2012

Ruttenberg BI, PJ Schofield, JL Akins, A Acosta, MW Feeley, J Blondeau, SG Smith, and JS Ault

Over the past decade, Indo-Pacific lionfishes have invaded and spread throughout much of the tropical and subtropical northwestern Atlantic Ocean and Caribbean Sea. These species are generalist predators of fishes and invertebrates with the potential to disrupt the ecology of the invaded range. Lionfishes have been present in low numbers along the east coast of Florida since the 1980s, but were not reported in the Florida Keys until 2009. This paper uses data from the 20,000+ REEF surveys conducted in Florida since the early 1990s, along with other long-term data sources, to document the appearance and rapid spread of lionfishes in the Florida Keys. The results are the first to quantify the invasion of lionfishes in a new area using multiple independent, ongoing monitoring data sets, two of which have explicit estimates of sampling effort. Between 2009 and 2011, lionfish frequency of occurrence, abundance, and biomass increased rapidly, increasing three- to six-fold between 2010 and 2011 alone. In addition, individuals were detected on a variety of reef and non-reef habitats throughout the Florida Keys. Because lionfish occurrence, abundance, and impacts are expected to continue to increase throughout the region, monitoring programs like REEF's Volunteer Survey Project will be essential to document ecosystem changes that may result from this invasion.

Bulletin of Marine Science
88(4):1051–1059
2012
Program: 
Invasive Species Program
Burge EJ, JD Atack, C Andrews, BM Binder, ZD Hart, AC Wood, E Bohrer, and K Jagannathan

The authors of this study observed grouper and and their associated reef fish assemblage using scuba and underwater stationary videography during a 7-mo period. Fifty-seven sites around Cape Fear, NC, were visited with stationary video and diver point counts of groupers were taken at each site. Data collected as part of the REEF Volunteer Fish Survey Project, as well as several other datasets, were used to compare with the study results. Similar to other comparative studies previously published, the authors found that different survey methodologies have varying success at detecting even common species.

Bulletin of Marine Science
8(1): 15-38
2012
Program: 
Volunteer Fish Survey Project

2011

Auster, P.J., D. Grenda, J. Godfrey, E. Heupel, S. Auscavitch, and J. Mangiafico

REEF Advanced Assessment Team Member, Dave Grenda, recently co-authored a paper documenting behavioral observations of young Great Barracuda occurring on live bottom sub-tropical reefs primarily at Gray's Reef National Marine Sanctuary off the coast of Georgia. For the past three years Dave assisted University of Connecticut researcher, Dr. Peter Auster, in studying behavioral interactions of piscivores and their prey. During REEF surveys on these cruises, Dave and the other researchers documented young-of-year (YOY) Great Barracuda (those individuals that had very recently settled to the reef, and were between 2-3 inches in length) hunting YOY Tomtate and Silverside that were taking refuge under ledges. Groups of YOY Barracuda would attack, capture, and consume the prey. Prey that escaped the Barracuda retreated to reef edges and were often consumed by bottom-dwelling adult piscivores such as Black Sea Bass, Bank Sea Bass, and Scamp Grouper. These findings indicate that given the strong functional role the young Barracuda have on driving species interactions, greater attention should be given to the roles played by the wider diversity of YOY piscivores recruiting to reef communities.

Southeastern Naturalist
10(3):563-569
2011
Program: 
Volunteer Fish Survey Project
Koenig, CC, FC Coleman, and K Kingon

