Geographic Variation In Some Reproductive Characteristics Of Diurnal Squirrels
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Geographic Variation In Some Reproductive Characteristics Of Diurnal Squirrels
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Author : Joseph Curtis Moore
language : en
Publisher:
Release Date : 1961
Geographic Variation In Some Reproductive Characteristics Of Diurnal Squirrels written by Joseph Curtis Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Animals categories.
"The discovery is reported of a third line of evidence which separates the large tribe of Oriental tree squirrels Callosciurini from the Holarctic members of the tribe Sciurini and also associates the widely disjunct Bornean tassel-eared squirrel Reithrosciurus with the Holarctic Sciurini. The third line of evidence is the number of pairs of functional mammae, which are four in the Holarctic Sciurini but only two or three in the Callosciurini. Data in the new line of evidence are presented for samples of 34 of the 37 genera of the subfamily Sciurinae of diurnal squirrels. Their significance to the interrelationships of the eight tribes and their constituent subtribes and genera and occasionally lower categories is evaluated. In general the new line of evidence is equivocal or supports the latest classification of the subfamily Sciurinae. It also suggests some minor refinements. For example, within the large Oriental squirrel subgenus Callosciurus a previously unsuspected division of the species is discovered that separates grossly the Malaysian from the Indo-Chinese species. The species of the Indo-Chinese Subregion have two pairs of mammae; those of the Malaysian Subregion, generally three. In addition to being of systematic value in its geographic variation, the number of pairs of functional mammae is shown to vary with latitude. The number of pairs generally decreases from boreal and temperate climates to tropical. Data from the literature on the size of the brood are presented which reveal that it is correlated with a reduction in mammae from temperate to tropical climates. In the tree squirrels as a whole and in the ground squirrels as a whole, there seems to be a strong trend of larger towards smaller broods from the north temperate climates to tropical climates. This trend corresponds with the decrease in the size of the clutch in birds from the north temperate to tropical climates, but in squirrels the trend seems also to be correlated with a meristic morphological difference--the number of pairs of mammae. No clear answer is at hand for an important question concerning evolution: Do the squirrels of the temperate climate with more mammae and larger broods actually produce more young per year? A definite north-to-south increase of broods from one to two broods per year is found in Nearctic ground squirrels. Data from Funambulus pennanti in India and three species of Callosciurus in Malaya hint that the females of tropical species may rear three or four broods in a single year, instead of one or two as do their relatives in more northern latitudes"--P. 29.
Technical Note
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Author :
language : en
Publisher:
Release Date : 1976
Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Rare animals categories.
Alternative Life History Styles Of Animals
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Author : Michael N. Bruton
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Alternative Life History Styles Of Animals written by Michael N. Bruton and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Mammals Of Africa Volume Iii
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Author : Jonathan Kingdon
language : en
Publisher: A&C Black
Release Date : 2014-11-20
Mammals Of Africa Volume Iii written by Jonathan Kingdon and has been published by A&C Black this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-20 with Nature categories.
Mammals of Africa (MoA) is a series of six volumes which describes, in detail, every currently recognized species of African land mammal. This is the first time that such extensive coverage has ever been attempted, and the volumes incorporate the very latest information and detailed discussion of the morphology, distribution, biology and evolution (including reference to fossil and molecular data) of Africa's mammals. With more than 1,160 species and 16-18 orders, Africa has the greatest diversity and abundance of mammals in the world. The reasons for this and the mechanisms behind their evolution are given special attention in the series. Each volume follows the same format, with detailed profiles of every species and higher taxa. The series includes hundreds of colour illustrations and pencil drawings by Jonathan Kingdon highlighting the morphology and behaviour of the species concerned, as well as line drawings of skulls and jaws by Jonathan Kingdon and Meredith Happold. Every species also includes a detailed distribution map. Edited by Jonathan Kingdon, David Happold, Tom Butynski, Mike Hoffmann, Meredith Happold and Jan Kalina, and written by more than 350 authors, all experts in their fields, Mammals of Africa is as comprehensive a compendium of current knowledge as is possible. Extensive references alert readers to more detailed information. Volume III, edited by David Happold, has profiles of 395 species of rodents, comprising the squirrels, dormice, jerboas, blind mole-rats, African root-rats, pouched rats and mice, Swamp Mouse, climbing mice, fat mice, White-tailed Rat, rock mice, voles, Maned Rat, spiny mice, brush-furred mice, gerbils, jirds, taterils, African Forest Mouse, rats and mice, vlei rats, whistling rats, anomalures, springhares, gundis, African mole-rats, porcupines, Noki (Dassie Rat), cane rats and Coypu. The volume concludes with 13 species of hares and rabbits.
