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Table 2 The intra- and interspecific aggressive interactions given and received by each focal waterbird species

From: Aggressive behavioural interactions between swans (Cygnus spp.) and other waterbirds during winter: a webcam-based study

Species

Interaction

nIntra

nInter

nTotal

PIntra

PIntra 95% CI

PInter

PInter 95% CI

P value

Bewick’s Swan

To other

245

171

416

0.589

0.540–0.637

0.411

0.363–0.460

0.003

 

From other

245

68

313

0.783

0.733–0.827

0.217

0.173–0.267

< 0.001

Mute Swan

To other

364

155

519

0.701

0.660–0.740

0.299

0.260–0.340

< 0.001

 

From other

364

35

399

0.912

0.880–0.938

0.088

0.062–0.120

< 0.001

Whooper Swan

To other

137

34

171

0.801

0.733–0.858

0.199

0.142–0.267

< 0.001

 

From other

137

83

220

0.623

0.555–0.687

0.377

0.313–0.445

0.003

Canada Goose

To other

190

55

245

0.776

0.718–0.826

0.224

0.174–0.282

< 0.001

 

From other

190

45

235

0.809

0.752–0.857

0.191

0.143–0.248

< 0.001

Greylag Goose

To other

39

15

54

0.722

0.584–0.835

0.278

0.165–0.416

0.012

 

From other

39

7

46

0.848

0.711–0.937

0.152

0.063–0.289

< 0.001

Common Shelduck

To other

2

3

5

0.400

0.053–0.853

0.600

0.147–0.947

1.000

 

From other

2

0

2

1.000

0.158–1.000

0.000

0.000–0.842

1.000

Northern Mallard

To other

240

96

336

0.714

0.663–0.762

0.286

0.238–0.337

< 0.001

 

From other

240

136

376

0.638

0.587–0.687

0.362

0.313–0.413

< 0.001

Northern Pintail

To other

356

110

466

0.764

0.723–0.802

0.236

0.198–0.277

< 0.001

 

From other

356

171

527

0.676

0.634–0.715

0.324

0.285–0.366

< 0.001

Eurasian Teal

To other

146

39

185

0.789

0.723–0.846

0.211

0.154–0.277

< 0.001

 

From other

146

74

220

0.664

0.597–0.726

0.336

0.274–0.403

< 0.001

Tufted Duck

To other

152

40

192

0.792

0.727–0.847

0.208

0.153–0.273

< 0.001

 

From other

152

51

203

0.749

0.683–0.807

0.251

0.193–0.317

< 0.001

Common Pochard

To other

10

5

15

0.667

0.384–0.882

0.333

0.118–0.616

1.000

 

From other

10

2

12

0.833

0.516–0.979

0.167

0.021–0.484

0.270

Eurasian Coot

To other

61

40

101

0.604

0.502–0.700

0.396

0.300–0.498

0.276

 

From other

61

66

127

0.480

0.391–0.571

0.520

0.429–0.609

1.000

Common Moorhen

To other

102

25

127

0.803

0.723–0.868

0.197

0.132–0.277

< 0.001

 

From other

102

41

143

0.713

0.632–0.786

0.287

0.214–0.368

< 0.001

Gull spp.

To other

19

0

19

1.000

0.824–1.000

0.000

0.000–0.176

< 0.001

 

From other

19

11

30

0.633

0.439–0.801

0.367

0.199–0.561

1.000

  1. A comparison of the proportions of intraspecific (PIntra) and interspecific (PInter) aggressive interactions given and received by each focal waterbird species. All P values associated with our binomial tests were adjusted using Holm-Bonferroni corrections for multiple comparisons. Total numbers of interactions (n) are also indicated
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Avian Research

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