Species and habitats - Limanda limanda (Common Dab) - Mature - BTS annual abundance in July (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
- Title
-
Species and habitats - Limanda limanda (Common Dab) - Mature - BTS annual abundance in July (1989-2006)
- Alternate title
-
BTS_species_geostatA
- Date (Publication)
- 2009-12-31T00:00:00
- Citation identifier
- CHARM_LIMALIM_S1_BTS_06_R
- 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
-
CEFAS
- Credit
-
CHARM consortium
- Status
- Completed
- Point of contact
-
Organisation name Individual name Electronic mail address Role Center for Environment, Fisheries & Aquaculture Science
Steve Mackinson
Local service desk CHARM Consortium
CHARM Consortium
Production center
- 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
-
-
Habitats et biotopes
-
-
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
- 25000
- 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
- 2006-12-31
- Reference system identifier
- 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
Distributor
- Distributor contact
-
Organisation name Individual name Electronic mail address Role Ifremer - Centre de Brest
Dissemination Unit
- Distributor format
-
Name Version
- OnLine resource
- 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
Metadata
- File identifier
- d12ff151-a4b6-453a-afbc-14c4187fbe90
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2020-06-04T00:56:38
- Metadata standard name
-
ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
-
1.0
- Metadata author
-
Organisation name Individual name Electronic mail address Role Ifremer
Fanny Lecuy
Local service desk