Shell quality of pteropods held for 1-14 days in three CO2 treatments with pteropods collected with a Reeve net during R/V Tioga cruises in the Gulf of Maine from 2014 to 2015

Website: https://www.bco-dmo.org/dataset/780791
Data Type: Cruise Results
Version: 1
Version Date: 2019-11-05

Project
» Seasonal and Ontogenetic Effects of Ocean Acidification on Pteropods in the Gulf of Maine (Gulf of Maine Pteropods)

Program
» Science, Engineering and Education for Sustainability NSF-Wide Investment (SEES): Ocean Acidification (formerly CRI-OA) (SEES-OA)
ContributorsAffiliationRole
Maas, AmyWoods Hole Oceanographic Institution (WHOI)Principal Investigator
Lawson, GarethWoods Hole Oceanographic Institution (WHOI)Co-Principal Investigator
Tarrant, Ann M.Woods Hole Oceanographic Institution (WHOI)Co-Principal Investigator
York, Amber D.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager


Coverage

Spatial Extent: N:42.3683 E:-69.71 S:42 W:-70.2567
Temporal Extent: 2014-01 - 2015-04

Dataset Description

Shell quality of pteropods held for 1-14 days in three CO2 treatments with pteropods collected with a Reeve net during R/V Tioga cruises in the Gulf of Maine from 2014 to 2015.

These data were published in Maas et al. (2018) and Maas et al. (in review).

Related Datasets: 
* Pteropod abundance and distribution: https://www.bco-dmo.org/dataset/780874
* Pteropod respiration experiments: https://www.bco-dmo.org/dataset/780886


Methods & Sampling

Methodology:

Pteropod adult (>0.5 mm, with fully developed wings/parapodia) were captured for experiments using a Reeve net with 333-m mesh and a large cod end that was deployed at slow speeds, for a short duration (< 1 h) with the aim of gently sampling live, undamaged specimens on various cruises. Tows were conducted at multiple stations in the Gulf of Maine (C42 22.1’ - 42 0.0’ N and 69 42.6’ - 70 15.4’ W). Individuals for respiration experiments were returned via coolers to a walk-in cold-room facility at the Woods Hole Oceanographic Institution within 8 h of collection. The cold-room was set at a constant temperature of 8C for all experiments. During each experimental period, water had been collected from an offshore site concurrent to pteropod sampling and had been returned to the lab in advance for filtration (0.2-m) and thermal equilibration. It had been bubbled with ambient air, which ranged from a calculated 380 to 440 atm over the seasonal cycle, for ~12 h prior to the arrival of the pteropods. Upon arrival, pteropods were placed in 1-L beakers of water containing the filtered in situ water (15 ind L-1) for 8-12 h to allow for further temperature acclimatization and gut clearance. After this period, healthy looking individuals (actively swimming or with parapodia extended) were placed into glass respiration chambers (containing optode spots; OXFOIL: PyroScience, Aachen Germany) with 2-3 mL fresh 0.2-m filtered water. A control chamber, without a pteropod, was set up for every fourth chamber to determine background bacterial respiration. The oxygen concentration was measured non-invasively at the start of the experiment and 24 h later using a FireStingO2 optical oxygen meter (PyroScience, Aachen Germany). At the conclusion of the experiment, each organism was visually inspected to confirm survival, briefly rinsed with DI water, placed in a pre-weighed aluminum dish, and weighed on a Cahn microbalance (C-33; 1 g precision) for wet mass. They were then dried for 3-7 days in a drying oven at 60C and weighed again to obtain dry mass. Final oxygen consumption rates were calculated based on the change in oxygen between the final and initial oxygen measurements, corrected for the bacterial respiration from the control chambers (mol O2 h-1).

Sampling and analytical procedures:

Temperature in the experiments was continually monitored using the Pyrosciences temperature logger that comes with the Firesting meter and are reported for only the ~24 duration of the respiration experiments.

