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Author Topic: Origin, Classification and Distribution of White-tailed Deer - Part II  (Read 9553 times)

Offline Big58cal

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This information was taken from White-tailed Deer: Ecology and Management.  It is A Wildlife Management Institute Book, Compiled and Edited by Lowell K. Halls, published by Stackpole Books, copyright 1984 by the Wildlife Management Institute.

Rollin H. Baker, Director Emeritus, The Museum, Professor Emeritus, Department of Fisheries and Wildlife, Department of Zoology, Michigan State University, East Lansing, Michigan

MODERN CERVIDS

     Modern members of the deer family are slim, often long-legged and graceful.  They have the ability to run, leap and skulk to evade enemies.  They possess deciduous antlers, except in the aberrant musk deer and Chinese water-deer (Hydropotes).  Only males have antlers, except in Rangifer, where females are also endowed.  Hormones from the testes, the anterior lobe of the pituitary gland, and the thyroid affect antler development.  The upper canines are long and tusklike only in three genera (in the Subfamilies Moschinae and Cervulinae), being reduced greatly or absent in all others.  The molars are low-crowned (brachyodont) with "half-moon"-shaped cusps (selenodont).  The dental formula of deer is:  incisors, 0/3; canines, 0/1 or 1/1; premolars, 3/3; molars, 3/3; a total of 32 or 34 teeth.  In the skull, the lacrimal and nasal bones are not contiguous.  The cannon bone in each limb is fomed by the fusion of the two principle metapodials of the third and fourth toes.  Lateral toes (remnants of the second and fifth toes) are reduced.  The four-chambered ruminating stomach is a prominent feature of the soft anatomy (interal organs) and important in the digestive process.  The primitive musk deer is the only cervid with a gall bladder.  Tarsal, metatarsal or interdigital glands may be present.  Facial glands occur in all genera except the musk deer.  Males usually are larger than females.  Both sexes may have specific courtship behaviors, and males often maintain harems.  The gestation period is five to eight months.  Young frequently have spotted coats, but adults rarely do.
     Living Cervidae include four subfamiles, 17 genera and approximately 37 species (Ellerman and Morrison-Scott 1951, Cabrera 1961, Coopman 1967).

Family CERVIDAE/Gray 1821:
     Subfamily MOSCHINAE [also arranged as separate Family Moschidae (Webb and Taylor 1980)].
          Genus Moschus/Linnaeus 1758; musk deer (Asian), 1 species
     Subfamily CERVULINAE [= MUNTIACINAE]
          Genus Cervulus/de Blainville 1861 [= Muntiacus/Rafinesque 1815];
               muntjac (Asian), 4 species
          Genus Elaphodus/Milne-Edwards 1871; tufted deer (Asian), 1 species
     Subfamily CERVINAE
          Genus Axis/H. Smith 1827; chital (Asian), 2 species
          Genus Cervus/Linnaeus 1758; North American elk or wapiti, Eurasian red deer, etc.
               (Eurasian, North Africa, North American), approximately 11 species
          Genus Elaphurus/Milne-Edwards 1866; Pere David's deer (formerly Asian now in
               parks and zoos), 1 species
          Genus Dama/Frisch 1775 [validity questioned, see Ellerman and
               Morrison-Scott (1951)]; fallow deer (Eurasian), 1 species
     Subfamily ODOCOILEINAE
          Genus Alces/Gray 1821; moose, European elk (Eurasian, North American), 1 species
          Genus Ozotoceros/Ameghino 1891 [= Blastoceros/Fitzinger 1860];
               swamp deer (South American), 1 species
          Genus Blastocerus/Gray 1850 [= Edocerus/Avila-Pires 1957]; Pampas deer
               (South American); 1 species
          Genus Hippocamelus/Leuckart 1816; huemul (South American), 2 species
          Genus Mazama/Rafinesque 1832; brocket, etc. (Central and South American),
               4 species
          Genus Odocoileus/Rafinesque 1832 [= Dama/Zimmerman 1780]; mule deer,
               white-tailed deer (North and South American), 2 species
          Genus Pudu/Gray 1852; pudu (South American), 2 species
          Genus Rangifer/H. Smith 1827; caribou, reindeer (North American, Eurasian),
               1 species
          Genus Hydropotes/Swinhoe 1870; Chinese water-deer (Asian), 1 species
          Genus Capreolus/Gray 1821; roe deer (Eurasian), 1 species

     The continental distribution of modern cervid genera indicates a high degree of species endemism in Asia (mostly southeastern) and in South America.  Genera in the subfamilies Moschinae, Cervulinae and Cervinae are Eurasian in derivation, with only Cervus in the Cervinae spreading into the New World in the Pleistocene, presumably by way of the Bering Strait land-bridge that once connected the Soviet Union's Chukchi Peninsula with the Seward Peninsula in Alaska.  Genera in the subfamily Odocoileinae, with the exception of Hydropotes and Capreolus, are typical of the Western Hemisphere.  In South America, secondary diversity, probably from Odocoileus as stem stock (Hershkovitz 1982, Simpson 1945), resulted in the development of at least 10 cervid genera (5 Recent).  Alces and Rangifer, two northern genera, presumably made their way to Eurasia by traveling across the Bering land-bridge, perhaps meeting east-traveling Cervus enroute.  Modern mammalogists regard as minor the differences between the pairings: American elk (or "wapiti") and Eurasian red deer; North American moose and Eurasian elk; and caribou and reindeer.  Despite their present separation by the Bering Strait, these relatives are considered to belong to the same species--Cervus elaphus, Alces alces, and Rangifer tarandus respectively.

