Ecological Archives E096-050-A1

Jessica F. Stephenson, Cock Van Oosterhout, Ryan S. Mohammed, and Joanne Cable. 2015. Parasites of Trinidadian guppies: evidence for sex- and age-specific trait-mediated indirect effects of predators. Ecology 96:489498. http://dx.doi.org/10.1890/14-0495.1

Appendix A. Tables summarizing the sampled sites and the analysis describing patterns in Gyrodactylus abundance.

Table A1. Summary of the data set.

Drainage

River

Course

Site

Years Sampled

UTM (20P)

Sample size

Gyrodactylus spp. prevalence

Gyrodactylus spp. mean intensity

Other symbionts present (prevalence)

GPS E

GPS N

Caroni

Arima

Lower

1

2006

689982

1173762

50

0

-

Fungus (0.020)

2

2003

689016

1176837

53

0.84

6.69

 

Mid

 

2003, 2006

687034

1179246

69

0.58

24.15

Trichodina (0.145), Ichthyophthirius (0.029), Fungus (0.014)

Upper

 

2003

687672

1178320

64

0.14

2.44

 

Aripo

Lower

 

2003, 2006, 2008

694410

1177783

291

0.40

5.44

Trichodina (0.007), Fungus (0.003), Digenean (0.034)

Upper

1

2006, 2008

694030

1182128

73

0.08

1.00

Fungus (0.028)

2

2008

692771

1182303

30

0.38

3.90

 

3

2006, 2008

693230

1182328

145

0.67

1.10

Trichodina (0.076), Fungus (0.069)

4

2006

693221

1181917

56

0.07

2.64

 

5

2003

693277

1181843

4

0.00

-

 

6

2003

?

 

56

0.50

1.54

 

7

2003

?

 

24

0.43

2.50

 

8

2003

693277

1181843

102

0.62

3.29

Fungus (0.008)

9

2006

693823

1180613

48

0.02

2.00

Ichthyophthirius (0.104)

Caura

Lower

 

2003

678436

1177236

227

0.00

-

 

Upper

1

2003, 2004

699539

1182054

153

0.24

1.81

Fungus (0.007)

2

2003

679627

1182692

110

0.00

-

 

3

2003

679757

1182475

77

0.19

1.47

 

Dyke

Lower

1

2003, 2004, 2006

674748

1177894

92

0.10

26.56

Trichodina (0.022), Fungus (0.022)

2

2003, 2006

675080

1177892

184

0.61

4.71

Trichodina (0.016), Digenean (0.016)

3

2003,

2004

674869

1177433

177

0.21

1.81

Trichodina (0.751)

Guanapo

Lower

 

2003, 2004, 2006

691385

1174569

232

0.23

2.68

Trichodina (0.103)

Mid

 

2003

691815

1176691

20

0.20

4.00

 

Upper

 

2003

690247

1182015

91

0.11

1.80

 

Lopinot

Lower

 

2003, 2004, 2006

683553

1175663

453

0.60

5.00

Digenean (0.002)

Mid

 

2006

684127

1156566

30

0.40

1.50

Fungus (0.024)

Upper

 

2003, 2004, 2006

683520

1182443

187

0.38

2.80

 

Maracas

Upper

 

2003

671265

1183604

145

0.44

9.05

 

Coffee

Coffee

Lower

 

2009

651072

1132467

41

0.00

-

Fungus (0.024)

Cunupia

Dyke

Lower

1

2006

678485

1168663

22

0.23

1.00

Trichodina (0.500)

2

2006

 673445

 1165676

50

0.02

1.00

Trichodina (0.920),

Ichthyophthirius (0.020)

Guapo

Guapo

Lower

1

2006

 646956

 1124820

1

1.00

5.00

Trichodina (1.000)

2

2006

 646609

 1125009

10

0.80

1.63

Trichodina (0.800), Digenean (0.300)

La Seiva

La Seiva

Lower

 

2006

 

 

61

0.08

1.40

Ichthyophthirius (0.016), Fungus (0.033)

Lizard

Lizard

Lower

 

2004

 715789

 1122959

12

0.00

-

 

Marianne

Marianne

Lower

 

2003, 2004

685890

1193642

70

0.71

3.10

 

Mid

1

2006

 

 

4

0.00

-

 

2

2006

 

 

31

0.00

-

Ichthyophthirius (0.065), Fungus (0.032)

Upper

 

2003, 2004

685891

1192747

171

0.13

1.59

 

Matura

Matura

Lower

 

2006

713012

1181533

49

0.39

1.47

Fungus (0.041)

Mayaro

Pilote

Lower

 