Carbonate chemistry parameters are calculated as the average (over the course of the whole 14 day experiment) of measured pH, DIC and TA values using CO2sys. To monitor the carbonate chemistry during the experiments, subsamples of water (50 mL) from each carboy were taken every 2–3 days and measured spectrophotometrically for pH as described in White et al. (2013). To more fully characterize the carbonate chemistry of the experimental treatments, discrete samples for analysis of dissolved inorganic carbon (DIC) and total alkalinity (TA) were also collected from the pre-equilibrated water at weekly intervals, prior to its transfer to the carboys (day 0 and 7) and from the water in each carboy right before it was replaced during water transfers (day 7 and 14). This provided both the starting and ending DIC and TA of each batch of water for the first two weeks, and the starting conditions for week 3. DIC was measured using an Apollo SciTech DIC auto-analyzer, while TA was measured using an Apollo SciTech alkalinity auto-titrator, a Ross combination pH electrode, and a pH meter (ORION 3 Star) based on a modified Gran titration method (detailed in Wang et al., 2017). pH is reported on the seawater scale (pHsw). Salinity was measured with a Hannah refractometer.


Data Processing Description

CO2sys_v2.1

Matlab processing script "transparency_code.m" was used (see Supplemental Files section for full description and download access).

There are no temperature and salinity values for 2015 in this dataset.

BCO-DMO Data Manager Processing Notes:
* Excel file exported as csv
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions
* blank values in this dataset are displayed as "nd" for "no data." nd is the default missing data identifier in the BCO-DMO system.


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Data Files

File
pter_shells.csv
(Comma Separated Values (.csv), 15.26 KB)
MD5:7e5476566efd67ac53257800e91a6d81
Primary data file for dataset ID 780791

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Supplemental Files

File
transparency_code.m
(MATLAB Programming Script (.m), 2.88 KB)
MD5:cebfc172f20862b7b1c490b33d4fdae3
This MATLAB code converts an image (.jpg) of a pteropod shell take with a stereomicroscopoe and calculates the transmittance (images taken with light from below) or opacity (images taken with lighting from the sides) . The code identifies shells against the white background by thresholding the image to black and white. The aperture as well as any holes or dark areas resulting from remaining tissue are then manually cropped from the object. The transmittance was calculated as the mean grayscale value (range: 0-255) of the pixels of the shell divided by 255 to get a scale of 0 (black) to 1 (white), while opacity is calculated in the opposite fashion 1 (black) to 0 (white).

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Related Publications

Maas, A. E., Lawson, G. L., Bergan, A. J., & Tarrant, A. M. (2017). Exposure to CO2influences metabolism, calcification and gene expression of the thecosome pteropodLimacina retroversa. The Journal of Experimental Biology, 221(3), jeb164400. doi:10.1242/jeb.164400
General
Maas, A. E., Lawson, G. L., Bergan, A. J., Wang, Z. A., & Tarrant, A. M. (2020). Seasonal variation in physiology and shell condition of the pteropod Limacina retroversa in the Gulf of Maine relative to life cycle and carbonate chemistry. Progress in Oceanography, 186, 102371. https://doi.org/10.1016/j.pocean.2020.102371
General
Wang, Z. A., Lawson, G. L., Pilskaln, C. H., & Maas, A. E. (2017). Seasonal controls of aragonite saturation states in the Gulf of Maine. Journal of Geophysical Research: Oceans, 122(1), 372–389. doi:10.1002/2016jc012373 https://doi.org/10.1002/2016JC012373
Methods
White, M. M., McCorkle, D. C., Mullineaux, L. S., & Cohen, A. L. (2013). Early Exposure of Bay Scallops (Argopecten irradians) to High CO2 Causes a Decrease in Larval Shell Growth. PLoS ONE, 8(4), e61065. doi:10.1371/journal.pone.0061065
Methods

