Abel Valdivia

Abel Valdivia
University of North Carolina at Chapel Hill | UNC · Department of Biology

Ph.D Biology

About

30
Publications
10,282
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520
Citations
Citations since 2016
6 Research Items
392 Citations
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20162017201820192020202120220204060
20162017201820192020202120220204060
20162017201820192020202120220204060

Publications

Publications (30)
Article
Accelerating ecosystem degradation has spurred proposals to vastly expand the extent of protected areas (PAs), potentially affecting the livelihoods and well-being of indigenous peoples and local communities (IPLCs) worldwide. The benefits of multiuse PAs that elevate the role of IPLCs in management have long been recognized. However, quantitative...
Article
Full-text available
Disease, storms, ocean warming, and pollution have caused the mass mortality of reef-building corals across the Caribbean over the last four decades. Subsequently, stony corals have been replaced by macroalgae, bacterial mats, and invertebrates including soft corals and sponges, causing changes to the functioning of Caribbean reef ecosystems. Here...
Article
Full-text available
Invasive lionfish are assumed to significantly affect Caribbean reef fish communities. However, evidence of lionfish effects on native reef fishes is based on uncontrolled observational studies or small-scale, unrepresentative experiments, with findings ranging from no effect to large effects on prey density and richness. Moreover, whether lionfish...
Data
Appendix: Supplemental Text, Tables, and Figures
Article
Full-text available
The global decline of reef-building corals is understood to be due to a combination of local and global stressors. However, many reef scientists assume that local factors predominate and that isolated reefs, far from human activities, are generally healthier and more resilient. Here we show that coral reef degradation is not correlated with human p...
Preprint
Full-text available
The natural, pre-human, abundance of most large predators is unknown due to the lack of historical data and the poor understanding of the natural factors that control their populations. We assessed the relationship between the biomass of predatory reef fishes and several anthropogenic and environmental variables to (1) predict among site variabilit...
Preprint
The natural, pre-human, abundance of most large predators is unknown due to the lack of historical data and the poor understanding of the natural factors that control their populations. We assessed the relationship between the biomass of predatory reef fishes and several anthropogenic and environmental variables to (1) predict among site variabilit...
Article
Full-text available
Biotic resistance is the idea that native species negatively affect the invasion success of introduced species, but whether this can occur at large spatial scales is poorly understood. Here we re-evaluated the hypothesis that native large-bodied grouper and other predators are controlling the abundance of exotic lionfish (Pterois volitans/miles) on...
Preprint
Biotic resistance is the idea that native species negatively affect the invasion success of introduced species, but whether this can occur at large spatial scales is poorly understood. Here we re-evaluated the hypothesis that native large-bodied grouper and other predators are controlling the abundance of exotic lionfish (Pterois volitans/miles) on...
Preprint
Full-text available
Biotic resistance is the idea that native species negatively affect the invasion success of introduced species, but whether this can occur at large spatial scales is poorly understood. Here we re-evaluated the hypothesis that native large-bodied grouper and other predators are controlling the abundance of exotic lionfish (Pterois volitans/miles) on...
Article
Full-text available
Marine reserves can restore fish abundance and diversity in areas impacted by overfishing, but the effectiveness of reserves in developing countries where resources for enforcement are limited, have seldom been evaluated. Here we assess whether the establishment in 1996 of the largest marine reserve in the Caribbean, Gardens of the Queen in Cuba, h...
Preprint
Biotic resistance is the idea that native species negatively affect the invasion success of introduced species. We tested the hypothesis that native grouper are controlling the abundance of exotic lionfish on Caribbean coral reefs by assessing the relationship between the density and biomass of lionfish and native predators at 71 reefs in three bio...
Preprint
Full-text available
Biotic resistance is the idea that native species negatively affect the invasion success of introduced species. We tested the hypothesis that native grouper are controlling the abundance of exotic lionfish on Caribbean coral reefs by assessing the relationship between the density and biomass of lionfish and native predators at 71 reefs in three bio...
Preprint
Full-text available
