Age-0 yellow perch density (#/ha)
Year
Month
Preservation
18 mm
Trawl
Seine
Pelagic End Member
Mean (SD)
Taxonomic
Groups*
Benthic End Member
Mean (SD)
Taxonomic
Groups*
Individual-level
Population-level
Offshore
Inshore % Benthic % Benthic
% Benthic % Benthic (a in = 0.25) (a in = 0.43)
1965
July
Formaldehyde 154110
26662
8231 -31.99 (0.86) b,d,e,f,i,m -27.46 (1.55)
a,d
0.2
81.3
7.8
15.5
1965
August Formaldehyde
12392
1652 -29.68 (0.97) a,e,f,m -24.49 (0.33)
a,d,i
0.6
39.9
2.3
4.2
1966
July
Formaldehyde 44220
25725
4693 -32.29 (0.48) b,d,e,f
-25.17 (1.58)
a,d,h
17.0
46.4
18.7
20.6
1966
August Formaldehyde
4602
1639 -31.60 (0.29) a,b,d,e,f -24.86 (0.67)
a,d,l,m
2.4
42.9
6.7
11.0
1967
July
Formaldehyde 67320
40025
5970 -30.16 (0.63) a,d,e,f,m -25.23 (3.32)
a,h,l
7.1
2.7
6.9
6.6
1967
August Formaldehyde
14457
4326 -30.37 (0.83)
a,d,e,f
-24.59 (-)
a
7.5
37.3
10.2
13.0
1970
July
Formaldehyde 88000
25066
14313 -30.40 (0.99) a,d,e,f,h -24.41 (1.32)
a,d,h,l
-2.8
43.8
4.7
11.2
1970
August Formaldehyde
7369
4809 -30.42 (0.64)
a,e,f
-25.40 (1.08) a,d,e,g,h
10.0
55.5
18.1
25.0
2007
July
Frozen
138760
13368
9748 -32.83 (1.71)
a,d,e,f
-23.34 (1.52)
a,d,l
13.4
66.8
23.8
32.3
2007
August
Frozen
6805
6853 -32.20 (1.03)
a,e,f,j
-23.29 (0.91) a,d,e,h,i,k,l
18.1
93.8
37.1
50.8
2008
July
Frozen
67680
2007
20923 -32.30 (0.81)
e,f
-24.93 (1.00) a,d,h,i,l,m
8.4
80.0
64.0
71.9
2008
August
Frozen
634
4501 -31.02 (0.44)
d,e,f
-23.05 (1.24) a,c,d,e,h,i,l,m
7.9
78.9
57.8
67.8
2009
July
Frozen
125621
5257
8896 -32.64 (0.67)
a,e,f
-23.05 (1.00)
a,d,f,i
4.2
77.0
30.4
45.0
2009
August
Frozen
3126
6405 -30.28 (0.58)
a,e,f,l
-22.51 (0.81)
a,d,f,k,l
-2.6
78.2
30.2
46.5
2011
July
Frozen
4713
519
2784 -32.70 (1.11)
a,e
-25.32 (1.16)
a,d
7.1
76.9
51.9
63.1
2011
August
Frozen
164
1115 -30.25 (0.79) a,d,e,m -23.06 (1.53)
a,d,m
7.5
78.2
56.6
66.7
* - Taxonomic groups from diets included in pelagic and benthic end member calculations are indicated with the following letters: a - amphipod, b - bosmina, c - chaoborus,
d - chironomid larvae, e - cladoceran, f - copepod, g - corixidae, h - ephemeroptera, i - isopod, j - leptodora, k - chironomid pupae, l - tricopterans, m - zooplankton.
Table S1. Summary Table of Samples and Analyses by Month/Year
Month/year sampled, preservation technique, age-0 yellow perch density (18 mm, trawl, seine),
mean pelagic and benthic end member values (mean ± 1 SD) and taxonomic groups used in
calculations, individual-level percent benthic reliance for demersal and littoral age-0 yellow perch,
and population level percent benthic reliance of age-0 yellow perch at in = 0.25 and 0.43.
