Skaters on a garden pond

April 14th 2015

Skaters on a garden pond

On 10th April 2015, I had a quick look at the small garden pond belonging to our neighbours, John and Emily Ross, at Nedd (NC1331), which earlier in the year contained at least 50 clumps of frogspawn. There were tadpoles in plenty, but also a lively raft of pond skaters Gerris sp. The identification of these water bugs requires close examination, so I collected one.

It proved to be a moorland pondskater Gerris costai, typically found on small moorland pools. The photographs are of what I take to be males; the females are darker and larger (up to 13mm). Adults hibernate on land and then, in the spring, fly to suitable water bodies to find mates. They prey on insects trapped on the surface of the water, grasping them with their front pair of legs, whilst the middle pair are deployed as oars and the hind pair as trailing rudders. A dense coat of water-repellent hairs covers the whole of their bodies, apart from the ends of their legs, which dimple the surface film.

The moorland pondskater is found right across the Highlands, but this may be the first record from Assynt.

Ian Evans

Moorland pondskater Gerris costai Nedd. Photo I. Evans
Moorland pondskater Gerris costai Nedd. Photo I. Evans
Moorland pondskater Gerris costai Nedd. Photo I. Evans
Moorland pondskater Gerris costai Nedd. Photo I. Evans

Report a Sighting

Recent Sightings

Shelduck

Two adult birds and nine juveniles off Culkein Drumbeg (DAH). Sadly a very rare record now for Assynt, but great to know we had at least one breeding pair this year. (25/07)

House Martin

15+ birds around Culkein Drumbeg jetty (DAH) and large number also around Culag Hotel, Lochinver. (Andrew Mackenzie) Both records late evening. (25/07)

Common Lizard

Single animal, Clashmore (Andrew Mackenzie) (25/07)

Red-throated Diver

Two birds, Bay of Stoer (DAH) (24/07)

Common Dolphin

15+ very active animals just off Sgeir Mhòr, Loch Kirkaig (DAH) (24/07)

Black-throated Diver

Six birds in a group, Loch Kirkaig (DAH) (24/07)

Antler moth (Cerapteryx graminis)

Single moth in Strathan garden (Jean Macleod) (24/07)

Magpie moth (Abraxas grossulariata)

Single moth Clachtoll, (Dorell Pirie) (24/07)

Map