Dataset: pangaea_zoo
Deployment: ANT-XII_2

Multinet zooplankton data - mostly copepods - from ANT-XII/2

Principal Investigator:

Dr Sigi Schiel (Alfred Wegener Institute for Polar and Marine Research, AWI)

BCO-DMO Data Manager:

Ms Dicky Allison (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Census of Marine Zooplankton-2004-2010 (CMarZ_2004-2010)

Current State:

Final no updates expected

Version:

8 July 2010

Deployment Synonyms:

ISPOL

Version Date:

2010-11-19

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/453092/data

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Description

The mesozooplankton community, with special emphasis on calanoid copepods, was studied with respect to its species composition, abundance, vertical distribution and developmental structure during the Ice Station POLarstern(ISPOL) expedition to the ice-covered western Weddell Sea. Stratified zooplankton tows were carried out nine times between 1 December 2004 and 2 January 2005 with a multiple opening/closing net between 0 and 1000 m depth. Copepods were by far the most abundant taxon, contributing more than 94% of the total mesozooplankton. ... Calanoides acutus and Metridia gerlachei represented other abundant calanoid species contributing an average of 8% and 7%, respectively. All other species comprised less than 3%. ... The Ice Station POLarstern(ISPOL) expedition provided the opportunity to continue the investigations on zooplankton in the western Weddell Sea but in a different season, in spring 2004. The aims of the present study were the analyses of the zooplankton communities under perennial sea ice cover in the western Weddell Sea during the transition from spring to early summer with emphasis on major differences in abundance, vertical distribution and stage composition of the three dominating calanoid copepods Microcalanus pygmaeus, C. acutus and Metridia gerlachei." (http://dx.doi.org/10.1016/j.dsr2.2007.12.013)

Methods & Sampling

Dataset acquisition description

"Zooplankton was sampled between 1 December 2004 and 2 January 2005. Sampling was carried out nine times, and the interval between sampling varied between 3 and 5 days depending on the sea-ice conditions A multiple opening/closing net system (0.25 m2 aperture) equipped with five nets of 100 micron mesh size was used. Daytime vertical hauls were conducted at 0.5 m/sec between 1000 m and the surface, covering five standard depth intervals. The filtered volume was measured for each net by a digital flow meter. The samples were preserved in 4% borax-buffered formaldehyde/seawater solution and analysed for taxa composition, abundance, distribution and age structure."(http://dx.doi.org/10.1016/j.dsr2.2007.12.013)

Deployment-specific acquisition description

A multiple opening-closing net ("midi type") with an opening of 0.25 m2 equipped with
5 nets of 100 um mesh size and with a digital flowmeter was used as a standard
device for the quantitative sampling of mesozooplankton. The multinet was towed
vertically, sampling the standard layers of 0 - 50 m, 50 - 100 m, 100 - 200 m, 200 - 300 m and 300 to the bottom layer. Sampling was carried out every third day
depending on ice conditions. The net samples were preserved in borax-buffered 4 %
formaldehyde/sea water solution. For molecular genetic purposes, a "maxi type"
multiple opening-closing net with an opening of 0.5 m2 equipped with nine nets of
100 um mesh size and with a digital flowmeter was deployed four times. Nine
successive depth layers were sampled between near the sea floor and the surface.
These net samples were preserved in 90 %-ethanol. Both nets were towed vertically
at 0.5 m sec-1.

