Alternate title

FYFS_species_geostatP

Date (Publication)

2009-12-31T00:00:00

Citation identifier

CHARM_GADUMOR_NURS_FYFS_R

Presentation form

Digital map

Other citation details

Source CHARM Consortium

Credit

IFREMER

Credit

CHARM consortium

Status

Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Ifremer	Franck Coppin	franck.coppin@ifremer.fr	Resource provider
CHARM Consortium	CHARM Consortium	sandrine.vaz@ifremer.fr	Custodian

Maintenance and update frequency

As needed

Thèmes Sextant

• /Biological Environment/Species/Fish Species of Commercial Interest

Discipline

• Species data set

• CHARM

GEMET - INSPIRE themes, version 1.0

• Répartition des espèces

external.theme.gemet

• ressource halieutique

Use limitation

research-only

Access constraints

License

Other constraints

Has to be cited this way in maps : "Source CHARM Consortium"

Other constraints

Has to be cited this way in bibliography : "Carpentier A, Martin CS, Vaz S (Eds.), 2009. Channel Habitat Atlas for marine Resource Management, final report / Atlas des habitats des ressources marines de la Manche orientale, rapport final (CHARM phase II). INTERREG 3a Programme, IFREMER, Boulogne-sur-mer, France. 626 pp. & CD-rom"

Spatial representation type

Grid

Denominator

25000

Language

English

Language

Français

Character set

UTF8

Topic category

• Oceans
• Biota
• Environment

Environment description

Microsoft Windows XP ; ESRI ArcGIS 9.x

Geographic identifier

Eastern English Channel

Begin date

1977-01-01

End date

2006-12-31

Reference system identifier

WGS 84 (EPSG:4326)

Number of dimensions

2

Dimension name

Column

Dimension size

426

Resolution

0.009  degree

Dimension name

Row

Dimension size

209

Resolution

0.009  degree

Cell geometry

Area

Transformation parameter availability

No

OnLine resource

Protocol	Linkage	Name
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm	CHARM_GADUMOR_NURS_FYFS_R
WWW:LINK	http://www.ifremer.fr/charm/	CHARM web site
COPYFILE		FYFS_GADUMOR_pluri

Hierarchy level

Dataset

Statement

Between 1977 and 2006, in September, IFREMER conducted French Young Fish Surveys alond the French coasts. This dataset comprises data from four surveys covering different periods (Bay of Veys, 1977-1981; Bay of Seine, 1995-2002; Bay of Somme, 1998-2006; DYFS, 1977-1983). The French YFs taking place in the Bays of Somme and Seine uses a 3 m beam trawl outside of the bays, but a 2 m beam trawl witin the bays. Data have sometimes been standardised to take into account the difference in gear characteristics.

Description

Due to data scarcity, it was not possible to produce annual maps of species abundance. These had to be averaged based on their position over all the available period. The resulting averaged dataset was mapped by kriging.Statistical analysis : the statistical distribution of biological data were tested for normality (histograms, skewness, kurtosis). The data were transformed whem skewness value exceeded |1| and/or kurtosis exceeded 1 and if a normalising function that could improve the data distribution was found. Biological variables were measured on scales based on analytical conventions that are unrelated to the natural processes generated them. Therefore, any transformed scale is as appropriate as those on which these data were originally recorded. Geostatistical interpolation : the spatial variation of biological data were analysed using GENSTAT (GENSTAT 7 Committee, 2004), which is a GENeral STATistics package including the main geostatistical tools. It computes experimental variograms, fits these with various authorised mathematical models and uses them to calculate kriged estimates on a fine regular grid (of latitudes and longitudes). The grid of points was imported into ArcMap and interpolated with the Spatial Analyst extension in order to create a continuous raster of 1 km² resolution. The resulting maps illustrate the spatial distributions and the variations over time for biological data studied in CHARM's area. For legends of maps, approximates od the 5th and the 95th quantiles were used for the minimales and maximales values respectively.

Description

FYFS surveys, scientific surveys from IFREMER

Metadata

File identifier

b617a095-b97b-4e57-aefa-42358f1e5fb1 XML

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2020-06-04T00:55:13

Metadata standard name

ISO 19115:2003/19139 - SEXTANT

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Ifremer	Sandrine Vaz	sandrine.vaz@ifremer.fr	Point of contact