J. Andrew Royle
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View article: Evidence for Recruitment-Mediated Decline in an Eastern Box Turtle (Terrapene carolina carolina) Population Based on a 30-Year Capture–Recapture Data Set from Maryland
Evidence for Recruitment-Mediated Decline in an Eastern Box Turtle (Terrapene carolina carolina) Population Based on a 30-Year Capture–Recapture Data Set from Maryland Open
View article: Abundance‐mediated species interactions
Abundance‐mediated species interactions Open
Species interactions shape biodiversity patterns, community assemblage, and the dynamics of wildlife populations. Ecological theory posits that the strength of interspecific interactions is fundamentally underpinned by the population sizes…
View article: Comparison of classical and drone based hard-target methodologies applied to scanning lidar for offshore wind
Comparison of classical and drone based hard-target methodologies applied to scanning lidar for offshore wind Open
Hard target testing is a crucial part of the commissioning process of scanning lidar measurement systems. The correct alignment of the scan head and understanding of the pointing accuracy is crucial to reducing uncertainties in wind speed …
View article: Estimating Species-specific U.S. Waterfowl Harvest
Estimating Species-specific U.S. Waterfowl Harvest Open
The U.S. Fish and Wildlife Service monitors species-specific waterfowl (ducks, seaducks, geese, and brant) harvest through two hunter surveys, one that estimates the total harvest for each waterfowl group, and a second that estimates the s…
View article: Integrated distance sampling models for simple point counts
Integrated distance sampling models for simple point counts Open
Point counts (PCs) are widely used in biodiversity surveys but, despite numerous advantages, simple PCs suffer from several problems: detectability, and therefore abundance, is unknown; systematic spatiotemporal variation in detectability …
View article: Spatially explicit dynamic N-mixture models with interspecific interactions
Spatially explicit dynamic N-mixture models with interspecific interactions Open
Interspecific interactions and movement are key factors that drive the coexistence of metapopulations in heterogenous landscapes. Yet, it is challenging to understand these factors because separating movement from local population processe…
View article: Experimental evaluation of Eastern box turtle (<i>Terrapene carolina carolina</i>) detectability in visual search surveys
Experimental evaluation of Eastern box turtle (<i>Terrapene carolina carolina</i>) detectability in visual search surveys Open
Understanding how detection probability varies over time, space, or in response to measurable covariates is important to inform the monitoring and assessment of many species. A standard model to understand detectability – the availability/…
View article: Long-term trends of local bird populations based on monitoring schemes: are they suitable for justifying management measures?
Long-term trends of local bird populations based on monitoring schemes: are they suitable for justifying management measures? Open
Local biodiversity monitoring is important to assess the effects of global change, but also to evaluate the performance of landscape and wildlife protection, since large-scale assessments may buffer local fluctuations, rare species tend to…
View article: The unmarked R package: Twelve years of advances in occurrence and abundance modelling in ecology
The unmarked R package: Twelve years of advances in occurrence and abundance modelling in ecology Open
Species distribution models (SDMs) are widely applied to understand the processes governing spatial and temporal variation in species abundance and distribution but often do not account for measurement errors such as false negatives and fa…
View article: Towards estimating marine wildlife abundance using aerial surveys and deep learning with hierarchical classifications subject to error
Towards estimating marine wildlife abundance using aerial surveys and deep learning with hierarchical classifications subject to error Open
Aerial count surveys of wildlife populations are a prominent monitoring method for many wildlife species. Traditionally, these surveys utilize human observers to detect, count, and classify observations to species. However, given recent te…
View article: Long-term trends of local bird populations based on monitoring schemes: are they suitable for justifying management measures?
