Identification

Title

2013 - 2014 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Phytoplankton abundance data for Spring and Autumn of 2018 in the Celtic Sea

Abstract

Phytoplankton abundance data collected on the RV Cefas Endeavour as part of CEND05_18 and CEND17_18, CEND03_19 and CEND04_19. Samples were collected for use in eutrophication assessments and to test the Ferrybox water sampler. These samples were analysed at CEFAS. Samples were collected using three different methods: ( 1.)Manually from a rosette. ( 2.)Manually from the continuous flow. ( 3.)Automatically with a water sampler attached to the Ferrybox.

Resource type

dataset

Resource locator

Unique resource identifier

code

CEFAS697e2edd-c5c3-4d89-b84c-f8e5e7c62586

codeSpace

http://www.cefas.co.uk/

Dataset language

eng

Spatial reference system

authority code

OGP

code identifying the spatial reference system

urn:ogc:def:crs:EPSG::4326

Classification of spatial data and services

Topic category

Keywords

Keyword set

keyword value

Keyword set

keyword value

originating controlled vocabulary

title

SeaDataNet P021 parameter discovery vocabulary

reference date

date type

revision

effective date

2011-03-25

Keyword set

keyword value

originating controlled vocabulary

title

GEMET, version 1.0

reference date

date type

publication

effective date

2008-06-01

Geographic location

West bounding longitude

1.73881

East bounding longitude

1.74086

North bounding latitude

52.4595

South bounding latitude

52.4581

Extent

Extent group

authority code

title

SeaVoX Vertical Co-ordinate Coverages

reference date

date type

revision

effective date

2010-05-18

code identifying the extent

Temporal reference

Temporal extent

Begin position

2013-10-12

End position

2014-11-01

Dataset reference date

date type

publication

effective date

2021-07-08

Frequency of update

notPlanned

Quality and validity

Lineage

Sample collection methods: ( 1.)Samples were collected from Niskin bottles fired at depth, transferred into a 500 ml container and fixed with 2-3 ml of 25% acidified Lugol's iodine solution. ( 2.)Samples were collected from the continuous flow ferrybox water supply (approx. 4m water depth) in a 500 ml container and fixed with 2-3 ml of 25% acidified Lugol's iodine solution. ( 3.)150ml water samples were collected from the surface underway system using an automated Cefas Technology Limited water sampler into polyethylene bags which had 2.5 ml of 25% acidified Lugol's iodine solution added. Sample analysis: All phytoplankton samples collected underwent full taxonomic analysis in house, using a light microscope and following the Utermöhl method (Paxinos and Mitchell, 2000) on a 25 ml of sample. The identification was done at the species level whenever possible, and the results reported as number of cells per litre. Phytoplankton taxa and abundance were determined after sedimentation of the samples in 25 ml glass chambers, and using an inverted microscope (Utermöhl 1931). Size of most common taxon were measured with a micrometer and used for calculating cell volume and biomass (µgC l-1). Using the measurements collected from all the samples, average cell volume (μm3) of each taxon were calculated using geometric formulas given by Edler (1979), except for the genus Ceratium. Volume of the latter was calculated according to Thomsen (1992). To convert cell volume to carbon (pg C) the equations of Menden-Deuer and Lessard (2000) were used. When cell measurements were not available for a given taxon, the cell carbon contents suggested by Harrison et al. (2015) were used in the calculations. Due to difficulties in determining cell abundance in colonies, the carbon content of Phaeocystis colonies was determined from the radius of the colony, adopting the relationship of Verity et al. (2007). Estimates of biomass were combined with the abundance data to calculate the biomass per litre. Abundances and carbon contents of phytoplankton taxa were grouped based on functional groups (e.g. centric diatoms, pennate diatoms). The trophic status of dinoflagellates (i.e. autotrophic or heterotrophic) was not determined therefore dinoflagellates were included as part of the phytoplankton (rather than microzooplankton).

Conformity

Data format

name of format

version of format

Constraints related to access and use

Constraint set

Use constraints

Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply

Constraint set

Limitations on public access

Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply

Responsible organisations

Metadata on metadata

Metadata point of contact

contact position

Data Manager

organisation name

Centre for Environment, Fisheries & Aquaculture Science

full postal address

Cefas Lowestoft Laboratory

Pakefield Road

Lowestoft

NR33 0HT

UK

telephone number

+44 (0)1502 562244

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2021-07-08T13:22:54

Metadata language

eng