Bird stomach contents analysis - final report: Goosander and Cormorant diet on four Scottish rivers 2019 to 2020
This study analysed the stomach contents of goosanders and cormorants collected from the Rivers Tweed, Dee, Nith and Spey during 2019 and 2020 in order to to assess whether there was evidence of substantial changes in the diets of these species of fish-eating birds since the 1990s.
Appendix 2: Biometric measurements of Goosanders and Cormorants received
Biometric details of Goosanders and cormorants received in the present study. Sex determined as male (M) or female (F), age as adult (Ad) or Juvenile (Juv) based on plumage (Cramp & Simmons 1977). Body mass to the nearest 5g. Wing length is maximum flattened chord length to nearest mm (Spencer 1983).
Code |
Species |
River |
Date of collection |
Sex |
Age class |
Body mass (kg) |
Standard wing length (mm) |
|---|---|---|---|---|---|---|---|
DeeG1 |
Goos |
Dee |
25/04/2019 |
M |
Ad |
1.60 |
285 |
DeeG2 |
Goos |
Dee |
01/05/2019 |
M |
Ad |
1.65 |
296 |
DeeG3 |
Goos |
Dee |
26/03/2019 |
M |
Ad |
1.60 |
287 |
DeeG4 |
Goos |
Dee |
17/04/2019 |
F |
N/d |
1.25 |
269 |
DeeG5 |
Goos |
Dee |
06/04/2019 |
M |
Juv |
1.35 |
285 |
DeeG6 |
Goos |
Dee |
17/04/2019 |
F |
Ad |
1.25 |
263 |
DeeG7 |
Goos |
Dee |
02/05/2019 |
M |
Ad |
1.65 |
285 |
DeeG8 |
Goos |
Dee |
22/03/2019 |
M |
Juv |
1.45 |
287 |
DeeG9 |
Goos |
Dee |
02/04/2019 |
M |
Ad |
1.50 |
287 |
DeeG10 |
Goos |
Dee |
29/03/2019 |
F |
Ad |
1.50 |
271 |
DeeG11 |
Goos |
Dee |
09/04/2019 |
M |
Ad |
1.45 |
289 |
DeeG12 |
Goos |
Dee |
25/04/2019 |
F |
Juv |
1.20 |
261 |
DeeG13 |
Goos |
Dee |
02/04/2019 |
F |
Ad |
1.15 |
265 |
DeeG14 |
Goos |
Dee |
23/04/2019 |
F |
Ad |
1.35 |
263 |
DeeG15 |
Goos |
Dee |
18/04/2019 |
F |
Ad |
1.50 |
268 |
DeeG16 |
Goos |
Dee |
01/05/2019 |
M |
Ad |
1.65 |
302 |
DeeG17 |
Goos |
Dee |
29/04/2019 |
F |
Ad |
1.40 |
263 |
DeeG18 |
Goos |
Dee |
06/03/2019 |
F |
Juv |
1.25 |
266 |
DeeG19 |
Goos |
Dee |
02/04/2019 |
F |
Ad |
1.45 |
261 |
DeeG20 |
Goos |
Dee |
10/04/2019 |
M |
Ad |
1.65 |
294 |
NithG1 |
Goos |
Nith |
18/04/2019 |
M |
Ad |
1.60 |
296 |
NithG2 |
Goos |
Nith |
18/04/2019 |
M |
Juv |
1.80 |
280 |
NithG3 |
Goos |
Nith |
24/04/2019 |
M |
Ad |
1.70 |
279 |
NithG4 |
Goos |
Nith |
24/04/2019 |
M |
Ad |
1.60 |
292 |
NithG5 |
Goos |
Nith |
24/04/2019 |
M |
Ad |
1.65 |
290 |
NithG6 |
Goos |
Nith |
24/04/2019 |
F |
Ad |
1.35 |
265 |
NithG7 |
Goos |
