Identification

Title

Zooplankton abundance data derived from the Plankton Imager system from the Western English Channel and Eastern Irish Sea from 2016 to 2019

Alternative title(s)

DC006 zooplankton data

Abstract

These data are abundances (in numbers per meters cubed) of zooplankton taxa, calculated from the analysis of images taken using the Plankton Imager system also included are station positions and sampling date / times. The images where collected using the PI (formerly known as Plankton Image Analyser (PIA)), during the PELTIC (Pelagic ecosystem in the western English Channel and eastern Celtic Sea) surveys from 2016 to 2019, on board the RV Cefas Endeavour. Zooplankton samples and images were collected during night hours only at stations which were selected to match the collection of other environmental parameters.

Resource type

dataset

Resource locator

https://data.cefas.co.uk/view/20507

name: Cefas Data Portal

description: The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: CSV, ESRI Shapefile. The data can also be accessed via the WFS and WMS protocols.

function: download

Unique resource identifier

code

CEFAS20507

codeSpace

https://data.cefas.co.uk

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

biota

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

revision

effective date

2010-05-18

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2012-01-11

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2012-01-11

Geographic location

West bounding longitude

-10.00

East bounding longitude

-2.00

North bounding latitude

52.50

South bounding latitude

48.00

Temporal reference

Temporal extent

Begin position

2016-10-06

End position

2019-10-07

Dataset reference date

date type

publication

effective date

2020-04-20

date type

revision

effective date

2024-07-24

date type

creation

effective date

2020-04-20

Frequency of update

notPlanned

Quality and validity

Lineage

The Plankton Imager is a high-speed colour line scan-based imaging instrument connected to the ships water supply and can take images of all zooplankton of size above 20 microns passing through a cell at a 27 litre per minute flow rate. The flow cell is 25mm brass tube that has two quartz optical windows halfway along its length. The flow cell at the windows is square, with the same cross-sectional area as the 25mm tube. A Basler 2048-70kc camera, sampling at 70K lines per second, images the water running through the flow cell. The flow rate is monitored by a Bell electro-magnetic flow meter. Colour images are captured using an EPIX E4 frame store. RGB composite images are constructed by joining consecutive lines together, thresholding and extracting a region of interest ROI, or vignette, that is saved to hard drive as a TIF file. Raw images are stored to maximize dynamic range of the captured particles. These are converted to 8-bit resolution through a process of scaling and conversion from 12 to 8-bit resolution, for viewing and for subsequent processing. Due to operational requirements (continuous image processing while maintaining manageable file-size), only those particles within the mesozooplankton range 200 microns – 2cm were processed and saved. In order to reproduce the sub-sampling procedure used for physical samples (as collected with a ring net), random images were extracted until each sample contained approximately 200 mesozooplankton individuals and then identified using the with the Plankton Imager software to derive taxon groupings which were then validated by an expert taxonomist manually. The following paper describes the Plankton Imager system in further detail. Pitois *et al.* (2018). Comparison of a Cost-Effective Integrated Plankton Sampling and Imaging Instrument with Traditional Systems for Mesozooplankton Sampling in the Celtic Sea. Frontiers in Marine Science. 5. 10.3389/fmars.2018.00005.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2013-12-10

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

true

explanation

See the referenced specification

Data format

name of format

Unknown

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

Responsible organisations

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

originator

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

custodian

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

distributor

Responsible party

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

email address

data.manager@cefas.co.uk

responsible party role

owner

Metadata on metadata

Metadata point of contact

organisation name

Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2024-07-24T11:35:12

Metadata language