Dataset: larval_krill_cf

Name: Larval krill condition factor and C:N ratios from ARSV Laurence M. Gould LMG0106, LMG0205 in the Southern Ocean from 2001-2002 (SOGLOBEC project)
Published: 2010-02-03
Keywords: oceans

Cite This Dataset

Project:

U.S. GLOBEC Southern Ocean (SOGLOBEC)

Program:

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)

Principal Investigator:

Dr Langdon Quetin (University of California-Santa Barbara, UCSB)

Dr Robin Ross (University of California-Santa Barbara, UCSB)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

2010-02-03

Version Date:

2010-02-03

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Data URL:

https://www.bco-dmo.org/dataset/3298/data

Larval krill condition factor and C:N ratios from ARSV Laurence M. Gould LMG0106, LMG0205 in the Southern Ocean from 2001-2002 (SOGLOBEC project)

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2010-02-03	National Oceanographic Data Center (NODC)	0112563	2013-08-30

Description

The goal of the larval krill studies was to investigate the physiology and ecology of krill larvae associated with the pack ice and the microbial community on which they feed.

During LMG0106 we occupied two 4-5 day ice stations (Robert and Billy) and sampled several other ice floes opportunistically. We conducted 10 instantaneous growth rate experiments, and 4 whole body clearance time experiments to determine gut passage time (decline in pigment content over time). We also sampled larvae at two additional sites for initial body pigment content (whole body fluorescence), and at 4 sites for condition factor. The under-ice algal community was sampled at one site. Length and stage frequency determinations were also determined.

We occupied three time-series stations of approximately 1 week each, and in addition opportunistically sampled at times when other activities had priority. Our primary goal during the cruise was to occupy three ice camps or process stations with the intent of thoroughly studying the under-ice environment by SCUBA in conjunction with other projects working topside. (from cruise report LMG0205)

Acquisition Description

Using SCUBA techniques allowed us to collect larval krill as close as possible to their in situ condition. Larval krill were collected for time-based experimentation at the dive hole, for shipboard experiments and preserved for later analysis. Samples of the micro-zooplankton community were sampled with suction samplers to gain a better understanding of food available to the larvae relative to their distribution under the ice. In addition, at one of the process stations we were able to deploy drift nets through the dive holes to compare day/night differences in the zooplankton community at depths of 1 m and 10 m below the ice-water interface. (from cruise report LMG0205)

Processing Description

We collected enough krill for 12 Instantaneous Growth Rate (IGR) experiments, 15 collections for whole body (WBF) fluorescence, 11 collections for fecal pellet production (WBC), and 9 collections for condition factor. Measurements of length and stage frequency of the dive and net krill collections were done routinely. (from cruise report LMG0205)

condition factor

Associated datasets:
larval_krill_sum - summary of experiments
larval_krill_gr - growth study
larval_krill_pig - whole body fluorescence and clearance

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Antarctic Sciences	ANT-9909933

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
LMG0106		2001-07-21	ARSV Laurence M. Gould	Daniel P. Costa (Chief Scientist)	data info
LMG0205		2002-07-29	ARSV Laurence M. Gould	Daniel P. Costa (Chief Scientist)	data info

Instruments

Hand-held plankton net

Supplied Name: Hand-net

Supplied Description:

Instrument Type

Generic Name: Hand-held plankton net

Acronym: Hand-net

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/22/

Generic Description:

A Hand-held plankton net is a fine-meshed net designed for sampling microzooplankton, mesozooplankton or nekton.

Manual Biota Sampler

Supplied Name: SCUBA

Supplied Description:

Instrument Type

Generic Name: Manual Biota Sampler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/90/

Generic Description:

Manual Biota Sampler indicates that a sample was collected in situ by a person, possibly using a hand-held collection device such as a jar, a net or their hands.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	cruise identification		cruiseid
year	year of experiment		year
dive	dive or trawl number for krill collection		unknown
length	total length of specimen	mm	length
C	carbon content	micrograms	unknown
N	Nitrogen content of specimen	milligrams	unknown
CN_ratio	ratio of Carbon to Nitrogen content of specimen		unknown
cond_fact	condition factor calculated as Carbon per total length cubed	micrograms Carbon/Total Length ^3	unknown
dry_wt	dry weight of the krill specimen	milligrams	dry_wgt_mg

Database

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Dataset: larval_krill_cf