First and Last Dates of Migrant Birds in Suffolk
1950-2004
Table 1. First arrivai dates. Numbers of years of data in the 55-year (1950-2004) period, overall mean date and Standard déviation (SD) of date. The earliest and latest recorded calendar dates are given. The différence ("Diff") between mean dates for 1950-1977 and 1978-2004 is tested using two sample t-tests, significant results are shown in bold. Species are arranged in order of increasing mean date. Wheatear Stane Curlew Chiffchaff Greenshank Garganey Sand Martin Black Redstart Little Ringed Piover Sandwich Tern Whimbrel Swallow Willow Warbler Blackcap House Martin Yellow Wagtail Redstart Ring Ouzel Sedge Warbler Common Sandpiper Tree Pipit Common Tern Cuckoo Nightingale Whitethroat Grasshopper Warbler Whinchat Turtle Dove Little Tern Reed Warbler Osprey Lesser Whitethroat Garden Warbler Swift Wryneck Pied Flycatcher Curlew Sandpiper Arctic Tern Black Tern Wood Warbler Spotted Flycatcher Hobby Wood Sandpiper Nightjar Red-backed Shrike Fieldfare Redwing
54 52 37 17 41 54 17 30 49 36 54 54 34 54 54 54 36 55 16 52 45 54 53 52 52 53 54 46 53 21 54 54 55 26 34 16 30 34 34 54 31 33 51 40 47 40
mean date SD 16-Mar 8.3 18-Mar 10.5 18-Mar 7.3 23-Mar 30.2 24-Mar 10.4 24-Mar 11.2 25-Mar 15.4 26-Mar 14.9 27-Mar 13.0 29-Mar 15.2 30-Mar 8.3 30-Mar 6.6 01-Apr 16.1 02-Apr 11.9 02-Apr 7.7 04-Apr 8.7 04-Apr 14.8 06-Apr 6.6 07-Apr 31.1 08-Apr 7.8 09-Apr 7.0 10-Apr 7.6 12-Apr 5.0 13-Apr 5.7 14-Apr 7.3 16-Apr 10.3 17-Apr 7.3 18-Apr 4.2 18-Apr 6.7 19-Apr 14.1 19-Apr 6.1 19-Apr 7.7 9.4 22-Apr 22-Apr 16.4 26-Apr 11.9 27-Apr 31.4 28-Apr 27.7 29-Apr 11.6 30-Apr 10.5 7.4 02-May 03-May 26.8 9.1 03-May 08-May 5.7 8.4 12-May 10-Sep 21-Sep
22.5 12.7
Mean dates latest 1¡950-1977 1978-2004 Diff earliest 12-Mar - 6 . 5 19-Mar 1 l-Apr-52 25-Feb-90 18-Mar -0.7 19-Mar 13-Apr-71 20-Feb-60 06-Apr-62 04-Mar-66 28-Apr-94 29-Jan-50 26-Mar 23-Mar -2.7 15-Apr-80 28-Feb-73 17-Mar - 1 3 . 3 30-Mar 13-Apr-71 21-Feb-90 30-Apr-60 01-Mar-85 07-May-50 03-Mar-97 23-Mar - 8 . 7 31-Mar 21-May-50 06-Mar-69 07-Apr 25-Mar - 1 2 . 7 12-Feb-79 18-Apr-53 27-Mar - 7 . 0 03-Apr 08-Mar-04 28-Apr-87 27-Mar - 5 . 5 01-Apr 14-Apr-70/75 16-Mar-85 21-Apr-62 13-Jan-60 28-Mar - 9 . 9 07-Apr 18-Apr-76 17-Feb-98 29-Mar - 7 . 7 06-Apr 12-Apr-56 08-Mar-90 01-Apr 07-Apr 5.3 19-Apr-92 15-Mar-97 03-May-60 06-Mar-03 03-Apr - 6 . 2 24-Apr-54 09-Apr 22-Mar-02 25-May-56 03-Jan-59 03-Apr - 8 . 7 26-Apr-50 12-Apr 21-Mar-68 06-Apr - 7 . 3 13-Apr 26-Apr-53 26-Mar-80 08-Apr -2.3 11-Apr 22-Apr-54 14-Mar-90 10-Apr -2.4 13-Apr 27-Apr-54 03-Apr-91/02 15-Apr 12-Apr - 3 . 4 01-May-72 01 -Apr-59 10-Apr - 7 . 2 17-Apr 29-Apr-56 Ol-Apr-89/95 15-Apr -3.0 18-Apr 1 l-May-72 20-Mar-64 15-Apr - 5 . 4 20-Apr 04-May-60 01-Apr-94 19-Apr 17-Apr -2.2 26-Apr-72 08-Apr-89 15-Apr - 7 . 2 22-Apr 05-Apr-80/89 01 -May-50 & 62 20-May-56 29-Mar-86/97 18-Apr -2.8 20-Apr 02-May-70 04-Apr-59 17-Apr - 5 . 1 22-Apr 04-May-70 03-Apr-02 15-Apr - 1 0 . 2 26-Apr 16-Mar-83 05 -May-57 & 79 21 -May-54 29-Mar-02 22-May-59 04-Apr-58 25-May-60 19-Jan-53 28-Jul-60 06-Apr-99/03 1 l-Jun-56 08-Apr-67 29-May-53 13-Apr-95 30-Apr - 5 . 5 05-May 16-May-57 09-Apr-83 20-Apr - 4 1 . 1 29-Jul-59 31-May 10-Apr-97/04 20-May-56 16-Apr-83 08-May 07-May -0.5 15-May-80 17-Apr-04 18-May 8.6 08-Jun-91 09-May 27-Apr-56 21-Jul-1963 03-Aug-1953
19
31-Oct-1952 17-Oct-1958
12-Sep 22-Sep
9-Sep 21-Sep
-2.3 -1.2