Leo Polansky
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View article: Stopping Rule Sampling to Monitor and Protect Endangered Species
Stopping Rule Sampling to Monitor and Protect Endangered Species Open
Ecological science and management often require animal population abundance estimates to determine population status, set harvest limits on exploited populations, assess biodiversity, and evaluate the effects of management actions. However…
View article: Identifying minimum freshwater habitat conditions for an endangered fish using life cycle analysis
Identifying minimum freshwater habitat conditions for an endangered fish using life cycle analysis Open
Identifying the most important factors affecting population growth in animal life cycles is an important tool of species conservation. Delta Smelt ( Hypomesus transpacificus ), an annual fish endemic to the San Francisco Estuary in Califor…
View article: Transitional Strategies of Juvenile Green Sturgeon from a Riverine to a Brackish Water Environment
Transitional Strategies of Juvenile Green Sturgeon from a Riverine to a Brackish Water Environment Open
Information on habitat transitions is critical to understand whether efforts to manage the freshwater phase of juvenile green sturgeon (Acipenser medirostris) rearing habitats are feasible or beneficial. We implanted microacoustic transmit…
View article: Combining multiple data sources with different biases in state‐space models for population dynamics
Combining multiple data sources with different biases in state‐space models for population dynamics Open
The resolution at which animal populations can be modeled can be increased when multiple datasets corresponding to different life stages are available, allowing, for example, seasonal instead of annual descriptions of dynamics. However, th…
View article: Disentangling risks to an endangered fish: using a state-space life cycle model to separate natural mortality from anthropogenic losses
Disentangling risks to an endangered fish: using a state-space life cycle model to separate natural mortality from anthropogenic losses Open
State-space population models are becoming a common tool to guide natural resource management, because they address the statistical challenges arising from high observation error and process variation while improving inference by integrati…
View article: Improving inference for nonlinear state‐space models of animal population dynamics given biased sequential life stage data
Improving inference for nonlinear state‐space models of animal population dynamics given biased sequential life stage data Open
State‐space models (SSMs) are a popular tool for modeling animal abundances. Inference difficulties for simple linear SSMs are well known, particularly in relation to simultaneous estimation of process and observation variances. Several re…
View article: Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire
Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire Open
Meat, long hypothesized as an important food source in human evolution, is still a substantial component of the modern human diet, with some humans relying entirely on meat during certain times of the year. Understanding the socio-ecologic…
View article: Peer Review #1 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.1)"
Peer Review #1 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.1)" Open
Meat, long hypothesized as an important food source in human evolution, is still a substantial component of the modern human diet, with some humans relying entirely on meat during certain times of the year.Understanding the socio-ecologica…
View article: Peer Review #2 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.1)"
Peer Review #2 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.1)" Open
Meat, long hypothesized as an important food source in human evolution, is still a substantial component of the modern human diet, with some humans relying entirely on meat during certain times of the year.Understanding the socio-ecologica…
View article: Peer Review #1 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.2)"
Peer Review #1 of "Social rank overrides environmental and community fluctuations in determining meat access by female chimpanzees in the Taï National Park, Côte d’Ivoire (v0.2)" Open
Meat, long hypothesized as an important food source in human evolution, is still a substantial component of the modern human diet, with some humans relying entirely on meat during certain times of the year.Understanding the socio-ecologica…
View article: Improving inference for nonlinear state-space models of animal\n population dynamics given biased sequential life stage data
Improving inference for nonlinear state-space models of animal\n population dynamics given biased sequential life stage data Open
State-space models (SSMs) are a popular tool for modeling animal abundances.\nInference difficulties for simple linear SSMs are well known, particularly in\nrelation to simultaneous estimation of process and observation variances.\nSeveral…
View article: Annual cycles are the most common reproductive strategy in African tropical tree communities
Annual cycles are the most common reproductive strategy in African tropical tree communities Open
We present the first cross‐continental comparison of the flowering and fruiting phenology of tropical forests across Africa. Flowering events of 5446 trees from 196 species across 12 sites and fruiting events of 4595 trees from 191 species…
View article: Appendix A. Further discussion on the theta-Ricker and generalized Beverton-Holt density-dependent models, a complete description of likelihood equations and methods of parameter estimation, elaboration on the simulation experiment, additional analyses of the Accipiter nisus data set, TRPN best-fit and ALT models for 25 additional time series from the GPDD, and a presentation of the joint profile likelihood surface of a Columba oenas data set for comparison with Bayesian posterior densities.
Appendix A. Further discussion on the theta-Ricker and generalized Beverton-Holt density-dependent models, a complete description of likelihood equations and methods of parameter estimation, elaboration on the simulation experiment, additional analyses of the Accipiter nisus data set, TRPN best-fit and ALT models for 25 additional time series from the GPDD, and a presentation of the joint profile likelihood surface of a Columba oenas data set for comparison with Bayesian posterior densities. Open
Further discussion on the theta-Ricker and generalized Beverton-Holt density-dependent models, a complete description of likelihood equations and methods of parameter estimation, elaboration on the simulation experiment, additional analyse…
View article: Appendix A. Details on the Fourier and wavelet methods, additional details on the method of simulation, more extensive simulation studies to evaluate issues of sampling interval size and to show that the results presented in Fig. 4 of the main text are not an artifact of the particular movement trajectory used, additional analyses and results of the lion and buffalo data, and a table summarizing the parameters used in the implementation of the frequency and time–frequency methods for each...
Appendix A. Details on the Fourier and wavelet methods, additional details on the method of simulation, more extensive simulation studies to evaluate issues of sampling interval size and to show that the results presented in Fig. 4 of the main text are not an artifact of the particular movement trajectory used, additional analyses and results of the lion and buffalo data, and a table summarizing the parameters used in the implementation of the frequency and time–frequency methods for each... Open
Details on the Fourier and wavelet methods, additional details on the method of simulation, more extensive simulation studies to evaluate issues of sampling interval size and to show that the results presented in Fig. 4 of the main text ar…
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View article: Elucidating the significance of spatial memory on movement decisions by African savannah elephants using state–space models
Elucidating the significance of spatial memory on movement decisions by African savannah elephants using state–space models Open
Spatial memory facilitates resource acquisition where resources are patchy, but how it influences movement behaviour of wide-ranging species remains to be resolved. We examined African elephant spatial memory reflected in movement decision…