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    Relative abundance and diet composition of Chacoan cavies in relation to range condition

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    Author
    Rosati, V. R.
    Bucher, E. H.
    Issue Date
    1995-11-01
    Keywords
    Pediolagus salinicola
    rodents
    indicator species
    savannas
    feces
    diet
    dry environmental conditions
    overgrazing
    range management
    Argentina
    botanical composition
    grazing
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    Citation
    Rosati, V. R., & Bucher, E. H. (1995). Relative abundance and diet composition of Chacoan cavies in relation to range condition. Journal of Range Management, 48(6), 482-486.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644311
    DOI
    10.2307/4003056
    Additional Links
    https://rangelands.org/
    Abstract
    The relative abundance and dietary botanical composition of the Chacoan cavy (Pediolagus salinicola) was studied on sites of very good, good, and poor range condition in the Western Chaco, Argentina. Pellet count data showed that Chacoan cavy densities varied (P<0.001) among these areas. In both seasons, the highest number of pellets was found in the area of poor condition. This area was characterized by an absence of grasses, dense cover of a creeping fern (Selaginella sellowii), thorny shrubs and a scarcity of dicot herbs. In contrast, a decrease (P<0.05) in Chacoan cavy densities was found in the good and very good range condition areas, coincident with the increase of grass and forb cover. Fecal analysis showed that Chacoan cavy diets were greatly influenced by the amount of forage available, which varied according to the condition of the rangeland. Forbs were the main forage class consumed in all range conditions, but the species composition differed among condition classes. For example, several species of dicot forbs were consumed in areas of very good and good range condition, but Selaginella sellowii was the main dietary forb when the range condition was poor. We concluded that range condition affected the relative abundance and diet of Chacoan cavies of Western Chaco, Argentina. High Chacoan cavy density should be considered as an indicator of vegetation depletion caused by other factors rather than a primary cause of savanna degradation.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003056
    Scopus Count
    Collections
    Journal of Range Management, Volume 48, Number 6 (November 1995)

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