[MARMAM] New publication: reproductive parameters for common dolphins

Susan Chivers susan.chivers at noaa.gov
Tue Jun 30 14:37:39 PDT 2015

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.


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 at noaa.gov 
<mailto:susan.chivers at 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 at noaa.gov


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