|Hixon, Mark||Oregon State University (OSU)||Lead Principal Investigator|
|Pusack, Timothy J||Oregon State University (OSU)||Scientist|
|Rauch, Shannon||Woods Hole Oceanographic Institution (WHOI BCO-DMO)||BCO-DMO Data Manager|
The investigators examined the interactions between invasive lionfish and native Nassau grouper using both a manipulative field study and a controlled lab experiment. This dataset, resulting from the field study, contains counts of small reef fishes (< 50 mm) on the artificial and transplant reefs where the abundances of Nassau grouper were controlled.
Pusack, TJ. Submitted. Evidence of bioltic resistance: native Nassau grouper (Epinephelus striatus) mitigate predator effects of invasive Pacific red lionfish (Pterois volitans) on Atlantic coral reefs. Ecological Applications.
Raymond WW, MA Albins, and TJ Pusack. In Review. Shelter competition between invasive Pacific red lionfish Pterois volitans) and native Nassau grouper (Epinephelus striatus). Journal of Experimental Marine Biology and Ecology.
During the summer of 2010, the investigators manipulated the abundance of Nassau grouper on 28 near-shore patch reefs and measured the growth and survival of juvenile (20-140 mm) lionfish. They also censused the community of small reef fishes (< 50 mm) to look for evidence of indirect effects that grouper might have mediated through lionfish.
BCO-DMO Processing Notes:
- Modified parameter names to conform with BCO-DMO naming conventions.
- Replaced blanks with 'nd' ('no data') in the time_start, time_end, phase, non_fish_abund, and notes column.
- Replaced blanks with zeroes in the size bins.
- Transposed size bins to rows in lowest level of data.
- Added lat and lon from the metadata provided.
- 09-Jan-2018: removed embargo on dataset.
|site||Name of the site.||text|
|lat_site||Latitude of the site.||decimal degrees|
|lon_site||Longitude of the site.||decimal degrees|
|treatment||Indicates whether the survey was a Baseline (no treatment) or the number of Nassau grouper present on the reef. EPST = Nassau grouper.||dimensionless|
|location||Indicates the specfic patch reef in the matrix.||text|
|reef_type||Indicates whether the reef was an artifical reef (ART) 1 m^3 concrete block or a translocated reef (TRANS) 3.5 m^2.||text|
|day||2-digit day-of-month of survey.||dd (01 to 31)|
|month||2-digit month of survey.||mm (01 to 12)|
|year||4-digit year of survey.||YYYY|
|time_start||Beginning time of the survey; 24-hour time.||HHMM|
|time_end||Ending time of the survey; 24-hour time.||HHMM|
|census_type||Indicates whether a full census of all reef fish or a recruit only census of fish||text|
|person1||Identity of primary observer (TP = Timothy Pusack)||text|
|person2||Identity of secondary observer (WR = Wendel Raymond; JL = Julia Lawson; CK = Courtney Kewl; TG = Tiffany Gray; KI = Kurt Ingeman)||text|
|species_code||4-letter genus species code (typically first two letters are the first two of the genus and last two letters are the first two of the species). See the Species list to match the code to the full scientific name.||code|
|phase||N = juvenile or intermediate or fish without distinct post-settlement life stages; T = terminal phase.||text|
|non_fish_abund||0 if species is a fish. Otherwise count of specific invertebrate on particular subsample.||integer|
|notes||Notes associated with a particular observation. May refer to data entry related or QA/QC related notes.||text|
|lenbin_min||Minimum of length bin range (centimeters).||cm|
|lenbin_max||Maximum of length bin range (centimeters).||cm|
|count||Count of a particular species falling into the size bin.||integer|
Tropical Marine Lab at Lee Stocking Island
|Start Date|| |
|End Date|| |
Locations of coral reef survey dives and sightings, or collections of the invasive red lionfish, Pterois volitans, near Lee Stocking Island, Bahamas for the projects "Ecological Release and Resistance at Sea: Invasion of Atlantic Coral Reefs by Pacific Lionfish" and "Mechanisms and Consequences of Fish Biodiversity Loss on Atlantic Coral Reefs Caused by Invasive Pacific Lionfish" (NSF OCE-0851162 & OCE-1233027). All dives were made from various small vessels (17' to 24' l.o.a., 40 to 275 HP outboard motors, 1 to 7 GRT). Vessel names include, Sampson, Orca, Potcake, Lusca, Lucaya, Zardoz, Parker, and Nuwanda.
