scholarly journals Evaluating the Brownian Bridge Movement Model to Determine Regularities of People’s Movements

GI_Forum ◽  
2016 ◽  
Vol 2 ◽  
pp. 20-35 ◽  
Author(s):  
Verena Venek ◽  
Richard Brunauer ◽  
Cornelia Schneider
Keyword(s):  
Brownian Bridge ◽  
Movement Model ◽  
Brownian Bridge Movement Model

scholarly journals Deriving movement properties and the effect of the environment from the Brownian bridge movement model in monkeys and birds

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Kevin Buchin ◽  
Stef Sijben ◽  
E Emiel van Loon ◽  
Nir Sapir ◽  
Stéphanie Mercier ◽  
...  
Keyword(s):  
Brownian Bridge ◽  
Movement Model ◽  
Brownian Bridge Movement Model

scholarly journals Very Small Home Ranges of Two Gravid European Brown Bears during Hyperphagia

Animals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3580
Author(s):  
Laura Schulte ◽  
Daniele De Angelis ◽  
Natarsha Babic ◽  
Slaven Reljić
Keyword(s):  
National Park ◽  
Ursus Arctos ◽  
Brownian Bridge ◽  
Gravid Female ◽  
Food Resource ◽  
Home Ranges ◽  
Movement Model ◽  
Brown Bears ◽  
Feeding Sites ◽  
Brownian Bridge Movement Model

In September 2019, two gravid female brown bears (Ursus arctos) were captured and equipped with GPS/GSM collars in Paklenica National Park (Croatia). Home ranges during hyperphagia were analyzed to describe the spatiotemporal requirements. Mean seasonal home ranges were very small with 9.2 km2 and 7.5 km2 (Brownian Bridge Movement Model 95%). During the tracking period, both bears used different territories and showed little to no use of overlapping area. The bears in our study spent a considerable time in proximity of artificial feeding sites, indicating a probable use of these structures as a food resource (mean 15.7% and 30.7%). Furthermore, the bears approached very close to human structures such as 8.9 m and 4.4 m. As most encounters between humans and bears occur during hyperphagia, it is important to offer refugia from human disturbance, especially as the National Park is not only used by residents, but also by tourists. To adapt management according to the animal’s needs, further studies should include more individuals from different age and sex classes. Both females were gravid. It remains unclear whether gravidity has an effect on the home range and should be further investigated.

A dynamic Brownian bridge movement model to estimate utilization distributions for heterogeneous animal movement

2012 ◽  
Vol 81 (4) ◽  
pp. 738-746 ◽  
Author(s):  
Bart Kranstauber ◽  
Roland Kays ◽  
Scott D. LaPoint ◽  
Martin Wikelski ◽  
Kamran Safi
Keyword(s):  
Animal Movement ◽  
Brownian Bridge ◽  
Movement Model ◽  
Brownian Bridge Movement Model ◽  
Utilization Distributions

scholarly journals Long-Distance Movement of a Female Polar Bear from Canada to Russia

ARCTIC ◽  
2017 ◽  
Vol 70 (2) ◽  
pp. 121 ◽  
Author(s):  
Amy C. Johnson ◽  
Jodie D. Pongracz ◽  
Andrew E. Derocher
Keyword(s):  
Home Range ◽  
Sea Ice ◽  
Polar Bear ◽  
Brownian Bridge ◽  
Polar Bears ◽  
Minimum Convex Polygon ◽  
Long Distance ◽  
Movement Model ◽  
Female Polar Bear ◽  
Long Distance Movement

