2013 - 2014 Centre for Environment, Fisheries & Aquaculture Science (Cefas) Phytoplankton abundance data for Spring and Autumn of 2018 in the Celtic Sea
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.
dataset
CEFAS697e2edd-c5c3-4d89-b84c-f8e5e7c62586
http://www.cefas.co.uk/
eng
OGP
urn:ogc:def:crs:EPSG::4326
revision
2011-03-25
publication
2008-06-01
1.73881
1.74086
52.4595
52.4581
revision
2010-05-18
2013-10-12
2014-11-01
publication
2021-07-08
notPlanned
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).
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Public data (Crown Copyright) - Open Government Licence Terms and Conditions apply
Data Manager
Centre for Environment, Fisheries & Aquaculture Science
Cefas Lowestoft Laboratory
Pakefield Road
Lowestoft
NR33 0HT
UK
+44 (0)1502 562244
pointOfContact
2021-07-08T13:22:54