Data Processing Description

Dataset Processing Description

"According to density, samples were split into subsamples (1/2 - 1/32) using a Folsom splitter. Rare taxa and developmental stages were counted from the entire sample. With 10 exceptions, calanoid and harpacticoid copepods were identified to species level, and the sex and developmental stage was also determined. Cyclopoid specimens were only identified to genus level. In the calanoid genera Paraeuchaeta, Scaphocalanus and Lucicutia and the harpactidoid Drescheriella, copepodite stages were not further identified to species level but combined. Mean abundance is given as geometric mean. The mean population stage was calculated according to Marin (1987), and the weighted mean depth after Bollens and Frost (1989). Female copepods of C. acutus and M. gerlachei were sorted from preserved samples, and four different gonad developmental stages were determined according to Runge (1985): immature (stage 1), medium ripe (stage 2), semi-ripe (stage 3) and ripe (stage 4)." (http://dx.doi.org/10.1016/j.dsr2.2007.12.013)

References:

Bollens, S.M. and B.W. Frost, 1989. Predator-induced diel vertical migration in a planktonic copepod, Journal of Plankton Research 11 (5) (1989), pp. 1047 - 1065.

Marin,V. 1987. The oceanographic structure of the eastern Scotia Sea IV. Distribution of copepod species in relation to hydrography in 1981, Deep-Sea Research I 34 (1) (1987), pp. 105 - 121.

Runge,J.A., 1985. Relationship of egg production of Calanus pacificus to seasonal changes in phytoplankton availability in Puget Sound, Washington, Limnology and Oceanography 30 (2) (1985), pp. 382 - 396.

More information about this dataset deployment

Funding

Award Number	Funding Source
unknown CMarZ_2004-2010 Sloan	Alfred P. Sloan Foundation

Instruments

MultiNet

Supplied Description:

The MultiNet for this dataset was a multiple opening/closing net system (0.25 m2 aperture) equipped with five nets of 100 µm mesh size.

Instrument Type

Generic Name: MultiNet

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0099/

Generic Description:

The MultiNet© Multiple Plankton Sampler is designed as a sampling system for horizontal and vertical collections in successive water layers. Equipped with 5 or 9 net bags, the MultiNet© can be delivered in 3 sizes (apertures) : Mini (0.125 m2), Midi (0.25 m2) and Maxi (0.5 m2). The system consists of a shipboard Deck Command Unit and a stainless steel frame to which 5 (or 9) net bags are attached by means of zippers to canvas. The net bags are opened and closed by means of an arrangement of levers that are triggered by a battery powered Motor Unit. The commands for actuation of the net bags are given via single or multi-conductor cable between the Underwater Unit and the Deck Command Unit. Although horizontal collections typically use a mesh size of 300 microns, mesh sizes from 100 to 500 may also be used. Vertical collections are also common. The shipboard Deck Command Unit displays all relevant system data, including the actual operating depth of the net system.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	cruise identifier	none	cruise_id
station	station number; a number unique to a cruise designating a general geographic location at which one or more sampling activities may occur		station
time_utc	Time in 24-hour clock.	hours and minutes	time_utc
date_utc	Date, universal coordinated time.	mm/dd/yy	date_utc
lat	Latitude. North is positive and South is negative.	decimal degrees	lat
lon	Longitude. West is negative and East is positive.	decimal degrees	lon
depth_w	Depth of water at this station.	meters	depth_w
net	Which net in a multiple net system.		net
depth_range	The min and max values over which the net was open.	meters	depth_range
depth_min	The shallowest depth the particular net fished.	meters	depth_min
depth_max	The deepest depth the particular net fished.	meters	depth_max
depth_mid	The middle of the depth range over which the net sampled. The one depth chosen to represent the sample collection depth if one depth is necessary.	meters	depth_mid
volume_filt	How much water went through the net when it was fishing this depth.	cubic meters	vol_filt
species	A binomial that consists of a genus name followed byt he species name of an organism. In this case, the sex and immaturity of the animal were added onto the species name. F:female, M:male, C: copepodite.		species
abundance	Individuals per cubic meter.		abundance

Database

Contribute Data

Dataset: pangaea_zoo
Deployment: ANT-XII_2

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: pangaea_zooDeployment: ANT-XII_2

Dataset acquisition description

Deployment-specific acquisition description

Dataset Processing Description

Dataset: pangaea_zoo
Deployment: ANT-XII_2