Trumpington Meadows
Trumpington Meadows. The 2012 CNHS study area centres on the area that will become Trumpington Meadows Country Park. We will record in monads TL4254, 4354, 4454, 4253, 4353, 4453, 4252 and 4352. The area includes arable fields, water meadows, the River Cam, road verges, tracks, Byron's Pool LNR, coprolite pits and a relict section of old railway. Few Cambridgeshire rare plants have been recorded from the area, though in the last 50 years or so Cornflower Centaurea cyanus, Sharp-leaved Rush Juncus acutiflorus, Changing Forget-me-not Myosotis discolor and Cut-leaved Self-heal Prunella laciniata have been seen. New additions (excluding many sown species) include Small-flowered Fumitory Fumaria parviflora (VU), Prickly Poppy Papaver argemone (VU).
The meeting points were A) The pond at Trumpington Park and Ride TL44075415, B) The bridge at Hauxton Mill (meet on west side of A10) TL43135272, C) Byron's Pool LNR car park TL43825483; at 2pm unless noted otherwise. The plan for the Park is shown on this map.
Visits will be subject to weather considerations, and they may be cancelled in the event of heavy rain or snow cover.
TL4253 - A few small meanders of the Cam come within the square.
TL4254 - A small plantation and some water meadow lies within the square.
TL4352 - A small area at the south end of the Country Park, which is part arable and part water meadow lies within the square
TL4353 - A large part of the site, including arable fields, water meadows, the River Cam, road verges, tracks, and Coprolite Pits are included.
TL4354 - The other major square, which includes arable fields, water meadows, the River Cam, tracks, Byron's Pool LNR and a relict section of old railway.
TL4453 - A small section with arable field and road verge.
TL4454
- The major area of the development (which we won't be visiting), some bits of
the Park, and the Park & Ride.
Diary
2012 March 25. The great drought continued,
and although the morning started with fog and low cloud, this soon burnt off to
give a warm spring day. Jonathan and Richard had a wander round the
northern part of the site in the morning, finding some white flowered Red
Dead-nettle Lamium purpureum, but otherwise little that wasn't seen in
the afternoon. The main party assembled by the pond at the Trumpington
Road P&R, aided by a helpful security guard who used the surveillance
cameras to advise those who weren't certain where the congregation was. We
progressed slowly along the verge, pointing out some of the difference between
the small white flowered plants of Whitlow Grass Erophila verna,
Shepherd's Purse Capsella bursa-pastoris and Bittercress Cardamine
hirsuta. Moving on to the central entrance track we found a host of
arable weeds with one plant that we couldn't identify and many ladybirds,
finding the common 7-spot, and also a handful of Adonis and a couple of
11-spot. Notable amongst the weeds was Henbit Lamium amplexicaule,
which was doing well on much of the previously arable ground. At this
point our habitually late arrival joined us, and a little later another member
who hadn't managed to put his clock forward. We continued along the track
and over the motorway to view the coprolite pits, though nothing unusual was
showing on the relict chalky banks. Further on we walked along the river
to the new reed bed, finding Soft Rush Juncus effusus growing on the
peat. Jonathan thought he saw an amphibian in the ditch above the reed
bed, but it wouldn't show itself for identification. We had a look for
Otter under the motorway bridge, and also noted that Mink control was in
operation. Returning towards the starting point we were delighted to see
mad March Hares indulging in a spot of boxing on the open fields.
Altogether we noted over 100 plant species, over 20 birds, and a few
invertebrates and bryophytes.
2012 April 22. April lived up to its reputation, and the string of
showers continued. Although the morning was mostly dry, showers began as
forecast at 1pm, and towards the end of the walk we had a thunderstorm with
hail. Jonathan Shanklin carried out a morning reconnaissance, with the
highlight being the finding of three orchid species along a section of
ditch. The party met at the Byron's Pool LNR car park, and progressed
towards the old railway, noting the variety of plants sown in the wildflower
meadow along the way. We found several concentrations of 7-spot ladybirds,
but didn't see any of the less frequent species. Some Alder trees growing
along the river bank gave cause for comment, as their leaf shape didn't match
that expected for the common Alder Alnus glutinosa. At the old
railway, Alan Leslie confirmed that an odd looking meadow-grass was Poa
infirma. Management work had been done in the nearby meadow to allow Adder's-tongue
Fern Ophioglossum vulgatum to thrive, and we were delighted to find a few
tongues beginning to emerge from their green hoods. The party then crossed
the motorway to look at the coprolite pits, however as we crossed the bridge the
rain increased and thunder rolled out. We pressed on! The pits have
become a little overgrown, but still support a margin of chalk grassland
plants. Glaucus Sedge Carex flacca was in flower, and Bird's Foot
Trefoil was just starting to show signs of its "Eggs &
Bacon". By now it was beginning to get a bit miserable, so the party
headed back towards Byron's Pool.
