Chromosomes of the tree shrews (Tupaiidae)

Jcuisin

Nadee

et al. 1999

ABSTRACT. Geographical variation was examined morphologically in the common tree shrew (Tupaia glis) in some Indochinese and Malayan regions. Osteometrical examination and principal component analysis elucidated the morphological differences among various populations. The populations from southern and western Thailand were distinguished morphologically from the other populations. Variation in males from south Thailand and Kuala Lumpur suggests that the Isthmus of Kra may have an influence on the variation of skull morphology. However, the Isthmus of Kra was not completely considered as a factor of geographical separation in this species, because we could not confirm the separation in skull size and shape between the localities at least in females. While, the Kanchanaburi population in western Thailand was significantly smaller than the other population in skull size, and constituted the morphologically separable group in our study.-KEY WORDS: common tree shrew, geographical variation, osteometry, principal component analysis.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Geographical Variation of the Skull Morphology of the Common Tree Shrew (Tupaia glis).

Jcuisin

Nadee

et al. 1999

“…The common tree shrew populations have been split into two independent species, Tupaia glis and Tupaia belangeri, in the chromosome analysis and external observations [1,4,9], which have been evaluated in some reviews [3,11]. These results regarded the zoogeographical influence of the Isthmus of Kra as a separating barrier at species level in Tupaia.…”

Section: Discussionmentioning

confidence: 99%

Multivariate Analysis in Skull Osteometry of the Common Tree Shrew from Both Sides of the Isthmus of Kra in Southern Thailand.

Nishiumi

Hayashi

et al. 2000

. The Isthmus of Kra in Southern Thailand consists of a lowland of about 70 km in length. It has been suggested that the Isthmus may sink beneath the sea surface according to the change of level of the sea, and may function as a zoogeographical barrier in land mammals in this region. So, the geographical variation was osteometrically examined in skull of the common tree shrew (Tupaia glis) from the both sides of Isthmus of Kra. The osteometrical examination demonstrated that the skull is larger in southern population than in northern one. In the charts of the principal component analysis, however, the morphological separation between two populations can not be obviously seen in female. While, the results of the discriminant analysis indicated the morphological separation between the two populations. These findings suggest that the zoogeographical barrier of Istmus of Kra may have influence on the osteometrical variation in the common tree shrew, when the Isthmus was covered with sea.-KEY WORDS: common tree shrew, Isthmus of Kra, osteometry, Tupaia belangeri, Tupaia glis.

“…The Isthmus of Kra in South Thailand ( Fig. 1) has been considered as distribution barrier in the two variations [1][2][3][4][5]8] and it has been suggested that the grayish-colored northern type and the reddish-colored southern type are zoogeographically split by the Isthmus of Kra. However, the local distribution of the two variations has not been detailed closer to the Isthmus.…”

mentioning

confidence: 99%

Sympatric Distribution of the Two Morphological Types of the Common Tree Shrew in Hat-Yai Districts(South Thailand).

Hayashi

Rerkamnuaychoke

et al. 2000

ABSTRACT. The two color types (grayish northern and reddish southern types) of the common tree shrew (Tupaia glis and Tupaia belangeri) were co-distributed in Hat-Yai region (South Thailand). Although the Isthmus of Kra in South Thailand has been considered as distribution barrier of the two types, the sympatric distribution of both types was confirmed in southern side of the Isthmus. In the principal component analysis, the skull measurement character from Hat-Yai region could also be separated into the northern and southern groups according to the skin color identification of corresponding individuals. We could generally distinguish the common tree shrew into two types by skull morphology as well as external skin color.