<scp>moveVis</scp>: Animating movement trajectories in synchronicity with static or temporally dynamic environmental data in <scp>r</scp>

Schwalb-Willmann, Jakob; Remelgado, Ruben; Safi, Kamran; Wegmann, Martin

doi:10.1111/2041-210x.13374

Cited by 19 publications

(15 citation statements)

References 22 publications

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“…The median date of mating (February 25) and parturition (June 1) in our dataset falls within the range suggested in the literature (e.g. Jackson and Ahlborn 1988;McCarthy and Chapron 2003;Schaller 1977). To validate their accuracy, we compared our dates of parturition with dates reported for captive snow leopards in zoos.…”

Section: Discussionsupporting

confidence: 58%

“…Because of the species' elusive behavior and often inaccessible and rugged mountainous habitat, few data have been recorded on snow leopards' breeding and dispersal behavior. Incidental observations of mating calls and marking behavior suggest that the species has a restricted mating season that occurs between December and March (Hemmer 1972;Jackson and Ahlborn 1988;McCarthy and Chapron 2003;Schaller 1977). Cubs are born the following April-August, and are thought to be dependent on their mother for 1-2 years (Fox and Chundawat 2016;Novikov 1956), or at least for their first winter (Hemmer 1972).…”

Section: Introductionmentioning

confidence: 99%

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The timing of breeding and independence for snow leopard females and their cubs

et al. 2020

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Significant knowledge gaps persist on snow leopard demography and reproductive behavior. From a GPS-collared population in Mongolia, we estimated the timing of mating, parturition and independence. Based on three mother–cub pairs, we describe the separation phase of the cub from its mother as it gains independence. Snow leopards mated from January–March and gave birth from April–June. Cubs remained with their mother until their second winter (20–22 months of age) when cubs started showing movements away from their mother for days at a time. This initiation of independence appeared to coincide with their mother mating with the territorial male. Two female cubs remained in their mothers’ territory for several months after initial separation, whereas the male cub quickly dispersed. By comparing the relationship between body size and age of independence across 11 solitary, medium-to-large felid species, it was clear that snow leopards have a delayed timing of separation compared to other species. We suggest this may be related to their mating behavior and the difficulty of the habitat and prey capture for juvenile snow leopards. Our results, while limited, provide empirical estimates for understanding snow leopard ecology and for parameterizing population models.

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Section: Discussionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

The timing of breeding and independence for snow leopard females and their cubs

et al. 2020

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“…Positions were filtered and smoothed using a continuous-time correlated random walk movement model. The visualization was generated with the 'moveVis' package for R [46]. Authors' contributions EA, JA and RA conceived the study.…”

Section: Supplementary Informationmentioning

confidence: 99%

Performance of a novel system for high-resolution tracking of marine fish societies

et al. 2021

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Recent advances in tracking systems have revolutionized our ability to study animal movement in the wild. In aquatic environments, high-resolution acoustic telemetry systems make it technically possible to simultaneously monitor large amounts of individuals at unprecedented spatial and temporal resolutions, providing a unique opportunity to study the behaviour and social interactions using a reality mining approach. Despite the potential, high-resolution telemetry systems have had very limited use in coastal marine areas due to the limitations that these environments pose to the transmission of acoustic signals. This study aims at designing and testing a high-resolution acoustic telemetry system to monitor, for the first time, a natural fish population in an open marine area. First, we conducted preliminary range tests and a computer simulation study to identify the optimal design of the telemetry system. Then, we performed a series of stationary and moving tests to characterize the performance of the system in terms of positioning efficiency and precision. Finally, we obtained a dataset corresponding to the movements of 170 concurrently tagged individuals to demonstrate the overall functioning of the system with a real study case of the behaviour of a small-bodied coastal species. Our results show that high-resolution acoustic telemetry systems efficiently generate positional data in marine systems, providing a precision of few meters, a temporal resolution of few seconds, and the possibility of tracking hundreds of individuals simultaneously. Data post-processing using a trajectory filter and movement models proved to be key to achieve a sub-meter positioning precision. The main limitation detected for our system was the restricted detection range, which was negatively affected by the stratification of the water column. Our work demonstrates that high-resolution acoustic telemetry systems are an effective method to monitor the movements of free-ranging individuals at the population level in coastal sites. By providing highly precise positioning estimates of large amounts of individuals, these systems represent a powerful tool to study key ecological processes regarding the social interactions of individuals, including social dynamics, collective movements, or responses to environmental perturbations, and to extend the studies to poorly studied small-sized species or life-stages.

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“…We analysed data from J = 15 individuals tracked with GPS units from 30 July 2018 to 29 September 2018 (Figure 2; Cheng et al., 2019; Fiedler et al., 2019 data). These data are available in the r package ‘ move V is ’ (Schwalb‐Willmann et al., 2020).…”

Section: Application: White Stork Migrationmentioning

confidence: 99%

“…The R code used in our analyses is available at https://doi.org/10.5281/zenodo.4075393 (McCaslin et al., 2020). The white stork dataset is available on Movebank (Fiedler et al., 2019, https://doi.org/10.5441/001/1.v1cs4nn0) and in the r package ‘ move V is ’ (Schwalb‐Willmann et al., 2020).…”

Section: Peer Reviewmentioning

confidence: 99%

Hierarchical computing for hierarchical models in ecology

2020

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Bayesian hierarchical models allow ecologists to account for uncertainty and make inference at multiple scales. However, hierarchical models are often computationally intensive to fit, especially with large datasets, and researchers face trade‐offs between capturing ecological complexity in statistical models and implementing these models. We present a recursive Bayesian computing (RB) method that can be used to fit Bayesian models efficiently in sequential MCMC stages to ease computation and streamline hierarchical inference. We also introduce transformation‐assisted RB (TARB) to create unsupervised MCMC algorithms and improve interpretability of parameters. We demonstrate TARB by fitting a hierarchical animal movement model to obtain inference about individual‐ and population‐level migratory characteristics. Our recursive procedure reduced computation time for fitting our hierarchical movement model by half compared to fitting the model with a single MCMC algorithm. We obtained the same inference fitting our model using TARB as we obtained fitting the model with a single algorithm. For complex ecological statistical models, like those for animal movement, multi‐species systems, or large spatial and temporal scales, the computational demands of fitting models with conventional computing techniques can limit model specification, thus hindering scientific discovery. Transformation‐assisted RB is one of the most accessible methods for reducing these limitations, enabling us to implement new statistical models and advance our understanding of complex ecological phenomena.

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moveVis: Animating movement trajectories in synchronicity with static or temporally dynamic environmental data in r

Cited by 19 publications

References 22 publications

The timing of breeding and independence for snow leopard females and their cubs

The timing of breeding and independence for snow leopard females and their cubs

Performance of a novel system for high-resolution tracking of marine fish societies

Hierarchical computing for hierarchical models in ecology

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