Summary
The outcome of herbivore-host plant interactions is partly a function of variation within the two populations. We partitioned variance in herbivore growth performance into components attributable to differences between trees, differences between (full-sib) insect broods, and tree x brood interactions. Growth performance of Epirrita larvae feeding on a small (0.25 ha) population of mountain birch was greatly influenced by differences between individual trees. Up to 49% of the variation in insect growth rate was due to tree effects; 5th instar growth rates ranged from 0.38 to 0.56 mg·mg-1·day-1 across a sample of 8 trees. About 25% of the variation in pupal weights and larval periods was due to tree effects; on low quality trees larvae required a longer time to attain lower pupal weights. Differences between trees were also evident in physical and chemical characteristics of the leaves. Insect broods differed in the duration of the larval period (15% of the variance) which led to differences in the pupal weight attained (13% of the variance). However, brood-specific differences in growth rate were modest (6% in the 4th instar) or nonexistent (5th instar). There was no evidence for tree x brood interactions, which refutes the possibility of fine scale adaptation to particular tree phenotypes. Hypotheses to explain the existence of this variability, and to predict its evolutionary and ecological consequences, are advanced.
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Ayres, M.P., Suomela, J. & MacLean, S.F. Growth performance of Epirrita autumnata (Lepidoptera: Geometridae) on mountain birch: trees, broods, and tree x brood interactions. Oecologia 74, 450–457 (1987). https://doi.org/10.1007/BF00378944
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DOI: https://doi.org/10.1007/BF00378944