1: Organiser, brc aquatic Heteroptera Recording Scheme 2: Organiser, brc terrestrial Heteroptera Recording Scheme




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SURVEY OF HETEROPTERA (TRUE BUGS) 2005
By Sheila Brooke1 & Bernard Nau2

1: Organiser, BRC Aquatic Heteroptera Recording Scheme

2: Organiser, BRC Terrestrial Heteroptera Recording Scheme

Two half-day visits were made, on 30th November 2004 and 22nd April 2005 respectively. The main objective was to record water-bugs (e.g. water-boatmen and skaters), these dates being outside the season for most terrestrial species. The fourteen species of water-bugs recorded were all fairly common species and the most productive sites for these were those with deeper water and rich vegetation. We used water nets to sample the water-bugs. On both visits we entered the site by the public footpath down Chadwell Bank.


On the November visit we first examined the two lagoons below the Bank. We worked along the water margin each side of the causeway between the lagoons, for about 100m, and then along the south shore of the more productive west lagoon. The east lagoon was too shallow to be suitable for most water bugs, and the waterfowl and waders would probably have predated any that had been present. The slightly deeper water in the western lagoon provided a more suitable habitat, although the water bugs here too were rather sparse - almost confined to the cover provided by emergent tussocks of rushes (Juncus sp.).
We next moved on to examine the pools in depressions just west of the viaduct, here encroaching flote-grass (Glyceria fluitans, s.l.) provided better cover and water-bugs were more numerous and more diverse.
Proceeding northwards we checked the New River and the western section of the Manifold Ditch. In the New River one species of water-boatman was quite common where grass from the bank hung into the water. On neither visit did we see any of the very large gregarious skater Aquarius naias, although we checked carefully for it. There are colonies of this bug on the water in the vicinity of many bridges along the New River, one long-known colony is at Great Amwell.
The day of the April visit turned out to be warm and sunny, bringing out exceptional numbers of over-wintered terrestrial bugs. We therefore took advantage of this opportunity and devoted most of our time to recording these rather than water-bugs. In particular, shieldbugs were ‘sunbathing’ on leaves of plants in sheltered places, especially along the northeast fringes of the Meads. They were in unusual numbers and diversity, twelve species were recorded, including one or two ‘shieldbug allies’. In particular, it was unusual to see the metallic blue shieldbug Zicrona caerulea in ‘plurality’ - it is usually seen in odd ones and twos. On this occasion the bugs were on young plants of hairy willowherb (Epilobium hirsutum), alongside the matching, metallic-blue flea-beetle (Haltica lythri) that is believed to be the main prey of this bug. Another attractive shieldbug recorded, Eurydema oleracea, is a species of crucifers, it is usually dark green with cream or reddish spots. It is a recent coloniser of Hertfordshire and was seen here in double-figure numbers on flowering crucifers, such as Jack-by-the-hedge (Alliaria petiolatum).
A small damp copse on the edge of the reserve was visited, this has some large logs among the nettles. We checked under loose bark on these for bark-bugs (Aradidae) but none were found.
The hard-surfaced footpath/cycleway just south of the R. Lee was very rewarding. It is surfaced with small loose limestone chippings and there were a few stunted ‘weeds’ colonising the edges of the path. Here, in a sunny sheltered area we found a southern species of seed-bug (Lygaeidae) new to Hertfordshire, this is Raglius alboacuminatus. The first one (perhaps two) were on a pile of twigs on the verge beside the path, a further half dozen were scattered along the path itself, among the sparsely colonising plants at the margins, perhaps feeding on seeds fallen from these. Females of the pied shieldbug (Sehirus bicolor) were also frequent here, pushing their way under loose stones, probably to oviposit there. The foodplants of this species are labiates such as red dead-nettle, which was growing on the margins of the path.

p.1 Heteroptera No.of records: B.S.Nau § = RDB species Vouch/Gen



40 4/1/06

Cymatia bonsdorffii 30/11/04 The Meads WT NR Herts

- - CBLW: f



Callicorixa praeusta .. . .

- - NR: f



Corixa panzeri .. . .

- - CBLW: 3f+m, aFC



.. .. . .

- - VPS: 3a



Corixa punctata .. . .

- - CBLW: f



Hesperocorixa sahlbergi .. . .

- - VPN: m



Sigara nigrolineata .. . .

Ö - MDW: f (coll SB)



Sigara limitata .. . .

- - VPN: f



Sigara dorsalis 22/4/05 The Meads WT NR . .

- - NR: a FC in marginal grass hanging in water



.. 30/11/04 The Meads WT NR . .

- - CBLW: 2f+m, aFC



.. .. . .

- - VPN: f



.. .. . .

- - NR: f>>m, a C in o/h grass



Sigara distincta .. . .

- - CBLW: (f)



Sigara falleni .. . .

Ö - CBLW: 2f+2m



.. .. . .

