Prof Len Thomas

Prof Len Thomas
Professor of Statistics


My main research areas are: (1) Development of methods and software for estimating the size, density and distribution of wild animal and plant populations. I mostly work on a group of related methods called distance sampling. (2) Use of computer intensive methods to fit and compare stochastic models of wildlife population dynamics. Here, I mostly work on algorithms called particle filters. For more details about my work, including links to my publications, please see my personal home page.

source: symbiosis


28 (of 28 published available) for lt5 with keyword Density clear keyword filter. (source: University of St Andrews PURE)
Please click title of any item for full details

Basin-scale distribution of harbour porpoises in the Baltic Sea provides basis for effective conservation actions Ida Carlén, Len Thomas, Julia Carlström, Mats Amundin, Jonas Teilmann, Nick Tregenza, Jakob Tougaard, Jens C. Koblitz, Signe Sveegaard, Daniel Wennerberg, Olli Loisa, Michael Dähne, Katharina Brundiers, Monika Kosecka, Line Anker Kyhn, Cinthia Tiberi Ljungqvist, Iwona Pawliczka, Radomil Koza, Bartlomiej Arciszewski, Anders Galatius, Martin Jabbusch, Jussi Laaksonlaita, Jussi Niemi, Sami Lyytinen, Anja Gallus, Harald Benke, Penina Blankett, Krzysztof E. Skóra, Alejandro Acevedo-Gutiérrez
Biological Conservation 2018 vol.226 pp.42-53
Estimating effective detection area of static passive acoustic data loggers from playback experiments with cetacean vocalisations Hanna K. Nuuttila, Katharina Brundiers, Michael Dähne, Jens C. Koblitz, Len Thomas, Winnie Courtene-Jones, Peter G. H. Evans, John R. Turner, Jim D. Bennell, Jan G. Hiddink
Methods in Ecology and Evolution 2018 vol.9 pp.2362-2371
Fin whale density and distribution estimation using acoustic bearings derived from sparse arrays Danielle Harris, Jennifer L. Miksis-Olds, Julia A. Vernon, Len Thomas
Journal of the Acoustical Society of America 2018 vol.143 pp.2980-2993
Modelling the broadband propagation of marine mammal echolocation clicks for click-based population density estimates Alexander von Benda-Beckmann, Len Thomas, Peter Lloyd Tyack, Michael Ainslie
Journal of the Acoustical Society of America 2018 vol.143 pp.954-967
Quantifying injury to common bottlenose dolphins from the Deepwater Horizon oil spill using an age-, sex- and class-structured population model Lori H. Schwacke, Len Thomas, Randall S Wells, Wayne E. McFee, Aleta A. Hohn, Keith D. Mullin, Eric S. Zolman, Brian M. Quigley, Teri K. Rowles, John H. Schwacke
Endangered Species Research 2017 vol.33 pp.265-279
Spatio-temporal variation in click production rates of beaked whales Victoria E. Warren, Tiago A. Marques, Danielle Harris, Len Thomas, Peter Lloyd Tyack, Natacha Aguilar de Soto, Mark Johnson
Journal of the Acoustical Society of America 2017 vol.141 pp.1962-1974
Survival, density, and abundance of common bottlenose dolphins in Barataria Bay (USA) following the Deepwater Horizon oil spill Trent L. McDonald, Fawn E. Hornsby, Todd R. Speakman, Eric S. Zolman, Keith D. Mullin, Carrie Sinclair, Patricia E. Rosel, Len Thomas, Lori H. Schwacke
Endangered Species Research 2017 vol.33 pp.193-209
Techniques for estimating the size of low-density gopher tortoise populations Jonathan M. Stober, Lora L. Smith, Tiago A. Marques, Len Thomas
Journal of Fish and Wildlife Management 2017 vol.8 pp.377-386
Whale distribution in a breeding area Daniel Danilewicz, Philip Steven Hammond, Len Thomas, Alexandre N Zerbini
Marine Ecology Progress Series 2017 vol.585 pp.213-227
