1999 NORTH AMERICAN REGIONAL STUDBOOK PYGMY MARMOSET (Callithrix pygmaea) Deborah D. Aden Studbook Keeper Denver Zoological Gardens 2900 East 23rd Avenue Denver, CO 30205 TABLE OF CONTENTS INTRODUCTION 1 Classification 1 Scope of Studbook 1 Summary 1 Yellow-Belly and White-Belly Types 1 Population Growth 1 Description of Data Fields 2 Institution List 3 Bibliography 7 BIRTHS, DEATHS, and TRANSFERS DURING 1999 10 LIVING POPULATION BY INSTITUTION AS OF 31 DECEMBER 1998 20 CLASSIFICATION Historically, pygmy marmosets were not considered true marmosets and were classified in their own genera, Cebuella, within the family Callithricidae. They are currently listed with ISIS in the genera Callithrix and for the North American studbook are classified as Callithrix pygmaea. SCOPE OF STUDBOOK The first edition of the full studbook was published in September 1994. Updates have been published yearly. This studbook contains complete records for pygmy marmosets located in the United States and Canada during the calendar year 1999. It also contains a portion of 2000 information as it was made available. SUMMARY Between 1 January 1999 and 31 December 1999 there were 40 births, 44 deaths, and 45 transfers between institutions. As of 31 December 1999 the population was 112.103.18 (233) at 56 institutions. THE YELLOW-BELLY AND WHITE-BELLY TYPES Type 1 or Yellow-belly animals can be distinguished by yellowish chest and belly hair and the males have no black dots on their scrotum. Type 2 or White-belly animals have whitish chest and especially belly hair and males have clearly marked black dots on their scrotum. Generally it is easier to discriminate between type 1 and type 2 males than type 1 and type 2 females. Moreover, variation in fur color between individuals and the existence of hybrids in the population can make identification difficult. The typing information given in this studbook is only a guideline and is based solely on phenotypic evaluations of individuals. The first Population Management Plan for pygmy marmosets was published in January 1998. It was decided to manage the population as a single species since genetic karyotyping would be needed to accurately manage the population as two subspecies. Please see the PMP for more detailed information on this subject. POPULATION GROWTH The New World Primate Tag would like to manage pygmy marmosets in North America at a nucleus population of 100 individuals. This species potentially has a high growth rate in captivity and could be expected to increase quickly. However, the population has remained relatively stable since 1992, increasing only slightly since the original studbook was published. The recently published PMP is managing pygmy marmosets as a stable population and is not trying to decrease their numbers due to their genetic stability and relative popularity of this species. HOW TO OBTAIN: To borrow this document, contact Joanne Brown (brown@primate.wisc.edu), Head of Technical Services, Wisconsin Primate Research Center Library and Information Service, University of Wisconsin-Madison. Fax: 1-608-263-4031
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