Profile

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

 

Recent publications


50  (of 147 published available) for lt5. (source: University of St Andrews PURE)
Please click title of any item for full details.

2018 (8)

(Commissioned report)
2018 (10)
Biological Conservation
vol.226 pp.42-53
(Article)
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 
Keywords: Spatial distribution, Passive acoustic monitoring, Population structure, Harbour porpoise, Marine protected areas, Biodiversity conservation
2018 (1)
Marine Pollution Bulletin
vol.126 pp.1-18
(Review article)
Comparing methods suitable for monitoring marine mammals in low visibility conditions during seismic surveys
Ursula K. Verfuss, Douglas Michael Gillespie, Jonathan Charles David Gordon, Tiago A. Marques, Brianne Miller, Rachael Plunkett, James A. Theriault, Dominic John Tollit, Daniel P. Zitterbart, Philippe Hubert, Len Thomas 
Keywords: Marine mammals, Monitoring methods, Underwater noise, Seismic survey, Detection performance, Low visibility
2018 (12)
Methods in Ecology and Evolution
vol.9 pp.2362-2371
(Article)
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 
Keywords: Abundance, C-POD, Density estimation, Detection function, Effective detection radius, Static passive acoustic monitoring
2018 (27/3)

(Other report)

Journal of the Acoustical Society of America
vol.143 pp.2980-2993
(Article)
2018 (1)
Journal of Applied Ecology
vol.55 pp.396-404
(Review article)
Marine mammals and sonar
Catriona M Harris, Len Thomas, Erin Falcone, John Hildebrand, Dorian Houser, Petter Kvadsheim, Frans-Peter A. Lam, Patrick Miller, David J. Moretti, Andrew Read, Hans Slabbekoorn, Brandon L. Southall, Peter Lloyd Tyack, Douglas Wartzok, Vincent Janik 
Keywords: Sonar, Cetaceans, Human disturbance, Impact assessment, Anti-predator response, Anthropogenic noise, Behavioural response, Marine mammals, Dose response
2018 (2)
Journal of the Acoustical Society of America
vol.143 pp.954-967
(Article)
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 

Ecology and Evolution
vol.Early View 
(Review article)
Understanding the population consequences of disturbance
Enrico Pirotta, Daniel P. Costa, Erica Fleishman, Scott D. Kraus, David Lusseau, David Moretti, Leslie Frances New, Robert Schilling Schick, Lisa K. Schwarz, Samantha E. Simmons, Len Thomas, Peter Lloyd Tyack, Michael J. Weise, Randall S. Wells, John Harwood 
Keywords: Anthropogenic disturbance, Environmental impact assessments, Marine mammals, Nonconsumptive effects, Population consequences, Trait-mediated indirect interactions, Uncertainty
2017 (5/5)

