Allan O'Connell, Jr., Ph.D. (Former Employee)
Science and Products
Filter Total Items: 57
A spatial mark–resight model augmented with telemetry data
Abundance and population density are fundamental pieces of information for population ecology and species conservation, but they are difficult to estimate for rare and elusive species. Mark-resight models are popular for estimating population abundance because they are less invasive and expensive than traditional mark-recapture. However, density estimation using mark-resight is difficult because t
Authors
Rachel Sollmann, Beth Gardner, Arielle W. Parsons, Jessica J. Stocking, Brett T. McClintock, Theodore R. Simons, Kenneth H. Pollock, Allan F. O’Connell
Comparison of five modelling techniques to predict the spatial distribution and abundance of seabirds
Knowledge about the spatial distribution of seabirds at sea is important for conservation. During marine conservation planning, logistical constraints preclude seabird surveys covering the complete area of interest and spatial distribution of seabirds is frequently inferred from predictive statistical models. Increasingly complex models are available to relate the distribution and abundance of p
Authors
Allan F. O'Connell, Beth Gardner, Steffen Oppel, Ana Meirinho, Iván Ramírez, Peter I. Miller, Maite Louzao
Variation in wind and piscivorous predator fields affecting the survival of Atlantic salmon, Salmo salar, in the Gulf of Maine
Observations relevant to the North American stock complex of Atlantic salmon, Salmo salar L., suggest that marine mortality is influenced by variation in predation pressure affecting post‐smolts during the first months at sea. This hypothesis was tested for Gulf of Maine (GOM) stocks by examining wind pseudostress and the distribution of piscivorous predator fields potentially affecting post‐smolt
Authors
K.D. Friedland, J.P. Manning, Jason S. Link, J.R. Gilbert, A.T. Gilbert, A.F. O'Connell
Demographics, diet, movements, and survival of an isolated, unmanaged raccoon Procyon lotor (Procyonidae, Carnivora) population on the Outer Banks of North Carolina
Raccoons (Procyon lotor) are highly adaptable meso-carnivores that inhabit many environments, including the Atlantic barrier islands, where their role as predators of declining, beach-nesting bird and turtle species is of particular interest. Population models that improve our understanding of predator-prey dynamics are receiving increasing attention in the literature; however, their effective app
Authors
Arielle Waldstein Parsons, Theodore R. Simons, Allan F. O'Connell, Michael K. Stoskopf
Statistical analyses to support guidelines for marine avian sampling. Final report
Interest in development of offshore renewable energy facilities has led to a need for high-quality, statistically robust information on marine wildlife distributions. A practical approach is described to estimate the amount of sampling effort required to have sufficient statistical power to identify species-specific “hotspots” and “coldspots” of marine bird abundance and occurrence in an offshore
Authors
Brian P. Kinlan, Elise Zipkin, Allan F. O'Connell, Chris Caldow
Camera traps in animal ecology and conservation: What's next?
No abstract available.
Authors
James D. Nichols, Allan F. O'Connell, K. Ullas Karanth
Hierarchical spatial capture-recapture models for estimating density from trapping arrays
No abstract available.
Authors
J. Andrew Royle, B. Gardner
Estimation of demographic parameters in a tiger population from long-term camera trap data
Chapter 7 (Karanth et al.) illustrated the use of camera trapping in combination with closed population capture–recapture (CR) models to estimate densities of tigers Panthera tigris. Such estimates can be very useful for investigating variation across space for a particular species (e.g., Karanth et al. 2004) or variation among species at a specific location. In addition, estimates of density cont
Authors
K. Ullas Karanth, James D. Nichols
Science, conservation, and camera traps
Biologists commonly perceive camera traps as a new tool that enables them to enter the hitherto secret world of wild animals. Camera traps are being used in a wide range of studies dealing with animal ecology, behavior, and conservation. Our intention in this volume is not to simply present the various uses of camera traps, but to focus on their use in the conduct of science and conservation. In t
Authors
James D. Nichols, K. Ullas Karanth, Allan F. O'Connel
Estimating tiger abundance from camera trap data: Field surveys and analytical issues
Automated photography of tigers Panthera tigris for purely illustrative purposes was pioneered by British forester Fred Champion (1927, 1933) in India in the early part of the Twentieth Century. However, it was McDougal (1977) in Nepal who first used camera traps, equipped with single-lens reflex cameras activated by pressure pads, to identify individual tigers and study their social and predatory
Authors
K. Ullas Karanth, James D. Nichols
Inference for occupancy and occupancy dynamics
This chapter deals with the estimation of occupancy as a state variable to assess the status of, and track changes in, species distributions when sampling with camera traps. Much of the recent interest in occupancy estimation and modeling originated from the models developed by MacKenzie et al. (2002, 2003), although similar methods were developed independently (Azuma et al. 1990; Bayley and Peter
Authors
Allan F. O'Connell, Larissa L. Bailey
Distribution patterns of wintering sea ducks in relation to the North Atlantic Oscillation and local environmental characteristics
Twelve species of North American sea ducks (Tribe Mergini) winter off the eastern coast of the United States and Canada. Yet, despite their seasonal proximity to urbanized areas in this region, there is limited information on patterns of wintering sea duck habitat use. It is difficult to gather information on sea ducks because of the relative inaccessibility of their offshore locations, their high
Authors
Elise F. Zipkin, Beth Gardner, Andrew T. Gilbert, Allan F. O'Connell, J. Andrew Royle, Emily D. Silverman
