Percent cover of living organisms on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019

Website: https://www.bco-dmo.org/dataset/855879
Data Type: Other Field Results, experimental
Version: 1
Version Date: 2021-09-14

Project
» Collaborative Research: Pattern and process in the abundance and recruitment of Caribbean octocorals (Octocoral Community Dynamics)
ContributorsAffiliationRole
Lasker, HowardState University of New York at Buffalo (SUNY Buffalo)Principal Investigator
Martinez-Quintana, AngelaState University of New York at Buffalo (SUNY Buffalo)Scientist
Tonra, KaitlynState University of New York at Buffalo (SUNY Buffalo)Scientist
Wells, ChristopherState University of New York at Buffalo (SUNY Buffalo)Scientist, Contact
Anderson, EmilyState University of New York at Buffalo (SUNY Buffalo)Technician
York, Amber D.Woods Hole Oceanographic Institution (WHOI BCO-DMO)BCO-DMO Data Manager

Abstract
Percent cover of living organisms on experimental tiles of three treatments (scrubbed, reef, protected) determined using digital images of each tile taken on days 0, 19, and 57 after field deployment.


Coverage

Spatial Extent: Lat:18.309 Lon:-64.719
Temporal Extent: 2019-08-03 - 2019-09-29

Methods & Sampling

Methodology: 

Custom-fired stoneware clay tiles were deployed and conditioned on an octocoral-dominated reef in Grootpan Bay, St. John, U.S. Virgin Islands. One of three treatments was applied to each tile (n = 8 per treatment): a control, referred to as Reef; scrubbed with a soft nylon bristle brush, referred to as Scrubbed; or removed from the reef and maintained in a sea table for 15 days, referred to as Protected. Tiles were placed into 41  29  17 cm plastic containers filled with 12 L of 10 m filtered seawater. Two tiles from the same treatment were placed in each container on top of 1 cm square plastic mesh, rolled into 5 cm tall cylinders so that tiles were lifted off the bottom of the container to provide water circulation underneath. Competent planulae (n = 150) were added to each container and allowed to settle for eight days and then polyps were counted.

Percent cover of living cover was determined using digital images of each tile taken on days 0, 19, and 57 taken with an Olympus Tough TG-5 or TG-6 12-megapixel waterproof digital camera and two Sola Dive Pro 2000 lights. 

Location: Grootpan Bay, St. John, U.S. Virgin Islands (also known as East Cabritte in other studies) (18.309, -64.719). All tiles were deployed at this site. 

Instruments: 
Olympus Tough TG-5 or TG-6 12-megapixel waterproof digital camera (Olympus Corporation of the Americas, Center Valley, PA) 
Sola Dive Pro 2000 lights (Light & Motion, Marina, CA)


Data Processing Description

BCO-DMO data manager processing notes:

* Data from file NSF.Turf_Exp_tile_cover.xlsx sheet "data" imported into the BCO-DMO data system.
* Converted Date to ISO format yyyy-mm-dd
* Renamed data columns to meet BCO-DMO naming conventions (only [a-zA-Z0-9] and underscores).  Periods changed to underscores.
* Proportions rounded to three decimal places.


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Data Files

File
turf_tile_cover.csv
(Comma Separated Values (.csv), 6.00 KB)
MD5:0bb28d4e0fa6684950d2b48910d2b792
Primary data file for dataset ID 855879

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Related Publications

Wells, C. D., Martínez-Quintana, Á., Tonra, K. J., & Lasker, H. R. (2021). Algal turf negatively affects recruitment of a Caribbean octocoral. Coral Reefs. doi:10.1007/s00338-021-02103-z
Results

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Related Datasets

IsRelatedTo
Wells, C., Martinez-Quintana, A., Tonra, K., Lasker, H. (2021) Locations of mapped polyps on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-07-16 doi:10.26008/1912/bco-dmo.855889.1 [view at BCO-DMO]
Relationship Description: Coordinates (in cm) for the polyp locations of a subset of the tiles from the same experiment.
Wells, C., Martinez-Quintana, A., Tonra, K., Lasker, H. (2021) Polyp settlement and polyp counts on experimental tiles with different levels of turf algae cover during an in-situ experiment in St. John, US Virgin Islands in August and September of 2019. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-07-16 doi:10.26008/1912/bco-dmo.855867.1 [view at BCO-DMO]
Relationship Description: Polyp identifications and percent cover on the tiles over time for the same experiment.

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Parameters

ParameterDescriptionUnits
tagtile tag number when placed out in the field unitless
dayexperimental day the tiles were photographed during the field experiment (0 to 57) per day
datedate of photo in ISO 8601 format yyyy-mm-dd unitless
ascidianspercent cover of ascidians. Proportion (0-1) on experimental tiles. dimensionless
bivalvespercent cover of bivalves. Proportion (0-1) on experimental tiles. dimensionless
bryozoanspercent cover of bryozoans. Proportion (0-1) on experimental tiles. dimensionless
ccapercent cover of crustose coralline algae. Proportion (0-1) on experimental tiles. dimensionless
green_algaepercent cover of green algae. Proportion (0-1) on experimental tiles. dimensionless
ramicrustapercent cover of Ramicrusta textilis. Proportion (0-1) on experimental tiles. dimensionless
red_algaepercent cover of crustose non-coralline algae. Proportion (0-1) on experimental tiles. dimensionless
spongepercent cover of sponge. Proportion (0-1) on experimental tiles. dimensionless
bare_tilepercent cover of bare tile. Proportion (0-1) on experimental tiles. dimensionless
turf_algaepercent cover of turf algae. Proportion (0-1) on experimental tiles. dimensionless
worm_tubespercent cover of worm tubes. Proportion (0-1) on experimental tiles. dimensionless

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Project Information

Collaborative Research: Pattern and process in the abundance and recruitment of Caribbean octocorals (Octocoral Community Dynamics)

Coverage: St. John, US Virgin Islands


NSF Award Abstract:
Coral reefs are exposed to a diversity of natural and anthropogenic disturbances, and the consequences for ecosystem degradation have been widely publicized. However, the reported changes have been biased towards fishes and stony corals, and for Caribbean reefs, the most notable example of this bias are octocorals ("soft corals"). Although they are abundant and dominate many Caribbean reefs, they are rarely included in studies due to the difficulty of both identifying them and in quantifying their abundances. In some places there is compelling evidence that soft corals have increased in abundance, even while stony corals have become less common. This suggests that soft corals are more resilient than stony corals to the wide diversity of disturbances that have been impacting coral corals. The best coral reefs on which to study these changes are those that have been studied for decades and can provide a decadal context to more recent events, and in this regard the reefs of St. John, US Virgin Islands are unique. Stony corals on the reefs have been studied since 1987, and the soft corals from 2014. This provides unrivalled platform to evaluate patterns of octocoral abundance and recruitment; identify the patterns of change that are occurring on these reefs, and identify the processes responsible for the resilience of octocoral populations. The project will extend soft coral monitoring from 4 years to 8 years, and within this framework will examine the roles of baby corals, and their response to seafloor roughness, seawater flow, and seaweed, in determining the success of soft corals. The work will also assess whether the destructive effects of Hurricanes Irma and Maria have modified the pattern of change. In concert with these efforts the project will be closely integrated with local high schools at which the investigators will host marine biology clubs and provide independent study opportunities for their students and teachers. Unique training opportunities will be provided to undergraduate and graduate students, as well as a postdoctoral researcher, all of whom will study and work in St. John, and the investigators will train coral reef researchers to identify the species of soft corals through a hands-on workshop to be conducted in the Florida Keys.

Understanding how changing environmental conditions will affect the community structure of major biomes is the ecological objective defining the 21st century. The holistic effects of these conditions on coral reefs will be studied on shallow reefs within the Virgin Islands National Park in St. John, US Virgin Islands, which is the site of one of the longest-running, long-term studies of coral reef community dynamics in the region. With NSF-LTREB support, the investigators have been studying long-term changes in stony coral communities in this location since 1987, and in 2014 NSF-OCE support was used to build an octocoral "overlay" to this decadal perspective. The present project extends from this unique history, which has been punctuated by the effects of Hurricanes Irma and Maria, to place octocoral synecology in a decadal context, and the investigators exploit a rich suite of legacy data to better understand the present and immediate future of Caribbean coral reefs. This four-year project will advance on two concurrent fronts: first, to extend time-series analyses of octocoral communities from four to eight years to characterize the pattern and pace of change in community structure, and second, to conduct a program of hypothesis-driven experiments focused on octocoral settlement that will uncover the mechanisms allowing octocorals to more effectively colonize substrata than scleractinian corals on present day reefs. Specifically, the investigators will conduct mensurative and manipulative experiments addressing four hypotheses focusing on the roles of: (1) habitat complexity in distinguishing between octocoral and scleractinian recruitment niches, (2) the recruitment niche in mediating post-settlement success, (3) competition in algal turf and macroalgae in determining the success of octocoral and scleractian recruits, and (4) role of octocoral canopies in modulating the flux of particles and larvae to the seafloor beneath. The results of this study will be integrated to evaluate the factors driving higher ecological resilience of octocorals versus scleractinians on present-day Caribbean reefs.

This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.



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Funding

Funding SourceAward
NSF Division of Ocean Sciences (NSF OCE)

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