Jaime Collazo, PhD
Assistant Unit Leader - North Carolina Cooperative Fish and Wildlife Research Unit
Research Interests
- Demographic Processes and Conservation
- Species-habitat relationships
- Endangered Species Conservation
Teaching Interests
- Hierarchical Species-Habitat Modeling
- Tropical Avian Biology
Professional Experience
Assistant Unit Leader, North Carolina Cooperative Fish and Wildlife Research Unit, 1991-
Education and Certifications
PhD-Iowa State University
MS-University of Idaho
BS-Universtity of Puerto Rico
Science and Products
Filter Total Items: 50
Influence of habitat structure and prey abundance on cccupancy and abundance of two anole ecomorphs, Anolis cristatellus and Anolis krugi, in secondary karst forests in northern Puerto Rico
Ecological studies strive to identify factors that explain patterns of species distribution and abundance. In lizards, competition and predation are major forces influencing distribution and abundance, but there is also increasing evidence pointing at the influence of habitat structure and prey abundance. Our work explored the latter further by quantifying the effects of vegetation and prey abunda
Authors
S. J. Vega-Castillo, Jaime A. Collazo, A. R. Puente-Rolón, E. Cuevas
Factors that influence participation of Puerto Rican coffee farmers in conservation programs
Sustainable, conservation-oriented agricultural practices like shade coffee and agroforestry can enhance conservation objectives in tropical landscapes. Adoption of these practices, however, is influenced by numerous factors. We conducted a survey of 89 coffee farmers in Puerto Rico to understand their farming practices, experience with existing incentives, and willingness to participate in conser
Authors
Tatiana M. Gladkikh, Jaime A. Collazo, Alejandro Torres-Abreu, Angelica M. Reyes, Marysol Molina
Population estimates of Antillean manatees in Puerto Rico: An analytical framework for aerial surveys using multi-pass removal sampling
Effective management of the threatened Antillean manatee (Trichechus manatus manatus) in Puerto Rico requires reliable estimates of population size. Estimates are needed to assess population responses to management actions, and whether recovery objectives have been met. Aerial surveys have been conducted since 1976, but none adjusted for imperfect detection. We summarize surveys since 1976, report
Authors
Jaime A. Collazo, M.J. Krachey, K.H. Pollock, F.J. Pérez-Aguilo, J.P. Zegarra, A.A. Mignucci-Giannoni
A comparison of coffee floral traits under two different agricultural practices
Floral traits and rewards are important in mediating interactions between plants and pollinators. Agricultural management practices can affect abiotic factors known to influence floral traits; however, our understanding of the links between agricultural practices and floral trait expression is still poorly understood. Variation in floral morphological, nectar, and pollen traits of two important ag
Authors
S.G. Prado, Jaime A. Collazo, P.C. Stevenson, R.E. Irwin
Partitioning global change: Assessing the relative importance of changes in climate and land cover for changes in avian distribution
Understanding the relative impact of climate change and land cover change on changes in avian distribution has implications for the future course of avian distributions and appropriate management strategies. Due to the dynamic nature of climate change, our goal was to investigate the processes that shape species distributions, rather than the current distributional patterns. To this end, we analyz
Authors
Matthew J. Clement, James D. Nichols, Jaime A. Collazo, Adam Terando, James E. Hines, Steven G. Williams
Persistence-based area prioritization for conservation: Applying occupancy and habitat threats and risks analyses
Effective habitat conservation is predicated on maintaining high levels or increasing local persistence probability of the species it purports to protect. Thus, methodological approaches that improve the inferential value of local persistence are of utmost value to guide conservation planning as they inform area selection processes. Herein we used the painted bunting Passerina ciris, a species of
Authors
L. M. Yirka, Jaime A. Collazo, S. G. Williams, D. T. Cobb
Toward a resilience-based conservation strategy for wetlands in Puerto Rico: Meeting challenges posed by environmental change
Designing conservation strategies in human-dominated landscapes is challenging, owing to complex human-natural systems and evolving societal values. To meet this challenge, a robust, adaptive strategy should have a process for flexible implementation of incremental actions. We describe a hypothetical example for the Rio Grande de Arecibo watershed and coastal wetlands in Puerto Rico to address the
Authors
Jaime A. Collazo, Adam J. Terando, Augustin C. Engman, P. F. Fackler, Thomas J. Kwak
Improving our understanding of demographic monitoring: avian breeding productivity in a tropical dry forest
