Thames Estuary and Marshes SPA Alerts
Of the 14 species evaluated, four species have had alerts triggered, including one that occurs in internationally important numbers. Some of these species have not undergone either national or regional declines of the same magnitude and there is thus some cause for concern, such as European white-fronted goose. More details on these alerts are presented in the following species accounts.
Maclean (et al., 2005) identified that threats to the SPA include considerable infrastructure development, sea-level rise that may result in erosion and flooding, dredging proposals, a lack of management, and water shortages for wetland enhancements.
Species | Selection Stage | First Winter | Last Winter | Short-term % change | Medium-term % change | Long-term % change | % change since notification | Short-term alert-status | Medium-term alert-status | Long-term alert-status | Alert-status since notification (1999) |
---|---|---|---|---|---|---|---|---|---|---|---|
Little grebe (LG) | 1.3 | 88/89 | 02/03 | 16 | 62 | 114 | 6 | o | + | ++ | (o) |
European white-fronted goose (EW) | 1.3 | 77/78 | 02/03 | -11 | -1 | -31 | 16 | o | o | - | (o) |
Shelduck (SU) | 1.3 | 77/78 | 02/03 | -27 | -48 | -17 | -19 | (-) | - | o | (o) |
Gadwall (GA) | 1.3 | 77/78 | 02/03 | -15 | 26 | 506 | -18 | o | o | ++ | (o) |
Pintail (PT) | 1.3 | 77/78 | 02/03 | 19 | -22 | 164 | 17 | o | o | ++ | (o) |
Shoveler (SV) | 1.3 | 77/78 | 02/03 | -13 | -4 | 43 | -8 | o | o | + | (o) |
Avocet (AV) | 1.1 | 77/78 | 02/03 | 27 | 141 | 0 | o | ++ | (o) | ||
Ringed plover (RP) | 1.2 | 77/78 | 02/03 | -13 | -59 | 10 | -10 | o | -- | o | (o) |
Grey plover (GV) | 1.3 | 77/78 | 02/03 | -12 | -24 | 209 | -22 | o | o | ++ | (o) |
Lapwing (L_) | 1.3 | 77/78 | 02/03 | 1 | 2 | 390 | -6 | o | o | ++ | (o) |
Knot (KN) | 1.2 | 77/78 | 02/03 | -51 | 58 | 75 | -46 | (--) | + | + | (-) |
Dunlin (DN) | 1.3 | 77/78 | 02/03 | -44 | -44 | -17 | -33 | (-) | - | o | (-) |
Black-tailed godwit (BW) | 1.3 | 77/78 | 02/03 | 115 | 0 | 296 | 57 | ++ | o | ++ | (+) |
Redshank (RK) | 1.3 | 77/78 | 02/03 | -10 | 2 | 42 | -11 | o | o | + | (o) |