Now showing items 30-49 of 57

  • Guessing games on triangle-free graphs 

    Cameron, Peter Jephson; Dang, Anh; Riis, Soren (2016) - Journal article
    The guessing game introduced by Riis is a variant of the "guessing your own hats" game and can be played on any simple directed graph G on n vertices. For each digraph G, it is proved that there exists a unique guessing ...
  • Higher biodiversity is required to sustain multiple ecosystem processes across temperature regimes 

    Perkins, D.M.; Bailey, R.A.; Dossena, M.; Gamfeldt, L.; Reiss, J.; Trimmer, M.; Woodward, G. (2015-01) - Journal article
    Biodiversity loss is occurring rapidly worldwide, yet it is uncertain whether few or many species are required to sustain ecosystem functioning in the face of environmental change. The importance of biodiversity might be ...
  • Impacts of anthropogenic noise on marine life : publication patterns, new discoveries, and future directions in research and management 

    Williams, Robert; Wright, Andrew J; Ashe, Erin; Blight, LK; Bruintjes, R; Canessa, R; Clark, CW; Cullis-Suzuki, S; Dakin, DT; Erbe, C; Hammond, Philip Steven; Merchant, MD; O'Hara, PD; Purser, J; Radford, AN; Simpson, SD; Thomas, Len; Wale, MA (2015-10) - Journal article
    Anthropogenic underwater noise is now recognized as a world-wide problem, and recent studies have shown a broad range of negative effects in a variety of taxa. Underwater noise from shipping is increasingly recognized as ...
  • Inter-annual and seasonal trends in cetacean distribution, density and abundance off southern California 

    Campbell, G.S.; Thomas, L.; Whitaker, K.; Douglas, A.B.; Calambokidis, J.; Hildebrand, J.A. (2015-02) - Journal article
    Trends in cetacean density and distribution off southern California were assessed through visual line-transect surveys during thirty-seven California Cooperative Oceanic Fisheries Investigations (CalCOFI) cruises from July ...
  • Mixture models for distance sampling detection functions 

    Miller, David Lawrence; Thomas, Len (2015-03-20) - Journal article
    We present a new class of models for the detection function in distance sampling surveys of wildlife populations, based on finite mixtures of simple parametric key functions such as the half-normal. The models share many ...
  • 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 ...
  • Most primitive groups are full automorphism groups of edge-transitive hypergraphs 

    Babai, Laszlo; Cameron, Peter Jephson (2015-01-01) - Journal article
    We prove that, for a primitive permutation group G acting on a set of size n, other than the alternating group, the probability that Aut(X,YG) = G for a random subset Y of X, tends to 1 as n tends to infinity. So the ...
  • Most switching classes with primitive automorphism groups contain graphs with trivial groups 

    Cameron, Peter Jephson; Spiga, Pablo (2015-06) - Journal article
    The operation of switching a graph Gamma with respect to a subset X of the vertex set interchanges edges and non-edges between X and its complement, leaving the rest of the graph unchanged. This is an equivalence relation ...
  • Nested row-column designs for near-factorial experiments with two treatment factors and one control treatment 

    Bailey, Rosemary Anne; Lacka, Agnieszka (2015-10) - Journal article
    This paper presents some methods of designing experiments in a block design with nested rows and columns. The treatments consist of all combinations of levels of two treatment factors, with an additional control treatment.
  • Optimal cross-over designs for full interaction models 

    Bailey, Rosemary Anne; Druilhet, Pierre (2014-11) - Journal article
    We consider repeated measurement designs when a residual or carry-over effect may be present in at most one later period. Since assuming an additive model may be unrealistic for some applications and leads to biased ...
  • Passive acoustic monitoring of beaked whale densities in the Gulf of Mexico 

    Hildebrand, John; Baumann-Pickering, Simone; Frasier, Kaitlin; Trickey, Jennifer; Merkens, Karlina; Wiggins, Sean; McDonald, Mark; Garrison, Lance; Harris, Danielle; Marques, Tiago A.; Thomas, Len (2015-11-12) - Journal article
    Beaked whales are deep diving elusive animals, difficult to census with conventional visual surveys. Methods are presented for the density estimation of beaked whales, using passive acoustic monitoring data collected at ...
  • Permutation groups and transformation semigroups : results and problems 

    Araujo, Joao; Cameron, Peter Jephson (Cambridge University Press, 2015-10) - Book item
    J.M. Howie, the influential St Andrews semigroupist, claimed that we value an area of pure mathematics to the extent that (a) it gives rise to arguments that are deep and elegant, and (b) it has interesting interconnections ...
  • Procedure description : using AUTEC’s hydrophones surrounding a DTAGed whale to obtain localizations 

    Marques, Tiago A.; Shaeffer, Jessica; Moretti, David; Thomas, Len (University of St Andrews, 2015) - Report
  • Randomization-based models for multitiered experiments : I. a chain of randomizations 

    Bailey, Rosemary Anne; Brien, C. J. (2016-06) - Journal article
    We derive randomization-based models for experiments with a chain of randomizations. Estimation theory for these models leads to formulae for the estimators of treatment effects, their standard errors, and expected mean ...
  • A risk function for behavioral disruption of Blainville’s beaked whales (Mesoplodon densirostris) from mid-frequency active sonar 

    Moretti, David; Thomas, Len; Marques, Tiago A.; Harwood, John; Dilley, Ashley; Neales, Bert; Shaffer, Jessica; Mccarthy, E; New, Leslie Frances; Jarvis, S; Morrissey, Ron (2014-01) - Journal article
    There is increasing concern about the potential effects of noise pollution on marine life in the world’s oceans. For marine mammals, anthropogenic sounds may cause behavioral disruption, and this can be quantified using a ...
  • 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 ...
  • Spatial variation in maximum dive depth in gray seals in relation to foraging. 

    Photopoulou, Theoni; Fedak, Mike; Thomas, Len; Matthiopoulos, Jason (2014-07) - Journal article
    Habitat preference maps are a way of representing animals’ space use in two dimensions. For marine animals, the third dimension is an important aspect of spatial ecology. We used dive data from seven gray seals Halichoerus ...
  • 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 ...
  • Status and future of research on the behavioural responses of marine mammals to U.S. Navy sonar 

    Harris, Catriona M; Thomas, Len (University of St Andrews, 2015) - Report
    A review of the status and future of research into behavioral responses of marine mammals to naval sonar exposure was undertaken to evaluate the return on investment of current US Navy funded programs, identify the data ...
  • Tracking marine mammals in 3D using electronic tag data 

    Laplanche, C.; Marques, T.A.; Thomas, L. (2015-09) - Journal article
    1. Information about at-depth behaviour of marine mammals is fundamental yet very hard to obtain from direct visual observation. Animal-borne multisensor electronic tags provide a unique window of observation into such ...