Nith |
08/05/2019 |
M |
Ad |
1.55 |
282 |
NithG8 |
Goos |
Nith |
08/05/2019 |
M |
Ad |
1.50 |
291 |
NithG9 |
Goos |
Nith |
08/05/2019 |
M |
Ad |
1.60 |
294 |
NithG10 |
Goos |
Nith |
22/05/2019 |
M |
Ad |
1.40 |
284 |
NithG11 |
Goos |
Nith |
26/04/2019 |
M |
Juv |
1.70 |
275 |
NithG12 |
Goos |
Nith |
30/04/2019 |
M |
Juv |
1.90 |
290 |
NithG13 |
Goos |
Nith |
05/04/2019 |
M |
Juv |
1.50 |
281 |
NithG14 |
Goos |
Nith |
16/04/2019 |
M |
Juv |
1.50 |
271 |
NithG15 |
Goos |
Nith |
16/04/2019 |
M |
Ad |
N/d |
285 |
TwG23 |
Goos |
Tweed |
01/05/2019 |
M |
Ad |
1.55 |
296 |
TwG24 |
Goos |
Tweed |
16/04/2019 |
F |
N/d |
1.20 |
261 |
TwG25 |
Goos |
Tweed |
15/04/2019 |
M |
Ad |
1.75 |
291 |
TwG26 |
Goos |
Tweed |
12/04/2019 |
M |
Ad |
1.55 |
286 |
TwG27 |
Goos |
Tweed |
03/05/2019 |
M |
Ad |
1.45 |
291 |
TwG28 |
Goos |
Tweed |
29/05/2019 |
M |
Ad |
1.55 |
291 |
TwG29 |
Goos |
Tweed |
25/05/2019 |
M |
Ad |
1.40 |
N/d |
TwG30 |
Goos |
Tweed |
30/04/2019 |
F |
N/d |
1.15 |
276 |
TwG31 |
Goos |
Tweed |
15/04/2019 |
M |
Ad |
1.30 |
299 |
TwG32 |
Goos |
Tweed |
24/05/2019 |
M |
Ad |
1.70 |
294 |
TwG33 |
Goos |
Tweed |
30/04/2019 |
M |
Ad |
1.70 |
293 |
TwG34 |
Goos |
Tweed |
31/05/2019 |
M |
Ad |
1.85 |
287 |
TwG36 |
Goos |
Tweed |
03/04/2019 |
F |
N/d |
1.35 |
251 |
TwG53 |
Goos |
Tweed |
04/04/2019 |
F |
Ad |
1.35 |
263 |
SpeyG1 |
Goos |
Spey |
13/04/2019 |
M |
Ad |
1.60 |
293 |
SpeyG2 |
Goos |
Spey |
01/04/2019 |
F |
Juv |
1.00 |
261 |
SpeyG3 |
Goos |
Spey |
09/04/2019 |
F |
Ad |
1.35 |
271 |
SpeyG4 |
Goos |
Spey |
29/04/2019 |
M |
Ad |
1.50 |
293 |
SpeyG5 |
Goos |
Spey |
24/04/2019 |
M |
Ad |
1.65 |
302 |
SpeyG6 |
Goos |
Spey |
11/04/2019 |
F |
Ad |
1.45 |
266 |
SpeyG7 |
Goos |
Spey |
25/04/2019 |
M |
Ad |
1.70 |
295 |
SpeyG8 |
Goos |
Spey |
25/04/2019 |
M |
Ad |
1.80 |
294 |
SpeyG9 |
Goos |
Spey |
26/03/2019 |
M |
Ad |
1.55 |
297 |
SpeyG10 |
Goos |
Spey |
18/03/2019 |
M |
Ad |
1.45 |
286 |
SpeyG11 |
Goos |
Spey |
15/04/2019 |
M |
Ad |
1.60 |
288 |
SpeyG12 |
Goos |
Spey |
01/04/2019 |
M |
Ad |
1.50 |
282 |
SpeyG13 |
Goos |
Spey |
11/04/2019 |
M |
Ad |
1.50 |
295 |
SpeyG14 |
Goos |
Spey |
03/04/2019 |
M |
Ad |
N/d |
291 |
SpeyG15 |
Goos |
Spey |
11/04/2019 |
F |
Ad |
1.35 |
273 |
Nith Corm1 |
Corm |
Nith |
04/04/2019 |
N/d |
Juv |
2.70 |
357 |
NithCorm2 |
Corm |
Nith |
05/04/2019 |
N/d |
Ad |
2.05 |
330 |
NithCorm3 |
Corm |
Nith |
26/04/2019 |
N/d |
Juv |
2.50 |
357 |
NithCorm4 |
