Now showing items 1-9 of 9

    • Accuracy and precision of dolphin group size estimates 

      Gerrodette, Tim; Perryman, Wayne L.; Oedekoven, Cornelia S. (2019-01) - Journal article
      Estimating the number of dolphins in a group is a challenging task. To assess the accuracy and precision of dolphin group size estimates, observer estimates were compared to counts from large‐format vertical aerial ...
    • Distance sampling in R 

      Miller, David L.; Rexstad, Eric; Thomas, Len; Marshall, Laura; Laake, Jeffrey L. (2019-05-09) - Journal article
      Estimating the abundance and spatial distribution of animal and plant populations is essential for conservation and management. We introduce the R package Distance that implements distance sampling methods to estimate ...
    • Distance sampling with a random scale detection function 

      Oedekoven, C.S.; Laake, J.L.; Skaug, H.J. (2015-12) - Journal article
      Distance sampling was developed to estimate wildlife abundance from observational surveys with uncertain detection in the search area. We present novel analysis methods for estimating detection probabilities that make use ...
    • Double-observer line transect surveys with Markov-modulated Poisson process models for overdispersed animal availability 

      Borchers, David Louis; Langrock, Roland (2015-12) - Journal article
      We develop maximum likelihood methods for line transect surveys in which animals go undetected at distance zero, either because they are stochastically unavailable while within view or because they are missed when they are ...
    • Estimating abundance of rare, small mammals: A case study of the Key Largo woodrat (Neotoma floridana smalli) 

      Potts, Joanne M. (University of St Andrews, 2011) - Thesis
      Estimates of animal abundance or density are fundamental quantities in ecology and conservation, but for many species such as rare, small mammals, obtaining robust estimates is problematic. In this thesis, I combine elements ...
    • Estimating whale abundance using sparse hydrophone arrays 

      Harris, Danielle Veronica (University of St Andrews, 2012-06-20) - Thesis
      Passive acoustic monitoring has been used to investigate many aspects of marine mammal ecology, although methods to estimate absolute abundance and density using acoustic data have only been developed in recent years. The ...
    • Large scale surveys for cetaceans : line transect assumptions, reliability of abundance estimates and improving survey efficiency – A response to MacLeod 

      Hammond, Philip Steven; Gillespie, Douglas Michael; Lovell, Philip; Samarra, Filipa Isabel Pereira; Swift, Rene James; Macleod, Kelly; Tasker, Mark L; Berggren, Per; Borchers, David Louis; Burt, M Louise; Paxton, Charles G. M.; Canadas, Ana; Desportes, Genevieve; Donovan, Greg P; Gilles, Anita; Lehnert, Kristina; Siebert, Ursula; Gordon, Jonathan Charles David; Leaper, Russell; Leopold, Mardik; Scheidat, Meike; Oien, Nils; Ridoux, Vincent; Rogan, Emer; Skov, Henrik; Teilmann, Jonas; Van Canneyt, Olivier; Vazquez, Jose Antonio (2014-02) - Journal item
    • Spatial models for distance sampling data : recent developments and future directions 

      Miller, David Lawrence; Burt, M Louise; Rexstad, Eric; Thomas, Len (2013-11) - Journal article
      Our understanding of a biological population can be greatly enhanced by modelling their distribution in space and as a function of environmental covariates. Density surface models consist of a spatial model of the abundance ...
    • A unifying model for capture-recapture and distance sampling surveys of wildlife populations 

      Borchers, D. L.; Stevenson, B.C.; Kidney, D.; Thomas, L.; Marques, Tiago A. (2015) - Journal article
      Spatially explicit capture-recapture (SECR) methods extend traditional capture-recapture methods for estimating population density by using information contained in the location of traps. The The central feature of the ...