Long-term trends of local bird populations based on monitoring schemes: are they suitable for justifying management measures? Open
R workspace files containing list-type objects with the count data of the birds species analysed in unmarked format for each study site, La Muela and Carrascoy, respectively. Count data are composed the point sites in each study are…
View article: Density‐habitat relationships of white‐tailed deer (<i>Odocoileus virginianus</i>) in Finland
Density‐habitat relationships of white‐tailed deer (<i>Odocoileus virginianus</i>) in Finland Open
In heterogeneous landscapes, resource selection constitutes a crucial link between landscape and population‐level processes such as density. We conducted a non‐invasive genetic study of white‐tailed deer in southern Finland in 2016 and 201…
View article: Sharing land via keystone structure: Retaining naturally regenerated trees may efficiently benefit birds in plantations
Sharing land via keystone structure: Retaining naturally regenerated trees may efficiently benefit birds in plantations Open
Meeting food/wood demands with increasing human population and per‐capita consumption is a pressing conservation issue, and is often framed as a choice between land sparing and land sharing. Although most empirical studies comparing the ef…
View article: Integrated distance sampling models for simple point counts
Integrated distance sampling models for simple point counts Open
Point counts (PCs) are widely used in biodiversity surveys, but despite numerous advantages, simple PCs suffer from several problems: detectability, and therefore abundance, is unknown; systematic spatiotemporal variation in detectability …
View article: Know what you don't know: Embracing state uncertainty in disease‐structured multistate models
Know what you don't know: Embracing state uncertainty in disease‐structured multistate models Open
Hidden Markov models (HMMs) are broadly applicable hierarchical models that derive their utility from separating state processes from observation processes yielding the data. Multistate models such as mark–recapture and dynamic multistate …
View article: Modeling spatiotemporal abundance and movement dynamics using an integrated spatial capture–recapture movement model
Modeling spatiotemporal abundance and movement dynamics using an integrated spatial capture–recapture movement model Open
Animal movement is a fundamental ecological process affecting the survival and reproduction of individuals, the structure of populations, and the dynamics of communities. Methods to quantify animal movement and spatiotemporal abundances, h…
View article: Estimating species misclassification with occupancy dynamics and encounter rates: A semi‐supervised, individual‐level approach
Estimating species misclassification with occupancy dynamics and encounter rates: A semi‐supervised, individual‐level approach Open
Large‐scale, long‐term biodiversity monitoring is essential to conservation, land management and identifying threats to biodiversity. However, multispecies surveys are prone to various types of observation error, including false‐positive/f…
View article: Quantifying the relationship between prey density, livestock and illegal killing of leopards
Quantifying the relationship between prey density, livestock and illegal killing of leopards Open
Many large mammalian carnivores are facing population declines due to illegal killing (e.g. shooting) and habitat modification (e.g. livestock farming). Illegal killing occurs cryptically and hence is difficult to detect. However, reducing…
View article: Extreme uncertainty and unquantifiable bias do not inform population sizes
Extreme uncertainty and unquantifiable bias do not inform population sizes Open
View article: Estimating occupancy dynamics and encounter rates with species misclassification: a semi-supervised individual-level approach
Estimating occupancy dynamics and encounter rates with species misclassification: a semi-supervised individual-level approach Open
Large-scale, long-term biodiversity monitoring is essential to meeting conservation and land management goals and identifying threats to biodiversity. However, multispecies surveys are prone to various types of observation error, including…
View article: Spatial capture–recapture with random thinning for unidentified encounters
Spatial capture–recapture with random thinning for unidentified encounters Open
Spatial capture–recapture (SCR) models have increasingly been used as a basis for combining capture–recapture data types with variable levels of individual identity information to estimate population density and other demographic parameter…
View article: Optimal sampling design for spatial capture–recapture
Optimal sampling design for spatial capture–recapture Open
Spatial capture–recapture (SCR) has emerged as the industry standard for estimating population density by leveraging information from spatial locations of repeat encounters of individuals. The precision of density estimates depends fundame…
View article: Estimating and forecasting spatial population dynamics of apex predators using transnational genetic monitoring
Estimating and forecasting spatial population dynamics of apex predators using transnational genetic monitoring Open
Significance We are experiencing the accelerated loss and reconfiguration of biological diversity. Meanwhile, those charged with natural resource management are struggling to meet the challenges of monitoring and managing wildlife populati…
View article: Spatial proximity moderates genotype uncertainty in genetic tagging studies
Spatial proximity moderates genotype uncertainty in genetic tagging studies Open
Significance We present a statistical framework for the estimation of animal demographic parameters, such as abundance, density, and growth rate, from noninvasive genetic samples (e.g., hair, scat). By integrating a genetic classification …
View article: Migratory behavior and winter geography drive differential range shifts of eastern birds in response to recent climate change
Migratory behavior and winter geography drive differential range shifts of eastern birds in response to recent climate change Open
Significance Over the past half century, populations of neotropical migratory birds in North America have plummeted while populations of resident species have largely remained stable. We show that resident and migratory birds in eastern No…
View article: Optimal sampling design for spatial capture-recapture
Optimal sampling design for spatial capture-recapture Open
Spatial capture-recapture (SCR) has emerged as the industry standard for estimating population density by leveraging information from spatial locations of repeat encounters of individuals. The precision of density estimates depends fundame…
View article: Movement-assisted localization from acoustic telemetry data
Movement-assisted localization from acoustic telemetry data Open
View article: Consequences of ignoring group association in spatial capture–recapture analysis
Consequences of ignoring group association in spatial capture–recapture analysis Open
Many models in population ecology, including spatial capture–recapture (SCR) models, assume that individuals are distributed and detected independently of one another. In reality, this is rarely the case – both antagonistic and gregarious …
View article: Acoustic space occupancy: Combining ecoacoustics and lidar to model biodiversity variation and detection bias across heterogeneous landscapes
Acoustic space occupancy: Combining ecoacoustics and lidar to model biodiversity variation and detection bias across heterogeneous landscapes Open
There is global interest in quantifying changing biodiversity in human-modified landscapes. Ecoacoustics may offer a promising pathway for supporting multi-taxa monitoring, but its scalability has been hampered by the sonic complexity of b…
View article: Spatial Proximity Moderates Genotype Uncertainty in Genetic Tagging Studies
Spatial Proximity Moderates Genotype Uncertainty in Genetic Tagging Studies Open
Accelerating declines of an increasing number of animal populations worldwide necessitate methods to reliably and efficiently estimate demographic parameters such as population density and trajectory. Standard methods for estimating demogr…