Jump to ContentJump to Main Navigation
The Quintessential NaturalistHonoring the Life and Legacy of Oliver P. Pearson$
Users without a subscription are not able to see the full content.

Douglas Kelt and Deborah Kaspin

Print publication date: 2007

Print ISBN-13: 9780520098596

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520098596.001.0001

Show Summary Details
Page of

PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2022. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 05 July 2022

The Octodontidae Revisited

The Octodontidae Revisited

Una Revision De Octodontidae

(p.694) (p.695) The Octodontidae Revisited
The Quintessential Naturalist

Milton H. Gallardo

Ricardo A. Ojeda

Claudio A. González

Carolina A. Ríos

University of California Press

This chapter observes that the monophyletic and depauperate assemblage of South American octodontid rodents has experienced an extensive adaptive radiation from above-ground dwellers to subterranean, saxicolous, and gerbil-like deserticolous life forms. It notes that complex and saltational chromosomal repatterning is a hallmark of octodontid evolution. The chapter further notes that recent molecular evidence links these chromosome dynamics with quantum genome size shifts, and probably with reticulate evolution via introgressive hybridization in the desert dwellers Tympanoctomys barrerae and Pipanacoctomys aureus. It theorizes that genome duplication represents a novel mechanism of evolution in mammals and its adaptive role is reflected in the ability of deserticolous species to colonize the extreme environment of salt flats. The chapter observes that unique to Tympanoctomys is the rigid bundle of hairs behind the upper incisors, which is crucial to efficiently peel saltbrush leaves and probably explains its broader distribution relative to P aureus.

Keywords:   octodontid rodents, adaptive radiation, saltational chromosomal repatterning, octodontid evolution, introgressive hybridization, Tympanoctomys barrerae, Pipanacoctomys aureus, genome duplication, mammals, deserticolous species

California Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs, and if you can't find the answer there, please contact us.