Abundance, size, fecundity of Salpa aspera in the Slope Waters off northeastern USA from R/V Oceanus OC379, OC381 in the slope waters off NJ, DE, MD from June-Sept. 2002 (SalpSwarmDyn project)

Website: https://www.bco-dmo.org/dataset/3146
Data Type: Cruise Results
Version: 1
Version Date: 2009-07-14

Project
» Salp Swarm Dynamics (SalpSwarmDyn)
ContributorsAffiliationRole
Madin, Laurence P.Woods Hole Oceanographic Institution (WHOI)Principal Investigator
Kremer, PatriciaUniversity of Connecticut (UConn)Co-Principal Investigator
Copley, NancyWoods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Abundance, size, fecundity of Salpa aspera in the Slope Waters off northeastern USA from R/V Oceanus OC379, OC381 in the slope waters off NJ, DE, MD from June-Sept. 2002.


Coverage

Spatial Extent: N:40.60553 E:-67.994893 S:36.802395 W:-74.733377
Temporal Extent: 2002-06-03 - 2002-09-26

Dataset Description

Abundance, size, fecundity of Salpa aspera in the Slope Waters off northeastern USA from R/V Oceanus OC379 and OC381 in the slope waters off NJ, DE, MD from June-Sept. 2002

Associated datasets: salp_chloro


Acquisition Description

Bongo tows were made to a depth of about 50m (based on wire out and wire angle). As the tows were done at night, that includes essentially the entire population of these vertically migrating salps. Information on the depth distribution of the species is included in: Madin et al. (2006) (pdf)


Processing Description

The sizes for the aggregates are for individual animals in the chains. Chains were broken up during collection. Measurements of the aggregates do not include the "tips" but are for oral-aboral length only. The solitary forms are basically cylindrical so the length measurements are for the totals.

'premature': These embryos were released as an artifact associated with net collection.

OC-381: 'live biovolume of counted/measured aliquot': for the first few tows this represents the aliquot, ml of the total that was enumerated. Beginning with Tow 7, all aliquots were 250 ml . If the total was less than that, the entire sample was counted.


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Related Publications

Madin, L. P., Kremer, P., Wiebe, P. H., Purcell, J. E., Horgan, E. H., & Nemazie, D. A. (2006). Periodic swarms of the salp Salpa aspera in the Slope Water off the NE United States: Biovolume, vertical migration, grazing, and vertical flux. Deep Sea Research Part I: Oceanographic Research Papers, 53(5), 804–819. doi:10.1016/j.dsr.2005.12.018
Results

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Parameters

ParameterDescriptionUnits
cruise_idcruise designation
yearyear, reported as YYYY, e.g. 2005
haul_idhaul identification number
date_locallocal month, day and year, usually as a text string, e.g. feb10_1995.
time_localtime of day, local time, using 2400 clock format
month_localmonth of year, local time
yrday_locallocal day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours
latlatitude, in decimal degrees, North is positive, negative denotes South decimal degrees
lonlongitude, in decimal degrees, East is positive, negative denotes West decimal degrees
day_localday, local time
dvol_litersdisplacement volume (biovolume) of plankton net samples liters
volfiltvolume of water filtered during plankton tow meters^3
biovol_per_aliqthe aliquot, ml of the total that was enumerated. Beginning with Tow 7 (OC-379), all aliquots were 250 ml . If the total was less than that, the entire sample was counted. milliliters
formthe morphological stage of the salp, either aggregate (agg) or solitary (sol)
fertilized_flagfor colonial stage only: Y=embryos present; N=none seen
fraction_chain_insidethe fraction of the embryo that is still inside the solitary adult after capture in the net.
commentsfree text comments
lengthThe sizes for the aggregates are for individual animals in the chains. Chains were broken up during collection. Measurements of the aggregates do not include the "tips" but are for oral-aboral length only. The solitary forms are basically cylindrical so the length measurements are for the totals. millimeters (?)


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Instruments

Dataset-specific Instrument Name
Conductivity, Temperature, Depth
Generic Instrument Name
CTD profiler
Generic Instrument Description
The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.

Dataset-specific Instrument Name
Fluorometer
Generic Instrument Name
Fluorometer
Generic Instrument Description
A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.


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Deployments

OC379

Website
Platform
R/V Oceanus
Start Date
2002-06-01
End Date
2002-06-14
Description
salp study Original cruise data are available from the NSF R2R data catalog

OC381

Website
Platform
R/V Oceanus
Start Date
2002-09-14
End Date
2002-09-27
Description
Original cruise data are available from the WHOI Data Library and Archives: http://dlacruisedata.whoi.edu/OC/OC381L01/ and from the NSF R2R data catalog: http://www.rvdata.us/catalog/OC381. The cruise was supported by NSF OCE award: OCE-0002540


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Project Information

Salp Swarm Dynamics (SalpSwarmDyn)

Coverage: slope water off mid-Atlantic Bight


Salps are holoplanktonic grazers that have a life history, feeding biology and population dynamic strikingly different from copepods or other crustacean zooplankton. They can occur in very dense populations that cover large areas, and these blooms have been shown to have major impacts due to grazing and production of fast?sinking fecal pellets. However the conditions supporting bloom formation, and the energetics, reproduction and behavior of the bloom?forming salps are still poorly understood. This study will focus on two species of salps that are global in their distribution and representative of two genera that commonly form large blooms. Salpa aspera regularly occurs during the summer in high concentrations in the slope waters of the Mid?Atlantic Bight, while Thalia democratica regularly forms dense populations during the winter spring in the Georgia Bight. The investigators will examine feeding, metabolism, growth, reproduction and population dynamics of these salps. They will use two independent modeling approaches, grounded in experimental and field data, to extend their observations to other time and space scales. interpret ouexperimental and modeling results will be interpreted within the context of the environmental conditions to which the salps are exposed. This integrated approach will provide the best basis for understanding how salp blooms form and persist. Results of this study will extend to other species that occur in high densities in many locations, allowing scientists to better evaluate the importance of salps in biogeochemical cycles and in structuring the pelagic environment.



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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