Polar bears (Ursus maritimus) display fidelity to large geographic regions, and their movements are influenced by sea ice distribution. Polar bear subpopulations are moderately distinct from one another, and long-distance movements between subpopulations are rare. We describe and analyze the movements of a female polar bear tracked by satellite telemetry from spring 2009 for 798 days. This female traveled an exceptionally long distance (totaling 11 686 km) from the sea ice off the Yukon Territory, Canada (Southern Beaufort Sea subpopulation) to Wrangel Island, Russia (Chukchi Sea subpopulation). In comparison to other polar bears in this study, this bear traveled farther, moved faster, and had a much larger home range in the first year. Furthermore, the calculation of the home range size by two different methods demonstrated that the commonly used minimum convex polygon method overestimated the home range compared to the less biased Brownian bridge movement model. This female’s long-distance movement was unusual and provides additional evidence for gene flow between subpopulations. Monitoring polar bear movements is useful to track such events, which is especially important at present because sea ice loss due to climate change can affect subpopulation boundaries and influence management.

scholarly journals No room to roam: King Cobras reduce movement in agriculture

2020 ◽  
Author(s):  
Benjamin Michael Marshall ◽  
Matt Crane ◽  
Inês Silva ◽  
Colin Thomas Strine ◽  
Max Dolton Jones ◽  
...  
Keyword(s):  
Land Use ◽  
Animal Movement ◽  
Brownian Bridge ◽  
Agricultural Landscapes ◽  
Movement Model ◽  
Habitat Patches ◽  
Landscape Features ◽  
Landscape Modification ◽  
Agricultural Areas ◽  
King Cobra

AbstractStudying animal movement provides insights into how animals react to land-use changes, specifically how animals can change their behaviour in agricultural areas. Recent reviews show a tendency for species to reduce movements in response to increased human landscape modification, but the study of movement has not been extensively explored in reptiles. We examined movements of a large reptilian predator, the King Cobra (Ophiophagus hannah), in Northeast Thailand. We used a consistent regime of radio-telemetry tracking to document movements across protected forest and adjacent agricultural areas. We then adapted GPS-targeting analytic methods to examine the movement using metrics of site reuse and dynamic Brownian Bridge Movement Model derived motion variance. Examination of motion variance demonstrated that King Cobra movements increased in forested areas and tended to decrease in agricultural areas. Our Integrated Step-Selection Functions indicated that when moving in agricultural areas King Cobras restricted their movements, thereby remaining within vegetated semi-natural areas, often located along the banks of irrigation canals. Site reuse metrics of residency time and number of revisits remained unaffected by distance to landscape features. Neither motion variance nor reuse metrics were consistently affected by the presence of threatening landscape features (e.g. roads, human settlements); suggesting that King Cobras will remain in close proximity to threats, provided habitat patches are available. Although King Cobras displayed heterogeneity in their response to agricultural landscapes, the overall trend suggested a reduction in movements when faced with fragmented habitat patches embedded in an otherwise inhospitable land-use matrix. Reductions in movements are consistent with findings for mammals and forest specialist species.

scholarly journals An Efficient Routing Protocol with Overload Control for Group Mobility in Delay-Tolerant Networking

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 521
Author(s):  
Min Wook Kang ◽  
Yun Won Chung
Keyword(s):  
Routing Protocol ◽  
Overload Control ◽  
Group Mobility ◽  
Movement Model ◽  
Delay Tolerant Networking ◽  
Group Movement ◽  
Dtn Routing ◽  
Military Networks ◽  
Delay Tolerant ◽  
Stable Routing

In delay-tolerant networking (DTN), messages are delivered to destination nodes by using opportunistic contacts between contact nodes, even if stable routing paths from source nodes to destination nodes do not exist. In some DTN network environments, such as military networks, nodes movement follows a group movement model, and an efficient DTN routing protocol is required to use the characteristics of group mobility. In this paper, we consider a network environment, where both intra- and intergroup routing are carried out by using DTN protocols. Then, we propose an efficient routing protocol with overload control for group mobility, where delivery predictability for group mobility is defined and proactive overload control is applied. Performance evaluation results show that the proposed protocol had better delivery ratios and overhead ratios than compared protocols, although the delivery latency was increased.

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