Species and habitats - Raja montagui - All ages Male - Multi-annual abundance in July during BTS (1989-2006)

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.

Simple

Alternate title
BTS_species_geostatP
Date ( Publication )
2009-12-31T00:00:00
Identifier
CHARM_RAJAMON_M_BTS_R
Presentation form
Digital map
Other citation details
Source CHARM Consortium
Credit
CEFAS
Credit
CHARM consortium
Status
Completed
Point of contact
Center for Environment, Fisheries & Aquaculture Science - Steve Mackinson ( )
Custodian
CHARM Consortium - CHARM Consortium
Maintenance and update frequency
As needed
Thèmes Sextant ( Theme )
  • /Biological Environment/Species/Fish Species of Commercial Interest
Keywords ( Discipline )
  • Species data set
  • CHARM
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Habitats et biotopes
external.theme.gemet ( Theme )
  • 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
2500
Metadata language
fr
Metadata language
en
Character set
UTF8
Topic category
  • Oceans
  • Biota
  • Environment
Environment description
Microsoft Windows XP ; ESRI ArcGIS 9.x
Geographic identifier
Eastern English Channel
N
S
E
W
thumbnail


Begin date
1989-01-01
End date
2006-12-31
Reference system identifier
WGS 84 (EPSG:4326)
Number of dimensions
2
Dimension name
Column
Dimension size
660
Resolution
0.009  degree
Dimension name
Row
Dimension size
567
Resolution
0.009  degree
Cell geometry
Area
Transformation parameter availability
No

Distributor

Distributor
Ifremer - Centre de Brest
OnLine resource
CHARM web site ( WWW:LINK )

CHARM web site

OnLine resource
CHARM_RAJAMON_M_BTS_R ( OGC:WMS )
Protocol
COPYFILE
Name
BTS_RAJAMON_M_pluri
Hierarchy level
Dataset
Statement
The standard survey has a total of approximately 100 tows or stations (75 are in ICES division VIId,25 are in ICES division Ivc). A commercial 4m beam trawl fitted with a chain mat, flip-up ropes, and a 40 mm cod-end liner is used.The gear is towed at 4 knots (ground speed) for 30 minutes on a warp length appropriate to the depth of water. At each sampling station (only daylight), all the fish species are sorted, weighed, counted and measured.
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.
Description
BTS, annual scientific survey of CEFAS
File identifier
f9d80713-4aa1-4636-8260-3a5eeb7f9bd1 XML
Metadata language
en
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2020-06-04T00:29:36
Metadata standard name
ISO 19115:2003/19139 - SEXTANT
Metadata standard version
1.0
Point of contact
Ifremer - Fanny Lecuy
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET - INSPIRE themes, version 1.0
Habitats et biotopes
Thèmes Sextant
/Biological Environment/Species/Fish Species of Commercial Interest
external.theme.gemet
ressource halieutique

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