| NSF Org: |
OCE Division Of Ocean Sciences |
| Recipient: |
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| Initial Amendment Date: | April 25, 2019 |
| Latest Amendment Date: | April 25, 2019 |
| Award Number: | 1928761 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Daniel J. Thornhill
OCE Division Of Ocean Sciences GEO Directorate for Geosciences |
| Start Date: | May 1, 2019 |
| End Date: | April 30, 2020 (Estimated) |
| Total Intended Award Amount: | $30,451.00 |
| Total Awarded Amount to Date: | $30,451.00 |
| Funds Obligated to Date: |
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| History of Investigator: |
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| Recipient Sponsored Research Office: |
266 WOODS HOLE RD WOODS HOLE MA US 02543-1535 (508)289-3542 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
183 Oyster Pond Road Woods Hole MA US 02543-1041 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | BIOLOGICAL OCEANOGRAPHY |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
Title: Predicting the Spread of Multi-Species Coral Disease Using Species Immune Traits
Coral reef ecosystems provide substantial economic resources to the societies of the United States Virgin Islands (USVI) and other US locations in the forms of tourism, fishing and coastal protection. However, reefs are among the most threatened marine environments, and coral disease is having a devastating impact on these valued systems. In early 2019, a multi-species rapid tissue loss disease matching the description of stony coral tissue loss disease (SCTLD) was found severely affecting a reef off the southwest coast of St. Thomas in the US Virgin Islands (USVI). SCTLD has been devastating coral reef communities in southeast Florida for the last four years, and was very recently reported from disparate areas around the Caribbean, including Mexico, Jamaica, and St. Martin. Rapid surveys by the investigators at the University of the Virgin Islands believe that a 50 km2 area southwest of St. Thomas is the initial incidence area of the disease, but will likely spread across the USVI, British Virgin Islands, and Puerto Rico. This study performs experiments to understand how this disease affects coral species immune traits and compares the microbiology and physiology of disease samples in the USVI to samples from Florida. It also examines how changing the species composition of a coral community affects the spread and impact of the disease. The overall aim is to produce a model to predict the impact of multi-species disease spread on reefs based on coral species assemblages. The project contributes to the research training of at least 2 undergraduates, 2 M.S. students, and 3 Ph.D. students, who benefit from cross-investigator mentoring. The research team includes representatives to the Coral Disease Advisory Committees for the USVI and Florida, which ensures rapid communication of findings to management bodies in both regions.
Coral disease is a significant and increasing threat to Caribbean coral reef systems. Recent results demonstrate that coral species immune traits can predict disease resistance, and thus, forecast impacts to coral community structure, under multi-species coral disease. The onset of this epizootic in the USVI offers an unprecedented opportunity to test hypotheses about the impact of coral resistance, tolerance and immune traits on disease spread during the early stages of an outbreak that could profoundly change the diversity of Caribbean reefs. It is hypothesized that the abundance of highly susceptible species dictates 1) the onset of disease at reef sites downstream of the initial incidence area, and 2) the spread of disease within reef sites. Furthermore, 3) downstream reef sites where highly susceptible species are removed or treated show lower immune responses in all susceptible corals, later onset of disease, and slower within-site disease spread. To test these hypotheses, two experiments directly compare species responses to disease exposure and test the effect of species assemblage on coral immune function and disease spread. Results from these experiments aim to inform a generalizable model to predict the impact of multi-species disease spread on reefs based on coral species assemblages. Results of this project include direct comparison of the USVI disease to Florida SCTLD and a better understanding of how the abundance of highly susceptible host species impacts the spread of disease during the early onset of a multi-species panzootic.
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.
PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
Coral reef ecosystems provide substantial economic resources to the societies of the United States Virgin Islands (USVI) and other US locations in the forms of tourism, fishing and coastal protection. However, reefs are among the most threatened marine environments, and coral disease is having a devastating impact on these valued systems. In early 2019, a multi-species rapid tissue loss disease matching the description of stony coral tissue loss disease (SCTLD) was found severely affecting a reef off the southwest coast of St. Thomas in the US Virgin Islands (USVI). This study examined how this disease affects coral species and compares the microbiology and physiology of disease samples in the USVI to samples from Florida. It also examined how changing the species composition of a coral community affects the spread and impact of the disease. Our studies demonstrated that coral species demonstrated differential responses to disease exposure, with Orbicella annularis showing the highest susceptibility, followed by Diploria labyrinthiformis, Pseudodiploria strigosa, Porites astreoides and finally Montastrea cavernosa at lowest risk for the disease. We identified bacterial taxa enriched in two or more coral species, and identified these as potential “disease indicator bacteria”. These 14 taxa spanned the families: Rhodobacteraceae, Prolixibacteraceae, Vibrionaceae, Arcobacteraceae, Flavobacteriaceae, Clostridiales Family XII, Marinilabiaceae, and Saprospiraceae. Across all samples, an unclassified Rhodobacteraceae was present in all species of infected coral. Comparing these taxa to studies of Florida’s disease outbreak revealed that Vibrio, Fusibacter and Thalassobius were in common between this study and those in Florida. These results suggest that there are likely multiple bacteria playing roles in causing this disease. Interestingly, there was a shift in the mucus microbiota of two coral species from a healthy to diseased state in colonies that were exposed to disease but that did not develop lesions. This suggests a promising non-lethal method to sample and detect SCTLD before visual lesions develop.
Coral disease is a significant and increasing threat to Caribbean coral reef systems. Overall, this project provided a better understanding of how the abundance of highly susceptible host species impacts the spread of disease during the early onset of a multi-species panzootic and the microorganisms (potentially pathogens) involved in the coral infections. The project contributed to the research training of multiple graduate students, including students two based at the Woods Hole Oceanographic Institution. Results of this project were widely communicated through a virtual public event viewed by over 4000 households as well as through 13 public news stories.
Last Modified: 11/06/2020
Modified by: Amy Apprill
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