A study of the phyletic relationships among five species of
tragopans and an outgroup, the Blood Pheasant (Ithaginis cruentus), was
conducted from 1987 to 1991. Biochemical, behavioral, and external
morphologic characteristics were compared. A cladistic approach was
used to compare the behavioral, biochemical, and external morphologic
data collectively, as different phyletic relationships were obtained
when each area of investigation was analyzed separately. Although
unlike other pheasant species the genera Tragopan and Ithaginis molt
their tail feathers centrifugally, study results did not indicate that
these two groups were closely related. Based on a compilation of 25
characters, seven possible phylogenetic trees were generated. I
rejected six of the seven trees based on current geographical
distribution, morphology (size and complexity of lappet in males),
behavior (wing coordination during the frontal display of male
tragopans), and electrophoretic (number of unique alleles among the
different species of tragopans) data. I accepted the tree that grouped
Satyr and Western as closely related species and grouped Temminck's,
Blyth's, and Cabot's tragopans together, with Temminck's and Cabot's
being more closely related to each other than either was to Blyth's. I
proposed that the prototype of tragopans probably had their origin in
the eastern Himalayas. There were probably two major dispersal events;
one population dispersed into central and south-east China and the
Himalayas provided a corridor for the dispersal of a second population.
Due to geological events in the Himalayas and China, these populations
further split and eventually evolved into the extant forms. / Graduation date: 1992
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36781 |
| Date | 06 December 1991 |
| Creators | Islam, Kamal |
| Contributors | Crawford, John A. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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