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Auteur Topic: Nieuwe dolfijn beschreven  (gelezen 268 keer)

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Justin Jansen

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Nieuwe dolfijn beschreven
« Gepost op: augustus 02, 2008, 11:45:36 am »

Al beschreven in 2005, maar nu de eerste opnamen van deze soort;
http://www.guardian.co.uk/environment/vide.../01/raredolphin

Hieronder een uittreksel van de beschrijving van de soort uit 2005.

DESCRIPTION OF A NEW DOLPHIN, THE AUSTRALIAN SNUBFIN DOLPHIN ORCAELLA
HEINSOHNI SP. N. (CETACEA, DELPHINIDAE)
Isabel Beasley, Kelly M. Robertson, Peter Arnold
Marine Mammal Science Volume 21 Issue 3, Pages 365 - 400 July 2005

Comparisons of the Irrawaddy dolphin, Orcaella brevirostris, between
Australian and Asian sites documented geographic differences in height
of dorsal fin, presence or absence of a median dorsal groove in front
of the dorsal fin, and coloration (presence or absence of a dorsal
cape). Analysis of genetic data provided support for two clades within
the Asian samples, the Mekong River samples from Cambodia and southern
Laos, and all other marine and freshwater sites from Thailand, Indonesia,
and the Philippines. The major separation, however, was between sites in
Asia and those from Australia (5.9% of base pair differences, compared
with 1.2% for within Australia and 1.5% for within Asia). Within a
403 base segment of the mtDNA control region, Australian specimens
had 17 diagnostic sites with 16 fixed base pair differences and one
insertion/deletion. Consistent, statistically significant differences in
skull characters of Australian specimens have previously been demonstrated
and are reviewed in this paper. There was a high concordance in character
differences demonstrated between O. brevirostris from all Asian sites
and Australian specimens, especially in the genetic and osteological
characters. Based on the range and concordance of character differences,
we propose that the Australian dolphins be recognized as a new species,
Orcaella heinsohni (suggested common name: Australian snubfin dolphin).


Groet,

Justin Jansen
Gelogd
M.v.g., Justin Jansen

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