Taxonomic Groups
Year
Month n Length (mm) Cladocerans Copepods Amphipods Chironomids Trichoptera Isopod Zooplankton Other*
Offshore
1965
July
18
36.7 (2.4)
25.6
6.9
0.1
0.2
0.0
0.3
12.0
0.0
1965 August 20
48 (4.9)
29.7
7.5
0.3
0.0
0.0
0.0
287.3
0.0
1966
July
21
36.3 (4.4)
26.5
0.8
0.0
0.0
0.0
0.0
0.0
0.1
1966 August 19
57.4 (4.8)
19.2
14.6
0.3
0.2
0.0
0.0
1.9
0.8
1967
July
20
41.0 (2.5)
33.0
39.1
0.2
0.4
0.0
0.0
0.5
0.0
1967 August 15
55.5 (5.0)
60.2
12.9
0.2
0.3
0.0
0.0
3.3
0.0
1970
July
18
43.0 (5.2)
63.9
0.5
0.6
0.1
0.0
0.0
0.0
0.1
1970 August 20
55.3 (6.3)
20.2
4.1
1.8
0.1
0.0
0.0
0.0
0.0
2007
July
20
48.0 (5.5)
48.1
41.1
0.4
1.4
0.0
0.0
0.0
16.0
2007 August 32
62.9 (8.8)
391.4
43.3
0.3
0.1
0.0
0.0
0.8
0.0
2008
July
19
51.6 (4.0)
35.0
69.4
0.0
0.2
0.0
0.0
0.2
0.0
2008 August 26
60.3 (6.0)
8.8
69.4
0.1
0.2
0.0
0.0
0.4
0.0
2009
July
21
48.8 (3.0)
27.7
19.8
0.0
0.0
0.0
0.0
0.2
0.0
2009 August 21
65.2 (5.9)
73.7
14.4
6.3
0.0
0.1
0.0
0.2
0.0
2011
July
20
55.6 (4.4)
82.9
5.4
0.2
0.0
0.0
0.0
0.3
0.1
2011 August 20
62.7 (5.5)
9.0
2.7
0.8
10.4
0.1
0.1
21.6
0.2
Inshore
1965
July
20
41.3 (5.5)
0.0
0.0
1.2
2.9
0.0
0.0
8.5
0.0
1965 August 20
49.1 (6.6)
0.0
0.4
11.3
1.1
0.0
0.1
50.0
0.0
1966
July
22
44.0 (5.7)
23.9
1.6
2.5
0.3
0.0
0.0
81.1
0.1
1966 August 20
54.6 (6.5)
37.8
0.0
2.6
0.2
0.1
0.0
23.3
0.1
1967
July
18
36.6 (1.4)
0.8
0.8
2.2
0.6
0.2
0.0
0.0
0.2
1967 August 22
48.6 (4.5)
26.9
0.0
1.7
0.6
0.0
0.0
0.0
0.0
1970
July
20
46.2 (6.4)
64.3
0.1
3.3
2.8
0.1
0.0
0.0
0.2
1970 August 20
58.6 (5.8)
9.3
0.0
3.5
1.7
0.0
0.0
18.1
0.1
2007
July
20
50.0 (6.4)
1.4
2.4
2.6
0.8
2.0
0.0
0.4
0.4
2007 August 25
62.2 (8.0)
11.4
11.4
9.0
1.5
0.2
0.1
0.0
0.1
2008
July
20
52.8 (6.1)
0.2
0.2
4.0
5.6
0.3
0.1
0.0
0.0
2008 August 28 66.6 (10.3)
0.0
1.4
5.5
1.7
1.9
0.0
3.1
0.3
2009
July
21
50.4 (4.9)
7.2
23.2
2.6
0.9
0.4
0.1
14.2
2.0
2009 August 20
66.3 (8.4)
0.9
5.3
5.9
3.0
0.2
0.0
0.3
0.0
2011
July
20
54.9 (3.8)
2.6
9.0
3.4
5.0
0.6
0.0
0.2
0.9
2011 August 20
68.7 (6.2)
9.5
5.7
5.5
4.1
0.5
0.0
0.3
0.3
* - Taxonomic groups represented in other category include: clams, corixidae, eggs, ephemeroptera, hemiptera ,mites, and snails.
Table S2. Summary of Diet Composition for Demersal and Littoral Age-0 Yellow Perch
Sample size, mean length (± 1 SD), and mean number of items observed in diets of age-0 yellow
perch for each month/year combination. Only the dominant taxonomic groups observed are
included (represent >99% of all diet items).