Identification

Title

Modelled and observed fish feeding traits for the North Atlantic and Arctic Oceans (1836-2020) and population estimates of fish with different feeding traits from Northeast Atlantic scientific trawl surveys (1997-2020)

Abstract

The data we provide here have been assembled to categorise fish into feeding guilds and determine change in populations of fish with different feeding traits relevant to food web status assessment advocated by OSPAR. We provide five datasets: The first is a csv file titled ‘stomach data observations’ contains observations from fish stomach contents of individual prey weight, prey functional group (i.e., zooplankton, benthos, fish, nekton and other), predator taxonomy, predator size, and the region and year the samples were collected (Table 1; see Column_headers_readme.txt). The second is a csv file titled ‘modelled stomach data’ provides predictions from a linear mixed effects model of individual prey weight based on those stomach contents observations, alongside modelled estimates of prey counts and biomass which enable the full collation of stomach contents information to be used in our feeding guild classification (Table 2; feeding guilds are predatory categories assigned using cluster analysis on stomach content data; see Thompson et al., 2023). The third dataset is a shapefile titled ‘feeding guild responses in survey data’ and provides haul-level estimates of feeding guild species richness, numbers of fish and their biomass based on scientific trawl surveys from the Northeast Atlantic (Tables 3-4). The fourth is a shapefile titled ‘temporal changes in feeding guilds’ which contains correlation coefficients and *p* values following Kendall’s τ trend analysis between mean haul-level values of feeding guild biomass and species richness for each assessment strata and year. Kendall’s τ scores of –1 to +1 represent a 100% probability of a decreasing or increasing trend, respectively (Table 5). The fifth dataset which provides the data to categorise fish taxa and body mass classes into feeding guilds along with the number of stomach samples, predator-prey mass ratios, average individual prey mass, average predator size in cm, the % of different prey functional groups, axes scores from non-metric multidimensional scaling analysis and the hierarchy of feeding guilds from cluster analysis.

Resource type

dataset

Resource locator

https://data.cefas.co.uk/view/21771

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: Binary download, CSV, ESRI Shapefile. The data can also be accessed via the WFS and WMS protocols.

function: download

Unique resource identifier

code

CEFAS21771

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

environment

2012-01-11

Geographic location

West bounding longitude

1.73881

East bounding longitude

1.74086

North bounding latitude

52.4595

South bounding latitude

52.4581

Temporal reference

Temporal extent

Begin position

1836-02-24

End position

2020-10-08

Dataset reference date

date type

notPlanned

Quality and validity

Lineage

*Stomach contents data* We draw together stomach contents data primarily collected from the North Atlantic shelf seas, with important contributions from the Baltic, Barents and Norwegian Seas in the Arctic Ocean. These data were sourced from a combination of previously published and unpublished data including DAPSTOM (Pinnegar, 2019), ICES Year of the Stomach (Daan, 1981; ICES, 1997), the Northeast US continental shelf (Smith & Link, 2010), Northern Spanish shelf (Arroyo et al., 2017), Gulf of Cadiz (Torres et al., 2013), Swedish-, Icelandic-, Norwegian-, French- (Cachera et al., 2017; Timmerman et al., 2020; Travers-Trolet, 2017; Verin, 2018) and German-led surveys (e.g., FishNet, `https://www.nationalpark-wattenmeer.de/wissensbeitrag/fishnet/`_; BioConsult, 2023). The observations used to model prey weight contain information from 621,040 fish stomachs (Table 1), from 146 predator taxa collected between 1963 – 2020 and includes larvae (<1 g) to adults (up to 351 kg). The full dataset contains predictions of prey weights and counts based on predator size, predator taxa and prey functional group information from 944,129 fish stomachs (Table 2), 227 predator taxa collected between 1836 – 2020 and includes larvae (<1 g) to adults (up to 351 kg). *Scientific trawl survey data* Scientific trawl data were obtained from Lynam and Ribeiro (2022), a data product derived from Northeast Atlantic groundfish data from surveys undertaken between 1983-2020 with observations for the biomass and numbers of species size classes standardised to the area swept for each haul. We make use of data collected using otter trawls between 1997 – 2020. We process the data by categorising fish into feeding guilds using taxonomic and size information and sum estimates of biomass, numbers, and species richness by feeding guild for each haul observation. We provide the unique assessment units used in the pilot assessment to determine change in feeding guild responses (Lynam et al., 2022; Lynam & Piet, 2022; Thompson et al., 2023). We provide details of the columns used in Table 3, a summary of the specific surveys used in Table 4. Details of the columns in the data containing correlations and *p* values based following Kendall’s τ trend analysis are provided in Table 5. *Associated scientific study* These data were processed for the study "Fish functional groups of the North Atlantic and Arctic Oceans ", by Murray S.A. Thompson, Izaskun Preciado, Federico Maioli, Valerio Bartolino, Andrea Belgrano, Michele Casini, Pierre Cresson, Elena Eriksen, Gema Hernandez-Milian, Ingibjörg G. Jónsdóttir, Stefan Neuenfeldt, John K. Pinnegar, Stefán Ragnarsson, Sabine Schückel, Ulrike Schückel, Brian E. Smith, María Ángeles Torres, Thomas J. Webb, and Christopher P. Lynam (in prep; see also Thompson et al., 2023). .. _`https://www.nationalpark-wattenmeer.de/wissensbeitrag/fishnet/`: https://www.nationalpark-wattenmeer.de/wissensbeitrag/fishnet/

Conformity

Conformity report

specification

title

INSPIRE Data Specification on Species Distribution – Technical Guidelines

reference date

date type

publication

effective date

2013-12-10

degree

false

explanation

See the referenced specification

Conformity report

specification

title

INSPIRE Data Specification on Habitats and Biotopes – Technical Guidelines

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

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

email address

data.manager@cefas.co.uk

responsible party role

pointOfContact

Metadata date

2025-02-10T12:27:01

Metadata language

eng