Dynamic Approach to Space and Habitat Use Based on Biased Random BridgesReportar como inadecuado

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Although habitat use reflects a dynamic process, most studies assess habitat use statically as if an animal-s successively recorded locations reflected a point rather than a movement process. By relying on the activity time between successive locations instead of the local density of individual locations, movement-based methods can substantially improve the biological relevance of utilization distribution UD estimates i.e. the relative frequencies with which an animal uses the various areas of its home range, HR. One such method rests on Brownian bridges BBs. Its theoretical foundation purely and constantly diffusive movements is paradoxically inconsistent with both HR settlement and habitat selection. An alternative involves movement-based kernel density estimation MKDE through location interpolation, which may be applied to various movement behaviours but lacks a sound theoretical basis.

Methodology-Principal Findings

I introduce the concept of a biased random advective-diffusive bridge BRB and show that the MKDE method is a practical means to estimate UDs based on simplified isotropically diffusive BRBs. The equation governing BRBs is constrained by the maximum delay between successive relocations warranting constant within-bridge advection allowed to vary between bridges but remains otherwise similar to the BB equation. Despite its theoretical inconsistencies, the BB method can therefore be applied to animals that regularly reorientate within their HRs and adapt their movements to the habitats crossed, provided that they were relocated with a high enough frequency.


Biased random walks can approximate various movement types at short times from a given relocation. Their simplified form constitutes an effective trade-off between too simple, unrealistic movement models, such as Brownian motion, and more sophisticated and realistic ones, such as biased correlated random walks BCRWs, which are too complex to yield functional bridges. Relying on simplified BRBs proves to be the most reliable and easily usable way to estimate UDs from serially correlated relocations and raw activity information.

Autor: Simon Benhamou

Fuente: http://plos.srce.hr/


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