2012 May 31. As an experiment this visit was offered as a two part
one - a mid afternoon visit to the area round Byron's Pool, and an evening visit
to the Hauxton end. Numbers were low for both, but did allow a different
set of visitors. During a gentle walk round Byron's Pool, explaining some
of the work that had been done and the management programme we made a couple of
interesting finds - a beautiful Latticed Heath moth near the meadow pond and
Aquilegia in the wood - a first record for the site. Rain had been
predicted, and a little started soon after this leg, as I wandered around the
sown meadow area. Interestingly parts had been ploughed, and I saw a few
plants of small Toadflax in the open areas. Around the new drain and
balancing pond there was further open ground, and here there was a lot of Venus
Looking Glass and an area of Small Flowered Fumitory. Elsewhere arable
weeds had been sown and there are places to see Cornflower, Corn Marigold, Corn
Cockle, Corn Buttercup and others. Checking these interesting parts took
longer than expected and I had to eat tea on the move to get to the appointed
evening meeting place in time. We started with an introduction to grasses,
as many species were coming into flower and triggering hay-fever.
Continuing round the river we found a planted Sugar Maple Acer Saccharinum,
with a few galls of the mite Vasates quadripedes, first reported in
London as recently as 2002, on its leaves. Finding a ditch blocking our
path round I suggested jumping it as we all had wellies on. I made a clear
jump, Willa needed a helping hand, but our third member, darkly prophesying that
he would get his feet wet duly landed in the middle of the ditch. Nothing
daunted we continued round, looking at the new reed bed, then continuing towards
the coprolite pits. Here we found many drowsy damselflies, which obliging
allowed close inspection to determine that they were the Azure Damselfly.
We also saw a pair of Muntjac, which on spotting us headed towards the cover of
the field of oil-seed rape.
2012 June 27. As part of National Invertebrate Week, the Wednesday
volunteer group spent the day at Trumpington Meadows and began by inspecting a
box of moths that had been trapped by the county moth recorder overnight.
It included many large hawk moths, several brightly coloured moths and a few
rarities. Armed with sweep-nets, pooters and pots the volunteers wandered
around seeing what they could catch. Finds included an orange ladybird,
damselflies, spotted craneflies, spiders (most of which were not identified!), a
leopard slug and many others. Afterwards Jonathan wandered round parts of
the site that would not be visited the next day, find Grass vetchling Lathyrus
nissolia, Short-styled field rose Rosa stylosa and Medic Medicago
sativa.
2012 June 28. The CNHS visit started at the pond at the P&R,
which proved to have an unexpected variety of introduced species such as Bogbean
Menyanthes trifolia at its margins, and one alien invader, Floating
Water-pennywort Hydrocotyle ranunculoides. After much persuasion the party
moved on towards the main entrance to the Trumpington Meadows site, where a host
of wildflowers had been sown. A surprise addition to the list was a big
area of Night-flowering Catchfly Silene noctiflora, which according the
Wildlife Trust was not supposed to be a component of the seed-mix, as well as
Thorrowax Bupleurium obovatum, which most likely was a contaminant.
As there was much else to see, Jonathan tried to get the party moving towards
other areas, but despite striding off purposefully some lagged behind. The
next area to look at was the new ditch, to see the native arable weeds, then on
to the old railway to see Toadflax Linaria vulgaris. From here we
wandered round the balancing pond, and then towards the spoil mountain.
Unfortunately there wasn't time to see the coprolite pits, so we headed back and
reached the gate towards sunset. The Catchfly lived up to its name, with
most plants now showing their rosy white petals in full flower.
2012 July 19. The Met Office forecast of a dry evening put most
people off. As expected there were heavy showers until 5pm, and then some
light rain during the visit, which was generally a damp one. Jonathan and
Monica had a wander round the sown meadows and coprolite pits. Just over
50 botanical records were made, none exceptional, with perhaps the most
unexpected being Marsh Woundwort Stachys palustris being found in a
former arable area, though it is sometimes a crop weed. We admired a
rather handsome Black Slug Arion ater, and also some rather soporific
damselflies. Sadly the nice chalk grassland strip along the coprolite pits
had been trashed by a severe mow and leave followed by tractor trampling.
Midges and mosquitoes started biting as sunset approached, but recording
continued until shortly after sunset.
2012 August 16. Our final evening visit was dry, though generally
overcast, breezy and humid. The wind was too much for the butterflies and
dragonflies that we hoped to see, so instead we looked for plant galls, in
addition to searching for additions to the plant species list. Many
of the young Hawthorns in the recently planted hedge were suffering from
mildew. A young Oak tree in the hedge did well, with three
galls, the familiar Marble Gall caused by Andricus kollari, the less
familiar Knopper Gall caused by Andricus
quercusramuli and the Silk Button Spangle Gall caused by Neuroterus
numismalis as well as a rust. A rose gave us the Robin's
Pincushion Gall Diplolepis
rosae and the Smooth Pea Gall caused by a Diplolepis sp, which lived
up to the description of being easily detachable.
