Supplementary Online Information for
Do intraspecific or interspecific interactions determine responses to
predators feeding on a shared size-structured prey community?
Hanna ten Brink1,2, Mazumdar Abul Kalam Azad1, Joseph Huddart1, Lennart Persson1 &
Tom C. Cameron*1,3
1
Ecology & Environmental Sciences, Umeå University, Umeå, Sweden, 90742
2 present address
Institute for Biodiversity and Ecosystem Dynamics (IBED), University of Amsterdam,
P.O. Box 94248, 1090 GB Amsterdam, The Netherlands
3
School of Biological Sciences, University of Essex, Colchester, UK, CO4 3SQ
* tcameron@essex.ac.uk
Contents:
Table S1: Breakdown of model selection and Akaike weights for Bythotrephes abundance
Table S2: Breakdown of model selection and Akaike weights for Holopedium analysis
Figure S1: Full time series of prey size frequency histogram per predator treatment
Figure S2: Full time series of small and large prey biomass per predator treatment
Figure S3: Full time series of total zooplankton biomass per predator treatment
Table S1: Breakdown of the apriori selected candidate models for numbers of Bythotrephes per
mesocosm containing dependent variables for predator treatment (Bythotrephes alone, Young-Of Year
perch (YOY) alone, YOY + Bythotrephes and One-Year-Old perch (OYO) + Bythotrephes) and week
of the experiment (weeks 3-7).
Fixed effects
df
AIC values
AIC Weights
Treatment+Week+(Treatment:Week)
16
0
0.997
Week
6
12.9
0.0016
Treatment+Week
8
13
0.0014
Treatment
4
162.3
0
Table S2: Breakdown of the apriori selected candidate models for the biomass per litre epilimnion of
juvenile and adult Holopedium and the proportion of fecund Holopedium per mesocosm containing
dependent variables for predator treatment (Bythotrephes alone, Young-Of Year perch (YOY) alone,
YOY + Bythotrephes and One-Year-Old perch (OYO) + Bythotrephes) and week of the experiment
(weeks 2-5).
Juvenile Holopedium
biomass
Adults Holopedium
biomass
Proportion fecund
Holopedium
Fixed effects
df
dAIC
Weights
dAIC
Weights
dAIC
Weights
Treatment+Week+(T
reatment:Week)
18
0
0.997
0
0.999
0
1
Treatment+Week
9
11.9
0.0026
22.7
0.00001
35.7
0
Week
6
23.5
0
21.6
0.00001
67.4
0
Treatment
6
505.4
0
83.5
0
50.7
0
Figure S1: (LANDSCAPE) Full time series of size structure of the zooplankton prey community as
the size frequency histogram of individuals per predator treatment per week.
Figure S2: (LANDSCAPE) Full time series of size structure of the zooplankton prey community as
the mean total biomass of large (>0.75mm) or small (≤0.75mm) individuals per predator treatment per
week. Error bars on biomass plots are bias corrected and adjusted bootstrapped 95%
confidence intervals of the mean (n=1000).
Figure S3. Full time series of mean total zooplankton biomass per mesocosm per predator treatment
for each week of the study. Error bars on biomass plots are bias corrected and adjusted
bootstrapped 95% confidence intervals of the mean (n=1000).