Now showing items 1-12 of 12

    • Effects of a scientific echo sounder on the behavior of short-finned pilot whales (Globicephala macrorhynchus) 

      Quick, Nicola; Scott-Hayward, Lindesay; Sadykova, Dinara; Nowacek, Doug; Read, Andrew (2017-05) - Journal article
      Active echo sounding devices are often employed for commercial or scientific purposes in the foraging habitats of marine mammals. We conducted an experiment off Cape Hatteras, North Carolina, USA, to assess whether the ...
    • Estimation and simulation of foraging trips in land-based marine predators 

      Michelot, Theo; Langrock, Roland; Bestley, Sophie; Jonsen, Ian D.; Photopoulou, Theoni; Patterson, Toby A. (2017-07) - Journal article
      The behavior of colony-based marine predators is the focus of much research globally. Large telemetry and tracking data sets have been collected for this group of animals, and are accompanied by many empirical studies that ...
    • Incorporating animal movement with distance sampling and spatial capture-recapture 

      Glennie, Richard (University of St Andrews, 2018-12-06) - Thesis
      Distance sampling and spatial capture-recapture are statistical methods to estimate the number of animals in a wild population based on encounters between these animals and scientific detectors. Both methods estimate the ...
    • Individual, ecological, and anthropogenic influences on activity budgets of long-finned pilot whales 

      Isojunno, S.; Sadykova, D.; DeRuiter, S.; Curé, C.; Visser, F.; Thomas, L.; Miller, P. J. O.; Harris, C. M. (2017-12) - Journal article
      Time allocation to different activities and habitats enables individuals to modulate their perceived risks and access to resources, and can reveal important trade-offs between fitness-enhancing activities (e.g., feeding ...
    • Markov-switching generalized additive models 

      Langrock, Roland; Kneib, Thomas; Glennie, Richard; Michelot, Théo (2017-01) - Journal article
      We consider Markov-switching regression models, i.e. models for time series regression analyses where the functional relationship between covariates and response is subject to regime switching controlled by an unobservable ...
    • Maximum likelihood estimation of mark-recapture-recovery models in the presence of continuous covariates 

      Langrock, Roland; King, Ruth (2013) - Journal article
      We consider mark-recapture-recovery (MRR) data of animals where the model parameters are a function of individual time-varying continuous covariates. For such covariates, the covariate value is unobserved if the corresponding ...
    • Modelling group dynamic animal movement 

      Langrock, Roland; Hopcraft, Grant; Blackwell, Paul; Goodall, Victoria; King, Ruth; Niu, Mu; Patterson, Toby; Pedersen, Martin; Skarin, Anna; Schick, Robert Schilling (2014-02) - Journal article
      1). Group dynamics are a fundamental aspect of many species' movements. The need to adequately model individuals' interactions with other group members has been recognized, particularly in order to differentiate the role ...
    • Movement and biosonar behavior during prey encounters indicate that male sperm whales switch foraging strategy with depth 

      Isojunno, Saana; Miller, Patrick (2018-11-28) - Journal article
      Despite their apex predator role, relatively little is known about the foraging strategies that deep-diving marine mammals employ to target prey resources available at different depths with different costs of access. Using ...
    • Rebuilding beluga stocks in West Greenland 

      Heide-Jørgensen, M. P.; Hansen, R. G.; Fossette, S.; Nielsen, N. H.; Borchers, D. L.; Stern, H.; Witting, L. (2017-06) - Journal article
      Decisions about sustainable exploitation levels of marine resources are often based on inadequate data, but are nevertheless required for practical purposes. We describe one exception where abundance estimates spanning ...
    • Statistical ecology comes of age 

      Gimenez, Olivier; Buckland, Stephen Terrence; Morgan, Byron J. T.; Bez, Nicolas; Bertrand, Sophie; Choquet, Remi; Dray, Stephane; Etienne, Marie-Pierre; Fewster, Rachel; Gosselin, Frederic; Merigot, Bastien; Monestiez, Pascal; Morales, Juan M.; Mortier, Frederic; Munoz, Francois; Ovaskainen, Otso; Pavoine, Sandrine; Pradel, Roger; Schurr, Frank M.; Thomas, Len; Thuiller, Wilfried; Trenkel, Verena; de Valpine, Perry; Rexstad, Eric (2014-12-24) - Journal article
      The desire to predict the consequences of global environmental change has been the driver towards more realistic models embracing the variability and uncertainties inherent in ecology. Statistical ecology has gelled over ...
    • Statistical modelling of individual animal movement : an overview of key methods and a discussion of practical challenges 

      Patterson, Toby A.; Parton, Alison; Langrock, Roland; Blackwell, Paul G.; Thomas, Len; King, Ruth (2017-10) - Journal article
      With the influx of complex and detailed tracking data gathered from electronic tracking devices, the analysis of animal movement data has recently emerged as a cottage industry among biostatisticians. New approaches of ...
    • Using hidden Markov models to deal with availability bias on line transect surveys 

      Borchers, David Louis; Zucchini, Walter; Heide-Jørgensen, M.P.; Cañadas, A.; Langrock, Roland (2013) - Journal article
      We develop estimators for line transect surveys of animals that are stochastically unavailable for detection while within detection range. The detection process is formulated as a hidden Markov model with a binary ...