The following supplement accompanies the article
Environmental drivers of the fine-scale distribution of a
gelatinous zooplankton community
across a mesoscale front
Jessica Y. Luo1,*, Benjamin Grassian1, Dorothy Tang1, Jean-Olivier Irisson2,
Adam T. Greer1,3, Cedric M. Guigand1, Sam McClatchie4, Robert K. Cowen1,5
1
Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker
Causeway, Miami, Florida 33149, USA
2
Ocean Observatory of Villefranche-sur-Mer, University of Pierre and Marie Curie, 181 Chemin du Lazaret, 06230 Villefranchesur-Mer, France
3
College of Engineering, University of Georgia, 200 D.W. Brooks Dr., Athens, Georgia 30602, USA
4
Southwest Fisheries Science Center, NOAA Fisheries, 8901 La Jolla Shores Drive, La Jolla, California 92037, USA
5
Hatfield Marine Science Center, Oregon State University, 2030 SE Marine Science Drive, Newport, Oregon 97365, USA
*Corresponding author: jessica.luo@rsmas.miami.edu
Marine Ecology Progress Series 510: 129–149 (2014)
Supplement
Additional data and analyses from a gelatinous zooplankton community distribution study using the in
Situ Ichthyoplankton Imaging System (ISIIS) at a meso-scale front in the Southern California Bight
(SCB). Table S1 gives species distribution model inputs and outputs, created by boosted regression
trees, for 17 dominant taxa. Figs. S1–S3 show interpolated environmental variables (temperature,
fluorometry, and oxygen, respectively) over the study site in the SCB. Fig. S4 shows the distribution
and concentration of a hydromedusa, Liriope tetraphylla, across the study site.
Table S1. Boosted regression tree (BRT) model inputs and outputs for all 17 taxa modeled. Columns
show the shrinkage rate (also referred to as learning rate), the total number of trees used in the best
model, the pseudo-R2 values, and the relative influence of each explanatory variable. The variable with
the highest relative influence for each model is in bold
Relative influence of explanatory variables (%)
Shrinkage
rate
# trees
Pegantha sp.
0.001
Appendicularians
R2
Depth
Temp.
Oxygen
Chl a
Salinity
Front
6131
0.39
14.14
26.92
4.92
26.62
17.95
9.46
0.005
7512
0.57
45.29
24.33
9.07
11.54
8.9
0.87
0.0075
9976
0.74
23.39
30.3
8.46
16.59
11.23
10.03
0.05
8777
0.93
22.52
28.55
11.11
15.07
10.35
12.4
Very small hydromedusae (vsh)
0.015
9864
0.91
30.49
29.67
8.64
13.2
11.58
6.41
Solmundella bitentaculata
0.003
9020
0.53
14.95
30.1
11.41
18.5
14.76
10.29
0.03
7993
0.78
22.32
21.88
12.22
20.78
16.64
6.16
0.0075
7344
0.77
11.85
14.07
25.7
34.98
9.64
3.75
Hormiphora californiensis
0.001
6015
0.13
18.23
26.91
11.55
27.85
10.1
5.36
Agalma elegans
0.003
4425
0.25
12.34
11.47
26.26
30.89
11.16
7.88
Muggiaea atlantica
0.003
8298
0.48
10.48
13.45
19.09
36.85
18.26
1.88
Nanomia bijuga
0.005
8624
0.37
14.72
13.46
28.46
23.57
17.3
2.48
Sphaeronectes sp.
0.005
4651
0.46
18.87
29.22
28.9
9.01
5.78
8.21
Beroida
0.001
9996
0.17
18.57
23.15
20.7
14.38
17.34
5.86
Ocyropsis maculata
0.001
9996
0.22
22.45
17.28
48.17
1.79
6.94
3.36
Diphyidae
0.002
5300
0.16
15.89
21.11
25.39
8.77
27.07
1.77
Solmaris sp.2
0.001
4637
0.14
50.29
19.52
12.01
3.33
7.9
6.95
Taxon
h15
Solmaris rhodoloma
Liriope tetraphylla
Doliolids
2
Fig. S1. Interpolated temperature (°C) profile of the sampled transects in the Southern California Bight
(SCB). Distance (in km) is measured along each transect. Top: Transect 1, middle: Transect 2, lower:
Transect 3. Orange arrows indicate location of front
Fig. S2. Interpolated fluorometry (V), a measure of chl a fluorescence, profile of the sampled transects in
the Southern California Bight (SCB). Distance (in km) is measured along each transect. Top: Transect 1,
middle: Transect 2, lower: Transect 3. Orange arrows indicate location of front
3
Fig. S3. Interpolated dissolved oxygen (ml l-1) profile of the sampled transects in the Southern California
Bight (SCB). Distance (in km) is measured along each transect. Top: Transect 1, middle: Transect 2,
lower: Transect 3. Orange arrows indicate location of front
Liriope tetraphylla
0
50
1
100
Temp (C)
16
14
12
50
2
Depth (m)
0
10
100
Density
25
50
0
75
50
3
100
0
25
50
75
Distance (km)
Fig. S4. Densities of the hydromedusae Liriope tetraphylla plotted on temperature (°C) profile, by
transect (top: Transect 1, middle: Transect 2, lower: Transect 3) in the Southern California Bight (SCB).
Size of bubble indicates concentration of organisms found in a 1 m depth bin. Orange arrow indicates
location of the front. Bars above each panel indicate daylight (white), twilight (gradient) and nighttime
(black). Distance (in km) is measured along each transect
4