Trophic Relationships within a Highland Rodent Assemblage from Manu National Park, Cusco, Peru

Sergio Solari

in The Quintessential Naturalist

Published by University of California Press

Published in print July 2007 | ISBN: 9780520098596
Published online March 2012 | e-ISBN: 9780520916159 | DOI:
Trophic Relationships within a Highland Rodent Assemblage from Manu National Park, Cusco, Peru

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This chapter analyzes stomach rodents for five species of sigmodontine rodents from a highland assemblage from Manu National Park, Peru (3400–3500m), including Akodon subfuscus, A. torgues, Oxymycterus paramensis, Phyllotis osilae, and Oligoryzomys sp. It calculates indices of niche breadth and overlap, and assesses interspecific and intraspecific variation with analysis of variance. The chapter observes that consumption of arthropods (adults and larvae) is predominant in the akodontines, comprising 〉60% of their diet by volume. It further observes that Phyllotis osilae had the greatest niche breadth, whereas O. paramensis had the least and the lowest coefficient of variation (arthropod larvae, 18.1%). The chapter notes that niche overlap is higher between species of Akodon (0.98%), and lower between P. osilae and O. paramensis (0.25%). It concludes that the findings confirm that local patterns of resource use depend on resource availability, and that food is rarely a key factor for ecological segregation in these rodent assemblages.

Keywords: sigmodontine rodents; Manu National Park; Peru; Akodon subfuscus; A. torgues; Oxymycterus paramensis; Phyllotis osilae; Oligoryzomys; niche breadth; ecological segregation

Chapter.  6154 words.  Illustrated.

Subjects: Zoology and Animal Sciences

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