This atlas has two components - Timed Tetrad Visits and Roving Records
within each 10 km square. The two components are equally valuable
and volunteers are actively being sought to contribute to the survey. If you wish to take part, please contact the BTO rep for the area you are interested in.
Within each 10 km square there are 25 tetrads as shown below:
E
J
P
U
Z
D
I
N
T
Y
C
H
M
S
X
B
G
L
R
W
A
F
K
Q
V
The map, below, shows the tetrad SJ26N, which means that its western
boundary is the easting 24 and the bottom boundary is northing 66, so
the tetrad includes the 1 km squares: SJ2466, SJ2467, SJ2566 and SJ2567
This is a tetrad based bird distribution atlas that
requires a comprehensive breeding bird species list for every tetrad in
north Wales, with the highest proof of breeding evidence that is
possible to identify. There are about 1600 tetrads that will require
records, so the project will welcome all assistance that people are
willing to offer. If you wish to survey any paricular tetrad or
tetrads, please contact the organiser in our area, Anne Brenchley. To see the area that is included in north Wales, please see the North Wales Breeding Bird Atlas website (link above).
The fieldwork for this atlas is linked to that for the BTO Atlas building up lists of breeding species for each tetrad. In the north Wales project there will be no Timed Tetrad Visits to assess relative abundance.
The codes used to assess breeding are:
Non-breeder
F - Flying over M - Migrant U - SUmmering non-breeder
Possible breeder
H - Observed in suitable nesting Habitat S - Singing male
Probable breeder
P - Pair in suitable nesting habitat T - Permanent Territory (defended for at least 1 week) D - Courtship and Display N - Visiting probable Nest site A - Agitated behaviour I - Brood patch of Incubating bird (from bird in the hand) B - Nest Building or excavating nest-hole
Confirmed breeder
DD - Distraction Display or injury feigning UN - Used Nest or eggshells found from this season FL - Recently FLedged young or downy young ON - Adults entering or leaving nest site in circumstances indicating Occupied Nest FF - Adult carrying Faecal sac or Food for young NE - Nest containing Eggs NY - Nest with Young seen or heard
Please use these codes in the record submission spreadsheet within the column 'Activity'.
