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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Variation in the Eucalyptus gunnii-archeri Complex. III. Reciprocal Transplant Trials

BM Potts

Australian Journal of Botany 33(6) 687 - 704
Published: 1985

Abstract

Two multicharacter clines in the more or less continuous stands of Eucalyptus gunnii-archeri on the Central Plateau, Tasmania, are genetically based and appear to parallel independent habitat gradients. Results from experimental gardens established near the extremes of each cline suggest that these clines are at least partly maintained by spatially varying selective forces. Spatial variation in population fitness could be partly attributed to a differential response to drought, frost and insect predation.

Most characters associated with extension growth (e.g. height, internode length, leaf size) exhibited marked phenotypic plasticity. In contrast, several characters of taxonomic importance in the complex, and which vary markedly between populations (e.g. seedling leaf shape, glaucousness), exhibited little environmental modification. The ontogenetic pattern varied between populations and, for many charac- ters, the direction of environmental modification was the same as the direction of genetic differentiation.

https://doi.org/10.1071/BT9850687

© CSIRO 1985

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