Corm |
Nith |
20/03/2019 |
N/d |
Juv |
2.50 |
339 |
NithCorm5 |
Corm |
Nith |
20/03/2019 |
N/d |
Juv |
2.40 |
332 |
NithCorm6 |
Corm |
Nith |
11/04/2019 |
N/d |
Juv |
3.00 |
360 |
TweedCorm4 |
Corm |
Tweed |
11/04/2019 |
N/d |
Juv |
2.90 |
360 |
TweedCorm5 |
Corm |
Tweed |
23/05/2019 |
N/d |
Juv |
2.85 |
345 |
TweedCorm6 |
Corm |
Tweed |
02/04/2019 |
N/d |
Juv |
2.40 |
355 |
TweedCorm7 |
Corm |
Tweed |
23/05/2019 |
N/d |
Juv |
3.05 |
364 |
TweedCorm8 |
Corm |
Tweed |
24/05/2019 |
N/d |
Juv |
1.85 |
340 |
TweedCorm9 |
Corm |
Tweed |
24/05/2019 |
N/d |
Juv |
2.15 |
357 |
TweedCorm10 |
Corm |
Tweed |
24/05/2019 |
N/d |
Juv |
3.05 |
361 |
TweedCorm11 |
Corm |
Tweed |
28/05/2019 |
N/d |
Juv |
2.00 |
353 |
TweedCorm12 |
Corm |
Tweed |
24/05/2019 |
N/d |
Juv |
2.40 |
350 |
SpeyCorm1 |
Corm |
Spey |
02/04/2019 |
N/d |
Juv |
3.65 |
364 |
DeeG21 |
Goos |
Dee |
22/11/2019 |
F |
N/d |
1.35 |
253 |
DeeG22 |
Goos |
Dee |
25/11/2019 |
M |
Juv |
1.85 |
286 |
NithG16 |
Goos |
Nith |
13/10/2019 |
F |
N/d |
1.45 |
271 |
NithG17 |
Goos |
Nith |
15/11/2019 |
F |
N/d |
1.45 |
263 |
NithG18 |
Goos |
Nith |
08/11/2019 |
F |
N/d |
1.40 |
259 |
NithG19 |
Goos |
Nith |
08/11/2019 |
M |
N/d |
1.65 |
272 |
NithG20 |
Goos |
Nith |
20/11/2019 |
F |
N/d |
1.35 |
252 |
NithG21 |
Goos |
Nith |
20/11/2019 |
M |
N/d |
1.45 |
278 |
NithG22 |
Goos |
Nith |
28/01/2020 |
M |
Juv |
1.65 |
285 |
NithG23 |
Goos |
Nith |
22/01/2020 |
M |
Ad |
1.60 |
302 |
NithG24 |
Goos |
Nith |
04/02/2020 |
F |
N/d |
1.45 |
260 |
NithG25 |
Goos |
Nith |
03/02/2020 |
M |
Ad |
1.65 |
282 |
TweedGoos61 |
Goos |
Tweed |
09/09/2019 |
F |
N/d |
1.20 |
255 |
TweedGoos62 |
Goos |
Tweed |
25/10/2019 |
M |
Juv |
1.60 |
286 |
TweedGoos63 |
Goos |
Tweed |
05/11/2019 |
M |
Juv |
1.55 |
292 |
TweedGoos64 |
Goos |
Tweed |
20/11/2019 |
F |
N/d |
1.10 |
264 |
TweedGoos65 |
Goos |
Tweed |
09/09/2019 |
F |
N/d |
1.20 |
230 |
TweedGoos66 |
Goos |
Tweed |
14/10/2019 |
M |
Juv |
1.45 |
281 |
TweedGoos67 |
Goos |
Tweed |
20/09/2019 |
F |
N/d |
1.35 |
251 |
TweedGoos68 |
Goos |
Tweed |
23/09/2019 |
M |
Juv |
1.80 |
286 |
TweedGoos69 |
Goos |
Tweed |
23/09/2019 |
M |
Juv |
1.55 |
276 |
TweedGoos70 |
Goos |
Tweed |
03/10/2019 |
M |
Juv |
1.40 |
285 |
TweedGoos71 |
Goos |
Tweed |
04/10/2019 |
M |
Ad |
1.60 |
274 |
TweedGoos72 |
Goos |
Tweed |
14/10/2019 |
F |
N/d |
1.25 |
255 |
TweedGoos73 |
Goos |
Tweed |
17/10/2019 |
M |
Ad |
1.60 |
286 |
TweedGoos74 |
