Butterfly Conservation
Hertfordshire and Middlesex Decad Mapping Progress 2006

TL41

Click on image for detailed map

TL41 ~ Click on image for detailed map
(please note this map is out of date)

Decad co-ordinator:

Link sections on this page . . .
Table One ~ Key Tetrads to be visited in 2008
Table Two ~ Species richness map
Table Three ~ Target species

This page was last updated on

Table One ~ Key tetrads to be visited
Table One now lists the target species for each specific 2km square for 2008, based on known recording. Purple Hairstreak, and Small & Essex Skipper are poorly recorded throughout the 10km square  - Liz Goodyear (March 2008)

Tetrad (2km square) Centered on Target species for 2008
TL4010 Hunsdon Meads Well recorded - Brimstone, Essex Skipper
TL4012 Hundonsbury Brimstone, Green-veined White, Holly Blue, Large White, Small Tortoiseshell
TL4014 Widford Railway line Brimstone, Orange Tip, Painted Lady, Peacock
TL4016 Nobland Green Brimstone, Holly Blue, Painted Lady,
TL4018 Kettle Green Holly Blue, Large Skipper, Painted Lady,
TL4210 Hunsdon Meads east/Eastwick Large Skipper, Painted Lady, Small Copper
TL4212 Eastwick Moat Large Skipper, Painted Lady
TL4214 Marshland Wood Holly Blue, Large White, Small Tortoiseshell
TL4216 Hadham Mill Common Blue
TL4218 Much Hadham Large Skipper, Painted Lady, Small Tortoiseshell
TL4410 Harlow Mill Brimstone, Green-veined White, Large White, Orange Tip, Small Tortoiseshell
TL4412 Gilston Essex Skipper, Holly Blue, Large Skipper, Small Skipper
TL4414 Great Penny's Farm Essex Skipper, Green-veined White, Holly Blue, Painted Lady, Small Skipper
TL4416 Allens Green Essex Skipper, Holly Blue, Painted Lady, Small Skipper
TL4418 Danesbridge Brimstone, Green-veined White
TL4612 Redericks Lane Holly Blue, Large White, Orange Tip
TL4614 High Wych, west Sawbridgeworth Large Skipper
TL4616 Trims Green Gatekeeper, Holly Blue, Large Skipper, Large White, Meadow Brown
TL4618 Thorley Park Well recorded - Purple Hairstreak
TL4812 Pishiobury Well recorded - Purple Hairstreak also Small Copper and Small Heath
TL4814 Sawbridgeworth Green-veined White
TL4816 Spellbrook Green-veined White, Holly Blue, Large Skipper, Large White, Orange Tip, Small Tortoiseshell
TL4818 Thorley Wash Large White
TL5014 east of Sawbridgeworth no details

Table Two ~ Species Richness Grid
Table Two is a 5 x 5 grid of the tetrads (2km squares) in TL41, and shows the species richness for each tetrad based on recording in 2005/2006 and 2007 based on known records. There are three transects in TL41.

Special richness grid for TL41

Table Three ~ Target Species - Latest update March 2008. Table Three indicates the distribution of species recorded in TL41 and the tetrads that need to be visited for specific species. NOTE: in 2005 no Small Heath were recorded in TL41 but 3 sites (5 confirmed 2007) have been found in 2006 after intensive survey work.
* = a record / 23 tetrads only
Species 4010 4012 4014 4016 4018 4210 4212 4214 4216 4218 4410 4412 4414 4416 4418 4612 4614 4616 4618 4812 4814 4816 4818 Total
Brimstone * * * * * * * * * * * * * * * * * 17
Brown Argus * * * * * * * * * * 10
Clouded Yellow * * * * * * * 7
Comma * * * * * * * * * * * * * * * * * * * * * * * 23
Common Blue * * * * * * * * * * 10
Essex Skipper * * * * * 5
Gatekeeper * * * * * * * * * * * * * * * * * * * * * 22
Green-veined White * * * * * * * * * * * * * * * * * 18
Holly Blue * * * * * * * * * * * * 13
Large Skipper * * * * * * * * * * * * * * 14
Large White * * * * * * * * * * * * * 14
Marbled White * 1
Meadow Brown * * * * * * * * * * * * * * * * * * * * * 22
Orange Tip * * * * * * * * * * * * * * * * * * * 19
Painted Lady * * * * * * * * * * * * * * * 15
Peacock * * * * * * * * * * * * * * * * * * * * * * 22
Purple Hairstreak * * 2
Red Admiral * * * * * * * * * * * * * * * * * * * * * * * 23
Ringlet * * * * * * * * * * * 11
Small Copper * * * * * * * * * * * * 12
Small Heath * * * * * 5
Small Skipper * * * * * * * 7
Small/Essex Skipper $ - * * - * * * - - - * - 6
Small Tortoiseshell * * * * * * * * * * * * * * * * * * 18
Small White * * * * * * * * * * * * * * * * * * * * * * * 23
Speckled Wood * * * * * * * * * * * * * * * * * * * * * * * 23
White-letter Hairstreak * * * * * * * * * * * * * * * * * * * * * * * 23
Total 21 15 13 20 14 17 14 14 21 17 11 20 14 17 18 16 17 12 25 20 19 13 17

$ only included if either Small or Essex Skipper have not been identified in a specific tetrad

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