Ö - NR: f+m



Sigara lateralis .. . .

- - CBLW: f



.. .. . .

- - VPN: f LFC



.. .. . .

Ö - NR: f+m



Ilyocoris cimicoides .. . .

- - VPS: 'm'



Notonecta glauca .. . .

- - VPS: a FC



.. .. . .

- - MDW: a FC



Notonecta viridis .. . .

- - VPS: a



Nabis rugosus 22/4/05 The Meads WT NR . .

- - RLSB: 3a verge of path



Drymus sylvaticus .. . .

Ö - RLSB: m+f



Scolopostethus affinis .. . .

Ö - RLSB: f



§ Raglius alboacuminatus .. . .

Ö - RLSB: 7a: 1 on twig pile, rest on path



Coreus marginatus .. . .

- - PNR: LFC in copse & field edge, 20 in one



Rhopalus subrufus .. . .

- - RLSB: 9a path verge,on lvs in sun

p.2 Heteroptera No.of records: B.S.Nau § = RDB species Vouch/Gen

4/1/06


Legnotus limbosus .. . .

- - RLSB: a, among loose limestone chips on



Sehirus bicolor .. . .

- - RB: 2a, Lamium album



.. .. . .

- - RLSB: m&f LVC in hot sun: 50+, path verge



Aelia acuminata .. . .

- - RLSB: 4a swept, grasses



Dolycoris baccarum .. . .

- - RLSB: a dead grass, a F ('red') Nettle lvs in



Eysarcoris fabricii .. . .

- - RLSB: a Lamium album, a nearby



Palomena prasina .. . .

- - PNR: 13 a + 2p on lvs of Nettle



.. .. . .

- - RLSB: a 100+, Nettle along hedgerow



Eurydema oleracea .. . .

- - PNR: 1p+10a (both red & white spot forms)



Zicrona caerulea .. . .

- - PNR: 5a (m&f) on lvs of Epilobium, near



Acanthosoma haemorrhoidale .. . .

- - RLSB: a Nettle leaf in sun



Elasmostethus interstinctus .. . .

- - PNR: a Nettle leaf in copse


SITE Code

Vice-county:

Notes

Sub-sites Photo

TL31TMNR


The Meads WT NR

020 Herts

Water meadows below A10viaduct, from R.Lea S to

Chadwell Bank. Part Hertford, part Ware.



CBLE Chadwell Bank Lagoon E TL348137

Shallow lagoon, W of New River 'basin'



CBLW Chadwell Bank LagoonW TL34901368

Bordering viaduct



MDW Manifold DitchW TL34381407

Water-mdw feeder from R.Lea, W of viaduct. Extensive Glyceria

max., Hottonia, (grazed) Veronica.

NR New River TL34491375

PNR Pasture N of rly TL35211418

Crossed by public footpath from Chadwell; includes copse at NW

corner.

RB Railway bank

RL River Lea TL345141

RLSB R.Lea, S bank TL35211420

Riverbank, S to NR boundary



VPN Viaduct Pool N TL34501365

Deep flood-pool, beside rly



VPS Viaduct pools S TL34661365

Shallow grassy flood pools - Glyceria flu. dominant



Abbr. Meaning

? uncertain

(tick sign] present

! Genitalia checked

': ' 'letters+colon+space' in Record 'Notes' field denotes a subsite, identified in Subsite file

1st..5th instar stage

A Abundant

a Adult


A1 Antennal segment no.1

agg aggregated spp

bk black

bn brown


brach Brachypterous adult (short winged)

C common & widespread

C+ very common & widespread

ca Circa


CWD Chinese Water Deer

dis. rly former railway track

dk dark

esp. especially



F Few

f Female


FC Fairly common

fl flower(s)

fp Footpath

gn green


i immature (=nymph)

Imp Imported species

Inst Instar(larva)

L Local


L+ local, well-established in suitable areas

lf leaf


lt light

m Male


mac Macropterous adult

micr Micropterous adult (residual wings)

Mig Occasional migrant

n Nymph


NA Red data status: Notable - scarcer

Nat Naturalised

NB Red data status: Notable - less scarce (<100x10km sq)

NNR National Nature Reserve

NR Nature Reserve

NT National Trust

p mating pair

plantn Plantation

Q Quarry

R Rare in Beds.

R1 Red data status: Nationally Endangered - in immediate danger of extinction

R2 Red data status:Nationally vulnerable - likely to become endangered in near future

R3 Red data status: Nationally rare - at risk, localised or thinly distributed (15 x10km sq)

Rhodo Rhododendron

RK Red data status:uncertain

S widely but thinly scattered

S+ widely scattered, moderately common

Syc. Sycamore

Syn synanthropic,

Abbr. Meaning

t Teneral adult

U uncommon

u/ under


V vagrant, not established in Britain.

VA Very abundant

vac Vacuum sampler

VC Very common

X Red data status: Extinct

[…] initials of collector



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