Date (Creation)

2021-10-18

Date (Revision)

2021-10-18

Date (Publication)

2021-10-18

Date (released)

2021-10-18

Edition

1.0

Unique resource identifier

https://doi.org/10.5285/fc660bc3-09ab-4c1a-9d2a-4026951872c8

Codespace

doi

Unique resource identifier

GB/NERC/BAS/PDC/01575

Codespace

https://data.bas.ac.uk/

Unique resource identifier

NE/P006213/1

Codespace

award

Unique resource identifier

NE/R012687/1

Codespace

award

Other citation details

Please cite this item as: Freer, J., Daase, M., & Tarling, G. (2021). Range-wide occurrence records of the subarctic copepod Calanus finmarchicus and associated environmental predictor variables (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/fc660bc3-09ab-4c1a-9d2a-4026951872c8

Credit

No credit.

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
British Antarctic Survey	Freer, Jennifer J		Author
UiT The Arctic University of Norway	Daase, Malin		Author
British Antarctic Survey	Tarling, Geraint A		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency

As needed

Maintenance note

Completed

Global Change Master Directory (GCMD) Science Keywords

• EARTH SCIENCE > Oceans > Marine Biology > Marine Invertebrates
• EARTH SCIENCE > Oceans > Marine Environment Monitoring

Theme

• Atlantification

• Climate Warming

• Ecological Niche Model

• Zooplankton

Place

• Arctic

• Subarctic

• North Atlantic

GEMET - INSPIRE themes, version 1.0

• Oceanographic geographical features

Access constraints

Other restrictions

Other constraints

no limitations to public access

Access constraints

Other restrictions

Other constraints

no limitations

Use constraints

License

Other constraints

Open Government Licence v3.0

Use constraints

Other restrictions

Other constraints

Data released under Open Government Licence V3.0:

Use constraints

Other restrictions

Other constraints

None.

Unique resource identifier

url

Codespace

url

Association Type

Cross reference

Unique resource identifier

url

Codespace

url

Association Type

dependency

Spatial representation type

Text, table

Language

English

Character set

UTF8

Topic category

• Biota
• Environment
• Oceans

Begin date

1955-01-01

End date

1984-12-31

Supplemental Information

It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk.

Title

European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication)

2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier

urn:ogc:def:crs:EPSG::3031

Version

6.18.3

Hierarchy level

Dataset

Statement

Methodology:

Occurrence records and environmental data were downloaded from online and open access sources (see section Reference). After identifying overlapping datasets between repositories, remaining occurrence records were thinned to retain only one occurrence per season per grid cell (resolution: 0.25° x 0.25°) using the "spThin" R package (Aiello-Lammens et al. 2015). This removes the fewest records necessary to substantially reduce the effects of sampling bias, while simultaneously retaining the greatest amount of useful information. This left a total of 27,727 occurrence records and this cleaned dataset is version provided here.

Occurrence and background points were matched to the conditions from the season and era from which they were collected. This was done using an adapted version of the "depth_extract" R function available from: https://figshare.com/articles/Duffy_Chown_MEPS12011_model_virtualspecies/4315052. The adapted version we use is available in the R Markdown file we provide .

The steps that followed included optimising Maxent model settings, using the final model to predict habitat suitability across the study region, and running several sensitivity analyses. These processes are documented in the R Markdown file provided.

- Folder: env_dat_rasters, Volume: 193 megabytes

Contents: This folder contains the gridded environmental data. Each subfolder contains the raster files (ascii format) for a particular time period (era) and season. E.g. subfolder "era1_amj" contains the raster data during April-May-June of era 1 (1955-1984).

Data files and units:

bathy.asc = bathymetry (metres)

chla.asc = sea surface chlorophyll a concentration (mg.m-3)

par.asc = sea surface photosynthetically active radiation (einstein.m-2.day-1)

ph.asc = sea surface ph (total scale)

salinity.asc = sea surface salinity (psu)

seaicecon.asc = sea-ice concentration (%)

silicate.asc = sea surface molar concentration of silicate (µmol.kg-1)

slope.asc = bathymetric slope (degrees)

temp.asc = sea surface temperature (degrees celsius)

velocity.asc = sea surface current velocity (m.s-1)

- File: occurrence_dat_cleaned.csv, Volume: 4.9 megabytes

Contents: This file contains the cleaned and processed occurrence records of Calanus finmarchicus and the season-and-era-specific environmental conditions assigned to each presence locality.

Data columns and units:

NAME = identifier for species "Calanus_finmarchicus"

LON = longitude (decimal degrees)

LAT = latitude (decimal degrees)

MONTH_COLLECTED = month of sample collection (1=Jan, 2=Feb etc.)

SEASON = season assigned to each point (1=Jan-Feb-Mar, 2=Apr-May-Jun, 3=Jul-Aug-Sep, 4=Oct-Nov-Dec)

MINIMUM_DEPTH = minimum vertical depth of sample (metres from sea surface)

MAXIMUM_DEPTH = maximum vertical depth of sample (metres from sea surface)

MIN_MAX_DEPTH_RANGE = vertical range of sample (metres)

YEAR_COLLECTED = year of sample collection

TIME_PERIOD = era assigned to each point (1=1955-1984, 2=1985-2017)

LIFESTAGE = copepodite life stage assigned to the record at collection (CI-Adult)

DATASET = dataset/cruise from which sample was collected (see file "occurrence_dat_citations.txt" for full list)

DATABASE = database from which sample was archived (see file "occurrence_dat_citations.txt" for full list)

BATHY = bathymetry (metres)

CHLA = sea surface chlorophyll a concentration (mg.m-3)

PAR = sea surface photosynthetically active radiation (einstein.m-2.day-1)

PH = sea surface pH (total scale)

SALINITY = sea surface salinity (psu)

SEAICECON = Sea-ice concentration (%)

SILICATE = sea surface molar concentration of silicate (µmol.kg-1)

SLOPE = Bathymetric slope (degrees)

TEMP = sea surface temperature (degrees Celsius)

VELOCITY = sea surface current velocity (m.s-1)

Abbreviations:

CI - CVI = lifestage Copepodite I - VI, w...(42)

Data collection:

All analyses were carried out in R version 3.4.1.

Data quality:

Occurrence records represent those remaining after undertaking quality assurance and control processes as detailed in section 6. Further actions to limit the potential for sampling bias issues were carried out and are included in the R Markdown file we provide.

Due to limited data availability, seasonal environmental data during the older time period (1955-1984) are limited to: bathymetry, slope, temperature, salinity, sea-ice concentration and current velocity.

Sensitivity analyses were carried out to (a) account for potential misidentification of occurrences between Calanus finmarchicus and its congener, C. glacialis, (b) account for potential bias stemming from the seasonal assignment process of occurrences to environmental, and (c) test the sensitivity of model outputs to the inclusion of sea-ice concentration. Code for these analyses is within the R Markdown file we provide.

Metadata

File identifier

fc660bc3-09ab-4c1a-9d2a-4026951872c8 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Hierarchy level name

dataset

Date stamp

2021-10-18

Metadata standard name

ISO 19115 Geographic Information - Metadata

Metadata standard version

ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact