Abstract:
:We report evidence from controlled experiments that long straight thorns deter herbivory by browsers. Cut branches of three woody species that had their thorns removed suffered significantly greater herbivory by a tethered goat than did paired intact branches. Branches on living Acacia seyal plants that had their thorns removed suffered significantly greater herbivory by a wild population of free-ranging giraffes than did intact branches on the same plants. These differences in herbivory resulted in long term losses of branch length in clipped as opposed to control branches. In addition, branches within reach of giraffes produced longer thorns and a greater density of thorns than did higher branches. These results imply that increased thorn length is an induced defense.
journal_name
Oecologiajournal_title
Oecologiaauthors
Milewski AV,Young TP,Madden Ddoi
10.1007/BF00317391subject
Has Abstractpub_date
1991-03-01 00:00:00pages
70-75issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00317391journal_volume
86pub_type
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