Dear Colleagues, We are pleased to announce publication of the following article: Chivers, S. J., W. L. Perryman, M. S. Lynn, T. Gerrodette, F. I. Archer, K. Danil, M. Berman-Kowalewski, and J. P. Dines. 2015. Comparison of reproductive parameters for populations of eastern North Pacific common dolphins: /Delphinus capensis/ and /D. delphis/. Marine Mammal Science DOI: 10.1111/mms.12244. *Abstract* Reproductive parameters were estimated and compared for eastern North Pacific populations of common dolphins using specimen and photogrammetric data. Age and length data for /Delphinus capensis/ and /D. delphis/ specimens recovered as bycatch or strandings were used to estimate the postnatal growth rates needed to estimate age for calves measured in aerial photographs. Bayesian methods propagated uncertainty among models and revealed that the 2009 cohort of calves had birth dates centered on 6 March 2009 for /D. capensis/ and 12 December 2008 for /D. delphis/. The evidence for discrete calving seasons suggests a mechanism of reproductive isolation has evolved between species. Photogrammetric data and Bayesian methods were also used to estimate the average length at which calves swim independently: 145.1 cm (≈ 11.1 mo) in /D. capensis/ and 140.1 cm (≈ 14.0 mo) in /D. delphis/, and the proportion of calves (calves/dolphins counted): 0.045 in /D. capensis/ and 0.069 in /D. delphis/. The latter parameter was converted to an index of calf production (calf/female dolphin) that was >50% lower than pregnancy rates suggesting few births occurred during the study year. Comparisons of regional differences in calf production suggest variability in habitat use patterns within the study area. *http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1748-7692/earlyview <http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291748-7692/earlyview>* You may also contact me at susan.chivers@noaa.gov <mailto:susan.chivers@noaa.gov> for a pdf. Cheers, Susan -- Susan J. Chivers, Ph.D. Marine Mammal and Turtle Division Southwest Fisheries Science Center National Marine Fisheries Service National Oceanic and Atmospheric Administration 8901 La Jolla Shores Dr. La Jolla, CA 92037 USA Phone: 858-546-7093 FAX: 858-546-7003 Email: Susan.Chivers@noaa.gov http://swfsc.noaa.gov/PRD-PhotoLH.aspx