| Contributors | Affiliation | Role |
|---|---|---|
| Madin, Laurence P. | Woods Hole Oceanographic Institution (WHOI) | Principal Investigator |
| Kremer, Patricia | University of Connecticut (UConn) | Co-Principal Investigator |
| Copley, Nancy | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
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
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)
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.
| File |
|---|
salp_swarms.csv (Comma Separated Values (.csv), 712.45 KB) MD5:1aac572602344f657aeda7d34e3e71e3 Primary data file for dataset ID 3146 |
| Parameter | Description | Units |
| cruise_id | cruise designation | |
| year | year, reported as YYYY, e.g. 2005 | |
| haul_id | haul identification number | |
| date_local | local month, day and year, usually as a text string, e.g. feb10_1995. | |
| time_local | time of day, local time, using 2400 clock format | |
| month_local | month of year, local time | |
| yrday_local | local day and decimal time, as 326.5 for the 326th day of the year, or November 22 at 1200 hours | |
| lat | latitude, in decimal degrees, North is positive, negative denotes South | decimal degrees |
| lon | longitude, in decimal degrees, East is positive, negative denotes West | decimal degrees |
| day_local | day, local time | |
| dvol_liters | displacement volume (biovolume) of plankton net samples | liters |
| volfilt | volume of water filtered during plankton tow | meters^3 |
| biovol_per_aliq | the 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 |
| form | the morphological stage of the salp, either aggregate (agg) or solitary (sol) | |
| fertilized_flag | for colonial stage only: Y=embryos present; N=none seen | |
| fraction_chain_inside | the fraction of the embryo that is still inside the solitary adult after capture in the net. | |
| comments | free text comments | |
| length | 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. | millimeters (?) |
| 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. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a 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 term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934. |
| 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. |
| 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 |
| 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 |
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.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) |