Dataset: larval_krill_sum

Name: Station information for larval krill studies 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

Spatial Extent: N:-65.08 E:-66.86 S:-68.4817 W:-75.9983

Project:

U.S. GLOBEC Southern Ocean (SOGLOBEC)

Program:

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

Principal Investigator:

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

Co-Principal Investigator:

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

BCO-DMO Data Manager:

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

Version:

2010-02-03

Version Date:

2010-02-03

Validated:

Yes

Current State:

Final no updates expected

Station information for larval krill studies 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 (PID)	Date PID Issued
2010-02-03	National Oceanographic Data Center (NODC)	0112636	2013-09-01

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)

Methods & Sampling

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)

Data 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)

DMO Note: Date discrepancy LMG0205: The following dates did not agree between the datafile submitted to the DMO and the date in the eventlog. The eventlog date was substituted in the following cases:

inst	date in datafile	date in eventlog
Dive9	8/16/2002	8/15/2002
Dive10	8/16/2002	8/15/2002
Trawl5	8/26/2002	8/25/2002
Trawl5	8/26/2002	8/25/2002
Trawl11	8/28/2002	8/27/2002

Associated datasets:
larval_krill_pig - whole body fluorescence and clearance
larval_krill_cf - condition factor, C:N ratio
larval_krill_gr - growth study

Data Files

File
larval_krill_sum.csv (Comma Separated Values (.csv), 4.98 KB) MD5:70cc1d8259cd449bc61da9358a3777f0 Primary data file for dataset ID 3297

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. This term could also refer to a simple tool like a hammer, saw, or other hand-held tool.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	cruise identification		cruiseid
year	year of experiment		year
station	ice station name or opportunistic sampling		station
event	event number		event
dive	dive number or trawl number		no_bcodmo_term
date_local	local date month/day/year		date_local
lat	latitude, in decimal degrees, North is positive, negative denotes South	decimal degrees	lat
lon	longitude, in decimal degrees, East is positive, negative denotes West	decimal degrees	lon
IGR_num	instantaneous growth rate experiment number		no_bcodmo_term
pigmnt_expt_id	whole body fluorescence (WBF) or whole body clearance (WBC) experiment number		no_bcodmo_term
cond_fact_expt_flag	condition factor measured on larvae flag - yes (y) or no (nd)		no_bcodmo_term
under_ice_sample_flag	under-ice surface sample (Chl, CHN) on larvae flag - yes (y) or no (nd)		no_bcodmo_term
depth_w	water depth	meters	depth_w
month_local	month, local time		month_local
day_local	day of month, local time		day_local
yrday_local	local day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours (noon)		yrday_local

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Database

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Dataset: larval_krill_sum