Goos |
Tweed |
22/10/2019 |
M |
Juv |
1.70 |
283 |
TweedGoos75 |
Goos |
Tweed |
24/10/2019 |
M |
Juv |
1.30 |
275 |
TweedGoos76 |
Goos |
Tweed |
06/11/2019 |
M |
Ad |
1.55 |
284 |
TweedGoos77 |
Goos |
Tweed |
08/11/2020 |
F |
N/d |
1.45 |
258 |
TweedGoos78 |
Goos |
Tweed |
09/11/2020 |
F |
N/d |
1.30 |
252 |
TweedGoos79 |
Goos |
Tweed |
10/11/2019 |
F |
N/d |
1.40 |
268 |
TweedGoos80 |
Goos |
Tweed |
10/11/2020 |
F |
N/d |
1.25 |
258 |
TweedGoos81 |
Goos |
Tweed |
11/11/2020 |
M |
Juv |
1.70 |
280 |
TweedGoos82 |
Goos |
Tweed |
19/11/2020 |
M |
Ad |
1.50 |
273 |
TweedGoos83 |
Goos |
Tweed |
20/11/2020 |
M |
Ad |
1.85 |
286 |
TweedGoos84 |
Goos |
Tweed |
28/11/2020 |
F |
N/d |
1.30 |
268 |
SpeyG16 |
Goos |
Spey |
11/09/2019 |
M |
Ad |
1.40 |
286 |
SpeyG17 |
Goos |
Spey |
03/10/2019 |
F |
N/d |
1.15 |
266 |
SpeyG18 |
Goos |
Spey |
03/10/2019 |
F |
N/d |
1.30 |
265 |
SpeyG19 |
Goos |
Spey |
14/10/2019 |
F |
N/d |
1.05 |
262 |
SpeyG20 |
Goos |
Spey |
29/11/2019 |
M |
Juv |
1.50 |
271 |
SpeyG21 |
Goos |
Spey |
04/12/2019 |
F |
N/d |
1.50 |
260 |
SpeyG22 |
Goos |
Spey |
18/12/2019 |
M |
Ad |
1.60 |
297 |
SpeyG23 |
Goos |
Spey |
19/12/2019 |
F |
N/d |
0.90 |
218 |
DeeCorm1 |
Corm |
Dee |
02/12/2019 |
N/d |
Juv |
3.70 |
375 |
DeeCorm2 |
Corm |
Dee |
05/12/2019 |
N/d |
Juv |
3.15 |
366 |
DeeCorm3 |
Corm |
Dee |
20/01/2020 |
N/d |
Juv |
3.30 |
366 |
DeeCorm4 |
Corm |
Dee |
03/12/2019 |
N/d |
Juv |
2.45 |
358 |
NithCorm7 |
Corm |
Nith |
08/11/2019 |
N/d |
Juv |
2.75 |
333 |
Nith Corm8 |
Corm |
Nith |
12/11/2019 |
N/d |
Juv |
2.85 |
356 |
NithCorm9 |
Corm |
Nith |
12/11/2019 |
N/d |
Juv |
2.25 |
353 |
NithCorm10 |
Corm |
Nith |
15/11/2019 |
N/d |
Juv |
2.75 |
353 |
NithCorm11 |
Corm |
Nith |
20/11/2019 |
N/d |
Juv |
2.20 |
340 |
NithCorm12 |
Corm |
Nith |
21/11/2019 |
N/d |
Juv |
2.85 |
337 |
NithCorm13 |
Corm |
Nith |
03/12/2019 |
N/d |
Juv |
3.65 |
373 |
NithCorm14 |
Corm |
Nith |
23/01/2020 |
N/d |
Juv |
3.40 |
366 |
NithCorm15 |
Corm |
Nith |
19/01/2020 |
N/d |
Juv |
2.70 |
353 |
NithCorm16 |
Corm |
Nith |
28/01/2020 |
N/d |
Juv |
3.10 |
380 |
NithCorm17 |
Corm |
Nith |
13/02/2020 |
N/d |
Ad |
2.90 |
354 |
NithCorm18 |
Corm |
Nith |
19/01/2020 |
N/d |
Juv |
1.65 |
308 |
TweedCorm24 |
Corm |
Tweed |
25/09/2019 |
N/d |
Ad |
2.90 |
361 |
TweedCorm25 |
Corm |
Tweed |
25/09/2019 |
N/d |
Juv |
2.90 |
348 |
TweedCorm26 |
Corm |
Tweed |
23/09/2019 |
N/d |
Juv |
2.15 |
340 |
TweedCorm27 |
