Survey 1
|
IBTS Q1
|
IBTS Q1
|
Survey 2
|
IBTS Q3
|
IBTS Q3
|
Metric
|
No Lag
|
1y lag
|
B
|
0.300
|
0.708
|
N
|
0.273
|
0.534
|
P
|
0.356
|
0.755
|
P/B
|
0.189
|
0.824
|
LFI
|
-0.104
|
-0.086
|
W
|
0.488
|
0.836
|
S
|
0.315
|
0.129
|
SMarg
|
0.566
|
0.411
|
J
|
0.256
|
0.478
|
N1
|
0.449
|
0.683
|
N2
|
0.370
|
0.681
|
L∞
|
0.185
|
0.469
|
K
|
0.348
|
0.427
|
Amat
|
0.374
|
0.546
|
Lmat
|
0.031
|
0.693
|
|
|
|
No. years
|
17
|
17
|
Table S1. Pearson correlation coefficients for comparisons between metric time series derived from the International Bottom Trawl Surveys (IBTS) undertaken in the first (Q1) and third (Q3) quarters of the year in the Northern North Sea sub-region. In columns headed 1y lag, a plus one-year lag was introduced to the Q4 survey time series. The row marked “No years” indicates the number of years overlap between the two series in the correlation analysis. Coefficients in bold are statistically significant (P<0.05) in a one-way test (only positive relationships considered significant).
Survey 1
|
IBTS Q1
|
IBTS Q1
|
Survey 2
|
IBTS Q3
|
IBTS Q3
|
Metric
|
No Lag
|
1y lag
|
B
|
0.633
|
0.572
|
N
|
-0.118
|
0.054
|
P
|
0.499
|
0.532
|
P/B
|
0.399
|
0.343
|
LFI
|
0.197
|
0.335
|
W
|
0.064
|
-0.027
|
S
|
-0.228
|
0.522
|
SMarg
|
-0.296
|
0.486
|
J
|
-0.422
|
-0.295
|
N1
|
-0.358
|
-0.147
|
N2
|
-0.249
|
-0.152
|
L∞
|
0.605
|
0.290
|
K
|
-0.096
|
0.268
|
Amat
|
-0.061
|
-0.027
|
Lmat
|
0.528
|
0.372
|
|
|
|
No. years
|
17
|
17
|
Table S2. Pearson correlation coefficients for comparisons between metric time series derived from the International Bottom Trawl Surveys (IBTS) undertaken in the first (Q1) and third (Q3) quarters of the year in the Southern North Sea sub-region. In columns headed 1y lag, a plus one-year lag was introduced to the Q4 survey time series. The row marked “No years” indicates the number of years overlap between the two series in the correlation analysis. Coefficients in bold are statistically significant (P<0.05) in a one-way test (only positive relationships considered significant).
Survey 1
|
ESWBTS Q4
|
ECSGS Q1
|
ECSGS Q1
|
Survey 2
|
FCSGS Q4
|
FCSGS Q4
|
FCSGS Q4
|
Metric
|
No Lag
|
No Lag
|
1y lag
|
B
|
-0.241
|
0.487
|
-0.307
|
N
|
-0.400
|
-0.254
|
-0.549
|
P
|
-0.700
|
0.453
|
0.100
|
P/B
|
0.151
|
-0.011
|
0.744
|
LFI
|
0.697
|
0.426
|
0.719
|
W
|
-0.278
|
0.016
|
-0.317
|
S
|
0.783
|
-0.181
|
0.463
|
SMarg
|
0.631
|
-0.458
|
-0.202
|
J
|
-0.330
|
-0.058
|
-0.487
|
N1
|
-0.117
|
-0.117
|
-0.442
|
N2
|
-0.016
|
0.147
|
-0.652
|
L∞
|
-0.033
|
-0.267
|
-0.119
|
K
|
0.308
|
0.196
|
0.217
|
Amat
|
0.577
|
-0.037
|
0.604
|
Lmat
|
-0.154
|
0.225
|
0.338
|
|
|
|
|
No years
|
5
|
8
|
7
|
Table S3. Pearson correlation coefficients for comparisons between metric time series derived from the French Celtic Sea Groundfish Survey (FCSGS) undertaken in the fourth (Q4) quarter of the year, the English Southwest Bottom Trawl Survey (ESWBTS) undertaken in the fourth (Q4) quarter of the year, and the English Celtic Sea Groundfish Survey (ECSGS) undertaken in the first (Q1) quarter of the year in the Western Channel and Celtic Sea sub-region. In columns headed 1y lag, a plus one-year lag was introduced to the Q4 survey time series. The row marked “No years” indicates the number of years overlap between the two series in the correlation analysis. Coefficients in bold are statistically significant (P<0.05) in a one-way test (only positive relationships considered significant).
