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The Natural History of the Central American Agouti (Dasyprocta Punctata)

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The Natural History of the Central American Agouti (Dasyprocta Punctata) The Natural History of the Central American Agouti (Dasyprocta punctata) ; NICHOLAS SMYTHE SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY • NUMBER 257 SERIES PUBLICATIONS OF THE SMITHSONIAN INSTITUTION Emphasis upon publication as a means of "diffusing knowledge" was expressed by the first Secretary of the Smithsonian. In his formal plan for the Institution, Joseph Henry outlined a program that included the following statement: "It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge." This theme of basic research has been adhered to through the years by thousands of titles issued in series publications under the Smithsonian imprint, commencing with Smithsonian Contributions to Knowledge in 1848 and continuing with the following active series: Smithsonian Contributions to Anthropology Smithsonian Contributions to Astrophysics Smithsonian Contributions to Botany Smithsonian Contributions to the Earth Sciences Smithsonian Contributions to the Marine Sciences Smithsonian Contributions to Pa/eobio/ogy Smithsonian Contributions to Zoology Smithsonian Studies in Air and Space Smithsonian Studies in History and Technology In these series, the Institution publishes small papers and full-scale monographs that report the research and collections of its various museums and bureaux or of professional colleagues in the world cf science and scholarship. The publications are distributed by mailing lists to libraries, universities, and similar institutions throughout the world. Papers or monographs submitted for series publication are received by the Smithsonian Institution Press, subject to its own review for format and style, only through departments of the various Smithsonian museums or bureaux, where the manuscripts are given substantive review. Press requirements for manuscript and art preparation are outlined on the inside back cover. S. Dillon Ripley Secretary Smithsonian Institution SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY* NUMBER 257 The Natural History of the Central American Agouti (Dasyprocta punctata) Nicholas Smythe SMITHSONIAN INSTITUTION PRESS City of Washington 1978 ABSTRACT Smythe, Nicholas. The Natural History of the Central American Agouti (Dasyprocta punctata). Smithsonian Contributions to Zoology, number 257, 52 pages, 25 figures, 2 tables, 1978.—In this report the behavioral ecology of the Central American agouti (Dasyprocta punctata), a large caviomorph rodent, living on Barro Colorado Island in the Panama Canal Zone is described. This two phase study includes social structure, activity patterns, maturation, courting, agonistic and comfort behavior, and acoustic, vocal, visual, and olfactory com- munication systems, as well as the interrelationship of the animals' behavior with the environment. OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. SERIES COVER DESICN: The coral Montastrea cavernosa (Linnaeus). Library of Congress Cataloging in Publication Data Smythe, Nicholas The natural history of the Central American agouti (Dasyprocta punctata) (Smithsonian contributions to zoology ; no. 257) Bibliography: p. Supt. of Docs, no.: SI 1.27:257 1. Central American agouti. 2- Mammals—Panama—Barro Colorado Island- I. Title. II. Series: Smithsonian Institution. Smithsonian contributions to zoology ; no. 257 QL1.S54 no. 257 [QL737.R644] 591'.08s [599\3234] 77-608187 Contents Page Introduction 1 Acknowledgments 3 Materials and Methods 3 Behavioral Ecology 3 The Trap-Mark-Release Program 6 Phase I: Results of Seasonal Changes on Behavior 6 Seasonality of the Food Supply 6 Effects of Seasonal Abundance of Food 7 Seasonal Changes in Aggressive Behavior 10 Phase II: Results of the Trap-Mark-Release Program 11 Species Trapped 11 Numbers and Age Classes 11 Trapping Locations 12 Life History Curves 13 The Ridgetop Traps 18 Adult Males 18 Life Expectancy of Juveniles 19 Mortality Differences between the Sexes 20 The Use of Space 20 Agouti Territories 20 Territories and Nonreproductive Animals 21 Activity Patterns 22 Feeding and Foraging Behavior 23 Types of Food 23 Foraging 24 Feeding Spots 24 Feeding Techniques 25 Scatterhoarding 25 Comfort Behavior 26 Allogrooming 26 Autogrooming 26 Protection against Biting Dipterans 27 Reaction to Rain 27 Sleeping 27 Courtship and Mating Behavior 28 Introductory Behavior of Captives 28 Courtship of Free-living Agoutis 29 Agonistic Behavior 30 Interspecific Agonistic Patterns 30 Intraspecific Agonistic Patterns 30 Maturation of Young Agoutis 32 Parturition and Nest Selection 32 iii SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY Page Maternal Care of Nest-bound Young 33 Breakup of the Mother-Young Bond 36 Role of the Male 37 Survival of the Young 38 Communication and Displays 38 Visual Communication 38 Olfactory Communication 39 Marking with Anal Gland Secretions 39 Urine Marking 40 Mechanical Communication 41 Thumping 41 Derivation and Function of Thumping 42 Drumming with the Forefeet 42 Sounds Made with the Teeth 42 Vocalizations 42 The Alarm Bark 43 Reactions of Conspecifics to Alarm Barks 43 The Purr 44 The Creak-Squeak 44 Fight Grunts 44 Rumble 45 Growl 45 Distress Scream 45 Conclusions 45 Competition and Ecological Separation among Terrestrial Frugivores.. 