Science and Products
Filter Total Items: 57
A spatial mark–resight model augmented with telemetry data
Abundance and population density are fundamental pieces of information for population ecology and species conservation, but they are difficult to estimate for rare and elusive species. Mark-resight models are popular for estimating population abundance because they are less invasive and expensive than traditional mark-recapture. However, density estimation using mark-resight is difficult because t
Authors
Rachel Sollmann, Beth Gardner, Arielle W. Parsons, Jessica J. Stocking, Brett T. McClintock, Theodore R. Simons, Kenneth H. Pollock, Allan F. O’Connell
Comparison of five modelling techniques to predict the spatial distribution and abundance of seabirds
Knowledge about the spatial distribution of seabirds at sea is important for conservation. During marine conservation planning, logistical constraints preclude seabird surveys covering the complete area of interest and spatial distribution of seabirds is frequently inferred from predictive statistical models. Increasingly complex models are available to relate the distribution and abundance of p
Authors
Allan F. O'Connell, Beth Gardner, Steffen Oppel, Ana Meirinho, Iván Ramírez, Peter I. Miller, Maite Louzao
Variation in wind and piscivorous predator fields affecting the survival of Atlantic salmon, Salmo salar, in the Gulf of Maine
Observations relevant to the North American stock complex of Atlantic salmon, Salmo salar L., suggest that marine mortality is influenced by variation in predation pressure affecting post‐smolts during the first months at sea. This hypothesis was tested for Gulf of Maine (GOM) stocks by examining wind pseudostress and the distribution of piscivorous predator fields potentially affecting post‐smolt
Authors
K.D. Friedland, J.P. Manning, Jason S. Link, J.R. Gilbert, A.T. Gilbert, A.F. O'Connell
Demographics, diet, movements, and survival of an isolated, unmanaged raccoon Procyon lotor (Procyonidae, Carnivora) population on the Outer Banks of North Carolina
Raccoons (Procyon lotor) are highly adaptable meso-carnivores that inhabit many environments, including the Atlantic barrier islands, where their role as predators of declining, beach-nesting bird and turtle species is of particular interest. Population models that improve our understanding of predator-prey dynamics are receiving increasing attention in the literature; however, their effective app
Authors
Arielle Waldstein Parsons, Theodore R. Simons, Allan F. O'Connell, Michael K. Stoskopf
Statistical analyses to support guidelines for marine avian sampling. Final report
Interest in development of offshore renewable energy facilities has led to a need for high-quality, statistically robust information on marine wildlife distributions. A practical approach is described to estimate the amount of sampling effort required to have sufficient statistical power to identify species-specific “hotspots” and “coldspots” of marine bird abundance and occurrence in an offshore
Authors
Brian P. Kinlan, Elise Zipkin, Allan F. O'Connell, Chris Caldow
Camera traps in animal ecology and conservation: What's next?
No abstract available.
Authors
James D. Nichols, Allan F. O'Connell, K. Ullas Karanth
Hierarchical spatial capture-recapture models for estimating density from trapping arrays
No abstract available.
Authors
J. Andrew Royle, B. Gardner
Estimation of demographic parameters in a tiger population from long-term camera trap data
Chapter 7 (Karanth et al.) illustrated the use of camera trapping in combination with closed population capture–recapture (CR) models to estimate densities of tigers Panthera tigris. Such estimates can be very useful for investigating variation across space for a particular species (e.g., Karanth et al. 2004) or variation among species at a specific location. In addition, estimates of density cont
Authors
K. Ullas Karanth, James D. Nichols
Science, conservation, and camera traps
Biologists commonly perceive camera traps as a new tool that enables them to enter the hitherto secret world of wild animals. Camera traps are being used in a wide range of studies dealing with animal ecology, behavior, and conservation. Our intention in this volume is not to simply present the various uses of camera traps, but to focus on their use in the conduct of science and conservation. In t
Authors
James D. Nichols, K. Ullas Karanth, Allan F. O'Connel
Estimating tiger abundance from camera trap data: Field surveys and analytical issues
Automated photography of tigers Panthera tigris for purely illustrative purposes was pioneered by British forester Fred Champion (1927, 1933) in India in the early part of the Twentieth Century. However, it was McDougal (1977) in Nepal who first used camera traps, equipped with single-lens reflex cameras activated by pressure pads, to identify individual tigers and study their social and predatory
Authors
K. Ullas Karanth, James D. Nichols
Inference for occupancy and occupancy dynamics
This chapter deals with the estimation of occupancy as a state variable to assess the status of, and track changes in, species distributions when sampling with camera traps. Much of the recent interest in occupancy estimation and modeling originated from the models developed by MacKenzie et al. (2002, 2003), although similar methods were developed independently (Azuma et al. 1990; Bayley and Peter
Authors
Allan F. O'Connell, Larissa L. Bailey
Distribution patterns of wintering sea ducks in relation to the North Atlantic Oscillation and local environmental characteristics
Twelve species of North American sea ducks (Tribe Mergini) winter off the eastern coast of the United States and Canada. Yet, despite their seasonal proximity to urbanized areas in this region, there is limited information on patterns of wintering sea duck habitat use. It is difficult to gather information on sea ducks because of the relative inaccessibility of their offshore locations, their high
Authors
Elise F. Zipkin, Beth Gardner, Andrew T. Gilbert, Allan F. O'Connell, J. Andrew Royle, Emily D. Silverman