With the NNR Base Garden now in its second year, this summer saw it really start to produce the
goods, particularly in terms of butterflies with (as it stands) 2078 butterfly
records gathered just from the garden. Several species of dragonflies were also
seen visiting our base pond and new hoverfly species frequented the flowers,
whilst the moth trap caught several ‘firsts’ for the reserve.
Only a few years back in 2010 work was started on the new
reserve base for the Lower Derwent Valley NNR, with the official opening on
World Wetlands day (2nd February) 2011. Obviously sensitive to the
local landscape and planning issues, Natural England wanted to deliver a
building that, as well as acting as an NNR office and base, demonstrated best
green build practice and one that brought additional environmental
benefits. As well as several other
‘green features’, the base has a green living roof, planted with sedum and various grasses. Viewed from above by the thousands of returning waterfowl which descend from the high Arctic each winter, it blends the building into
the surrounding landscape making it virtually invisible to them. Local
groups were also involved in helping us design, plant and manage the building
and gardens, making and erecting bird boxes, creating flower rich hay meadows
and planting a sensory bee and butterfly garden.
BTCV making bird boxes
The garden was planted with butterflies and bees in mind
with species such as Lavender, Buddleia, Devil’s-bit and Field Scabious, Water
and Corn Mint, Teasel and Hemp Agrimony. The idea was to try and
produce a range of good nectar sources for butterflies and bees throughout the
season (June – September).
This year 23 butterfly species were recorded in the whole of the LDV,
with 18 of those seen in the NNR Base Garden: Small White, Large White, Green-veined
White, Orange Tip, Comma, Peacock, Small Tortoiseshell, Red Admiral, Painted
Lady, Wall Brown, Ringlet, Meadow Brown, Small Skipper, Large Skipper, Small
Copper, Gatekeeper, Speckled Wood and Marbled White.
Peacock (Inachis io)
Red Admiral (Vanessa atalanta)
Small Tortoiseshell (Aglais urticae)
The meadow was also sown to ensure a range of early hay meadow species were out before the garden plants came into flower, such as Buttercup, Red Campion, Sneezewort, Ox-eye Daisy, Ragged Robin, Knapweed and Wild Carrot.
Ragged Robin (Lychnis flos-cuculi)
It was also decided to keep certain weeds in the adjacent
field until after they flowered, such as thistles which this year the Whites in
particular made good work of. Nettles and docks were also left as refuges for
egg laying and caterpillar food.
Green-veined White (Artogeia napi)
Hoverflies particularly favoured the Fleabane and Scabious,
with the nearby Bramble in the hedgerow also pulling in good numbers and a
variety of species. Over 26 species of hoverfly have been recorded in the LDV
this year, with many of these seen in the NNR Base Garden, species such as Helophilus trivittatus/pendulus were seen in abundance along with many of the Eristalis sp.
Helophilus trivittatus
Episyrphus balteatus
Syrphus sp.
Sphaerophoria scripta
Several species of bee were seen daily, particularly on the Lavender. Buff-tailed, White-tailed, Red-tailed, Common Carder, Garden and Early being the most frequent visitors.
Worker bee Bombus lucorum/terrestris
Early bumblebee (Bombus pratorum)
The small pond was built and stocked with a range of species from the NNR – Purple Loosestrife, Water and Corn Mint, Yellow Flag Iris, Round-leaved Pondweed, Sneezewort, Water Plantain and Great Water Parsnip – again to provide a natural range of Ings marginal water plants for a number of inverts especially dragonflies. A number of dragonflies have been seen on the small pond with species such as Broad-bodied Chaser, Brown Hawker, Ruddy Darter and Common Darter seen regularly.
Broad-bodied Chaser (Libellula depressa)
The feeding station which was built in February this year saw plenty of activity as winter came to a close. The feeders were left empty throughout the breeding season but last month in preparation for the winter the feeding station was set up again and has seen a lot of activity already. Tree Sparrows in particular have been making good use of it, along with Willow and Marsh Tits, Brambling, Chaffinches and a Great Spotted Woodpecker often comes down for the peanuts.
Bank Island feeding station
The NNR Base has also become home to several pairs of breeding Tree Sparrows which is especially pleasing for a species which is on the amber list.
Moth trapping in the NNR this year has produced
247 species, many of which were caught at Bank Island, including several firsts for the reserve: Red-sword Grass and Feathered Gothic. The ‘green’ roof has proved popular with a
number of wildlife species but one of the highlights has been the discovery of
a colony of the Yellow Belle Moth (Semiaspilates
ochrearia). This moth has only been recorded from Yorkshire twice before,
both as presumed wandering migrants at Spurn Point. It is very much a coastal
species found as far north as Lincolnshire although isolated colonies occur in
the Suffolk Brecklands, and it is from the latter isolated colonies that the
moth is thought to have come from, having been transported on the green roof to
the Lower Derwent Valley.
Yellow Belle Moth (Semiaspilates ochrearia)
Several Long-eared Bats and Pipistrelle Bats have also made the base their home, and artificial House Martin nests and Swift bricks have also been used - albeit by Wrens and Tree Sparrows - maybe next year!
For us whilst it is great to have a reserve base that is fit for purpose and that allows efficient delivery of the NNR management and additional outreach benefits, it is however also a real bonus and asset to Natural England to have a demonstration green build, complete with its new inhabitants, and one that adds to the experience of visitors coming to the NNR. To see how the garden has developed this year has been a rich reward for those involved with developing it, particularly for our volunteers that have helped plant it, weed it and survey the wildlife in it!
