Table 3 Results of statistical analyses (Linear Mixed Models and Generalised Linear Mixed Models) on the effect of fire condition (burned versus unburned) and sex, and their interaction, on the morphology, diet, movements and habitat use of cane toads (Rhinella marina).

From: Sex-based differences in the use of post-fire habitats by invasive cane toads (Rhinella marina)

 

Variable

Fire

Sex

Fire*sex

DF

Effect

P

DF

Effect

P

DF

Effect

P

Body size

Snout-urostyle length

1, 10.78

− 2.95

0.01

1, 1316.8

− 0.16

0.88

2, 1305.3

0.72

0.47

Body mass

1, 10.93

− 2.71

0.02

1, 1316.9

− 4.51

0.000001

2, 1305.9

2.60

0.01

Relative to body mass

Body condition

1, 9.02

− 1.32

0.22

1, 1275.7

4.31

0.00002

2, 1182.2

− 1.57

0.12

Fat mass

1, 13.15

3.16

0.01

1, 443.2

− 1.30

0.19

2, 430.9

− 3.41

0.001

Stomach mass

1, 8.56

− 0.20

0.84

1, 460.6

− 7.61

0.000001

2, 461.8

3.62

0.0003

Liver mass

1, 9.55

1.20

0.26

1, 459.0

0.98

0.33

2, 460.0

− 1.87

0.06

Number of prey items

Total prey

1, 11.16

0.34

0.74

1, 464.4

− 5.11

0.000001

2, 462.0

1.71

0.09

Total prey groups

1, 12.85

− 0.32

0.76

1, 453.9

− 5.04

0.000001

2, 445.6

1.38

0.17

§

Coleopterans

 

− 0.07

0.95

 

− 6.12

0.000001

 

2.17

0.03

§

Debris

 

− 1.85

0.06

 

− 3.79

0.0001

 

2.56

0.01

§

Hymenopterans

 

0.61

0.54

 

− 2.18

0.03

 

0.59

0.56

§

Larvae

 

0.36

0.72

 

− 0.27

0.79

 

− 0.30

0.76

§

Lepidopterans

 

− 0.19

0.85

 

− 3.63

0.0003

 

2.19

0.03

§

Myriapods

 

− 1.34

0.18

 

− 4.64

0.000001

 

2.63

0.01

§

Orthopterans

 

− 1.68

0.09

 

− 0.28

0.78

 

0.28

0.78

§

Other prey

 

0.30

0.77

 

− 0.99

0.32

 

0.48

0.63

§

Spiders

 

0.99

0.32

 

− 0.50

0.62

 

0.07

0.95

Characteristics of refuges

Distance/height

Distance to road

1, 13.63

1.39

0.19

1, 53.26

2.20

0.03

2, 51.98

− 2.82

0.01

Distance to water

1, 9.14

− 2.15

0.06

1, 49.10

− 2.26

0.03

2, 47.21

1.06

0.30

Canopy height

1, 11.98

− 1.75

0.11

1, 49.77

− 2.03

0.05

2, 48.51

0.41

0.69

Understory height

1, 5.27

0.36

0.73

1, 43.97

0.40

0.69

2, 44.57

− 0.02

0.98

Grass height

1, 15.64

− 1.58

0.13

1, 53.30

− 1.75

0.09

2, 52.12

1.99

0.05

Percentage cover

Canopy

1, 11.62

0.18

0.86

1, 51.28

− 1.30

0.20

2, 53.03

− 1.15

0.26

Understory

1, 13.53

− 0.57

0.58

1, 51.76

− 1.29

0.20

2, 51.06

0.90

0.37

Bare ground and road

1, 9.92

− 0.42

0.68

1, 51.76

0.49

0.62

2, 49.12

− 1.08

0.29

Grass

1, 11.17

− 0.72

0.49

1, 51.58

− 1.61

0.11

2, 49.31

3.35

0.002

Leaf litter

1, 10.26

0.59

0.57

1, 51.86

− 0.16

0.87

2, 49.38

− 2.13

0.04

Mud

1, 9.16

0.21

0.84

1, 51.41

− 0.69

0.49

2, 48.37

0.08

0.94

Rock

1, 12.58

− 1.16

0.27

1, 53.25

2.49

0.02

2, 51.34

− 2.07

0.04

Water

1, 14.40

1.97

0.07

1, 51.92

− 0.22

0.82

2, 53.20

0.58

0.56

Wood

1, 14.47

− 0.03

0.98

1, 53.14

1.18

0.25

2, 52.93

− 2.04

0.05

Other

§§

Number of stems

 

− 1.55

0.12

 

− 1.74

0.08

 

1.15

0.25

§§

Number of trunks

 

− 3.24

0.001

 

− 1.40

0.16

 

− 0.08

0.94

Toad percent visible

1, 15.09

− 0.92

0.37

1, 53.17

− 0.99

0.33

2, 52.21

− 0.20

0.84

Refuge temperature

1, 9.26

− 1.17

0.27

1, 51.72

− 0.62

0.54

2, 48.24

2.70

0.01

Telemetry

Change in shelter sites

1, 13.62

− 0.09

0.93

1, 52.74

− 2.28

0.03

2, 52.12

1.16

0.25

Distance since previous day

1, 12.37

− 0.90

0.39

1, 51.64

− 2.46

0.02

2, 48.90

1.26

0.22

Maximum distance in a day

1, 12.89

− 0.25

0.81

1, 52.91

− 1.84

0.07

2, 51.85

1.47

0.15

Mean displacement per day

1, 12.54

− 0.55

0.59

1, 52.96

− 1.94

0.06

2, 52.24

1.58

0.12

Path straightness

1, 7.70

− 0.73

0.49

1, 28.59

− 0.55

0.59

2, 40.63

0.72

0.47

Total displacement

1, 12.47

− 0.59

0.57

1, 52.98

− 1.94

0.06

2, 51.30

1.59

0.12

Total distance

1, 12.67

− 0.25

0.81

1, 52.98

− 1.92

0.06

2, 51.66

1.32

0.19

  1. Data on morphology were collected from 481 fully dissected toads and 1443 partially dissected cane toads; data on diet were collected from > 481 dissected cane toads. Radio-tracking data on movements and habitat were collected from 57 cane toads, each of which was tracked for 5 days. Bold font indicates significant values (P < 0.05).
  2. Indicates a normal distribution (Z and χ2 values).
  3. §Indicates a poisson distribution (T and F values).
  4. §§Indicates a negative binomial distribution (Z and χ2 values).