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Parameters

ParameterDescriptionUnits
YearYear for cruise of collection in format yyyy unitless
monthMonth for cruise of collection unitless
CruiseTioga cruise number unitless
xpt_durationLength of organism experimental captivity in days days
Treatmenttreatment name unitless
wet_masspteropod wet mass at end of experiment milligrams (mg)
Transmittancelight transmittance through shell percent (%)
tempavg. temp of the experiment Celsius
salinityavg. salinity of the experiment Practical Salinity Units (PSU)
OM_arcalculated avg. saturation state (ΩAr) of experiment dimensionless
pCO2 calculated avg. pCO2 of experiment microatmospheres (uatm)
pHavg. pH of experiment pH scale


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Instruments

Dataset-specific Instrument Name
OXFOIL: PyroScience, Aachen Germany
Generic Instrument Name
Optode
Generic Instrument Description
An optode or optrode is an optical sensor device that optically measures a specific substance usually with the aid of a chemical transducer.

Dataset-specific Instrument Name
FireStingO2 optical oxygen meter
Generic Instrument Name
Oxygen Sensor
Dataset-specific Description
FireStingO2 optical oxygen meter (PyroScience, Aachen Germany)
Generic Instrument Description
An electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed

Dataset-specific Instrument Name
Generic Instrument Name
pH Sensor
Dataset-specific Description
Ross combination pH electrode, and a pH meter (ORION 3 Star) based on a modified Gran titration method (detailed in Wang et al., 2017).
Generic Instrument 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+). 

Dataset-specific Instrument Name
Reeve net with 333-m mesh and a large cod end
Generic Instrument Name
Reeve Net
Generic Instrument Description
A Reeve Net is a conventional ring net with a very large acrylic cylindrical cod-end (30 liters) designed to collect fragile gelatinous animals. The net is lowered to a particular depth and then hauled slowly back to the surface (5-10 m/min). Reeve (1981) also described a double net system with no bridle and flotation at the net mouth that is attached to a roller mechanism that rides on a tow wire. The roller system is locked in place by a pressure release device. Once below a set pressure, the roller and nets are released and they float slowly up the wire, gently collecting the zooplankton, without being influenced by the motion of the vessel and associated vertical wire movements. (from Wiebe and Benfield, 2003)

Dataset-specific Instrument Name
Hannah refractometer
Generic Instrument Name
Refractometer
Generic Instrument Description
A refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry). The index of refraction is calculated from Snell's law and can be calculated from the composition of the material using the Gladstone-Dale relation. In optics the refractive index (or index of refraction) n of a substance (optical medium) is a dimensionless number that describes how light, or any other radiation, propagates through that medium.

Dataset-specific Instrument Name
Pyrosciences temperature logger
Generic Instrument Name
Temperature Logger
Dataset-specific Description
Pyrosciences temperature logger that comes with the Firesting meter
Generic Instrument Description
Records temperature data over a period of time.


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Deployments

TI729

Website
Platform
R/V Tioga
Report
Start Date
2014-01-29
End Date
2014-01-30
Description
The central goal of this cruise was to document the abundance and vertical distribution of the pteropod species Limacina retroversa, to capture live individuals for experimentation, and to sample the carbonate chemistry profile of two sites in the Gulf of Maine.

TI746

Website
Platform
R/V Tioga
Report
Start Date
2014-04-25
End Date
2014-04-27
Description
The central goal of this cruise was to document the abundance and vertical distribution of the pteropod species Limacina retroversa, to capture live individuals for experimentation, and to sample the carbonate chemistry profile of two sites in the GoME.

TI777

Website
Platform
R/V Tioga
Report
Start Date
2014-08-19
End Date
2014-08-20
Description
Live capture of pteropod Limacina retroversa for experiments and water sampling for carbonate chemistry profile.

