Identifying stationnary phases in animal movement


Séminaire Données et Aléatoire Théorie & Applications

15/04/2021 - 14:00 Mme Marie-Pierre Etienne (Agrocampus Ouest) Zoom

Movement of organisms is one of the main mechanisms who govern relations between species. Advances in biologging open promising perspectives in the study of animal movements at numerous scales. It is now possible to record time series of animal locations over extended areas and long durations with a high spatial and temporal resolution. Such time series are rarely stationary  as the animal may alternate between different movement phases. Those phases are assumed to be linked to some internal states of the animals.  Movement models  which include a hidden state driven by a Markov process are classically used to address this non stationarity and to assign a cluster to each identified phase. However the Markov assumption induces constraints on the distribution of the length of the different movement phases. We explore an alternative to Markov model based on a segmentation clustering method using change point detection approach which can be combined with different movement models.

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