Title

Species and habitats - Chelidonichthys gurnardus - All ages - IBTS Annual abundance in summer (1991-2010)

Alternate title

IBTS_species_geostatA

Date (Publication)

2012-04-10T00:00:00

Citation identifier

CHARM_CHELGUR_IBTS_1991-2010

Presentation form

Digital map

Other citation details

Source CHARM Consortium

Abstract

Biologic data have been expressed in abundance (numbers or density values (nbr/km²)) and always required to be log-transformed using a log10(x+1) transformation.

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	Production Unit
CHARM Consortium	CHARM Consortium	sandrine.vaz@ifremer.fr	Production center

Maintenance and update frequency

As needed

Thèmes Sextant

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

Discipline

• Species data set

• CHARM

• Grey gurnardus

• Grondin gris

GEMET - INSPIRE themes, version 1.0

• Répartition des espèces

external.theme.gemet

• ressource halieutique

Use limitation

research-only

Access constraints

License

Other legal constraints

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

Other legal 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

2500

Language

Français

Language

English

Character set

UTF8

Topic category

• Oceans
• Biota
• Environment

Environment description

Microsoft Windows XP ; ESRI ArcGIS 9.x

Geographic identifier

Eastern English Channel

Begin date

1989-01-01

End date

2007-12-31

Reference system identifier

WGS 84 (EPSG:4326)

Number of dimensions

2

Dimension name

Column

Dimension size

768

Resolution

0.009  degree

Dimension name

Row

Dimension size

660

Resolution

0.009  degree

Cell geometry

Area

Transformation parameter availability

OnLine resource

Protocol	Linkage	Name
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_IBTSQ3_FISH_chelgur_q3
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_IBTSQ3_chelgur_q3
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1991
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1992
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1993
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1994
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1995
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1996
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1997
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1998
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_1999
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2000
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2001
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2002
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2003
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2004
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2005
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2006
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2007
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2008
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2009
OGC:WMS	https://sextant.ifremer.fr/services/wms/wms_charm3	CHARMIII_CHELGUR_IBTS_2010
COPYFILE		CHARMIII_IBTSQ3_FISH_chelgur_q3
COPYFILE		CHARMIII_IBTSQ3_chelgur_q3
COPYFILE		1991
COPYFILE		1992
COPYFILE		1993
COPYFILE		1994
COPYFILE		1995
COPYFILE		1996
COPYFILE		1997
COPYFILE		1998
COPYFILE		1999
COPYFILE		2000
COPYFILE		2001
COPYFILE		2002
COPYFILE		2003
COPYFILE		2004
COPYFILE		2005
COPYFILE		2006
COPYFILE		2007
COPYFILE		2008
COPYFILE		2009
COPYFILE		2010

Hierarchy level

Dataset

Statement

The survey extends from the Eastern English Channel to the south of the North Sea, which corresponds to ICES divisions VIId and IVc. The study area is divided into rectangles of 15° latitude and 15° longitude using a systematic sampling strategy. The sampling gear is a high opening bottom trawl well adapted for catching demersal species, with a 10 mm mesh size (side knot) for catching juveniles. This sampling gear is polyvalent and is well adapted to the varying seabed types encountered in the study area. One or two 30 minutes hauls are performed within each rectangle of the grid. The fishing hauls are chosen using professional fishing plans or found by prospecting. The fishing method is standardised: sampling stations have been each year at similar locations and identical sampling gear is used. Since 1997, temperature and salinity (surface and bottom) are measured using a probe attached on the headrope of the trawl. At each sampling station, all the fish species are sorted, weighed, counted and measured. For certain commercial species, bony structures (otoliths) are collected.

Description

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 experimentala 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. Average and standard deviation maps were computed based on all interpolated maps over all the period studied.

Description

IBTS Q3 (July, August, September), annual scientific survey of IFREMER

Metadata

File identifier

21684317-5aa0-40bf-b070-4762cd5412b8

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2020-06-04T00:42:04

Metadata standard name

ISO 19115:2003/19139 - SEXTANT

Metadata standard version

1.0

Metadata author

Organisation name	Individual name	Electronic mail address	Role
Ifremer	Erwann Quimbert	sextant@ifremer.fr	Local service desk