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Metadata: Meso and macrozooplankton abundance in the Bristol Channel, Celtic Sea and English Channel 2017-2023
Abstract:
Mesozooplankton (down to ~300µm size) and macrozooplankton abundance data gathered as part of an ongoing annual autumn pelagic survey in the English Channel, Celtic Sea and Bristol Channel, with data currently available from 2017-2022. Samples were obtained using twin ringnet deployments at set stations and subsequently processed back at the lab using ZooScan image analysis. Count abundances from semi-automatic image classifications on EcoTaxa are then converted into abundances per m3 using estimates of filtered volume from flowmeter readings. The current dataset comprises zooplankton results specifically from the PELTIC (Integrated Pelagic ecosystem survey in the Western Channel and Celtic Sea) survey series, which has expanded the collection of pelagic data from the core regions sampled in the POSEIDON survey series which ran between 2012-2016.
Data holder:
Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS)
| Other details | ||
| Internal code | Internally assigned metadata identifier | 9100 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Meso and macrozooplankton abundance in the Bristol Channel, Celtic Sea and English Channel 2017-2023 |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | CEFAS0fd3bb0e-876c-4ab9-81dd-ee0afeb10ada |
| Resource Identifier | This is the code assigned by the data owner. | CEFAS21495 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2017-09-25 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2023-03-17 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Mesozooplankton (down to ~300µm size) and macrozooplankton abundance data gathered as part of an ongoing annual autumn pelagic survey in the English Channel, Celtic Sea and Bristol Channel, with data currently available from 2017-2022. Samples were obtained using twin ringnet deployments at set stations and subsequently processed back at the lab using ZooScan image analysis. Count abundances from semi-automatic image classifications on EcoTaxa are then converted into abundances per m3 using estimates of filtered volume from flowmeter readings. The current dataset comprises zooplankton results specifically from the PELTIC (Integrated Pelagic ecosystem survey in the Western Channel and Celtic Sea) survey series, which has expanded the collection of pelagic data from the core regions sampled in the POSEIDON survey series which ran between 2012-2016. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Since autumn 2017, samples have continued to be collected with twin ringnet deployments and KC flowmeter attachments onboard the RV Cefas Endeavour, with image analysis conducted on those obtained using an 80µm ringnet of 0.5m diameter. Deployments are made at set station locations along transect lines which continue to span the area between the Bristol Channel to the south of Wales and eastern Celtic Sea to the western side of the English Channel. In addition to this, the surveys expanded their focus from purely UK territorial waters around the Cornish Peninsula to include French waters off the western English Channel. In 2020, this was extended further to include Cardigan Bay to the west of Wales. The transect lines stations have been located within have been designed with their spacing and orientation across the prevailing bathymetry of the area. In autumn 2022, a restricted survey period meant that only the English Channel area was sampled and a subsequent survey took place in March 2023 which focused on the Cardigan Bay area (CEND 3b/23). Preserved samples were sent back to the Plankton Lab at the Cefas Lowestoft Laboratory and thereafter prepped for imaging using ZooScan. A minimum threshold of 200 zooplankton specimens were aimed for in the images where possible from each sample, with rescans conducted as necessary. Object images processed from the sample were subsequently imported into the project image library within the EcoTaxa web application. For samples obtained in the CEND 3b/23 survey in March 2023, the method was altered so that samples were separated into a 1mm+ size fraction (d1) and 80µm-1mm size fraction (d2). Both the d1 and d2 components were separately diluted if necessary and imaged as above, to enable a more accurate representation of larger and rarer zooplankton taxa. Once uploaded into EcoTaxa, scanned objects from each sample were predicted into taxa categories with the provision of a learning set to aid automatic image sorting using Random Forest algorithms. These predicted classifications were validated afterward by an experienced zooplankton taxonomist and the metadata downloaded with the taxa counts. Filtered volume estimates were obtained based on calculations using flowmeter rotor revolution counts recorded for each station. Objects captured in images were separated into zooplankton taxa and detritus groups and abundances estimated in terms of per m3, using counts and filtered volume and raising factor calculations based on the sample fractions used. An agreed subset of the data may be selected for quality control checks by a second experienced taxonomist, ensuring quality control in the image classifications. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zooplankton |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Plankton | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Taxonomy | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Plankton abundance per unit volume of the water column | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Water column | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | data.gov.uk | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 52.5 |
| East | The eastern-most limit of the data resource in decimal degrees | 2 |
| South | The southern-most limit of the data resource in decimal degrees | 48.5 |
| West | The western-most limit of the data resource in decimal degrees | -8 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) | |
| Delivery point | Cefas Lowestoft Laboratory, Pakefield Road | |
| Postal code | NR33 0HT | |
| City | Lowestoft | |
| Administrative area | Suffolk | |
| Country | UK | |
| data.manager@cefas.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Department for Environment, Food and Rural Affairs (DEFRA) | |
| defra.helpline@defra.gov.uk | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://data.cefas.co.uk/view/21495 |
| Locator name | Name of the web resource | Cefas Data Portal |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | noLimitations | |
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | http://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_RestrictionCode | |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2022-08-25 |
| Date of last revision | The most recent date that the resource was revised. | 2026-02-11 |
| Date of creation | The date that the resource was created. | 2022-08-03 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-02-11 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.1 |