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The Quintessential NaturalistHonoring the Life and Legacy of Oliver P. Pearson$
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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

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 03 August 2021

The Octodontidae Revisited

The Octodontidae Revisited

Una Revision De Octodontidae

Chapter:
(p.694) (p.695) The Octodontidae Revisited
Source:
The Quintessential Naturalist
Author(s):

Milton H. Gallardo

Ricardo A. Ojeda

Claudio A. González

Carolina A. Ríos

Publisher:
University of California Press
DOI:10.1525/california/9780520098596.003.0019

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

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