Effective marine reserves can restore fish abundance and diversity in areas impacted by overfishing, but the outcomes of some reserves in developing countries where resources for enforcement are limited have seldom been evaluated. Here we assess whether the establishment of the largest marine reserve in the Caribbean has had a positive effect on th...
Preprint
Effective marine reserves can restore fish abundance and diversity in areas impacted by overfishing, but the outcomes of some reserves in developing countries where resources for enforcement are limited have seldom been evaluated. Here we assess whether the establishment of the largest marine reserve in the Caribbean has had a positive effect on th...
Article
Full-text available
Biotic resistance, the process by which new colonists are excluded from a community by predation from and/or competition with resident species, can prevent or limit species invasions. We examined whether biotic resistance by native predators on Caribbean coral reefs has influenced the invasion success of red lionfishes (Pterois volitans and Pterois...
Data
Spline correlograms, with 95% point wise bootstrap confidence intervals, of the Pearson residuals for each generalized liner mixed effects logistic regression model including all the explanatory variables fitted to the data. (TIFF)
Data
Relationship between lionfish density and biomass estimates. Each point represents a transect mean. The Pearson’s product-moment correlation between lionfish biomass and lionfish density was 0.95, p<0.01. (TIFF)
Data
Total predator biomass on protected and unprotected Caribbean reefs. The biomass of native predatory fishes on 17 protected sites (no-take marine reserves) and on 55 unprotected or non-reserve reefs. Average predator biomass was significantly higher at sites inside marine reserves (135.4 g/m2) than in non-reserve sites (37.7 g/m2); t = −4.5933, p =...
Data
Survey locations across the Caribbean Study sites, site codes, regions, and protection level. Habitat type, S&G: Spur and Grove; Patch: Patch Reef. Protection level, NTZ: No-take zone; MPA: marine protected area; GUA: general used area. Permit, Yes: Permit Obtained (Permits for The Bahamas, Belize, and Mexico covered all sites); Not Req.: Permit wa...
Data
Field survey permit information. (DOCX)
Data
Reef fish predator species used in the study. Taxonomic information, food guild and trophic groups of the predator species used in the analysis. Guild and trophic information was obtained from Fish-Base [16]. (PDF)
Article
Full-text available
In coral reefs, restoration actions often involve artificial construction since physical structure enhances physico-chemical conditions for benthic communities and provides habitat for reef-associated fauna. We evaluated the performance of 4 restoration structures (RS, aged 5 to 12 yr) by comparing convergence of their benthic assemblages to adjace...
Article
Full-text available
Due to severe and ongoing population declines, Acropora palmata received US federally threatened status in 2006. NOAA has since released a protocol for demographic monitoring of this genus in order to assess population status, and to encourage monitoring partnerships throughout the Caribbean (Williams et al 2006). In 2006, NOAA partnered with the S...
Article
Full-text available
Coral reefs and associated ecosystems in the NW region of Cuba are well preserved in general terms, although overfishing of some species is a generalized problem and coastal pollution is present in some places near highly populated areas. Tourism development in coastal areas is low and its present impact is negligible compared to other parts of the...
Article
Full-text available
RESUMEN El área costera utilizada para buceo contemplativo en Cayo Levisa, Archipiélago de Los Colorados, Cuba, está incluida dentro del Sistema Nacional de Áreas Protegidas por los valores naturales que contiene, entre ellos, extensos arrecifes coralinos aun sin estudiar. Los objetivos de este estudio fueron identificar y caracterizar los biotopos...
Article
Full-text available
We estimated 673 km 2 of potential habitat for Acropora palmata in Puerto Rico using GIS and measured the distribution, abundance and condition with a random sampling approach at six sites (3 east and 3 west coast MPAs). Average density ranged from 0.2 to 9.8 colonies/100m 2 and was highest on west coast sites (Rincón and Cabo Rojo) and these sites...
Article
Full-text available
RESUMEN Se realiza un estudio de las variaciones en espacio y tiempo del cubrimiento por algas en el arrecife al este de la desembocadura del río Canasí entre febrero y octubre del 2000. Tres estaciones paralelas a la costa, fueron ubicadas a diferente distancia del río y en la cresta del arrecife. Las algas se dividen en tres grupos funcionales (m...
Article
Full-text available
RESUMEN La caracterización del bentos de los arrecifes coralinos de Cayo Levisa, región noroccidental de Cuba se efectuó en octubre del 2002 y octubre del 2003. Se seleccionaron estaciones de muestreo en 4 biotopos (entre 2 y 25m de profundidad). Los morfotipos de algas foliosas y calcáreas fueron dominantes, llegaron a cubrir hasta el 60% del sust...

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