Abstract:
:The palatability of 14 species of woody plant was assessed for three species of browsing ruminant, namely kudus, impalas and goats. Results show that palatability was most clearly related to leaf contents of condensed tannins. The effect was a threshold one, with all plants containing more than 5% condensed tannins being rejected as food during the wet season period. In contrast palatability was not influenced by concentrations of protein-precipitating polyphenols, and only weakly related to contents of nitrogen, phosphorus, cations, fibre components and other secondary metabolites. Insect herbivory shows a different pattern. These findings support the hypotheses that (i) condensed tannins function to protect plant cell walls against microbial attack; (ii) hydrolyzable tannins function to inactivate the digestive enzymes of insect herbivores. Large mammalian herbivores are influenced by condensed tannins due to their dependance upon microbial fermentation of plant cell walls for part of their energy needs.
journal_name
Oecologiajournal_title
Oecologiaauthors
Cooper SM,Owen-Smith Ndoi
10.1007/BF00378466subject
Has Abstractpub_date
1985-08-01 00:00:00pages
142-146issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00378466journal_volume
67pub_type
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