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Plant species selection by free-ranging cattle in southern Bolivian tropical montane forests

Published online by Cambridge University Press:  11 October 2010

Svenja Marquardt
Affiliation:
WSL, Institute for Snow and Avalanche Research (SLF), Davos, Switzerland ETH Zurich, Institute of Plant, Animal and Agroecosystem Sciences, Zurich, Switzerland
Stephan G. Beck
Affiliation:
Herbario Nacional de Bolivia, Universidad Mayor de San Andrés, La Paz, Bolivia
Felix D. Encinas
Affiliation:
Universidad Autónoma Juan Misael Saracho, Tarija, Bolivia
Humberto Alzérreca A.
Affiliation:
Herbario Nacional de Bolivia, Universidad Mayor de San Andrés, La Paz, Bolivia
Michael Kreuzer*
Affiliation:
ETH Zurich, Institute of Plant, Animal and Agroecosystem Sciences, Zurich, Switzerland
Andrea C. Mayer
Affiliation:
ETH Zurich, Institute of Plant, Animal and Agroecosystem Sciences, Zurich, Switzerland
*
1Corresponding author. Email: michael.kreuzer@inw.agrl.ethz.ch

Abstract:

The frequency of selection of functional groups and plant species by free-ranging cattle foraging in a diverse environment and its changes during the dry and the following prehumid seasons were investigated using direct observations and bite counting. The study was conducted at two sites in the Bolivian–Tucuman montane forests in southern Bolivia, by including datasets of a total of 16 animals. Across both study sites and the entire observation period (May to October/November), the cattle were found to select a broad spectrum of plant species from different functional groups. However, just a limited number of species made up a considerable contribution to overall plant selection. The functional group of the graminoids was selected most frequently, but their contribution to plant selection decreased significantly from 63.5% of total bites in May to 15.9% in September/October, in accordance with a decrease in availability. Selection of woody plants (shrubs and tree parts, the latter mainly in the form of leaf litter and fruits) increased with time, reaching its peak at the beginning of the prehumid season, while the herbs showed a curvilinear pattern of selection which was highest in August. Plant species belonging to the functional groups of ferns, climbers and epiphytes were also selected by the cattle, but generally at low relative proportions. Plant selection might be influenced by temporal differences in nutritional quality and availability of the preferred plant species and functional groups. Sampling behaviour seems to be the most likely reason for the inclusion of a broad range of plant species with overall low contribution to plant selection.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2010

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