TI787

Website
Platform
R/V Tioga
Report
Start Date
2014-11-04
End Date
2014-11-06
Description
Live capture of pteropod Limacina retroversa for experiments and water sampling for carbonate chemistry profile and MOCNESS tow for later analysis of pteropod community. [underway data not available at this time: 2015-07-28]

TI806

Website
Platform
R/V Tioga
Start Date
2015-04-25
End Date
2015-04-27
Description
Metadata from the Tioga data archive (accessed 2019-11-04): https://www.whoi.edu/what-we-do/explore/ships/ships-tioga/data-archive/ Institution: WHOI Cruise: ti806 Start Port: WHOI April 25, 2015 1500 EDT End Port: WHOI April, 27, 2015  2000 EDT Chief Scientist: Gareth Lawson  Project: Pteropod Collection Area: Wilkinson Basin Crew: Capt. K.E. Houtler, Ian G. Hanley  Participants:    Leg 1 (ti806-01)         M. Lowe T. Crockford A. Thabet A. Bergan H. Johnson   Leg 2 (ti806-02)         T. Crockford M. Lowe A. Bergan A. Thebat B. Jones   Instrument Status: LowerLabValve: open TSG: On ADCP: UHDAS   Knudsen: ON (no data collected) CTD: Yes MassSpec: N/A R2R Eventlog: N/A  


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Project Information

Seasonal and Ontogenetic Effects of Ocean Acidification on Pteropods in the Gulf of Maine (Gulf of Maine Pteropods)


Coverage: Gulf of Maine


This project will involve a series of five short cruises in 2013 and 2014, during which a variety of hydrographic, chemical, and biological data and samples will be collected, as well as a number of laboratory experiments examining pteropod physiology and gene expression.

From NSF proposal abstract:

Dissolution of excess anthropogenic CO2 into the ocean is causing the marine environment to decrease in pH. This "ocean acidification" is predicted to threaten a broad variety of marine organisms, particularly calcifying animals such as the thecosome (i.e., shelled) pteropods. These pelagic gastropods form an aragonite shell, are prey for a number of commercially important fish, and are significant contributors to carbon biogeochemistry. Their ecosystem importance, abundance, and sensitivity to dissolution position them as an important group for investigating the impacts of acidification. Our understanding of the effect of high CO2 on pteropods and the pelagic ecosystem, however, is limited primarily to short-term studies of adult calcification and respiration response in the polar ecosystems. There have been no seasonal studies of sensitivity and our understanding of the effect of CO2 on pteropod early life stages is limited. Limacina retroversa is a particularly abundant thecosome pteropod in the North Atlantic, where it is prey for a number of fisheries species and other top predators. This species is also the most common pteropod in the Gulf of Maine (GoM) where it is present year round. L. retroversa thus offers the prospect of a useful model pteropod species, given both its ecological importance and its abundance in readily accessible waters. The investigators will conduct a series of short cruises to sample L. retroversa on a seasonal basis from local waters of the GoM near Cape Cod. The carbonate chemistry of the GoM fluctuates seasonally, providing the opportunity to assess the response of wild caught pteropods to natural changes in CO2. By characterizing the carbonate chemistry of the water column and measuring the metabolic rate, shell quality, and gene expression of pteropods throughout the year, the researchers will achieve a time series of pteropod sensitivity to CO2. Subsequently, using experimental manipulations the investigators will explore the effect of seasonal acclimation on pteropod response to short- and medium-term exposure to enhanced CO2. Pteropods frequently lay eggs in captivity, and at WHOI there is institutional expertise in maintaining these individuals in the laboratory. Building on these strengths, the researchers will also study the effect of CO2 on embryonic and larval development in L. retroversa. These earliest life-stages of marine calcifiers are thought to be especially sensitive since initial shell precipitation and the highly energetic processes of growth and development are impeded by CO2 exposure. They will also document mortality, shell production, abnormality, and developmental rate of clutches of pteropod embryos exposed to increased CO2.

