|
Categories
after AERC classification: |
|
A |
- |
species
recorded in a wild state at least once since 01.01.1951
(natural occurrence) |
|
B |
- |
species
recorded in a wild state between 1801 and 1950
(natural occurrence, former status) |
|
C |
- |
species
introduced by man, purposely or accidentally,
which have established self-supporting populations
(secondarily natural occurrence) |
|
D |
- |
species,
as to which doubt exists whether they ever occured
in a natural way (uncertain origin) |
|
E |
- |
species
from captivity, as well as dragged in or introduced,
which have not established self-supporting populations
(unnatural occurrence) |
|
Among
the national avifauna count species of categories
A, B and C (cats
D and E see appendix) |
| |
|
The
species’ status in Poland: |
|
B |
- |
breeding
regularly on major areas |
|
b |
- |
local
or sporadic breeder only |
|
R |
- |
regular
visitor during migration or wintering |
|
V |
- |
irregular
visitor (vagrant) |
|
v |
- |
extremely
rare vagrant (less than five records) |
|
(
) |
- |
former
status (category B) |
|
[
] |
- |
uncertain
origin (category D) |
|
x |
- |
unnatural
occurrence (category E) |
| |
|
|
| |
|
|
