The Mandarins of Kent

Much has been said about the damaging impacts of non-native species in the British Isles, and this publicity has been largely negative, from Canada Geese causing eutrophication of lakes with their droppings, to invasions of Japanese Knotweed and Giant Hogweed. The potential ecological risks posed by the now-familiar Ring Necked Parakeet (Psittacula krameri), noisy, shy and gorgeous, is currently However, it is worth approaching any conversation about invasive species with a degree of caution, as many species are now long-established in Britain, including the charismatic and declining Little Owl (Athene noctua), friend of farmers and nemesis of a range of agricultural pests, and the stunningly beautiful Mandarin Duck (Aix galericulata) and do not have any appreciable negative impacts.

Mandarins at Keston Ponds, Greater London. Note the enormous carp in the foreground, which scared the apparently previously oblivious ducks skyward a second later!

 

The Mandarin Duck originates from far Eastern Asia, occurring in Eastern Russia,  Japan, and most notably China. It was relentlessly collected in the latter and exported to ponds all over the World, all the while suffering reductions in its unique habitat, and is now a relatively scarce bird there, although newly discovered wild populations have bolstered its conservation status. Among the birds torn from their natural habit, were small numbers brought to ornamental lakes in Britain. They were first recorded breeding wild in the UK in London in 1946, although breeding populations were probably established much earlier.  They are now found at a small number of sites, largely concentrated in South Eastern England, although a few individuals occur at Mere Sands Wood, a wonderful woodland and wetland reserve somewhere between Preston and Liverpool, and managed by Lancashire Wildlife Trust.  Prior to the discovery of new populations in China, the British population of Mandarins in the 1990s was thought to exceed that in its native range, although in reality it may represent  10-20% of it (LNHS 2002).  This non-native population remains, far from a parochial conservation threat, a global conservation asset. Their UK strongholds are in Greater London, Berkshire and Surrey.

Among the abandoned bread. Bread is not good for birds, and incidentally, Keston Ponds was covered in floating bits of it. Please, if you can refrain from bread-throwing without upsetting yourself or your kids, do so.

Mandarin Ducks have been under-recorded in the UK due to their secretive, tree-nesting habits. Unusually for the typically chauvinistic duck family, males and females share the incubation of the eggs. Perhaps as hole nesters the male’s incredibly bold plumage represents less of a liability in terms of predation risk. The males have distinctive orange feathers on their faces, red bills, and large, orange sail-like plumage on their backs. Electric blue flashes can be seen on their backs and flanks.  While the female is less gaudy, smart in a uniform grey-brown with white underside markings and a white stripe around her big, dark eyes, she may command the prize for cutest-looking female duck, perhaps competing with the scarce, and also introduced, Carolina Wood Duck from the USA.

The rather lovely couple.

I had the good fortune to spend a couple of happy hours hanging around with the charming Mandarin Duck at Keston Ponds, in greater London, near the town of Orpington, where they live alongside the native Tufted Duck and Mallard.  They would take bread thrown to them off the water’s surface but always remained warier than the Mallards or Geese, sticking a few metres from the nearest human, of which, on a sunny day, a green oasis in metropolitan Kent attracts many.  Here they find the small, wood-fringed pools they favour in their native range, and old trees in which to nest.  They suit the place well, it represents their habitat, a similar climate to their native range, and hardly seem out of place, especially as green parakeets from Himalayan India fly squawking overhead.  Mandarin Ducks seem to me a very welcome addition to our fauna, exotic, beautiful, and here to stay.

The Mandarin Duck's habitat at Keston Ponds.

Male Mandarin Duck.

 

Turnstones

Just a very brief blog post to enthuse about Turnstones. You have probably seen them, in the winter, brown, unassuming and very confiding little birds, often happily tucking in to left-over fishing bait on wind and rain soaked piers, which sea anglers are often happy to provide. They can also be found on the beach, turning over stones as the name suggests, hunting for invertebrates and whatever has been washed up by the sea.

Arenaria interpres, seaside ghoul and fisherman's companion.

These angler’s companions tastes are not limited to fishing bait, and are not always so benign, historically they have been recorded feeding on the remains of deceased seafarers who became washed up on beaches. They need to retain cosmopolitan tastes, however, to survive in the harsh environments in which they spend the winter, and resourcefully will dine on almost anything it can find on the strandline, from small crustacea and shellfish to decomposing cetacea.  Birds which winter in Britain can come from as far afield as Greenland and Canada, as well as Scandinavia, and the winter can find them all around the British coast, though summer is short in many of their breeding areas, meaning in reality they can be found for most of the year, birds arriving in August and typically remaining until May. Small numbers of non-breeding individuals, resplendent nevertheless in the plumage that gives Arenaria interpres its international common name, Ruddy Turnstone.

handsome and summery looking Turnstone, Herne Bay, Kent, 6th May 2014

It is not clear whether this little crowd of Turnstone, found on a gorgeous day in May during a trip to the seaside at Herne Bay, in Kent, represents a non-breeding flock, indeed many of the individuals appear to retain juvenile plumage, or just some stragglers getting ready to head back to some remote, sub-arctic or arctic rock for their brief and frantic breeding season.   They balanced unassumingly cute and splendid very convincingly, especially those which had moulted into their summer plumage, and were confiding enough to permit photography. Indeed, they were so charming, they warranted their own blog post.

Turnstone, Herne Bay, May 2014

Turnstone in non-breeding plumage, Herne Bay, May 2014