Intellectual Merit: Thecosome pteropods are an abundant group of calcifying zooplankters that have been chronically understudied, particularly in temperate regions. Due to its accessibility and ecological importance, L. retroversa can be developed as a valuable model, interesting both as the dominant pteropod in the commercially-important GoM region and also an abundant pteropod in the temperate waters of the North Atlantic. The goal of this research is to augment our knowledge of the distribution of L. retroversa, to attain an understanding of their seasonal sensitivity to natural variability in CO2, and to see how this exposure impacts responses to both short- and medium-term CO2 exposure. Using powerful transcriptomic technologies, the research will transform our understanding of this group by investigating the molecular mechanisms of response in L. retroversa to both seasonality and varying durations and intensities of acidification, contextualized by ecosystem- and organism-level metrics. Furthermore the study will examine the effect of CO2 on the eggs of pteropods for the first time, providing insight into their sensitivity to an acidifying environment.



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Program Information

Science, Engineering and Education for Sustainability NSF-Wide Investment (SEES): Ocean Acidification (formerly CRI-OA) (SEES-OA)


Coverage: global


NSF Climate Research Investment (CRI) activities that were initiated in 2010 are now included under Science, Engineering and Education for Sustainability NSF-Wide Investment (SEES). SEES is a portfolio of activities that highlights NSF's unique role in helping society address the challenge(s) of achieving sustainability. Detailed information about the SEES program is available from NSF (https://www.nsf.gov/funding/pgm_summ.jsp?pims_id=504707).

In recognition of the need for basic research concerning the nature, extent and impact of ocean acidification on oceanic environments in the past, present and future, the goal of the SEES: OA program is to understand (a) the chemistry and physical chemistry of ocean acidification; (b) how ocean acidification interacts with processes at the organismal level; and (c) how the earth system history informs our understanding of the effects of ocean acidification on the present day and future ocean.

Solicitations issued under this program:
NSF 10-530, FY 2010-FY2011
NSF 12-500, FY 2012
NSF 12-600, FY 2013
NSF 13-586, FY 2014
NSF 13-586 was the final solicitation that will be released for this program.

PI Meetings:
1st U.S. Ocean Acidification PI Meeting(March 22-24, 2011, Woods Hole, MA)
2nd U.S. Ocean Acidification PI Meeting(Sept. 18-20, 2013, Washington, DC)
3rd U.S. Ocean Acidification PI Meeting (June 9-11, 2015, Woods Hole, MA – Tentative)

NSF media releases for the Ocean Acidification Program:

Press Release 10-186 NSF Awards Grants to Study Effects of Ocean Acidification

Discovery Blue Mussels "Hang On" Along Rocky Shores: For How Long?

Discovery nsf.gov - National Science Foundation (NSF) Discoveries - Trouble in Paradise: Ocean Acidification This Way Comes - US National Science Foundation (NSF)

Press Release 12-179 nsf.gov - National Science Foundation (NSF) News - Ocean Acidification: Finding New Answers Through National Science Foundation Research Grants - US National Science Foundation (NSF)

Press Release 13-102 World Oceans Month Brings Mixed News for Oysters

Press Release 13-108 nsf.gov - National Science Foundation (NSF) News - Natural Underwater Springs Show How Coral Reefs Respond to Ocean Acidification - US National Science Foundation (NSF)

Press Release 13-148 Ocean acidification: Making new discoveries through National Science Foundation research grants

Press Release 13-148 - Video nsf.gov - News - Video - NSF Ocean Sciences Division Director David Conover answers questions about ocean acidification. - US National Science Foundation (NSF)

Press Release 14-010 nsf.gov - National Science Foundation (NSF) News - Palau's coral reefs surprisingly resistant to ocean acidification - US National Science Foundation (NSF)

Press Release 14-116 nsf.gov - National Science Foundation (NSF) News - Ocean Acidification: NSF awards $11.4 million in new grants to study effects on marine ecosystems - US National Science Foundation (NSF)



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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