1 SC/59/IA22 ON THE COMPATIBILITY OF RESULTS FROM ADAPT-VPA AND TRANSITION-PHASE-BASED TRENDS IN AGE-AT-MATURITY FOR THE I-STOCK OF ANTARCTIC MINKE WHALES

• Main Authors: Douglas S. Butterworth, Mitsuyo Mori
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Fuller; Antarc*
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.624.503; http://www.iwcoffice.co.uk/_documents/sci_com/SC59docs/sc-59-ia22.pdf

A counter example is provided to show that inferences of incompatibility between population trends from ADAPT-VPA and independently estimated changes in the age-at-sexual-maturity of Antarctic minke whales over the late 1940s to late 1960s are not robust to plausible variants of the ADAPT-VPA assessment (specifically in this case admitting the possibility of a small negative slope in selectivity at larger ages). Final conclusions on this matter should await fuller investigations on the ability to the ADAPT-VPA estimator to reliably estimate the shape of the time-trend in carrying capacity over this period, upon which inferences of compatibility or otherwise are critically dependent.