45 Agoutis and Seed Dispersal 47 The Adaptive Value of Monogamous Pairs 48 Limitations Imposed by the Necessity of Hoarding 49 The Status and Future of the Agouti 49 Literature Cited 51 The Natural History of the Central American Agouti (Dasyprocta punctata) Nicholas Smythe Introduction antelopes (Dubost, 1968; Bourliere, 1973) and to the mouse deer Tragtilus (Morris, 1965). Agoutis Since their appearance in the New World during (Figure 2) are large, cursorial, diurnal, principally the late Eocene, the caviomorph rodents have frugivorous rodents that occur in broadleafed for- undergone an intensive adaptive radiation, so that ests from southern Mexico to northern Argentina. today the group exhibits a diversity that is, in com- Their habit of "scatterhoarding" (Morris, 1962) parison with other groups of mammals at the same food items makes them one of the most important taxonomic level, extraordinary. The taxonomic dispersers of the propagules of their food plants. It affiliations of the agouti (based on Simpson, 1945) appears, in fact, that many of the trees within their are illustrated in Figure 1. natural range have no other regular means of The porcupine (Erethizon dorsatum) is the only dispersal. The importance of the dispersed dis- caviomorph that occurs naturally north of the tribution of Neotropical forest trees, as an adaptive southern part of Mexico, the remainder being con- characteristic, has been discussed by various authors fined to Central and South America, where some (Ridley, 1930; Janzen, 1969, 1970). If the dispersal are small arboreal animals, one almost entirely agents are removed (for example, by indiscriminate fossorial, and two semiaquatic. Some of the larger hunting), then the natural distribution will not be genera appear to occupy ecological niches similar maintained and the character of the forest will to those of various Old World small ungulates. gradually change. Predation upon various parts of Thus, as Kirchshofer (1960a) points out, the mara the trees and the pathogens affecting them will in- (Dolichotis patagonum) bears many resemblances to crease, recruitment will decline, and the species some of the small, plains-dwelling antelopes. In- composition of the community will change. deed, the remarkable running gait known as "stot- Agoutis are an important food source for man ting," which is so characteristic of many ungulates, throughout their range. The meat is not generally also occurs in the mara (Smythe, 1970a). Dubost considered as desirable as that of their nocturnal (1968) considers some of the similarities between relative the paca (Cuniculus paca), but agoutis are cavimorph rodents and West African mammals, commoner and are more easily caught. Firearms and Eisenberg and McKay (1974) discuss con- are not necessary for a successful agouti hunt since, vergences with Asiatic forms. due to the unwillingness of the animals to leave The agouti (Dasyprocta punctata) is similar in their rather small home range, they can be run to many respects to some of the small forest-dwelling ground with dogs and then killed with machetes. For many of the chronically protein-deficient poor Nicholas Smythe, Smithsonian Tropical Research Institute, people within the range of the agouti, it is one of P.O. Box 2072, Balboa, Canal Zone. the most important meats. SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY SUBORDER HYSTRICOMORPHA OLD WORLD HYSTRICOMORPHS NEW WORLD CAVIOMORPHS HISTRICIOAE O.W. Porcupint (4) ECHIMYIDAE Spiny rat (14) ABROCOMIDAE CMnehllla rat (I) ERETHIZONTIDAE N.W. Porcup»n«(4) CTENOMYIDAE Tuco-tuco(l) CAVIIDAE OCTOOONTIDAE Guinea pig. mara (6) Bush rat.viacacha rat 16) HINCHILLIDAE Viscocha. cNnchiloO) Cunteului Stictomv Dn«*procto Mvonroctn FIGURE. 1.—Taxonomic relationships of the suborder Hystriocomorpha (after Simpson, 1945; numbers in parentheses indicate number of genera in each family). In addition to constituting a food for man, agoutis are also important in the diets of several carnivorous animals. They are probably a principal food item for ocelots (Felis pardalis) and jaguar- oundis (Felis yaguaroundi), and an important oc- casional food for jaguars (Panthera onca) and pumas (Felis concolor), as well as tayras (Eira
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