2004

 711697

 1121927

16

0.00

-

 

Tributary

Lower

1

2006

719160

1138112

20

1.00

10.50

Trichodina (0.950),

Fungus (0.100), Digenean (0.05)

2

2006

719153

1137295

20

0.95

16.89

Trichodina (0.800),

Nariva

Manzanilla

Lower

 

2006

 

 

3

1.00

1.33

 

North East

Toco

Lower

 

2006

727327

1198431

3

0.00

-

 

Oropuche

Oropuche

Lower

 

2006

 

 

45

0.60

1.85

 

Mid

 

2006

704386

1178808

4

0.50

2.50

 

Upper

 

2006

 

 

52

0.67

2.46

 

Turure

Lower

 

2003, 2004

700333

1178556

158

0.22

1.47

 

Upper

1

2003

 

 

56

0.00

-

 

2

2006

700442

1183253

16

0.00

-

 

3

2003, 2004

700494

1180614

91

0.00

-

 

Pitch Lake

Pitch Lake

Lake

1

2004, 2006

650309

1131471

118

0.03

1.00

Trichodina (0.009),

2

2006

 650309

 1131471

78

0.27

1.52

Ichthyophthirius (0.423),

Digenean (0.013)

Visigney

Lower

 

2009

 650110

 1129992

28

0.11

1.00

Fungus (0.036)

Silverstream

Silverstream

Lower

 

2006

657517

1129995

25

0.00

-

 

Mid

 

2006

656792

1128331

11

0.00

-

Trichodina (0.091),

Fungus (0.273),

Digenean (0.273)

Tarouba

Tarouba

Mid

 

2006

 659331

 1130492

12

0.00

-

Digenean (0.333)

Vance

Vance

Mid

 

2006

649782

1127854

35

0.09

1.00

 

 

Upper

 

2009

649751

1127459

42

0.02

1.00

Fungus (0.024)

Yarra

Yarra

Lower

 

2003

680414

1194065

58

0.52

2.07

 

 

Upper

 

2004, 2006

683427

1189518

59

0.14

2.63

Camallanus nematode (0.017)

TOTAL

 

 

 

 

 

 

4715

 

 

 

 

Table A2. The top-ranked candidate models explaining variation in Gyrodactylus spp. abundance.

Model

Degrees of Freedom

Log Likelihood Ratio

AIC

ΔAIC

AIC weight

2/3/4/5/6/7/8

23

-4094.74

8235.49

0.00

0.69

1/2/3/4/5/6/7/8

24

-4094.56

8237.13

1.64

0.31

Note:AIC = Akaike information criteria value; the terms are coded as follows: 1: Presence of Trichodina; 2: Course; 3: Host class, 4: Year, 5: Weight, 6: Course:Host class, 7: Course:Weight; 8: Sex:Weight.

 

Table A3. Model averaged standardised coefficients, unconditional standard error, and 95% confidence intervals of model predictors for Gyrodactylus spp. abundance.

Predictor

Standardized

coefficient

Unconditional

SE

95% Confidence Intervals

Relative Importance of overall predictor

2.5%

97.5%

(Intercept)

-0.561

0.873

-2.272

1.151

 

Course-lower

1.239

0.899

-0.522

3.000

Course = 1

Course-mid

1.515

1.026

-0.495

3.525

Course-upper

1.054

0.921

-0.751

2.859

Host class-j

1.037

0.633

-0.203

2.277

Sex = 1

Host class-m

-0.023

0.290

-0.590

0.545

Year-2004

0.059

0.064

-0.065

0.184

Year = 1

Year-2006

0.801

0.067

0.669

0.933

Year-2008

1.095

0.169

0.764

1.426

Weight

0.672

0.431

-0.173

1.517

Weight = 1

lower:j

-1.014

0.629

-2.247

0.219

Course:Sex = 1

mid:j

-3.101

0.695

-4.463

-1.739

upper:j

-1.141

0.634

-2.383

0.101

lower:m

-0.111

0.295

-0.690

0.468

mid:m

-0.349

0.396

-1.124

0.427

upper:m

-0.062

0.303

-0.656

0.532

lower:weight

-0.249

0.436

-1.103

0.605

Course:Weight = 1

mid:weight

0.578

0.524

-0.448

1.604

upper:weight

-0.599

0.441

-1.463

0.264

j:weight

1.118

0.302

0.526

1.710

Sex:Weight = 1

m:weight

-0.066

0.154

-0.368

0.236

Trichodina

0.068

0.113

-0.153

0.289

Trichodina = 0.31

Note: Predictors for which the confidence intervals do not bound zero are highlighted.


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