Project: RUI: Pattern and process in four decades of change on Caribbean reefs

Acronym/Short Name:St John Coral Reefs
Project Duration:2020-10 - 2025-09
Geolocation:United States Virgin Islands, St. John: 18.318, -64.7253

Description

NSF Award Abstract:
The coral reef crisis refers to the high rates of death affecting tropical reef-building corals throughout the world, and the strong likelihood that coral reefs will become functionally extinct within the current century. Knowledge of these trends comes from the monitoring of coral reefs to evaluate their health over time, with the most informative projects providing high-resolution information extending over decades. Such projects describe both how reefs are changing, and answer questions addressing the causes of the changes and the form in which reefs will persist in the future. This project focuses on coral reefs in United States waters, specifically around St. John in the US Virgin Islands. These reefs are protected within the Virgin Islands National Park, and have been studied more consistently and in greater detail than most reefs anywhere in the world. Building from 33 years of research, this project extends monitoring of these habitats by another five years, and uses the emerging base of knowledge, and the biological laboratory created by the reefs of St. John, to address the causes and consequences of the bottleneck preventing baby corals from repopulating the reefs. The work is accomplished with annual expeditions, staffed by faculty, graduate students, undergraduates, and teachers, coupled with analyses of samples at California State University, Northridge, and Florida State University, Tallahassee. The students and teachers assist with the research goals at the center of this project, but also engage in independent study and integrate with the rich and diverse societal context and natural history of the Caribbean. The scope of the science agenda extends to schools in California, where students are introduced to the roles played by marine animals in ecosystem health, concepts of long-term change in the biological world, and the role of science engagement in promoting positive environmental outcomes. In addition to generating a wide spectrum of project deliverables focusing on scientific discovery, the project promotes STEM careers and train globally aware scientists and educators capable of supporting the science agenda of the United States in the 21st Century.

This project leverages one of the longest time-series analyses of Caribbean coral reefs to extend the time-series from 33 to 38 years, and it tests hypotheses addressing the causes and consequences of changing coral reef community structure. The project focuses on reefs within the Virgin Islands National Park (VINP) and along the shore of St. John, US Virgin Islands, and is integrated with stakeholders working in conservation (VINP) and local academia (University of the Virgin Islands). Beginning in 1987, the project has addressed detail-oriented analyses within a small spatial area that complements the large-scale analyses conducted by the VINP. The results of these efforts create an unrivaled context within which ecologically relevant hypotheses can be tested to elucidate mechanisms driving ecological change. Building from image- and survey- based analyses, 33 years of data reveal the extent to which these reefs have transitioned to a low-abundance coral state, and the importance of the bottleneck preventing coral recruits from contributing to adult size classes. The intellectual merits of this project leverage these discoveries to address eight hypotheses: (H1) long-term changes are defining a cryptic regime change, with the low coral abundance reinforced by, (H2) enhanced community resilience, (H3) low post-settlement success, (H4) negative effects of peyssonnelid algal crusts (PAC) on juvenile corals, (H5) inability of juvenile corals to match their phenotypes to future conditions, (H6) impaired population growth caused by reduced genetic diversity, (H7) the premium placed on PAC-free halos around Diadema sea urchins for coral recruitment, and (H8) biotic homogenization occurring on a landscape-scale.

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.

Related Projects:


DatasetLatest Version DateCurrent State
2023-06-30Preliminary and in progress
Coral calcification (G) from six sites on the south coast of St. John, USVI from 1992 to 20192023-06-14Final no updates expected
Coral sizes from six sites on the south coast of St. John, USVI from 1992 to 20192023-06-14Final no updates expected
Coral density from six sites on the south coast of St. John, USVI from 1992 to 20192023-06-14Final no updates expected
Coral cover at six sites on the south coast of St. John, USVI from 1992 to 20192023-06-14Final no updates expected
Light intensity (lux) of downwelling light upon the benthos along differing conditions of octocoral canopy formation in East Cabritte, in Grootpan Bay, St. John U.S. Virgin Islands in March of 20192023-03-21Final no updates expected
Benthic invertebrate abundances associated with octocoral forests in St. John, US Virgin Islands from July 2019 to Jan 20202023-03-21Final no updates expected
Pulse Amplitude Modulation (PAM) fluorometer measurements from Porites astreoides colonies in St. John, US Virgin Islands from July to August of 20192023-03-21Final no updates expected
Simultaneous light intensity measurements from a HOBO light intensity logger and a cosine-corrected PAR sensor in Lameshur Bay, St. John, U.S. Virgin Islands in January of 20212023-03-21Final no updates expected
Canopy closure values from photographs taken within octocoral forests in Lameshur Bay St. John, U.S. Virgin Islands from July 2019 to Jan 20202023-03-21Final no updates expected
Steady state photosynthesis (photosynthetic induction time) from Porites astreoides colonies in St. John, US Virgin Islands from July to August of 20192023-03-21Final no updates expected
Canopy closure values from photographs taken within octocoral forestsalong the south shore of St. John, U.S. Virgin Islands in March of 20192023-03-21Final no updates expected
Octocoral height, density, and genera from in situ observations within octocoral forests in Lameshur Bay St. John, U.S. Virgin Islands from July 2019 to Jan 20202023-03-21Final no updates expected
Octocoral canopy metrics (mean height, density, and closure) in St. John, US Virgin Islands in March of 20192023-03-21Final no updates expected
Light intensity (lux) of downwelling light upon the benthos along differing conditions of octocoral canopy formation in Lameshur Bay St. John, U.S. Virgin Islands in March of 20192023-03-21Final no updates expected
Daily seawater temperature at Yawzi Point (St.John USVI) from 1991-20212022-06-15Final no updates expected
Morphology and features of Millepora colonies at Cabritte Horn (St.John, US Virgin Islands) from 1992-20212022-06-13Final no updates expected
Abundance and percent cover of macroalgae at Cabritte Horn (St.John, US Virgin Islands) from 1992-20202022-06-10Final no updates expected
Abundance and percent cover of Millepora species at Cabritte Horn (St.John, US Virgin Islands) from 1992-2021 2022-06-09Final no updates expected
Percent cover of organisms within quadrats surveyed during surveys of 12 sites around St. Thomas and St. John, US Virgin Islands from 2011-20212022-03-25Final no updates expected
Density of sea fans from surveys in St. John, US Virgin Islands in August of 20202022-02-11Final no updates expected
Height of sea fans from surveys in St. John, US Virgin Islands in August of 20202022-02-11Final no updates expected
Density of juvenile corals on reef surfaces in St. John, US Virgin Islands from 1994 to 20202021-06-23Final no updates expected
Juvenile Porites along transects in St. John, US Virigin Islands between 1994 and 20202021-06-23Final no updates expected
Survival of juvenile corals in St. John, US Virigin Islands, annual mortality from 1996 to 20202021-06-23Final no updates expected
Density of coral recruits on settlement tiles in St. John, US Virigin Islands between 2007 and 20202021-06-23Final no updates expected

Project Home Page


People

Principal Investigator: Peter J. Edmunds
California State University Northridge (CSUN)

Contact: Peter J. Edmunds
California State University Northridge (CSUN)


Data Management Plan

DMP_Edmunds_OCE-2019992.pdf (414.92 KB)
02/09/2025