Dear Colleagues, My co-authors and I are pleased to announce that the following publication is now available. *Correction factors account for the availability of bowhead whales exposed to seismic operations in the Beaufort Sea. * Robertson, FC, WR Koski, JR Brandon, TA Thomas, and AW Trites (2015). J. Cetacean Res. Manage. 15: 35-44. Abstract The accuracy of estimates of cetacean density from line-transect survey data depends in large part on how visible the target species is to the observer. Behavioural data (i.e. surface and dive times) from government- and industry-funded aerial observation programmes (1980–2000) were used to calculate availability correction factors needed to estimate the number of bowhead whales (*Balaena mysticetus*) from aerial survey sighting data. Correction factors were calculated for bowhead whales exposed and not exposed to seismic operations. Travelling non-calf whales were found to be less likely to be available for detection than other whales, and their availability further declined in the presence of seismic operations. Non-calves were also less available to observers during autumn when exposed to seismic operations than when not exposed, regardless of activity (travelling or otherwise)*. *Such differences in availability appear to reflect behavioural responses to the sound of seismic operations that alters the surfacing and diving patterns of bowhead whales. Localised abundance estimated from aerial surveys may range from 3% to as much as 63% higher in areas ensonified by seismic operations if correction factors are applied to account for differences in availability associated with the presence of seismic operations, compared to abundance estimates derived from assessments that only account for changes in availability of undisturbed whales. These results provide the first empirical estimates of availability for bowhead whales exposed to seismic operations and highlight the implications of not correcting for disturbance-related availability in density assessments in the vicinity of seismic operations. This paper is open source and may be accessed through the following link: http://www.distantfin.net/uploads/6/5/4/8/6548806/rs5745_15_pp35_44_robertso... Please direct any questions to frances.c.robertson@gmail.com Best regards Frances -- Frances C. Robertson, PhD *Marine Mammal Biologist* *~~~~~~~~~~~~~~~~~~~* *Research Scientist SMRU ConsultingElevate Post Doctoral Fellow Simon Fraser University~~~~~~~~~~~~~~~~~~~~~* c: (+1) 360 819 9821 e: frances.c.robertson@gmail.com t: @distantfins www.distantfin.net www.northeastpacificminke.org www.coastalconnectionvancouver.com