[MARMAM] New publication on anomalous colored Pacific white-sided dolphins

Keiko Sekiguchi ksekiguc at hawaii.edu
Tue May 27 06:38:33 PDT 2014

Dear MARMAM members,


We are pleased to announce a new paper on anomalous colored Pacific
white-sided dolphins in the new book "Dolphins" (2014, ed. by J.B. Samuels,
NOVA Science Publishers, Inc., NY, 252pp.)


Sekiguchi, K., Jefferson, T. A., Iwahara, Y., Yoshioka, M., Mori, K., Ford,
J.K.B., Mitani, Y., and Gorter, U. (2014)

An infrequently-occurring anomalous color pattern on Pacific white-sided
dolphins, Lagenorhynchus obliquidens

p.183-189. In: Dolphins. Ed. by J.B. Samuels, NOVA Science Publishers, Inc.,
NY, 252pp.



Anomalous body coloration often appears on many mammal species. In the case
of cetaceans, coloration patterns may be particularly important and have
functional and adaptive value. However, white animals for many cetacean
species have been sighted world-wide, and also some anomalous color patterns
have been reported. Anomalous, albinistic and leucistic coloration has been
reported for the Pacific white-sided dolphin (Lagenorhynchus obliquidens),
distributed in the cold temperate waters of the North Pacific. One pattern
first reported by Brownell (1965) has been seen infrequently, but 19 more
sighting/capture records are restricted to nearshore regions in the eastern
North Pacific (e.g., southern California, Monterey Bay, off San Francisco,
Washington, and Alaska). We added seven sightings of these anomalous-colored
animals over the wide range of the mid-western and central North Pacific in
different years; five in 1987 and two in 2012. Color patterns for these
animals were very similar, despite occurrence at different times and in
widely separated locations. Although variable animals with this anomalous
coloration, animals had darker thoracic patches often completely bordered
dorsally and laterally by an extensive, white stripe. However, for some
animals this white stripe was distinguished strongly only above the eyes. We
compiled 27 records of this anomalous form, over a wide range in the North
Pacific. The distribution of these records suggests genetic restriction in
the sighting region (i.e. the mid-western to eastern N. Pacific). This type
of anomalous color pattern has not been reported around Japanese coasts.
Hayano et al. (2004) concluded that there are genetically-distinct
populations around Japan. Anomalous animals observed in the mid-western,
central and eastern North Pacific, but not off Japan, appear to support
their conclusion.


Corresponding author: Keiko Sekiguchi, e-mail address: ksekiguc at hawaii.edu



Keiko Sekiguchi



Keiko Sekiguchi, Ph.D.   (Cetacean Biology) 

Research Fellow, the International Christian University, Tokyo, Japan 

E-mail: <ksekiguc at hawaii.edu> 




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