The Wetland Bird Survey (WeBS) - Alerts

England

Data evaluated: winters to 2004/05 inclusive (New evaluation due: December 2009 to include additional data to winter 2007/08)

40 Species evaluated: 's Swan, Whooper Swan, European White-fronted Goose, Brent Goose (dark-bellied), Light-bellied Brent Goose (Svalbad population), Shelduck, Wigeon, Gadwall, Teal, Mallard, Pintail, Shoveler, Pochard, Tufted Duck, Scaup, Eider, Common Scoter, Goldeneye, Red-breasted Merganser, Goosander, Little Grebe, Great Crested Grebe, Cormorant, Little Egret, Coot, Oystercatcher, Avocet, Ringed Plover, Golden Plover, Grey Plover, Lapwing, Knot, Sanderling, Purple Sandpiper, Dunlin, Black-tailed Godwit, Bar-tailed Godwit, Curlew, Redshank, Turnstone

High Alert: European White-fronted Goosem,l Medium Alert: European White-fronted Goose(s), Brent Goose (dark-bellied)m, Mallardl, Pintail(l), Scaups, Eiders,m,l, Goosander(s), Purple Sandpipers,m

Summary:

Of the 40 species evaluated, alerts have been triggered for eight species. Of the eight species that have had Alerts triggered, one species has had a High-Alert triggered. Of the eight species that have had Alerts triggered, two Alerts have been flagged as precautionary because the species in question exhibits inherent variability in numbers.

Table for Alerts status for site Species: Click here for the species accounts Click here for complete account - pdf version (*pdf often >1Mb) View Plots: Bewick's Swan (BS) Whooper Swan (WS) European White-fronted Goose (EW) Brent Goose (dark-bellied) (DB) Light-bellied Brent Goose (Svalbad population) (QS) Shelduck (SU) Wigeon (WN) Gadwall (GA) Teal (T0) Mallard (MA) Pintail (PT) Shoveler (SV) Pochard (PO) Tufted Duck (TU) Scaup (SP) Eider (E0) Common Scoter (CX) Goldeneye (GN) Red-breasted Merganser (RM) Goosander (GD) Little Grebe (LG) Great Crested Grebe (GG) Cormorant (CA) Little Egret (ET) Coot (CO) Oystercatcher (OC) Avocet (AV) Ringed Plover (RP) Golden Plover (GP) Grey Plover (GV) Lapwing (L0) Knot (KN) Sanderling (SS) Purple Sandpiper (PS) Dunlin (DN) Black-tailed Godwit (BW) Bar-tailed Godwit (BA) Curlew (CU) Redshank (RK) Turnstone (TT)

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^s Short-term (5-year)
^m Medium-term (10-year)
^l Long-term (25-year or maximum available if less)

Trends have been assessed over the short-, medium-, and long-terms (5, 10 and up to 25 years respectively). Where data have been collected for less than 25 years (see Methods) the maximum number of years available are used for calculating long-term alerts (specific details are available within the detailed account). Where time periods for which Alerts are triggered are given in parentheses this indicates that the degree of change in numbers that has triggered that Alerts might be considered within the range of normal fluctuation for a "healthy population" of the species in question over the period indicated (see Methods 2.3 - biological filter), and as such will not necessarily be discussed in detail.