This paper reviewed the population status of Atlantic goliath grouper, Epinephelus itajara, in coastal waters of the southeastern United States. The study is based on quantitative surveys conducted by the authors and the Florida Fish and Wildlife Conservation Commission’s Artificial Reef Program (n = 505), coupled with data submitted by REEF surveyors (n = 27,542) over 15+ yrs. The primary objective of the study is to describe the distribution and abundance of the goliath grouper population of the southeastern US with a focus on Florida, the center of US abundance for this species, the center for the historical fishery, and now the center of much controversy. A secondary, but quite important objective is to demonstrate the utility of using existing databases, such as that of REEF to provide what often amounts to the best scientific data available for informing management decisions, particularly in areas and for species for which there is no traditional fishery- dependent data collection. The authors found that the population of goliath grouper, after dramatic fishery-induced declines in the 1970s and 1980s, and eventual fishery closure in the 1990s, increased off southwest Florida in the mid-1990s, directly offshore of the high-quality mangrove nursery of the Ten Thousand Islands. It then expanded north and south, eventually increasing off Florida’s central east coast. The study also evaluated tagging data, which showed that, regardless of life stage, individuals showed strong site fidelity to home sites: juveniles to mangrove nursery sites and adults to offshore reefs. All long-distance movements appeared to be in response to approaching maturity, with juveniles emigrating from mangroves to take up residence on offshore reefs, to seasonal spawning activity, with adults moving from home sites to aggregation sites, or to apparent feeding sites in inlets. Understanding these patterns of population recovery and movement is fundamental to devising appropriate management policies.

Bulletin of Marine Science
87: doi:10.5343/bms.2010.1056
2011
Program: 
Volunteer Fish Survey Project

2010

Ward-Paige CA, Mora C, Lotze HK, Pattengill-Semmens C, McClenachan L, et al.

In recent decades, large pelagic and coastal shark populations have declined dramatically with increased fishing; however, the status of sharks in other systems such as coral reefs remains largely unassessed despite a long history of exploitation. The authors used REEF data to explore the contemporary distribution and sighting frequency of sharks on reefs in the greater-Caribbean, and assessed the possible role of human pressures on observed patterns. The analysis was based on 76,340 underwater surveys carried out by REEF volunteers between 1993 and 2008. The authors compared sighting frequency to the number of people in each area surveyed, and used population viability analyses to assess the effects of exploitation on population trends. Sharks, with the exception of nurse sharks occurred mainly in areas with very low human population or strong fishing regulations and marine conservation. Population viability analysis suggests that exploitation alone could explain the large-scale absence; however, this pattern is likely to be exacerbated by additional anthropogenic stressors, such as pollution and habitat degradation, that also correlate with human population. Preventing further loss of sharks requires urgent management measures to curb fishing mortality and to mitigate other anthropogenic stressors to protect sites where sharks still exist. The fact that sharks still occur in some densely populated areas where strong fishing regulations are in place indicates the possibility of success and encourages the implementation of conservation measures.

PLoS ONE
5(8): e11968. doi:10.1371/journal.pone.0011968
2010
Program: 
Volunteer Fish Survey Project
Holt, B., I Cote, and B Emerson

Hamlets are a group of colourful coral reef fish found throughout the Caribbean. Ten species of hamlet have been discovered and each can be easily recognized by its own distinct colour pattern. In some areas, as many as seven varieties can be found on a single reef. However, most hamlet species are only found at specific locations. The blue hamlet, for example, is found only in the Florida region. How these very different looking, yet very closely related species came to be has been a a subject of debate among scientists. Data collected by divers and snorkelers as part of the REEF Volunteer Fish Survey Project were used in a large analysis to better understand the patterns of evolution in these and other marine fishes. They found that even widespread hamlet species are not found everywhere, and identified high density hotspots for each species. Because different species hotspots overlap and many species have more than one hotspot, the results do not support the theory that hamlets originated independently when they were geographically separated in the past. The research also showed how ecological factors, such as competition for food or habitat, may influence how different hamlet species co-exist. To contact the lead author - bholt@bio.ku.dk

Global Ecology and Biogeography
19: 432–441
2010
Program: 
Volunteer Fish Survey Project
Ward-Paige, C.A., C.V. Pattengill-Semmens, R.A. Myers, and H.K. Lotze

