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

S_{Marg}

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

A_{mat}

0.374

0.546

L_{mat}

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 subregion. In columns headed 1y lag, a plus oneyear 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 oneway 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

S_{Marg}

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

A_{mat}

0.061

0.027

L_{mat}

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 subregion. In columns headed 1y lag, a plus oneyear 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 oneway 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

S_{Marg}

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

A_{mat}

0.577

0.037

0.604

L_{mat}

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 subregion. In columns headed 1y lag, a plus oneyear 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 oneway 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

S_{Marg}

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

A_{mat}

0.236

0.341

0.725

L_{mat}

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 subregion. In columns headed 1y lag, a plus oneyear 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 oneway 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

S_{Marg}

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

A_{mat}

0.197

0.538

L_{mat}

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 subregion. In columns headed 1y lag, a plus oneyear 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 oneway 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

S_{Marg}

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

A_{mat}

0.527

0.500

L_{mat}

0.224

0.335




No. years

10

10

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