Ecological Archives E085-038-A3

Nico Blüthgen and Konrad Fiedler. 2004. Competition for composition: lessons from nectar-feeding ant communities. Ecology 85:1479–1485.

Appendix C. Multiple linear regression models for foraging patterns of 16 ant species.

Stepwise forward multiple linear regression analysis (with ridge correction, k = 0.1) modeling the explanatory power of four nectar characteristics to explain foraging intensity of 16 ant species at natural food sources. We present standardized regression coefficients b, their respective T- and p-values for included predictor variables (where F > 1.0) and the summary statistics of each regression model with adjusted coefficient of multiple determination (Ra2). Where all variables were excluded from the model, the summary statistics of the standard model are given. Significant models are in bold.

 

Anonychmyrma gilberti (Forel)

Camponotus vitreus (Smith)

Crematogaster cf. fusca Smith

Crematogaster cf. pythia Forel

Leptomyrmex unicolor Emery

Monomorium floricola Forel

Oecophylla smaragdina (Fabricius)

Factor

T

P

T

P

T

P

T

P

T

P

T

P

T

P

(1)

Amino acid profiles (NMDS)

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.31

1.6

0.11

(2)

Total amino acid concentration (g/L)

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

0.27

1.4

0.17

(3)

Sucrose/(sucrose+hexose)

-0.18

-1.1

0.29

-

-

-

-

-

-

-

-

-

0.30

1.8

0.08

-

-

-

-

-

-

(4)

Total sugar concentration (g/L)

-

-

-

-

-

-

-0.22

-1.3

0.20

-

-

-

-

-

-

-0.17

-1.0

0.31

0.17

1.0

0.32

Whole regression model

Ra2= 0.005
F1, 30 = 1.1
P = 0.29

Ra2= 0.07
F4, 27 = 0.4
P = 0.78

Ra2= 0.02
F1, 30 = 1.7
P = 0.20

Ra2= 0.11
F4, 27 = 0.2
P = 0.92

Ra2= 0.07
F1, 30 = 3.2
P = 0.08

Ra2= 0.002,
F1, 30 = 1.1
P = 0.31

Ra2= 0.26
F3, 28 = 4.6
P < 0.01

 

 

Paratrechina vaga (Forel)

Pheidole platypus Crawley

Rhoptromyrmex wroughtonii Forel

Polyrhachis (Cyrtomyrma) sp."NB5041"

Polyrhachis (Myrma) foreli Kohout

Tetramorium validiusculum Emery

Tapinoma melanocephalum (Fabricius)

Technomyrmex albipes (Smith)

Turneria bidentata Forel

Factor

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

T

P

(1)

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

(2)

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

-

(3)

-0.24

-1.5

0.15

-0.19

-1.2

0.25

-0.21

-1.2

0.22

-0.35

-2.1

0.04

-

-

-

-0.29

-1.8

0.08

-0.28

-1.7

0.10

-

-

-

-

-

-

(4)

-0.28

-1.8

0.09

-0.34

-2.1

0.045

-0.18

-1.1

0.30

-

-

-

-

-

-

-0.25

-1.5

0.13

-

-

-

-

-

-

-

-

-

Whole

Ra2= 0.12
F2, 29 = 3.1
P = 0.06

Ra2= 0.13
F2, 29 = 3.3
P = 0.0503

Ra2= 0.03
F2, 29 = 1.6
P = 0.23

Ra2= 0.10
F1, 30 = 4.6
P = 0.04

Ra2= 0.11
F4, 27 = 0.3
P = 0.90

Ra2= 0.13
F2, 29 =3.3
P = 0.0497

Ra2= 0.05
F1, 30 = 2.8
P = 0.10

Ra2= 0.12
F4, 27 = 0.2
P = 0.96

Ra2= 0.12
F4, 27 = 0.2
P = 0.94


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