Dataset: larval_krill_growth
Deployment: LMG0205

Southern Ocean: larval krill growth studies, 2001-2002

Principal Investigator:

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

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)

Project:

U.S. GLOBEC Southern Ocean (SOGLOBEC)

Current State:

Final no updates expected

Version:

20100203

Coordinated Deployments:

NBP0204

Version Date:

2010-02-03

Data URL:

https://www.bco-dmo.org/dataset-deployment/453004/data

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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

Dataset 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)

Data Processing Description

Dataset 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)

Associated datasets:
larval_krill_sum - summary of experiments
larval_krill_pig - whole body fluorescence and clearance
larval_krill_cf - condition factor, C:N ratio

More information about this dataset deployment

Funding

Award Number	Funding Source
ANT-9909933	NSF Antarctic Sciences

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

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	cruise identification		cruiseid
year	year of experiment		year
sample_id	experiment number		sample
stage	larval stage: F = furcila, J = juvenile, SA = subadult, IM = immature male, MM = mature male, ns, US and NT = no stage determined (usually due to damage)		stage
length	krill total length at end of experiment.	mm	length
growth	growth increment, as % change per intermolt period, if molted; nm = not measured, nd=not molted.	percent	no_bcodmo_term
change_flag	advance in stage (0 = no; 1 = yes) (if molted) or dead in experiment (use only for TL not molting)		no_bcodmo_term
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
day_local	day of month, local time		day_local
month_local	month of year, local time		month_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
time_local	time of day, local time, using 2400 clock format		time_local

Database

Contribute Data

Dataset: larval_krill_growth
Deployment: LMG0205

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: larval_krill_growthDeployment: LMG0205

Dataset acquisition description

Dataset Processing Description

Dataset: larval_krill_growth
Deployment: LMG0205