The ratio of juvenile to adult birds in mist-net samples is used to monitor avian productivity, but whether it is a “true” estimate of per capita productivity or an index proportional to productivity depends on whether capture probability is not age-dependent (true estimate) or age difference in capture probability is consistent among years (index). Better understanding of the processes affecting
Authors
M. E. Kornegay, A. N. M. Wiewel, Jaime A. Collazo, J. F. Saracco, S. J. Dinsmore
Resurgence of specialized shade coffee cultivation: Effects on pollination services and quality of coffee production
Since the early 2000s, there has been a resurgence in shade coffee production on the island of Puerto Rico. The newly restored specialized shade canopy consists of four native tree species, three of which are nitrogen fixers, and is intended to provide 30% shade cover once the trees are matured. Though much is known about the benefits of rustic and traditional shade plantations to coffee productio
Authors
Sara Guiti Prado, Jaime A. Collazo, R. E. Irwin
Optimal treatment allocations in space and time for online control of anemerging infectious disease
A key component in controlling the spread of an epidemic is deciding where, when and to whom to apply an intervention. We develop a framework for using data to inform these decisions in realtime. We formalize a treatment allocation strategy as a sequence of functions, one per treatment period, that map up‐to‐date information on the spread of an infectious disease to a subset of locations where tre
Authors
Eric B. Laber, Nick J. Meyer, Brian J. Reich, Krishna Pacifici, Jaime A. Collazo, John M. Drake
Avian response to shade‐layer restoration in coffee plantations in Puerto Rico
Documenting the evolving processes associated with habitat restoration and how long it takes to detect avian demographic responses is crucial to evaluate the success of restoration initiatives and to identify ways to improve their effectiveness. The importance of this endeavor prompted the U.S. Fish and Wildlife Service and the USDA Natural Resources Conservation Service to evaluate their sun‐to‐s
Authors
Amarilys D. Irizarry, Jaime A. Collazo, Krishna Pacifici, Brian J. Reich, Kathryn E. Battle
Demographic rates of two southeastern populations of Painted Bunting, 2007–2015
Painted Buntings (Passerina ciris) have been declining in the southeastern United States since the 1970s. A recent demographic assessment highlighted the importance of estimating demographic parameters, which have received little attention to date. The dearth of information is troublesome because attempts to reverse declining trends require a better understanding of the relationship between habita
Authors
Liani M. Yirka, Jaime A. Collazo, Brian J. O'Shea, J.A. Gerwin, James A. Rotenberg, David T. Cobb
Science and Products
Filter Total Items: 50
Influence of habitat structure and prey abundance on cccupancy and abundance of two anole ecomorphs, Anolis cristatellus and Anolis krugi, in secondary karst forests in northern Puerto Rico
Ecological studies strive to identify factors that explain patterns of species distribution and abundance. In lizards, competition and predation are major forces influencing distribution and abundance, but there is also increasing evidence pointing at the influence of habitat structure and prey abundance. Our work explored the latter further by quantifying the effects of vegetation and prey abunda
Authors
S. J. Vega-Castillo, Jaime A. Collazo, A. R. Puente-Rolón, E. Cuevas
Factors that influence participation of Puerto Rican coffee farmers in conservation programs
Sustainable, conservation-oriented agricultural practices like shade coffee and agroforestry can enhance conservation objectives in tropical landscapes. Adoption of these practices, however, is influenced by numerous factors. We conducted a survey of 89 coffee farmers in Puerto Rico to understand their farming practices, experience with existing incentives, and willingness to participate in conser
Authors
Tatiana M. Gladkikh, Jaime A. Collazo, Alejandro Torres-Abreu, Angelica M. Reyes, Marysol Molina
Population estimates of Antillean manatees in Puerto Rico: An analytical framework for aerial surveys using multi-pass removal sampling
Effective management of the threatened Antillean manatee (Trichechus manatus manatus) in Puerto Rico requires reliable estimates of population size. Estimates are needed to assess population responses to management actions, and whether recovery objectives have been met. Aerial surveys have been conducted since 1976, but none adjusted for imperfect detection. We summarize surveys since 1976, report
Authors
Jaime A. Collazo, M.J. Krachey, K.H. Pollock, F.J. Pérez-Aguilo, J.P. Zegarra, A.A. Mignucci-Giannoni
A comparison of coffee floral traits under two different agricultural practices
Floral traits and rewards are important in mediating interactions between plants and pollinators. Agricultural management practices can affect abiotic factors known to influence floral traits; however, our understanding of the links between agricultural practices and floral trait expression is still poorly understood. Variation in floral morphological, nectar, and pollen traits of two important ag
