Now showing items 1-10 of 10

    • Animal Counting Toolkit : a practical guide to small-boat surveys for estimating abundance of coastal marine mammals 

      Williams, Rob; Ashe, Erin Elizabeth; Gaut, Katie; Gryba, Rowenna; Moore, Jeffrey E.; Rexstad, Eric; Sandilands, Doug; Steventon, Justin; Reeves, Randall (2017-08-10) - Journal article
      Small cetaceans (dolphins and porpoises) face serious anthropogenic threats in coastal habitats. These include bycatch in fisheries; exposure to noise, plastic and chemical pollution; disturbance from boaters; and climate ...
    • Comparing pre- and post-construction distributions of long-tailed ducks Clangula hyemalis in and around the Nysted offshore wind farm, Denmark : a quasi-designed experiment accounting for imperfect detection, local surface features and autocorrelation 

      Petersen, Ib Krag; MacKenzie, Monique Lea; Rexstad, Eric; Wisz, Mary S.; Fox, Anthony D. (University of St Andrews, 2011) - Report
      We report a novel technique to model abundance patterns of wintering seaducks in relation to the construction of an offshore wind farm (OWF) based on seven years of aerial survey transect data. Distance sampling was used ...
    • Comparison of aerial survey methods for estimating abundance of common scoters 

      Rexstad, Eric; Buckland, Stephen T. (CREEM, University of St Andrews, 2009) - Report
      During the month of March, four survey methods were applied to the SPA at Camarthen Bay. WWT staff carried out visual aerial surveys using distance sampling methodology (Camphuysen et al. 2004). Visual shore-based counts ...
    • 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 software: design and analysis of distance sampling surveys for estimating population size 

      Thomas, Len; Buckland, Stephen Terrence; Rexstad, Eric; Laake, J L; Strindberg, S; Hedley, S L; Bishop, J R B; Marques, Tiago A. (2010) - Journal article
      1. Distance sampling is a widely used technique for estimating the size or density of biological populations. Many distance sampling designs and most analyses use the software Distance. 2. We briefly review distance sampling ...
    • Line transect sampling of primates : can animal-to-observer distance methods work? 

      Buckland, Stephen Terrence; Plumptre, A J; Thomas, Len; Rexstad, Eric (2010-06) - Journal article
      Line transect sampling is widely used for estimating abundance of primate populations. Animal-to-observer distances (AODs) are commonly used in analysis, in preference to perpendicular distances from the line. This is in ...
    • Non-uniform coverage estimators for distance sampling. 

      Rexstad, Eric (CREEM, University of St Andrews, 2007) - Report
      Allocation of sampling effort in the context of distance sampling is considered. Specifically, allocation of effort in proportion to portions of the survey region that likely contain high concentrations of animals are ...
    • Point and interval estimates of abundance using multiple covariate distance sampling: an example using great bustards. 

      Rexstad, Eric (CREEM, University of St Andrews, 2007) - Report
      Description of computations to produce sex-specific estimates of density from a multiple-covariate distance sampling analysis. Program Distance 5.0 has limited capacity to bootstrap certain types of analytical situations ...
    • 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 ...
    • 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 ...