Now showing items 1-7 of 7

  • Density estimation and time trend analysis of large herbivores in Nagarhole, India 

    Gangadharan, Aditya (2005) - Thesis
    Density estimates for six large herbivore species were obtained through analysis of line transect data from Nagarhole National Park, south-western India, collected between 1989 and 2000. These species were Chital (Axis ...
  • Distance sampling detection functions : 2D or not 2D? 

    Borchers, David Louis; Cox, Martin James (2016-10-17) - Journal article
    Conventional distance sampling (CDS) methods assume that animals are uniformly distributed in the vicinity of lines or points. But when animals move in response to observers before detection, or when lines or points are ...
  • The effect of sea-ice loss on beluga whales (Delphinapterus leucas) in West Greenland 

    Heide-Jørgensen, M. P.; Laidre, K. L.; Borchers, David Louis; Marques, Tiago A.; Stern, H.; Simon, M. (2010) - Journal article
    An aerial survey was conducted to estimate the abundance of belugas (Delphinapterus leucas) on their wintering ground in West Greenland in March–April 2006 and 2008. The survey was conducted as a double platform aerial ...
  • Extinction is imminent for Mexico’s endemic porpoise unless fishery bycatch is eliminated 

    Taylor, Barbara L.; Rojas-Bracho, Lorenzo; Moore, Jeffrey; Jaramillo-Legorreta, Armando; Ver Hoef, Jay M.; Cardenas-Hinojosa, Gustavo; Nieto-Garcia, Edwyna; Barlow, Jay; Gerrodette, Tim; Tregenza, Nicholas; Thomas, Len; Hammond, Philip S. (2016-12-05) - Journal item
    The number of Mexico’s endemic porpoise, the vaquita (Phocoena sinus), is collapsing primarily due to bycatch in illegal gillnets set for totoaba (Totoaba macdonaldi), an endangered fish whose swim bladders are exported ...
  • 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 ...
  • Modeling distribution and abundance of Antarctic baleen whales using ships of opportunity 

    Williams, Robert; Hedley, Sharon L.; Hammond, Philip Steven (2006-06) - Journal article
    Information on animal abundance and distribution is at the cornerstone of many wildlife and conservation strategies. However, these data can be difficult and costly to obtain for cetacean species. The expense of sufficient ...
  • Using hidden Markov models to deal with availability bias on line transect surveys 

    Borchers, David Louis; Zucchini, Walter; Heide-Jørgensen, M.P.; Cañadas, A.; Langrock, Roland (2013) - Journal article
    We develop estimators for line transect surveys of animals that are stochastically unavailable for detection while within detection range. The detection process is formulated as a hidden Markov model with a binary ...