Oxwich Marsh 21 July 2018: Autumn Migration begins

with No Comments
A third consecutive catch of over 200 birds. As in the previous two weeks we predominantly captured common resident species, supplemented by good numbers of sedge and reed warbler and occasional other long distance migrants.

Species
Name
New
Recaptured
Total
Blackbird
1
5
6
Blackcap
6
6
Blue Tit
11
17
28
Bullfinch
2
2
Cetti’s
Warbler
2
2
Chaffinch
11
3
14
Chiffchaff
1
1
Dunnock
5
15
20
Goldfinch
4
1
5
Great
Spotted Woodpecker
1
10
11
Great
Tit
17
43
60
Greenfinch
2
2
Reed
Bunting
3
6
9
Reed
Warbler
23
18
41
Robin
1
11
12
Sand
Martin
1
1
Sedge
Warbler
15
7
22
Siskin
6
9
15
Song
Thrush
1
1
Swallow
1
1
Whitethroat
1
1
Willow
Warbler
4
1
5
Wren
1
1
Grand
Total
117
149
266

The highlights were:

  • Our first sand martin of 2018. Captured leaving a reed bed roost just after dawn (along with a swallow). 
  • The first indications of return migration of the year. Adult reed and sedge warblers were captured with fat scores of four (BWG system).
  • A control reed warbler – details awaited, and a number of recaptures of reed warblers ringed in 2015 and 2016.
  • Our 28th newly ringed great spotted woodpecker of the year.
  • A dunnock ringed in March 2014, which had been recaptured in 2015, but not since.

The table below provides a breakdown of newly ringed birds between 1 Jan and 21 July 2018, and the the same period in 2017.

Species
Name
2018
2017
Diff
Blackbird
28
18
10
Blackcap
25
13
12
Blue Tit
138
60
78
Brambling
21
0
21
Bullfinch
11
8
3
Cetti’s
Warbler
5
9
-4
Chaffinch
130
54
76
Chiffchaff
12
26
-14
Coal Tit
2
2
0
Dunnock
43
22
21
Goldcrest
5
4
1
Goldfinch
159
218
-59
Grasshopper
Warbler
4
4
0
Great
Spotted Woodpecker
28
12
16
Great
Tit
154
48
106
Greenfinch
28
40
-12
Jack
Snipe
5
6
-1
Lesser
Redpoll
1
0
1
Lesser
Whitethroat
1
0
1
Long-tailed
Tit
3
6
-3
Marsh
Tit
3
0
3
Nuthatch
1
0
1
Reed
Bunting
48
23
25
Reed
Warbler
94
49
45
Robin
34
31
3
Sand
Martin
1
0
1
Sedge
Warbler
49
29
20
Siskin
175
128
47
Snipe
27
22
5
Song
Thrush
7
3
4
Stonechat
0
1
-1
Swallow
8
0
8
Treecreeper
3
2
1
Whitethroat
7
8
-1
Willow
Warbler
19
16
3
Wren
21
11
10
Yellowhammer
0
1
-1
Grand
Total
1300
874
426

Being over 400 (ringed) birds up on 2017 in mid-July is notable (we have also recaptured over 500 more birds than during the equivalent period of 2017), but a bit of bad weather in August or September (when catches are consistently large) will soon put us back in line with previous years. However, the autumn proper begins at the marsh at the end of the month (usually signalled by the first garden warbler of the year). It will be fascinating to see whether the larger catches are sustained.

Thanks to Heather Coats, Keith Vaughton, Wayne Morris, Val Wilson, Jo Conway, Alex McCubbin, Martin Thomas, Martin Georgiev and Dionne Jenkins for company and assistance. It was a tribute to the quality of the team we had out that it didn’t feel a particularly busy morning.

Owain Gabb
22/07/2018

Sand martin (Carly Green)

Subscribe
Notify of
0 Comments
Inline Feedbacks
View all comments