A synoptic model of animal space use: Simultaneous estimation of home range, habitat selection, and inter/intra-specific relationships

Horne, Jon S.; Garton, Edward O.; Rachlow, Janet L.

doi:10.1016/j.ecolmodel.2008.02.042

Cited by 72 publications

(108 citation statements)

References 37 publications

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“…Such indices may be particularly important in conservation decision-making for patchily-distributed species, and can aid in the identification and assessment of critical habitat both in and between current population patches (Harris et al 2008). One range modeling method, the synoptic model of animal space use, couples home range models with resource selection to characterize the influences of environmental variables on species utilization distributions (Horne et al 2008). Future studies should incorporate models like the synoptic space use model, to further our understanding of species range patterns, and inform conservation planning.…”

Section: Discussionmentioning

confidence: 99%

Subpopulation range estimation for conservation planning: a case study of the critically endangered Cross River gorilla

Sawyer

2012

Biodivers Conserv

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Measuring and characterizing the area utilized by a population or species is essential for assessment of conservation status and for effective allocation of habitat to ensure population persistence. Yet population-level range delineation is complicated by the variety of available techniques coupled with a lack of empirical methods to compare the relative value of these techniques. This study assesses the effect of model choice on resulting subpopulation range estimation for the critically endangered and patchily distributed Cross River gorilla, and evaluates the conservation conclusions that can be drawn from each model. Models considered range from basic traditional approaches (e.g. minimum convex polygon) to newer home range techniques such as local convex hull (LoCoH). Overlap analysis comparing sub-sampled to complete data sets are used to evaluate the robustness of various modeling techniques to data limitations. Likelihood cross validation criterion is employed to compare core range model performance. Results suggest that differing LoCoH models produce similar range estimates, are robust to data requirements, provide a good fit for core habitat estimation, and are best able to detect unused habitat within the subpopulation range. LoCoH methods may thus be useful for studies into habitat selection and factors limiting endangered species distributions. However, LoCoH models tend to over-fit data, and kernel methods may provide similar information about animal space use while supporting protection of larger swaths of critical habitat. Subpopulation range analyses for conservation/management planning should therefore explore multiple modeling techniques, and employ both qualitative and quantitative assessments to select the best models to inform decision making for species of conservation concern.

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Section: Discussionmentioning

confidence: 99%

Subpopulation range estimation for conservation planning: a case study of the critically endangered Cross River gorilla

Sawyer

2012

Biodivers Conserv

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“…These counts can be assumed to represent elephant refuges during the crop-monitoring period because the elephant population size and spatial distribution did not change significantly during the study period (Lobora 2010;Pittiglio et al 2013). The kernel smoothing parameter h was selected through the likelihood cross validation method (Horne and Garton 2006) using Animal Space Use 1.3. beta (Horne and Garton 2009). A threshold of 95 % of the probability volume contour (Kernohan et al 2001) defined the boundaries of the elephant refuges and of the cropraiding zones.…”

Section: Mapping Small and Large Farmsmentioning

confidence: 99%

Smallholder Farms as Stepping Stone Corridors for Crop-Raiding Elephant in Northern Tanzania: Integration of Bayesian Expert System and Network Simulator

Pittiglio

Skidmore

Gils

et al. 2013

AMBIO

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Crop-raiding elephants affect local livelihoods, undermining conservation efforts. Yet, crop-raiding patterns are poorly understood, making prediction and protection difficult. We hypothesized that raiding elephants use corridors between daytime refuges and farmland. Elephant counts, crop-raiding records, household surveys, Bayesian expert system, and least-cost path simulation were used to predict four alternative categories of daily corridors: (1) footpaths, (2) dry river beds, (3) stepping stones along scattered small farms, and (4) trajectories of shortest distance to refuges. The corridor alignments were compared in terms of their minimum cumulative resistance to elephant movement and related to crop-raiding zones quantified by a kernel density function. The ''stepping stone'' corridors predicted the crop-raiding patterns. Elephant presence was confirmed along these corridors, demonstrating that small farms located between refuges and contiguous farmland increase habitat connectivity for elephant. Our analysis successfully predicted elephant occurrence in farmland where daytime counts failed to detect nocturnal presence. These results have conservation management implications.

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“…To avoid over-or under-smoothing the data (Illian et al, 2008), the smoothing parameter h was selected through the likelihood cross validation (CVh) method (Horne and Garton, 2006). To calculate the elephant CVh per season we used Animal Space Use 1.3. beta (Horne and Garton, 2009). Kernel analysis was performed using Hawth's analysis tools 3.27 (Beyer, 2004).…”

Section: Estimate Of Elephant Seasonal Presencementioning

confidence: 95%

Identifying transit corridors for elephant using a long time-series

Pittiglio

Skidmore

Gils

et al. 2012

International Journal of Applied Earth Observation and Geoinfor

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A synoptic model of animal space use: Simultaneous estimation of home range, habitat selection, and inter/intra-specific relationships

Cited by 72 publications

References 37 publications

Subpopulation range estimation for conservation planning: a case study of the critically endangered Cross River gorilla

Subpopulation range estimation for conservation planning: a case study of the critically endangered Cross River gorilla

Smallholder Farms as Stepping Stone Corridors for Crop-Raiding Elephant in Northern Tanzania: Integration of Bayesian Expert System and Network Simulator

Identifying transit corridors for elephant using a long time-series

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