Dataset: Sand lance morphometrics

Name: Morphometrics of northern sand lance Ammodytes dubius offspring reared under factorial CO2 x temperature conditions
Published: 2018-11-20
Keywords: biota, oceans

Cite This Dataset

DOI:10.1575/1912/bco-dmo.749958.1

Spatial Extent: N:42.166183 E:-70.312275 S:42.166183 W:-70.312275

Temporal Extent: 2016-12-02 - 2018-01-31

Project:

Sensitivity of larval and juvenile sand lance Ammodytes dubius on Stellwagen Bank to predicted ocean warming, acidification, and deoxygenation (OA Stellwagen Sand Lance)

Principal Investigator:

Hannes Baumann (University of Connecticut, UConn)

Co-Principal Investigator:

Christopher S. Murray (University of Connecticut, UConn - Avery Point)

David Wiley (Stellwagen Bank National Marine Sanctuary)

Contact:

Hannes Baumann (University of Connecticut, UConn)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2018-11-20

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Morphometrics of northern sand lance Ammodytes dubius offspring reared under factorial CO2 x temperature conditions

Abstract:

Morphometric source data of 2016-2018 experimental work on the sensitivity of northern sand lance (A. dubius) offspring to combined ocean warming and acidification.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2018-11-20	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.1575/1912/bco-dmo.749958.1	2019-09-23

Description

Morphometric source data of 2016-2018 experimental work on the sensitivity of northern sand lance offspring to combined ocean warming and acidification.

Methods & Sampling

Spawning-ripe sand lance were collected from SBNMS (42° 9' 58.26'' N, 70° 18' 44.19'' W) on 2 December 2016 and 22 November 2017, using a 1.3 × 0.7 m beam trawl (6 mm mesh) towed at 3 knots for 15 minutes.

We tested factorial combinations of three pCO2 × three temperature levels. The target for pCO2 controls was 400 µatm (~8.15 pHNIST), a level characteristic of the average open ocean and of the A. dubius spawning habitat in late fall (Salisbury & Jönsson, 2018). As contrasts, we chose 1,000 µatm (~7.78 pH) and 2,100 µatm (~7.48 pH), which correspond to predicted average ocean pCO2 levels by the years 2100 and 2300, respectively.

Response traits: Sub-sampled hatchlings were measured for two body size metrics; standard length, somatic body area (nearest 0.01 mm2), and two measures of remaining endogenous energy reserves; yolk sac area (nearest 0.001 mm2), and oil globule area (nearest 0.001 mm2).

Data Processing Description

Data processing: Data were cross-checked with hand-written notes, checked for outliers/erroneous entries/numbers.

BCO-DMO Data Processing:
- modified parameter names (replaced spaces with underscores)
- converted latitude and longitude from degrees, minutes, seconds to decimal degrees
- reformatted date from mm/dd/yyyy to yyyy-mm-dd
- replaced "n/a" with "nd" (no data).

Data Files

File
sand_lance_morphometrics.csv (Comma Separated Values (.csv), 222.50 KB) MD5:1df6be2d6a09973be36cdc93e2815be5 Primary data file for dataset ID 749958

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1536165
New Hampshire Sea Grant	RNE16-CTHCE-l

Deployments

None available yet

Instruments

Beam Trawl

Supplied Name: beam trawl

Supplied Description:

Spawning-ripe sand lance were collected using a beam trawl.

Instrument Type

Generic Name: Beam Trawl

Acronym: Beam trawl

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/24/

Generic Description:

A beam trawl consists of a cone-shaped body ending in a bag or codend, which retains the catch. In these trawls the horizontal opening of the net is provided by a beam, made of wood or metal, which is up to 12 m long. The vertical opening is provided by two hoop-like trawl shoes mostly made from steel. No hydrodynamic forces are needed to keep a beam trawl open. The beam trawl is normally towed on outriggers, one trawl on each side.

While fishing for flatfish the beam trawl is often equipped with tickler chains to disturb the fish from the seabed. For operations on very rough fishing grounds they can be equipped with chain matrices. Chain matrices are rigged between the beam and the groundrope and prevent boulders/stones from being caught by the trawl. Shrimp beam trawls are not so heavy and have smaller mesh sizes. A bobbin of groundrope with rubber bobbins keeps the shrimp beam trawl in contact with the bottom and gives flatfish the opportunity to escape.

Close bottom contact is necessary for successful operation. To avoid bycatch of most juvenile fishes selectivity devices are assembled (sieve nets, sorting grids, escape holes). While targeting flatfish the beam trawls are towed up to seven knots, therefore the gear is very heavy; the largest gears weighs up to 10 ton. The towing speed for shrimp is between 2.5 and 3 knots.

(from: http://www.fao.org/fishery/geartype/305/en)

pH Sensor

Supplied Name: pH electrode

Supplied Description:

pH electrode (Hach pHD, calibrated weekly using 2-point pHNIST references)

Instrument Type

Generic Name: pH Sensor

Generic Description:

An instrument that measures the hydrogen ion activity in solutions.

The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
trial	Trial number	unitless	exp_id
species	Ammodytes dubius, the northern sand lance	unitless	species
adult_collection_site	Site of the collection of wild adult spawners	unitless	site
latitude	Latitude of adult collection site	decimal degrees	lat
longitude	Longitude of adult collection site	decimal degrees	lon
tank	Tank number	unitless	tank
replicate	Within experiment replicate number	unitless	replicate
temperature	Average temperature experienced by fish in degrees celsius	degrees Celsius	temp
pH	Average pH level experienced by the fish NBS	pH NBS	pH
pCO2	Calculated average pCO2 levels in uatm calculated by CO2SYS based on alkalinity, pH, and temperature	uatm	pCO2
fertilization_date	Date offspring were fertilized by stripspawning 10+ adults of each sex; format: yyyy-mm-dd	unitless	date
sample_date	Date offspring were sampled from replicates and preserved; format: yyyy-mm-dd	unitless	date
age	The age of the larvae in days post-fertilization	days	age
sample_type	The sample group; either at hatch or 150 degree days post-hatch	unitless	sample_type
SL	Larval standard length (mm)	millimeters (mm)	length
SA	Larval somatic body area at hatch (mm^2)	millimeters squared (mm^2)	no_bcodmo_term
YSA	Larval yolk-sac area at hatch (mm^2)	millimeters squared (mm^2)	no_bcodmo_term
OGA	Larval oil globule area at hatch (mm^2)	millimeters squared (mm^2)	no_bcodmo_term