Authors
S.G. Prado, Jaime A. Collazo, P.C. Stevenson, R.E. Irwin
Partitioning global change: Assessing the relative importance of changes in climate and land cover for changes in avian distribution
Understanding the relative impact of climate change and land cover change on changes in avian distribution has implications for the future course of avian distributions and appropriate management strategies. Due to the dynamic nature of climate change, our goal was to investigate the processes that shape species distributions, rather than the current distributional patterns. To this end, we analyz
Authors
Matthew J. Clement, James D. Nichols, Jaime A. Collazo, Adam Terando, James E. Hines, Steven G. Williams
Persistence-based area prioritization for conservation: Applying occupancy and habitat threats and risks analyses
Effective habitat conservation is predicated on maintaining high levels or increasing local persistence probability of the species it purports to protect. Thus, methodological approaches that improve the inferential value of local persistence are of utmost value to guide conservation planning as they inform area selection processes. Herein we used the painted bunting Passerina ciris, a species of
Authors
L. M. Yirka, Jaime A. Collazo, S. G. Williams, D. T. Cobb
Toward a resilience-based conservation strategy for wetlands in Puerto Rico: Meeting challenges posed by environmental change
Designing conservation strategies in human-dominated landscapes is challenging, owing to complex human-natural systems and evolving societal values. To meet this challenge, a robust, adaptive strategy should have a process for flexible implementation of incremental actions. We describe a hypothetical example for the Rio Grande de Arecibo watershed and coastal wetlands in Puerto Rico to address the
Authors
Jaime A. Collazo, Adam J. Terando, Augustin C. Engman, P. F. Fackler, Thomas J. Kwak
Improving our understanding of demographic monitoring: avian breeding productivity in a tropical dry forest
The ratio of juvenile to adult birds in mist-net samples is used to monitor avian productivity, but whether it is a “true” estimate of per capita productivity or an index proportional to productivity depends on whether capture probability is not age-dependent (true estimate) or age difference in capture probability is consistent among years (index). Better understanding of the processes affecting
Authors
M. E. Kornegay, A. N. M. Wiewel, Jaime A. Collazo, J. F. Saracco, S. J. Dinsmore
Resurgence of specialized shade coffee cultivation: Effects on pollination services and quality of coffee production
Since the early 2000s, there has been a resurgence in shade coffee production on the island of Puerto Rico. The newly restored specialized shade canopy consists of four native tree species, three of which are nitrogen fixers, and is intended to provide 30% shade cover once the trees are matured. Though much is known about the benefits of rustic and traditional shade plantations to coffee productio
Authors
Sara Guiti Prado, Jaime A. Collazo, R. E. Irwin
Optimal treatment allocations in space and time for online control of anemerging infectious disease
A key component in controlling the spread of an epidemic is deciding where, when and to whom to apply an intervention. We develop a framework for using data to inform these decisions in realtime. We formalize a treatment allocation strategy as a sequence of functions, one per treatment period, that map up‐to‐date information on the spread of an infectious disease to a subset of locations where tre
Authors
Eric B. Laber, Nick J. Meyer, Brian J. Reich, Krishna Pacifici, Jaime A. Collazo, John M. Drake
Avian response to shade‐layer restoration in coffee plantations in Puerto Rico
Documenting the evolving processes associated with habitat restoration and how long it takes to detect avian demographic responses is crucial to evaluate the success of restoration initiatives and to identify ways to improve their effectiveness. The importance of this endeavor prompted the U.S. Fish and Wildlife Service and the USDA Natural Resources Conservation Service to evaluate their sun‐to‐s
Authors
Amarilys D. Irizarry, Jaime A. Collazo, Krishna Pacifici, Brian J. Reich, Kathryn E. Battle
Demographic rates of two southeastern populations of Painted Bunting, 2007–2015
Painted Buntings (Passerina ciris) have been declining in the southeastern United States since the 1970s. A recent demographic assessment highlighted the importance of estimating demographic parameters, which have received little attention to date. The dearth of information is troublesome because attempts to reverse declining trends require a better understanding of the relationship between habita
Authors
Liani M. Yirka, Jaime A. Collazo, Brian J. O'Shea, J.A. Gerwin, James A. Rotenberg, David T. Cobb