THE GENUS ODOCOILEUS

     As mentioned previously, the ancestral American Odocoileus seems to have been the progenitor of the several endemic South American deer.  In fact a few authors (see Grzimek 1972) have suggested that some of the Neotropical deer--marsh deer (Ozotocerus), Pampas deer (Blastocerus) and huemal (Hippocamelus)--be placed within the genus Odocoileus.  However, most modern authorities include only white-tailed deer (O. virginianus) and mule and black-tailed deer (O. hemionus.
     Distinctive generic characteristics most commonly used to separate Odocoileus from other New World cervids include: from Rangifer--the absence of antlers in females, the presence of nonpalmate antlers, and a hairless muzzle; from Cervus--the absence of upper canine teeth (except in rare instances), and also of the upper ends of the lateral metacarpals and the vomer dividing the posterior narial cavity; from Alces--the presence of nonpalmate antlers, the absence of a dewlap and also of the vomer dividing the posterior narial cavity; from Pudu--the presence of large antlers and metatarsal, tarsal and pedal glands, and also the naviculo-cuboid of the tarsus being free from the cuneiform; from Ozotoceros, Blastocerus, Hippocamelus and Mazama--the presence of metatarsal glands.
     The white-tailed deer is distinguished from the mule deer by the shape and configuration of the antlers, the length of the sub-basal snag on the antlers, the lengths of the ears and metatarsal glands, the color of the dorsal tail hairs, and the condition of the lacrimal fossa.  Distinguishing between the two species is a problem only where their ranges overlap.

REFERENCES CITED

Anderson, S., and J. K. Jones, Jr., eds. 1967.  Recent mammals of the world, a synopsis of families.  New York: Ronald Press Co. 453 pp.

Avila-Pires, F. D. de. 1975.  Cervidos neotropicales: estado actual y futuro.  Inst. Invest. Cien., Univ. Auton. Nuevo Leom Monterrey, N. L., Mexico.  Publ. Biol. 1(7):155-167.

Bryant, L. D., and C. Maser. 1982.  Classification and distribuion. In Elk of North America: ecology and management, ed. J. W. Thomas and D. E. Toweill, pp. 1-59.  Harrisburg, Pa.: Stackpole Books. 698 pp.

Cabrera, A. 1961. Catalogo de los mamiferos de America del Sur. Rev. Mus. Argent. Cienc. Mat. "Bernardino Rivadavia," Buenos Aires, Cienc. Zool. 4(2):309-732.

Cowan, I. M., and C. W. Holloway. 1973.  Threatened deer of the world: conservation status.  Biol. Conserv. 5(4)243-250.

Ellerman, J. R., and T. C. S. Morrison-Scott. 1951.  Check-list of Palaearctic and Indian mammals, 1758 to 1946.  London: British Museum (Natur. Hist.).  810 pp.

Grzimek. h. c. B. 1972.  Grzimek's animal life encyclopedia. Vol. 13: Mammals IV.  New York: Van Nostrand Reinhold Co. 566 pp.

Halls, L. K. 1978.  White-tailed deer. In Big game of North America: ecology and management, ed. J. L.. Schmidt and L. L. Gilbert, pp. 43-65.  Harrisburg, Pa.: Stackpole Books. 494 pp.

Hershkovitz, P. 1982.  Neotropical deer (Cervidae). Part 1. Pudus, genus Pudu Gray.  Fieldiana Zool., N. S. No. 11. 86 pp.

Koopman, K. F. 1967.  Artiodactyls. In Recent mammals of the world; a synopsis of families, ed. S. Anderson and J. K. Jones, Jr., pp. 385-406.  New York: The Ronald Press Co. 453 pp.

Simpson, G. G. 1945.  The principles of classification and a classification of mammals.  Bull. Amer. Mus. Natur. Hist. Vol. 85. New York: American Museum of Natural History. 350 pp.

Walker, E. P., F. Warnick, S. E. Hamlet, K. I. Lange, M. A. Davis, H. E. Uible, and P. F. Wright. 1975. Mammals of the world. 3rd ed., vol. 2, pp. 647-1,500.  Baltimore: Johns Hopkins Univ. Press.

Webb, S. D., and B. E. Taylor. 1980.  The phylogeny of hornless ruminants and a description of the cranium of Archaeomeryx.  Bull. Amer. Mus. Natur. Hist. 167(3):117-158.

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