(Commissioned report)
2017

(Commissioned report)
Approaches to Understanding the Cumulative Effects of Stressors on Marine Mammals
Peter Lloyd Tyack, Helen Bailey, Daniel Crocker, James E Estes, Clinton D Francis, John Harwood, Lori Schwacke, Len Thomas, Douglas Wartzok 
2017 (31/1)
Endangered Species Research
vol.33 pp.235-252
(Article)
Assigning stranded bottlenose dolphins to source stocks using stable isotope ratios following the Deepwater Horizon oil spill
A A Hohn, Len Thomas, R. H. Carmichael, J. Litz, C. Clemons-Chevis, S. F. Shippee, C. Sinclair, S. Smith, T. R. Speakman, M. C. Tumlin, E. S. Zolman 
Keywords: Carbon, Gulf of Mexico, Nitrogen, Stock structure, Sulfur, Tursiops truncatusEcology, Nature and Landscape Conservation
2017 (9)
Environmental and Ecological Statistics
vol.24 pp.399-414
(Article)
2017 (12/10)
Conservation Letters
vol.10 pp.588-595
(Letter)
Extinction is imminent for Mexico’s endemic porpoise unless fishery bycatch is eliminated
Barbara L Taylor, Lorenzo Rojas-Bracho, Jeffrey Moore, Armando Jaramillo-Legorreta, Jay M Ver Hoef, Gustavo Cardenas-Hinojosa, Edwyna Nieto-Garcia, Jay Barlow, Tim Gerrodette, Nicholas Tregenza, Len Thomas, Philip Steven Hammond 
Keywords: Extinction, Illegal fishing, Line transect, Phocoena sinus, Totoaba macdonaldi, Vaquita abundance , Passive acoustic monitoring , C-POD
2017 (12)
Ecosphere
vol.8 
(Article)
Individual, ecological, and anthropogenic influences on activity budgets of long-finned pilot whales
Saana Isojunno, Dinara Sadykova, Stacy Lynn De Ruiter, Charlotte Curé, Fleur Visser, Len Thomas, Patrick Miller, Catriona M Harris 
Keywords: Anthropogenic noise, Activity synchrony, Benthic habitat, Deep diving mammal, DTAG, Ethogram, Globicephala melas, Hidden Markov model, Naval sonar
2017 (11)
Journal of the Acoustical Society of America
vol.142 pp.EL512-EL517
(Article)
Last call: Passive acoustic monitoring shows continued rapid decline of critically endangered vaquita
Len Thomas, Armando Jaramillo-legorreta, Gustavo Cardenas-hinojosa, Edwyna Nieto-garcia, Lorenzo Rojas-bracho, Jay M. Ver Hoef, Jeffrey Moore, Barbara Taylor, Jay Barlow, Nicholas Tregenza 
2017 (7)
Ecological Applications
vol.27 pp.1694-1698
(Letter)
Model-based approaches to deal with detectability
Tiago A. Marques, Len Thomas, Marc Kery, Stephen Terrence Buckland, David Louis Borchers, Eric Rexstad, Rachel M. Fewster, Darryl I. Mackenzie, J. Andrew Royle, Gurutzeta Guillera-Arroita, Colleen M. Handel, David C. Pavlacky, Richard Joseph Camp 
Keywords: Relative-abundance, Distance, Occupancy
2017 (2)
Conservation Biology
vol.31 pp.183-191
(Article)
Passive acoustic monitoring of the decline of Mexico's critically endangered vaquita
Armando Jaramillo-Legorreta, Gustavo Cardenas-Hinojosa, Edwyna Nieto-Garcia, Lorenzo Rojas-Bracho, Jay Ver Hoef, Jeffrey Moore, Nicholas Tregenza, Jay Barlow, Tim Gerrodette, Len Thomas, Barbara Taylor 
Keywords: Extinction, Phocoena sinus, Population decline, Statistical modeling
2017 (31/1)
Endangered Species Research
vol.33 pp.265-279
(Article)
2017 (3)
Journal of the Acoustical Society of America
vol.141 pp.1962-1974
(Article)
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 
Keywords: Arts and Humanities (miscellaneous), Acoustics and Ultrasonics
2017 (31/1)
Endangered Species Research
vol.33 pp.193-209
(Article)
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 
Keywords: Capture-recapture, Photo-identification, Robust design, Spatial-capture model, Tursiops truncatusEcology, Nature and Landscape Conservation
2017 (27/12)
Marine Ecology Progress Series
vol.585 pp.213-227
(Article)
Whale distribution in a breeding area
Daniel Danilewicz, Philip Steven Hammond, Len Thomas, Alexandre N Zerbini 
Keywords: Shelter, Conservation, Density surface model, Cetacean, Line transect, Reproduction
2016 (28/12)
PLoS One
vol.11 
(Article)
An assessment of the population of cotton-top tamarins (Saguinus oedipus) and their habitat in Colombia
Anne Savage, Len Thomas, Katie L. Feilen, Luis H. Soto, Mackenzie Pearson, Felix S. Medina, German Emeris, Rosamira R. Guillen 
Keywords: Medicine(all), Biochemistry, Genetics and Molecular Biology(all), Agricultural and Biological Sciences(all)
2016 (19/5)
PLoS One
vol.11 pp.1-16
(Article)
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 
2016 (1/6)

(Commissioned report)
2016 (9)
Journal of the Acoustical Society of America
vol.140 pp.1918-1930
(Article)
Delphinid echolocation click detection probability on near-seafloor sensors
Kaitlin E. Frasier, Sean M. Wiggins, Danielle Harris, Tiago A. Marques, Len Thomas, John A. Hildebrand 
Keywords: Arts and Humanities (miscellaneous), Acoustics and Ultrasonics
2016 (1/1)
pp.45-51
(Chapter)
Distance sampling surveys of population size
Stephen Terrence Buckland, Eric Rexstad, Len Thomas, David Louis Borchers 
Keywords: Mathematics(all)
2016 (12)
Proceedings of Meetings on Acoustics
vol.27 
(Review article)
From physiology to policy
Natacha Aguilar de Soto, Sascha Kate Hooker, Saana Isojunno, Mark Johnson, Patrick Miller, Peter Lloyd Tyack, Paul Wensveen, Carl Robert Donovan, Catriona M Harris, Danielle Harris, Laura Helen Marshall, Cornelia Sabrina Oedekoven, Rocio Prieto, Len Thomas 
2016 (8)
Marine Policy
vol.70 pp.58-64
(Article)
2016