Mammals Of Africa
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Author : Jonathan Kingdon
language : en
Publisher: A&C Black
Release Date : 2013-05-23
Mammals Of Africa written by Jonathan Kingdon and has been published by A&C Black this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-05-23 with Nature categories.
Mammals of Africa (MoA) is a series of six volumes which describes, in detail, every currently recognized species of African land mammal. This is the first time that such extensive coverage has ever been attempted, and the volumes incorporate the very latest information and detailed discussion of the morphology, distribution, biology and evolution (including reference to fossil and molecular data) of Africa's mammals. With 1,160 species and 16 orders, Africa has the greatest diversity and abundance of mammals in the world. The reasons for this and the mechanisms behind their evolution are given special attention in the series. Each volume follows the same format, with detailed profiles of every species and higher taxa. The series includes some 660 colour illustrations by Jonathan Kingdon and his many drawings highlight details of morphology and behaviour of the species concerned. Diagrams, schematic details and line drawings of skulls and jaws are by Jonathan Kingdon and Meredith Happold. Every species also includes a detailed distribution map. Extensive references alert readers to more detailed information. Volume I: Introductory Chapters and Afrotheria (352 pages) Volume II: Primates (560 pages) Volume III: Rodents, Hares and Rabbits (784 pages) Volume IV: Hedgehogs, Shrews and Bats (800 pages) Volume V: Carnivores, Pangolins, Equids and Rhinoceroses (560 pages) Volume VI: Pigs, Hippopotamuses, Chevrotain, Giraffes, Deer and Bovids (704 pages)
Wildlife Abstracts
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Author : U.S. Fish and Wildlife Service
language : en
Publisher:
Release Date : 1976
Wildlife Abstracts written by U.S. Fish and Wildlife Service and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Animals categories.
Rodents Of Sub Saharan Africa
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Author : Ara Monadjem
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2015-02-17
Rodents Of Sub Saharan Africa written by Ara Monadjem and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-02-17 with Nature categories.
This comprehensive handbook covers all the rodents occurring in Southern, Central, East and West Africa, south of the Sahara. Genus and species accounts include diagnostic descriptions, systematics and taxonomy, biogeographical environment, fossil species, photographs of skull and mandible, illustrations of molar dentition, photographs of live animals, distribution maps and tables of standard museum measurements.
Asdell S Patterns Of Mammalian Reproduction
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Author : Virginia Douglass Hayssen
language : en
Publisher: Cornell University Press
Release Date : 1993
Asdell S Patterns Of Mammalian Reproduction written by Virginia Douglass Hayssen and has been published by Cornell University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Nature categories.
Since the appearance of the second edition of Sydney A. Asdell's widely used Patterns of Mammalian Reproduction in 1964, the field of reproductive physiology has expanded dramatically. Accordingly, this revision adopts a different structure from previous editions, substituting empirical delineations for physiological interpretations. With the emphases now on a presentation of the published facts of mammalian reproduction, it provides a thorough compilation of what is known about the basic reproductive biology of each of the 4300 mammalian species.To gather information, the authors examined more than 20,000 publications, dating up to 1992. They used primary sources as much as possible, supplementing them with English translations of Russian, Finnish, Chinese, and Japanese journals. The data are presented in taxonomic order. Each familial account summarizes the pattern of reproduction for the family and provides lists of citations arranged by topic of the literature on the endocrinology, reproductive anatomy, and reproductive physiology of the family. Following each account is a tabular listing of species-specific data for neonatal mass and size, weaning mass and size, litter size, age at sexual maturity, estrous cycle length, gestation length, lactation length, number of litters per year, and seasonality of reproduction. For each of these reproductive variables, the range of data gleaned from the literature is given, together with the source of each value listed.Virginia Hayssen is Assistant Professor of Biology at Smith College. Ari Van Tienhoven is Professor of Animal Physiology, Emeritus, at Cornell University. Ans Van Tienhoven assisted in the compilation of data for the book.
Acta Theriologica
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Author :
language : en
Publisher:
Release Date : 1979
Acta Theriologica written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Mammals categories.
Journal Of Mammalogy
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Author :
language : en
Publisher:
Release Date : 1992
Journal Of Mammalogy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Mammals categories.