Abstract:
:Mature growth-phase internodes of Alaska paper birch (Betula resinifera) are preferred by the snowshoe hare (Lepus americanus) over juvenile growth-phase internodes due to the low food value of the latter. While the mature over juvenile preferencec cannot be explained by the levels of inorganic nutrients or gross chemical fractions (resins or phenols), it can be explained by the striking differences in secondary metabolites of the two growth phases. The principle compound which renders the juvenile phase internodes unpalatable is papyriferic acid, a triterpene which is a demonstrated feeding deterrent to snowshoe hares and which is present in juvenile internodes at concentrations 25 times greater than those in mature internodes.
journal_name
Oecologiajournal_title
Oecologiaauthors
Reichardt PB,Bryant JP,Clausen TP,Wieland GDdoi
10.1007/BF00384463subject
Has Abstractpub_date
1984-12-01 00:00:00pages
58-69issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00384463journal_volume
65pub_type
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