Citation:

essd-7-173-2015

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Abstract:

In recent years a global increase in jellyfish (i.e. Cnidarians and Ctenophores) abundance and a rise in the recurrence of jellyfish outbreak events have been largely debated, but a general consensus on this matter has not been achieved yet. Within this debate, it has been generally recognized that there is a lack of reliable data that could be analyzed and compared to clarify whether indeed jellyfish are increasing throughout the world ocean as a consequence of anthropogenic impact and hydroclimatic variability. During the G.O. Sars cruise jellyfish were collected at different depths in the 0-1000m layer using a standard 1 m**2 Multiple Opening/Closing Net and Environmental Sensing System (MOCNESS) (quantitative data), Harstad and macroplankton trawls (qualitative data). The comparison of records collected with different nets during the G.O. Sars transatlantic cruise shows that different sampling gears might provide very different information on jellyfish diversity. Indeed, the big trawls mostly collect relatively large scyphozoan and hydrozoan species such as Atolla, Pelagia, Praya, Vogtia, while small hydrozoans (e.g. Clytia, Gilia, Muggiaea) and early stages of ctenophora are only caught by the smaller nets.

Project(s):

Basin Scale Analysis, Synthesis and Integration (EURO-BASIN)

Funding:

Seventh Framework Programme (FP7), grant/award no. 264933 : Basin Scale Analysis, Synthesis and Integration

Coverage:

Median Latitude: 64.431034 * Median Longitude: -16.505585 * South-bound Latitude: 59.380000 * West-bound Longitude: -46.193125 * North-bound Latitude: 68.790000 * East-bound Longitude: 5.070500

Date/Time Start: 2013-05-03T18:50:00 * Date/Time End: 2013-05-20T18:34:00

Minimum DEPTH, water: 13 m * Maximum DEPTH, water: 900 m

Event(s):

GS13/107_152_JFN (Station 152) * Latitude: 62.420000 * Longitude: 5.070000 * Date/Time: 2013-05-03T20:30:00 * Location: North Atlantic * Campaign: (Norwegian Trans Atlantic Cruise) * Basis: * Method/Device: Jellyfish net (JFN) * Comment: mesh size = 800 µm; vertical tows between the surface and 200 m water depth

GS13/107_152_MOC (Station 152) * Latitude: 62.416668 * Longitude: 5.070500 * Date/Time: 2013-05-03T18:50:00 * Location: North Atlantic * Campaign: (Norwegian Trans Atlantic Cruise) * Basis: * Method/Device: MOCNESS opening/closing plankton net (MOC) * Comment: mesh size = 180 µm; oblicate tow between maximum depth and surface; net opening diamter = 1 m

GS13/107_154_MOC (Station 154) * Latitude: 64.140000 * Longitude: 1.560000 * Date/Time: 2013-05-04T19:01:00 * Location: North Atlantic * Campaign: (Norwegian Trans Atlantic Cruise) * Basis: * Method/Device: MOCNESS opening/closing plankton net (MOC) * Comment: mesh size = 180 µm; oblicate tow between maximum depth and surface; net opening diamter = 1 m

Comment:

The research leading to these results received (partial/full) funding from the European Commission FP7 EURO-BASIN (European Basin-Scale Analysis, Synthesis, and Integration; Grant Agreement 264 933).

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event
2	Method/Device of event	Method/Device
3	Date/Time of event	Date/Time
4	Latitude of event	Latitude
5	Longitude of event	Longitude
6	DEPTH, water	Depth water	m		Geocode
7	Depth, top/min	Depth top	m	Licandro, Priscilla
8	Depth, bottom/max	Depth bot	m	Licandro, Priscilla
9	Cnidaria	Cnidaria	#/m³	Licandro, Priscilla
10	Ctenophora	Ctenophora	#/m³	Licandro, Priscilla

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

376 data points

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