Recent concerns about changing elasmobranch populations have prompted the need to understand their patterns of distribution and abundance through non-destructive sampling methods. Since scientific divers represent a small portion of the total number of divers worldwide, the use of non-scientific divers could drastically increase the number of observations needed to monitor broad-scale, long-term trends. Here, we use 83,940 surveys collected by trained volunteer divers to examine spatial and temporal trends of the most frequently sighted elasmobranch species in the greater-Caribbean, the yellow stingray (Urobatis jamaicensis). Despite being relatively common and listed as Least Concern on the IUCN Red List, little is known about the status of this species. In total, yellow stingrays were observed on 5,658 surveys (6.7% sighting frequency) with the highest occurrence in the regions surrounding Cuba. Overall, sighting frequency declined from 20.5% in 1994 to 4.7% in 2007—a standardized decline rate of −0.11. However, these trends were not consistent in all regions. The strongest decline occurred in the Florida Keys, the most sampled region, where trends were similar among all areas, habitats and depths. In contrast, sighting frequency significantly increased in Jamaica where large fishes are severely depleted. We discuss possible explanations for these changes including habitat degradation, exploitation and changes in trophic interactions. Our results suggest large-scale changes in yellow stingray abundance that have been unnoticed by the scientific community. Thus, our study highlights the value of non-scientific divers for collecting data that can be used to understand population trends of otherwise poorly studied species.

Environmental Biology of Fishes
90:263–276
2010
Program: 
Volunteer Fish Survey Project

the mismatch between genetic and phenotypic divergence among deeply divided mtDNA lineages in a coral-reef goby, with the description of two new cryptic species from the Caribbean Sea

Victor, B.C.

Long-time REEF supporters, Les and Keri Wilk of ReefNet, recently discovered and photographed a distinctively marked population of the Greenbanded Goby, Elacatinus multifasciatus, on the island of Utila, Honduras. The population was distinguished by a prominent red stripe across the cheek that is not found on other populations of Greenbanded Gobies, as well as more numerous green bars on the body. The Wilks contacted Dr. Ben Victor, a reef fish taxonomic expert, who conducted a regional genetic comparison of Greenbanded Gobies to evaluate hidden diversity within this colorful and cryptic reef fish. As part of the study, the REEF database was used to document the current geographic range of the species. Ben's results identified the unique looking fish to be a separate species that is now called the Redcheek Goby (E. rubrigenis). He also discovered that, based on genetic results, Greenbanded Goby along coastal Panama, despite looking just like others in the species, are most likely a distinct species that will now be called Panamanian Greenbanded Goby (E. panamensis)

Journal of the Ocean Science Foundation
Vol 3, 15 April 2010
2010
Program: 
Volunteer Fish Survey Project

2009

Stallings, C

Understanding the current status of predatory fish communities, and the effects fishing has on them, is vitally important information for management. However, data are often insufficient at region-wide scales to assess the effects of extraction in coral reef ecosystems of developing nations. The author overcomes this difficulty by using REEF's large database from the Volunteer Survey Project, which is a publicly accessible, fisheries-independent database. The aim of the study was to provide a broad scale, comprehensive analysis of human impacts on predatory reef fish communities across the greater Caribbean region. Specifically, this study analyzed presence and diversity of predatory reef fishes over a gradient of human population density. Across the region, as human population density increases, presence of large-bodied fishes declines, and fish communities become dominated by a few smaller-bodied species. The analysis found a complete disappearance of several large-bodied fishes, which indicates ecological and local extinctions have occurred in some densely populated areas. These findings fill a fundamentally important gap in our knowledge of the ecosystem effects of artisanal fisheries in developing nations, and provide support for multiple approaches to data collection where they are commonly unavailable.

PLoS One
4(5): e5333
2009
Program: 
Volunteer Fish Survey Project
Morris JA and JL Akins

In this early paper, staff from REEF and NOAA studied feeding ecology of the invasive lionfish (Pterois volitans). The authors collected stomach content data from fishes taken throughout the Bahamian archipelago. Three relative metrics of prey quantity, including percent number, percent frequency, and percent volume, were used to compare three indices of dietary importance. Lionfish largely prey upon teleosts (78% volume) and crustaceans (14% volume). Twenty-one families and 41 species of teleosts were represented in the diet of lionfish; the top 10 families of dietary importance were Gobiidae, Labridae, Gram- matidae, Apogonidae, Pomacentridae, Serranidae, Blenniidae, Atherinidae, Mullidae, and Monacanthi- dae. The proportional importance of crustaceans in the diet was inversely related to size with the largest lionfish preying almost exclusively on teleosts. Lion- fish were found to be diurnal feeders with the highest predation occurring in the morning (08:00–11:00).

Journal of Environmental Biology of Fishes
86(3): 389-398
2009
Program: 
Invasive Species Program

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