Angela Watkins Jason Noble and C. Patrick Doncaster.
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Transcript of Angela Watkins Jason Noble and C. Patrick Doncaster.
![Page 1: Angela Watkins Jason Noble and C. Patrick Doncaster.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649ea95503460f94bae2d8/html5/thumbnails/1.jpg)
An agent-based model of jaguar movements through
conservation corridorsAngela Watkins
Jason Noble and C. Patrick Doncaster
![Page 2: Angela Watkins Jason Noble and C. Patrick Doncaster.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649ea95503460f94bae2d8/html5/thumbnails/2.jpg)
Background Aims Methodology The Model Results Conclusion Current Work
Order of Events
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Background
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The most important threats to global biodiversity
Less habitat means fewer individuals
Populations become increasingly isolated
Habitat loss and fragmentation
Pictures taken from advocacy.britannica.com, dailyreckoning.com.au, king.portlandschools.org
respectively.
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Connect local sub-populations Reduce the risk of local extinctions
Effective conservation requires the description of a landscape from an
individual species’ perspective in order to measure, understand and conserve
‘functional habitat connectivity’
Corridors, Connectivity and Conservation
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Largest cat in the Americas, third largest in the world
Apex predator and keystone species Territorial and solitary Preferred habitat:
◦ Tropical rainforest◦ Subtropical rainforest
Jaguar
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Jaguar range
Historic Range
Current Range
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Link between two protected areas
Critical area linking populations to the north and the south
Subject to urban expansion
Central Belize Corridor
Jaguar Corridors
Jaguar Populations
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Aims
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Build a simple agent-based model of jaguar movement
Explore the effect of landscape structure on the population
Investigate how corridors can connect discrete habitat patches
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Methodology
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Individual agents represent individual organisms
Interactions between individuals
Interactions between individuals and the landscape
Agents encoded with rules that mimic simplified real behaviours
Agent-based simulations
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Least-cost models
Habitat maps used to ‘cost’ the landscape
Species-specific
‘Organisms use a route of least resistance’
Taken from: Rabinowitz, A. & Zeller, K. A. (2010) A range-wide model of landscape connectivity and conservation for the
Jaguar, Panthera Onca. Biological Conservation 143: 939-945.
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The Model
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Model landscapes
3 controls
3 non-connected
3 connected
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Cost Values
Habitat Cost
Forest 1
Edge 5
Non-forest 25
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9-cell Moore neighbourhoods
Sex-specific movement rates◦ Males - 100%, females – 70%
Sex-specific territoriality◦ Pheromones add a cost to the cell
5% random moves
Model parameters
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Results
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Clearly identified territories and habitat choice
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No strong difference in average landscape cost value
Map Layout
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Connected corridors promote movement between patches
Map Layout
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Conclusions
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Plausible territorial behaviour
Not all corridors are the same
Critical feature for cost: amount of habitat
Key difference:
capacity to promote migration from one patch to another
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Current Work
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Integrate model with real-world GIS data Validate agent movement with empirical
data
Aims
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![Page 27: Angela Watkins Jason Noble and C. Patrick Doncaster.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649ea95503460f94bae2d8/html5/thumbnails/27.jpg)
![Page 28: Angela Watkins Jason Noble and C. Patrick Doncaster.](https://reader035.fdocuments.in/reader035/viewer/2022062518/56649ea95503460f94bae2d8/html5/thumbnails/28.jpg)
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Least-cost route choice Pheromones Male preference for trails Female avoidance of males? Difference in movement inside vs.
outside Cockscomb? Male vs. female movement rates
Key Parameters
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SupervisorsJason Noble and C. Patrick Doncaster
Jaguar Corridor InitiativeBart Harmsen and Rebecca Foster
This work was supported by an EPSRC Doctoral Training Centre grant (EP/G03690X/1).
Acknowledgements
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Any questions?