An efficient acoustic density estimation method with human detectors applied to gibbons in Cambodia Benjamin M. Rawson, David Louis Borchers, Ben Stevenson, Tiago A. Marques, Len Thomas
PLoS One 2016 vol.11 pp.1-16
A unifying model for capture-recapture and distance sampling surveys of wildlife populations David Louis Borchers, Ben Stevenson, Len Thomas, Tiago A. Marques
Journal of the American Statistical Association 2015 vol.110 pp.195-204
Inter-annual and seasonal trends in cetacean distribution, density and abundance off southern California G.S. Campbell, Len Thomas, K. Whitaker, A.B. Douglas, J. Calambokidis, J.A. Hildebrand
Deep Sea Research Part II: Topical Studies in Oceanography 2015 vol.112 pp.143-157
Passive acoustic monitoring of beaked whale densities in the Gulf of Mexico John Hildebrand, Simone Baumann-Pickering, Kaitlin Frasier, Jennifer Trickey, Karlina Merkens, Sean Wiggins, Mark McDonald, Lance Garrison, Danielle Harris, Tiago A. Marques, Len Thomas
Scientific Reports 2015 vol.5
Estimating animal population density using passive acoustics Tiago A. Marques, Len Thomas, Stephen Martin, David Mellinger, Jessica Ward, David Moretti, Danielle Harris, Peter Lloyd Tyack
Biological Reviews of the Cambridge Philosophical Society 2013 vol.88 pp.287–309
Evidence for density-dependent changes in body condition and pregnancy rate of North Atlantic fin whales over four decades of varying environmental conditions Gisli A. Vikingsson, Astthor Gislason, Christina Lockyer, Leslie New, Len Thomas, Philip Steven Hammond
ICES Journal of Marine Science 2013
Spatial models for distance sampling data David Lawrence Miller, M Louise Burt, Eric Rexstad, Len Thomas
Methods in Ecology and Evolution 2013 vol.4 pp.1001-1010
The effects of acoustic misclassification on cetacean species abundance estimation Len Thomas, Douglas Michael Gillespie
Journal of the Acoustical Society of America 2013 vol.134 pp.2469–2476
Global analysis of cetacean line-transect surveys Len Thomas, Catriona M Harris, Kristin Kaschner, Philip Steven Hammond,
Marine Ecology Progress Series 2012 vol.453 pp.227-240
Workshop on new developments in cetacean survey methods David Louis Borchers, Len Thomas, Stephen Terrence Buckland, Hans Skaug, Jay Barlow
Density estimation implications of increasing ambient noise on beaked whale click detection and classification Tiago A. Marques, Jessica Ward, Susan Jarvis, David Moretti, Ronald Morrissey, Nancy DiMarzio, Len Thomas
Design and analysis of line transect surveys for primates Stephen Terrence Buckland, A J Plumptre, Len Thomas, Eric Rexstad
International Journal of Primatology 2010 vol.31 pp.833-847
Line transect sampling of primates Stephen Terrence Buckland, A J Plumptre, Len Thomas, Eric Rexstad
International Journal of Primatology 2010 vol.31 pp.485-499
A critical review of the literature on population modelling Abigail Cabrelli, John Harwood, Jason Matthiopoulos, Leslie Frances New, Len Thomas

Contact Details:

Prof Len Thomas
The Observatory
Buchanan Gardens
University of St Andrews
St Andrews
KY16 9LZ

tel: (44) (0) 1334 461801
fax: (44) (0) 1334 461800
room: 208


Personal Homepage
Centre for Research into Ecological & Environmental Modelling
School of Mathematics & Statistics
National Centre for Statistical Ecology
Scottish Oceans Institute

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The Secretary
Scottish Oceans Institute
Institiud Chuantan na h-Alba
Gatty Marine Laboratory
East Sands St Andrews
KY16 8LB

tel: +44 (0) 1334 463472
fax: +44 (0) 1334 463443