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Article
Jeff Laake, Auteur ; Richard J. Guenzel, Auteur ; John L. Bengtson, Auteur ; Peter Boveng, Auteur ; Michael Cameron, Auteur ; M. Bradley Hanson, AuteurAltitude and flight speed affect detection probability and they typically vary during the course of most aerial surveys. We demonstrate how these sources of variation can be accommodated with covariates in a line-transect analysis using data fro[...]
Article
Nathalie J. Hamel, Auteur ; Julia K. Parrish, Auteur ; Jeff Laake, AuteurThe population-level impact of seabird bycatch is difficult to assess because colony-of-origin is often unknown. As an alternative and complementary approach to ship-derived observations, we assessed the relative potential for bycatch of a known[...]
Article
Jeff Laake, Auteur ; Michelle J. Dawson, Auteur ; Jim Hone, AuteurMark-recapture and line-transect sampling procedures both provide estimators for visibility bias in aerial surveys, and have coexisted in the literature for decades. Mark-recapture estimators of abundance tend to be negatively biased in this con[...]
