Distribution of Whiting Larvae from CPR samples for period 7 (years 1999 to 2005) - Point data

Fish larvae were collected by the continuous plankton recorder (CPR, operated by SAHFOS) all year long between 1951 and 2005 along transects in the Celtic Sea and English Channel. The CPR is towed by ships of opportunity at speeds of 15 to 20 knots, at an approximate depth of 10 m. Water enters the recorder through an aperture of 1.27 cm2, and is filtered through a continuously moving band of silk with an average mesh size of 270 μm.

Date (Publication): 2012-07-24T00:00:00

Identifier: Distribution of Whiting Larvae from CPR samples for period 7 (years 1999 to 2005) - Point data

Status: completed Completed

Resource provider

Cefas - Sophie Pitois

Maintenance and update frequency: Unknown

Discipline

Species data set
CHARM
Ichthyoplankton
Merlangius merlangus

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: vector Vector

Denominator: 2500

Metadata language: Français

Metadata language: English

Character set: utf8 UTF8

Character set: utf8 UTF8

Topic category

Oceans
Biota
Environment

Environment description: Microsoft Windows XP ; ESRI ArcGIS 9.x

Geographic identifier: Eastern English Channel

Begin date: 1999-01-01T00:00:00

End date: 2005-12-31T00:00:00

Reference system identifier: EPSG / WGS 84 (EPSG:4326) / 7.9

Distributor

Distributor

Ifremer - Centre de Brest

Protocol: FILE

Name: t1

Description: trimestre 1

Protocol: FILE

Name: t2

Description: trimestre 2

Protocol: FILE

Name: t3

Description: trimestre 3

Protocol: FILE

Name: t4

Description: trimestre 4

OnLine resource: CHARMIII_CEFAS_Icthyoplankton_y7t1WHG ( OGC:WMS-1.3.0-http-get-map )
trimestre 1

OnLine resource: CHARMIII_CEFAS_Icthyoplankton_y7t2WHG ( OGC:WMS-1.3.0-http-get-map )
trimestre 2

OnLine resource: CHARMIII_CEFAS_Icthyoplankton_y7t3WHG ( OGC:WMS-1.3.0-http-get-map )
trimestre 3

OnLine resource: CHARMIII_CEFAS_Icthyoplankton_y7t4WHG ( OGC:WMS-1.3.0-http-get-map )
trimestre 4

Hierarchy level: Dataset

Statement: In all, over 50 taxonomic groups of ichthyoplankton were identified, but we focused on the 6 most abundant groups of fish larvae, clupeids (Clupeidae), Atlantic mackerel (Scomber scombrus), rocklings, horse mackerel (Trachurus trachurus), whiting (Merlangius merlangus), and gadoids (Gadidae). These were the only taxonomic groups for which we had enough positive samplings points in order to produces maps of distribution.

The data are aggregated by 7 years periods (1: 1957 to 1963, 2: 1964 to 1970, 3: 1971 to 1977, 4: 1978 to 1984, 5: 1985 to 1991, 6: 1992 to 1998 and 7: 1999 to 2005) and by trimesters. The number of points by year/trimester periods is calculated. For each year/trimester period, the number of non-zero observation for each species/species group is also calculated. If this number is less than 10, the species/group species and period is plotted as a bubble plot. If it is more than 10, the sampling will be interpolated by kriging to have a presence map in the whole area