunctata

A new hoverfly species found was what appears to be a Eumerus sp, difficult to separate to species without detailed examination. Other species noted included Marmalade Hoverfly Episyrphus balteatus, Eristalis tenax, Eupeodes sp, Helophilus hybridus, Scaeva pyrastri, Sphaerophoria sp. and Syritta pipiens. The only other Diptera recorded was Coremacera marginata, love the wing patterns of this striking species.

Eumerus sp.Eumerus sp.

Syritta pipiensSyritta pipiens

EupeodesEupeodes sp.

Helophilus hybridusMale Helophilus hybridus

Helophilus hybridusFemale Helophilus hybridus

Eristalis tenaxEristalis tenax

Coremacera marginataCoremacera marginata

Other miscellany included a new Sawfly species Turnip Sawfly Athalia rosae, a tricky group to deal with, this being one of the easier species to identify. Field Grasshopper Chorthippus brunneus and Lesser Marsh Grasshopper Chorthippus albomarginatus also present, the latter species present in good numbers along the Northern Path.

Turnip Sawfly - Athalia rosaeTurnip Sawfly – Athalia rosae

Lesser Marsh Grasshopper - Chorthippus albomarginatusLesser Marsh Grasshopper – Chorthippus albomarginatus

Field Grasshopper - Chorthippus brunneusField Grasshopper – Chorthippus brunneus

Finally two Roe Deer Capreolus capreolus were in North Field, whilst a Rabbit Oryctolagus cuniculus appeared more concerned by the potential presence of a Stoat Mustela erminea in the undergrowth, than my presence only a few feet away.

Rabbit - Oryctolagus cuniculusRabbit – Oryctolagus cuniculus

Beetles (7)
14-spot Ladybird – Propylea quattuordecimpunctata
22-spot Ladybird – Psyllobora vigintiduopunctata
2-spot Ladybird – Adalia bipunctata
7-spot Ladybird – Coccinella septempunctata
Adonis’ Ladybird – Hippodamia variegata
Alder Leaf Beetle – Agelastica alni
Harlequin Ladybird – Harmonia axyridis

Butterflies (6)
Common Blue – Polyommatus icarus
Green-veined White – Pieris napi
Large White – Pieris brassicae
Meadow Brown – Maniola jurtina
Red Admiral – Vanessa atalanta
Speckled Wood – Pararge aegeria

Dragonflies (7)
Blue-tailed Damselfly – Ischnura elegans
Common Blue Damselfly – Enallagma cyathigerum
Common Darter – Sympetrum striolatum
Emerald Damselfly – Lestes sponsa
Migrant Hawker – Aeshna mixta
Ruddy Darter – Sympetrum sanguineum
Small Red-eyed Damselfly – Erythromma viridulum

Bees (2)
Common Carder Bee – Bombus pascuorum
Large Red-tailed Bumblebee – Bombus lapidarius

Sawflies (1)
Athalia rosae

Moths (2)
Silver Y – Autographa gamma
Straw Dot – Rivula sericealis

Grasshoppers (2)
Field Grasshopper – Chorthippus brunneus
Lesser Marsh Grasshopper – Chorthippus albomarginatus

True Bugs (1)
Cuckoo-Spit Insect – Philaenus spumarius

Flies (1)
Coremacera marginata

Hoverflies (8)
Marmalade Hoverfly – Episyrphus balteatus
Eristalis tenax
Eumerus sp.
Eupeodes sp.
Helophilus hybridus
Scaeva pyrastri
Syritta pipiens

Mammals (2)
European Rabbit – Oryctolagus cuniculus
Roe Deer – Capreolus capreolus