Survey 1
|
NIGS Q1
|
NIGS Q1
|
NIGS Q1
|
Survey 2
|
NIGS Q3
|
NIGS Q3
|
SWCGS Q1
|
Metric
|
No Lag
|
1y lag
|
No Lag
|
B
|
0.602
|
0.226
|
0.514
|
N
|
0.463
|
0.295
|
0.751
|
P
|
0.539
|
0.313
|
0.599
|
P/B
|
0.542
|
0.300
|
0.381
|
LFI
|
0.180
|
0.468
|
-0.298
|
W
|
-0.089
|
0.367
|
0.016
|
S
|
-0.190
|
-0.440
|
-0.148
|
SMarg
|
-0.025
|
-0.256
|
-0.148
|
J
|
0.258
|
0.356
|
0.740
|
N1
|
0.320
|
0.339
|
0.717
|
N2
|
0.239
|
0.234
|
0.551
|
L∞
|
0.141
|
0.547
|
0.211
|
K
|
0.136
|
0.586
|
0.806
|
Amat
|
0.236
|
0.341
|
0.725
|
Lmat
|
0.060
|
0.552
|
0.468
|
|
|
|
|
No years
|
16
|
16
|
11
|
Table S4. Pearson correlation coefficients for comparisons between metric time series derived from the Northern Irish Groundfish Survey (NIGS) undertaken in the first (Q1) and third (Q3) quarters of the year and Scottish West Coast Groundfish Survey (FCSGS) undertaken in the first (Q1) quarter of the year in the Irish Sea sub-region. In columns headed 1y lag, a plus one-year lag was introduced to the Q3 survey time series. The row marked “No years” indicates the number of years overlap between the two series in the correlation analysis. Coefficients in bold are statistically significant (P<0.05) in a one-way test (only positive relationships considered significant).
Survey 1
|
SWCGS Q1
|
SWCGS Q1
|
Survey 2
|
SWCGS Q4
|
SWCGS Q4
|
Metric
|
No Lag
|
1y lag
|
B
|
0.323
|
0.715
|
N
|
0.218
|
0.803
|
P
|
0.216
|
0.768
|
P/B
|
0.319
|
0.350
|
LFI
|
0.672
|
0.584
|
W
|
0.003
|
-0.076
|
S
|
-0.494
|
-0.045
|
SMarg
|
-0.138
|
0.466
|
J
|
0.195
|
0.549
|
N1
|
0.334
|
0.631
|
N2
|
0.254
|
0.660
|
L∞
|
0.248
|
0.483
|
K
|
0.273
|
0.529
|
Amat
|
0.197
|
0.538
|
Lmat
|
-0.041
|
0.103
|
|
|
|
No. years
|
10
|
10
|
Table S5. Pearson correlation coefficients for comparisons between metric time series derived from the Scottish West Coast Groundfish Survey (SWCGS) undertaken in the first (Q1) and fourth (Q4) quarters of the year in the Minches and Western Scotland sub-region. In columns headed 1y lag, a plus one-year lag was introduced to the Q4 survey time series. The row marked “No years” indicates the number of years overlap between the two series in the correlation analysis. Coefficients in bold are statistically significant (P<0.05) in a one-way test (only positive relationships considered significant).
Survey 1
|
SWCGS Q1
|
SWCGS Q1
|
Survey 2
|
SWCGS Q4
|
SWCGS Q4
|
Metric
|
No Lag
|
1y lag
|
B
|
0.559
|
0.574
|
N
|
0.330
|
0.268
|
P
|
0.619
|
0.539
|
P/B
|
0.428
|
0.641
|
LFI
|
0.251
|
0.502
|
W
|
0.443
|
0.657
|
S
|
-0.350
|
-0.677
|
SMarg
|
-0.043
|
0.130
|
J
|
0.460
|
0.500
|
N1
|
0.575
|
0.579
|
N2
|
0.488
|
0.661
|
L∞
|
0.242
|
0.376
|
K
|
0.249
|
0.435
|
Amat
|
0.527
|
0.500
|
Lmat
|
0.224
|
0.335
|
|
|
|
No. years
|
10
|
10
|
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