Invasive species are increasingly introduced by human activities to new regions of the world where those species have never existed previously. In the absence of natural enemies (predators, competitors, and diseases) from their homeland, invasives may have strong negative effects on invaded ecosystems, especially systems with fewer species ("ecological release"), and may even drive native species extinct. However, if native natural enemies can somehow control the invaders ("ecological resistance"), then ecological disruption can be prevented or at least moderated. Most of the many invasive species in the sea have been seaweeds and invertebrates, and the few documented invasive marine fishes have not caused major problems. However, this situation has recently changed in a stunning and ominous way. In the early 1990s, lionfish (Pterois volitans) from the Pacific Ocean were accidentally or intentionally released from aquaria to the ocean in the vicinity of Florida. Camouflaged by shape and color, protected by venomous spines, consuming native coral-reef fishes voraciously, and reproducing rapidly, lionfish have subsequently undergone a population explosion. They now range from the mid-Atlantic coast of the US to the Caribbean, including the Bahamas. Native Atlantic fishes have never before encountered this spiny, stealthy, efficient predator and seldom take evasive action. In fact, the investigator has documented that a single lionfish is capable of reducing the abundance of small fish on a small coral patch reef by nearly 80% in just 5 weeks. There is great concern that invasive lionfish may severely reduce the abundance of native coral-reef fishes important as food for humans (e.g., grouper and snapper in their juvenile stages) as well as species that normally maintain the integrity of coral reefs (e.g., grazing parrotfishes that can prevent seaweeds from smothering corals). There are far more species of coral-reef fish in the Pacific than the Atlantic, so this invasion may represent a case of extreme ecological release with minor ecological resistance. Dr. Hixon and colleagues will study the mechanisms of ecological release in lionfish, as well as examine potential sources of ecological resistance in the heavily invaded Bahamas. Because very little is known about the ecology and behavior of lionfish in their native Pacific range, he will also conduct comparative studies in both oceans, which may provide clues regarding the extreme success of this invasion. In the Bahamas, the investigator will document the direct and indirect effects on native species of the ecological release of lionfish, both as a predator and as a competitor. These studies will be conducted at various scales of time and space, from short-term experiments on small patch reefs, to long-term experiments and observations on large reefs. Whereas direct effects involve mostly changes in the abundance of native species, indirect effects can be highly variable. For example, lionfish may actually indirectly benefit some native species by either consuming or outcompeting the competitors of those natives. The project will explore possible ecological resistance to the invasion by determining whether any native Bahamian species are effective natural enemies of lionfish, including predators, parasites, and competitors of both juvenile and adult lionfish. Comparative studies of natural enemies, as well as lionfish ecology and behavior, in both the Atlantic and the Pacific may provide clues regarding the explosive spread of lionfish in the Atlantic.
Regarding broader impacts, this basic research will provide information valuable to coral-reef and fisheries managers fighting the lionfish invasion in the US, the Bahamas, and the greater Caribbean, especially if sources of native ecological resistance are identified. The study will fund the PhD research of U.S. graduate students, as well as involve assistance and participation by a broad variety of undergraduates and reef/fisheries managers, including women, minorities, native Bahamians, and native Pacific islanders. Participation in this project will promote education in marine ecology and conservation biology directly via Dr. Hixon's and graduate students' teaching and outreach activities, and indirectly via the experiences of undergraduate field assistants and various associates.