2012 September 23. With weather forecasts having predicted the
arrival of the remains of a tropical storm all week, prospects for the visit did
not look good. The morning was dry, and Jonathan Shanklin carried out a reconnaissance,
finding the liverwort Aneura pinguis by the P&R pond, and adding
several plants to the vascular list. His forecast the day before that the
rain would arrive about 2pm proved only an hour out. It arrived at
1pm! With rain falling, the prospect of anyone turning up looked remote,
but Mark Powell arrived in his lichen covered van, followed a short while later
by Hilary Pounsett, and we started looking at the various lichens on the kerb
and fencing by the P&R pond. Under Mark's guidance they proved to be
much more diverse than a quick glance would suggest, with around a dozen on the
kerb alone. An unknown metal loving lichen (no-one has found it fruiting
yet) covered many of the fence-post tops. With rain still falling,
Jonathan and Mark headed for the motorway bridge, finding a further selection,
but after a very short dry interlude, rain continued and they return via
Shepherd's Cottage. Here lichens coated concrete baulks, some outlining
where material had been depoted, and in the old garden Xanthoria parietina
covered Lilac twigs. With the deluge continuing further investigation was postponed
for a better day. Mark has provided a full report on the lichens.
2012 October 21. There had been heavy rain the night before, and
the day was damp and overcast, however the rain did not return until just as the
visit was finishing. The first fungi, and a myxomycyte, were growing on a
log by the cycle stands at Byrons Pool LNR. A quick look at the meadow found
only a solitary Yellow Fieldcap Bolbitius vitellinus, but then under the
hedge Wood Blewett Lepista nuda and several other fungi were
spotted. We moved into the wood and progress slowed as there were so many
fungi to see. Mark Powell, who had joined us, was also inspecting trees
for lichens and was very pleased to find Enterographa
crassa, an indicator of ecological
continuity that is quite rare in Cambridgeshire. There were happy cries as
participants encountered new species, but perhaps the star find was the Arched
Earthstar Geastrum fornicatum. After lunch we proceeded slightly
more quickly to the end of the LNR and out onto Trumpington Meadows. There
was nothing to be seen on the recently cut damp meadow, nor on the old railway,
but we did better on some piles of cut willow. We crossed under the
motorway and along the motorway embankment a little while before crossing to the
river. There were a few fungi around the old PBI boat-shed, but apart
from a tiny fungus on a pine trunk we didn't see much of interest. The
coprolite pits were similarly sparse, but near Shepherd's Cottage Helene found
Garland Roundhead Stropharia coronilla and Smokey Roundhead Stropharia
inuncta on grassland at the field margin. From here we headed back
to Byron's Pool and along the river back to the car-park, where we met up with a
very late David Seily.
2012
November 25. Our final visit had the objective of recording bryophytes, and overnight
rain which had cleared by the time we started, gave them good conditions. The Cam
was very high, with water levels either side of the Byron's Pool weir only some 20cm
different. It was a sunny morning, but with a rather biting wind. We started
with an early blitz of Trumpington churchyard, which provided a nice introduction to some
of the common lawn mosses, along with the churchyard wall topped by cushions of Grimmia
pulvinata and Schistidium
crassipilum. Orthotrichum
cupulatum on a monument and Didymodon
nicholsonii and Tortula
protobryoides on paths were new for the churchyard. At Byron's Pool LNR a few
more participants joined us, and we started with a look at the pond in the meadow.
Hopes for its chalky bank to have lots of interesting species were dashed with Barbula
unguiculata being dominant, but there were also a few stems of Aloina
aloides. Accessing trees along the high river required wellies, but Mark Hill
was not put off, finding copious Leskea
polycarpa and Syntrichia
latifolia on several waterlogged trees, as well as Hennediella
macrophylla on the clay bank. H.
macrophylla is an introduced species which is slowly spreading; it was
previously known from the Cam only by the Backs and at Little Abingdon. On one
rather more accessible tree, Richard Fisk noted two liverworts Frullania
dilatata and Metzgeria
furcata, the only two that we saw in the Trumpington Meadows area. We then
moved across to one of the new ditches along the old railway line finding a good range of
pioneer and ruderal species, including plentiful Tortula
protobryoides. We had lunch in the sunshine on the railway track shielded by
trees from the worst of the wind. From here we continued round the river to an area
which had been cleared down to the chalky clay, which again provided plenty of pioneer
species. The bridge over the M11 had acquired several species, including
"Car-park moss" Brachythecium
mildeanum. The old coprolite pits had rather too much scrub for any interest,
but Richard Fisk found some delightfully small-sized Fissidens
viridulus by a rabbit hole. With the sun getting low we headed back along the
track, briefly inspecting the scrubby area near the motorway before returning along the
main track towards Byron's Pool car park.