Corm |
Tweed |
20/09/2019 |
N/d |
Juv |
2.10 |
353 |
TweedCorm28 |
Corm |
Tweed |
22/10/2019 |
N/d |
Juv |
2.80 |
365 |
TweedCorm29 |
Corm |
Tweed |
20/10/2019 |
N/d |
Juv |
2.65 |
358 |
TweedCorm30 |
Corm |
Tweed |
31/10/2019 |
N/d |
Juv |
2.40 |
353 |
TweedCorm31 |
Corm |
Tweed |
23/10/2019 |
N/d |
Juv |
2.70 |
354 |
TweedCorm32 |
Corm |
Tweed |
23/10/2019 |
N/d |
Juv |
2.75 |
352 |
TweedCorm33 |
Corm |
Tweed |
23/10/2019 |
N/d |
ad |
2.30 |
347 |
TweedCorm34 |
Corm |
Tweed |
02/10/2019 |
N/d |
Juv |
2.80 |
353 |
TweedCorm35 |
Corm |
Tweed |
05/10/2019 |
N/d |
Juv |
3.20 |
374 |
TweedCorm36 |
Corm |
Tweed |
24/10/2019 |
N/d |
Juv |
3.45 |
370 |
TweedCorm37 |
Corm |
Tweed |
15/10/2019 |
N/d |
Ad |
2.60 |
357 |
TweedCorm38 |
Corm |
Tweed |
23/10/2019 |
N/d |
Juv |
2.10 |
331 |
TweedCorm39 |
Corm |
Tweed |
22/10/2019 |
N/d |
Juv |
2.25 |
335 |
TweedCorm40 |
Corm |
Tweed |
22/10/2019 |
N/d |
Juv |
3.05 |
357 |
TweedCorm41 |
Corm |
Tweed |
06/11/2019 |
N/d |
Juv |
2.95 |
363 |
TweedCorm42 |
Corm |
Tweed |
19/11/2019 |
N/d |
Juv |
2.80 |
350 |
TweedCorm43 |
Corm |
Tweed |
01/11/2019 |
N/d |
Juv |
2.60 |
370 |
TweedCorm44 |
Corm |
Tweed |
19/11/2019 |
N/d |
Juv |
3.55 |
364 |
TweedCorm45 |
Corm |
Tweed |
10/09/2019 |
N/d |
Juv |
2.05 |
351 |
TweedCorm46 |
Corm |
Tweed |
21/09/2019 |
N/d |
Juv |
2.50 |
342 |
TweedCorm47 |
Corm |
Tweed |
15/10/2019 |
N/d |
Juv |
3.30 |
370 |
TweedCorm48 |
Corm |
Tweed |
24/10/2019 |
N/d |
Juv |
2.85 |
363 |
TweedCorm49 |
Corm |
Tweed |
25/10/2019 |
N/d |
Juv |
2.15 |
355 |
TweedCorm50 |
Corm |
Tweed |
19/11/2019 |
N/d |
Ad |
3.75 |
366 |
SpeyCorm2 |
Corm |
Spey |
04/12/2019 |
N/d |
Juv |
N/d |
373 |
SpeyCorm3 |
Corm |
Spey |
04/12/2019 |
N/d |
Juv |
3.45 |
360 |
SpeyCorm4 |
Corm |
Spey |
05/12/2019 |
N/d |
Juv |
4.15 |
374 |
SpeyCorm5 |
Corm |
Spey |
19/12/2019 |
N/d |
Juv |
3.95 |
372 |
SpeyCorm6 |
Corm |
Spey |
06/01/2020 |
N/d |
Juv |
3.45 |
373 |
SpeyCorm7 |
Corm |
Spey |
07/01/2020 |
N/d |
Juv |
3.45 |
357 |
SpeyCorm8 |
Corm |
Spey |
14/01/2020 |
N/d |
Juv |
2.90 |
366 |
SpeyCorm9 |
Corm |
Spey |
04/02/2020 |
N/d |
Juv |
3.60 |
375 |
SpeyCorm10 |
Corm |
Spey |
04/02/2020 |
N/d |
Juv |
3.85 |
366 |
SpeyCorm11 |
Corm |
Spey |
07/02/2020 |
N/d |
Juv |
1.95 |
344 |
SpeyCorm12 |
Corm |
Spey |
13/02/2020 |
N/d |
Juv |
4.30 |
381 |
SpeyCorm13 |
Corm |
Spey |
13/02/2020 |
N/d |
Juv |
1.75 |
330 |
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