Appendix S2. Abundance and biomass of spider communities from nocturnal and
diurnal surveys
NOCTURNAL SURVEYS
Results of nocturnal surveys (see methods in the main text) for abundance and biomass
of spider families living upon vegetation and ground (leaf litter), between control and
exclusion treatments.
Table 1. Result of generalized linear mixed effects models (GLMMs) testing the effects
of allochthonous aquatic resources on the abundance and biomass of the main predatory
spider families living upon vegetation and ground (nocturnal surveys).
Abundance
Biomass
z
P
z
P
Anyphaenidae
-1.97
0.048
-1.12
0.262
Araneidae
-1.97
0.048
-2.58
0.009
Sparassidae
-0.236
0.814
-1.16
0.247
Theridiidae
-2.13
0.033
-2.59
0.009
Araneidae
0
0.999
-
-
Ctenidae
-1.91
0.057
-1.96
0.050
Pisauridae
-0.52
0.602
-1.09
0.270
Theridiidae
-1.35
0.180
-
-
Main predators
Vegetation
Ground
DIURNAL SURVEYS
Results of diurnal surveys (see methods in the main text) for abundance and biomass of
spider families living upon vegetation and ground (leaf litter), between control and
exclusion treatments. Several analyses were not run because of zero inflated datasets.
Table 2. Result of generalized linear mixed effects models (GLMMs) testing the effects
of allochthonous aquatic resources on the abundance and biomass of the main predatory
spider families living upon vegetation (diurnal surveys).
Abundance
Biomass
z
P
z
P
Anyphaenidae
-0.21
0.840
-
-
Araneidae
0.90
0.37
-
-
Salticidae
-1.34
0.180
-
-
Theridiidae
1.44
0.149
-
-
Salticidae
-
-
-
-
Carabidae
-
-
-
-
Pseudoscorpiones
-
-
-
-
Main predators
Vegetation
Ground
A
Mean abundance (No. indiv./g)
0.3
Control
Exclusion
0.2
0.1
0.0
Anyphaenidae
Araneidae
Salticidae
Theridiidae
B
Mean abundance (No. indiv./g)
0.04
0.03
0.02
0.01
0.00
Salticidae
Carabidae
Pseudoscorpiones
Fig. 1. Mean abundance (± SE) of each predatory family living upon vegetation (A) and
ground (B) between control and exclusion treatments. * significant difference at α<0.05
(GLMM); ns or blank: non-significant difference.
A
Mean biomass (mg/g foliage)
0.5
Control
Exclusion
0.4
0.3
0.2
0.1
0.0
Anyphaenidae
Araneidae
Salticidae
Theridiidae
B
Mean biomass (mg/g leaf letter)
0.015
0.010
0.005
0.000
Salticidae
Carabidae
Pseudoscorpionida
Fig. 2. Mean biomass (± SE) of each predatory family living upon vegetation (A) and
ground (B) between control and exclusion treatments. * significant difference at α<0.05
(GLMM); ns or blank: non-significant difference.