[MARMAM] Recent Publication: reproductive traits in female bottlenose dolphins of the Southwestern Atlantic Ocean

Pedro Fruet pfruet at gmail.com
Thu Jan 29 10:14:33 PST 2015

Dear all,

We are glad to announce a recent publication in Marine Biology:

Pedro F. Fruet; Rodrigo Cezar Genoves, Luciana M. Möller, Silvina
Botta, Eduardo
R. Secchi (2015) Using mark‑recapture and stranding data to estimate
reproductive traits in female bottlenose dolphins (*Tursiops **truncatus*)
of the Southwestern Atlantic Ocean. Marine Biology. DOI

Despite bottlenose dolphins being well studied in several regions around
the world, there is very limited information about the reproduction of
these animals in the Southwestern Atlantic Ocean (SWA). In this study, data
from a long-term mark-recapture and stranding monitoring program were used
to estimate life history traits of female bottlenose dolphins inhabiting
the Patos Lagoon estuary, a sub-tropical coastal region in the SWA. From
the analysis of 32,296 high-quality dorsal fin photographs, the fate of 37
individual females and 66 of their calves was tracked. Results supported a
birth pulse dolphin community, with most births occurring during late
spring and summer, in association with increasing water temperature and
food supply. Female bottlenose dolphins first reproduced at a minimum age
of 8 years. Mean inter-birth interval was 3 years (mode = 2), and fecundity
was 0.11. A clear change in the δ13C and δ15N profiles in teeth from
stranded carcasses near age 2 indicated the most probable weaning age.
First and second year annual calf survival estimates were 0.84 (95 % CI
0.72–0.90) and 0.86 (95 % CI 0.74– 0.94), respectively. No evidence was
found to support that timing of birth plays a role in calf survival,
suggesting that variability in water temperature and food resources within
the year is unlikely to impact upon survival of calves. Older females
reproduced at lower rates, suggesting an age-related decrease in
reproductive fitness. At an individual level, marked variation in
reproductive success was observed. Our findings highlight the importance of
long-term studies for long-lived mammals to yield individual- and
population-level parameters for demographic and viability analyses that are
useful for conservation and management
The article is fully accessible to all users at libraries and institutions
that have purchased a SpringerLink license.

Alternatively, PDF of the article can be requested by sending an email to
pfruet at gmail.com



Pedro F. Fruet
Universidade Federal do Rio Grande
Museu Oceanográfico
Rio Grande, RS, Brasil.
email:  pfruet at gmail.com <pfruet at gmail.com.br>
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