The seasonal dynamics of leaf resin, nitrogen, and herbivore damage inEriodictyon californicumand their parallels inDiplacus aurantiacus

N.D.Johnson; C.C.Chu; P.R.EhrlichH.A.Mooney

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The seasonal dynamics of leaf resin, nitrogen, and herbivore damage inEriodictyon californicumand their parallels inDiplacus aurantiacus

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The chaparral shrubEriodictyon californicumproduces a flavonoid leaf resin with a chemically similar composition to that previously reported for the sympatric shrubDiplacus aurantiacus. We determined the phenology, resin content, and nitrogen content ofEriodictyonleaves and the leaf area lost to herbivores. Nitrogen content and resin content were both negatively correlated with leaf age at each sampling date, but nitrogen decreased during the growing season while resin increased. The fraction of leaf area lost during the growing season averaged less than 7 and was highest on the oldest leaves. The seasonal pattern of resin production inEriodictyoncorresponds to that inDiplacus, indicating that the similar environments ofEriodyctyonandDiplacushave led to convergent leaf resins. This convergence in these two plants has implications for chemicals of similar function in other chaparral shrubs.

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《oecologia》 |1984年第3期|398-402|共页
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N.D.Johnson; C.C.Chu; P.R.EhrlichH.A.Mooney;
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Stanford University;

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The seasonal dynamics of leaf resin, nitrogen, and herbivore damage inEriodictyon californicumand their parallels inDiplacus aurantiacus

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