(Other report)
Marine Strategy Framework Directive. Estimating the European Grey Seal population
Debbie JF Russell, Nora Nell Hanson, Len Thomas 
Keywords: SCOS
2016 (2/5)
Endangered Species Research
vol.30 pp.95-108
(Article)
Modeling the aggregated exposure and responses of bowhead whales Balaena mysticetus to multiple sources of anthropogenic underwater sound
William T. Ellison, Roberto Racca, Christopher W. Clark, Bill Streever, Adam S. Frankel, Erica Fleishman, Robyn Angliss, Joel Berger, Darlene Ketten, Melania Guerra, Matthias Leu, Megan McKenna, Todd Sformo, Brandon Southall, Robert Suydam, Len Thomas 
Keywords: Arctic, Cumulative effects, Harassment, Incidental take, Marine mammals, Negligible impact
2016 (7)
Marine Mammal Science
vol.32 pp.1004-1021
(Article)
Monitoring population-level responses of marine mammals to human activities
Erica Fleishman, Daniel P. Costa, John Harwood, Scott Kraus, David Moretti, Leslie F. New, Robert Schilling Schick, Lisa K. Schwarz, Samantha E. Simmons, Len Thomas, Randall S. Wells 
Keywords: Acoustics, Environmental impact statements, Marine Mammal Protection Act, Results chains, Take, Vital rates
2016
vol.517 
(Commissioned report)
Revised Phase III Data Analysis of Joint Cetacean Protocol Data Resources with Advisory Note
Charles G. M. Paxton, Lindesay Alexandra Sarah Scott-Hayward, Monique Lea MacKenzie, Eric Rexstad, Len Thomas 
2016
pp.399-407
(Conference contribution)
The challenges of analyzing behavioral response study data
Catriona M Harris, Len Thomas, Dinara Sadykova, Stacy Lynn De Ruiter, Peter Lloyd Tyack, Brandon L. Southall, Andrew J. Read, Patrick Miller 
Keywords: Sonar, Cetaceans, Change-point, Dose-response, State-space modelling
2015 (30/10)

(Other report)
A description of LATTE outputs
Tiago A. Marques, Len Thomas 
2015
Journal of the American Statistical Association
vol.110 pp.195-204
(Article)
2015

(Web publication/site)
Accompanying Marine Mammals into the Abyss
C Laplanche, Tiago A. Marques, Len Thomas 
2015 (13/10)
Methods in Ecology and Evolution
vol.6 pp.1150-1158
(Article)
An interim framework for assessing the population consequences of disturbance
Robert Schilling Schick, Carl Robert Donovan, Mark Burgman, Len Thomas, John Harwood 
2015 (1/6)

(Commissioned report)
2015 (20/11)
Ecosphere
vol.6 
(Article)
2015 (3)
Methods in Ecology and Evolution
vol.6 pp.278-288
(Article)
2015 (10)
Ocean and Coastal Management
vol.115 pp.17-24
(Article)
Impacts of anthropogenic noise on marine life
Andrew J Wright, LK Blight, R Bruintjes, R Canessa, CW Clark, S Cullis-Suzuki, DT Dakin, C Erbe, Philip Steven Hammond, MD Merchant, PD O'Hara, J Purser, AN Radford, SD Simpson, Len Thomas, MA Wale 
Keywords: Anthropogenic, Conservation, Ecology, Marine, Ocean noise, Policy, Shipping
2015 (2)
Deep Sea Research Part II: Topical Studies in Oceanography
vol.112 pp.143-157
(Article)
2015 (20/3)
PLoS One
vol.10 
(Article)
2015 (12/11)
Scientific Reports
vol.5 
(Article)
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 

Contact Details:

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

tel: (44) (0) 1334 461801
fax: (44) (0) 1334 461800
room: 208
email: lt5@st-andrews.ac.uk

Related:

research@st-andrews
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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Contact

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

tel: +44 (0) 1334 463472
fax: +44 (0) 1334 463443
email: soi@st-andrews.ac.uk

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