[MARMAM] Possible non-offspring nursing in the southern right whale, Eubalaena australis

Katja Vinding Petersen katjavp at gmail.com
Thu May 21 11:25:23 PDT 2015


Dear MARMAM subscribers,

We would like to draw your attention to our recent publication:

Possible non-offspring nursing in the southern right whale*, Eubalaena
australis *
Peter B. Best; Simon H. Elwen; Per J. Palsboll; Meredith Thornton; Evan
Austin; Katja Vinding
Journal of Mammalogy 2015 96 (2): 405-416
doi: 10.1093/jmammal/gyv042

During the austral winter, adult female southern right whales Eubalaena
australis enter the South African coastal
waters to give birth and raise their young. Most births take place over a
4-month period, when the females
congregate in specific coastal areas or nursery grounds for up to a
recorded maximum of 105 days. At this
time, the density of cow-calf pairs in nursery areas can reach as high as
3.2 pairs/km2 over 26 km of coastline.
Although a single young is born and suckled exclusively for 7 months to a
year, recent observations on nursery
grounds include 3 incidents where apparently abandoned/orphaned
calves-of-the-year have been seen associating
with a minimum of 2-3 different cow-calf pairs over periods of 11-38 days.
Attempts to suckle from these
females have been noted in 2 of the cases, with the response of the female
varying from extreme avoidance to
apparent tolerance. In one instance where the observations of the same trio
extended over 21 days, the nonoffspring
appeared to compete at least equally with the offspring, even though the
mother directed her evasive
tactics more at the non-offspring than her own calf. At the same time, both
of the calves exhibited some growth
in length when compared with the size of the adult female: their subsequent
survival is unknown. Non-offspring
nursing in monotocous species is generally rare, and the costs to the
female potentially high: this is certainly the
case for seasonally feeding mysticetes such as the right whale, where the
costs of lactation cannot be recovered
until the cow resumes feeding about 4 months after parturition. Hence, it
is perhaps not surprising that these are
the first recorded observations of contemporaneous nursing attempts by
offspring and non-offspring calves of
any mysticete.

A copy can be down loaded from:
http://www.bioone.org/doi/abs/10.1093/jmammal/gyv042

Research gate:
https://www.researchgate
.net/publication/275723809_Possible_non-offspring_nursing_in_the_southern_right_whale_
Eubalaena_australis

If you are having problems down loading the article you are welcome to
contact me at katjavp at gmail.com

Enjoy reading about the "Milk thief" as our greatly missed and respected
Peter called it.

Best regards
Katja Vinding
..


-- 
Katja Vinding Petersen, M.Sc.

PhD. Student University of Pretoria, South Africa

Mobile Denmark: 0045 20 62 00 64
Mobile S.A.: +27 (0)7 22 80 11 46
www.facebook.com/WhalesDolphins
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