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Climatic gradients of arms race coevolution
Hirokazu Toju1, Harue Abe, Saneyoshi Ueno
1Graduate School of Science, Kyoto University, Sakyo, Japan. toju@terra.zool.kyoto-u.ac.jp
The American Naturalist
|April 22, 2011
Summary
A seed-eating weevil and its camellia host exhibit an evolutionary arms race. Female weevils evolved longer snouts to penetrate thicker plant fruit coats, influenced by climate. This coevolutionary dynamic is sensitive to climate change.
Area of Science:
- Evolutionary Biology
- Ecology
- Biodiversity Studies
Background:
- Spatiotemporally dynamic coevolutionary processes are crucial for biodiversity.
- Coevolutionary arms races, like that between seed predators and their hosts, shape species interactions.
Purpose of the Study:
- To investigate the coevolutionary arms race between a seed-eating weevil and its camellia host.
- To understand how climatic gradients influence this interaction and its evolutionary outcomes.
Main Methods:
- Examined weevil snout length and camellia pericarp thickness across Japanese islands with varying climates.
- Assessed the heritability of pericarp thickness.
- Correlated plant defense allocation with temperature and precipitation.
Main Results:
- Female weevils evolved significantly longer snouts than males, especially where camellia pericarps were thicker.
- Camellia pericarp thickness was heritable and evolved to be thicker on islands with weevils.
- Plant defense investment increased with higher annual mean temperature and precipitation.
Conclusions:
- The weevil-camellia interaction demonstrates a clear coevolutionary arms race, with reciprocal adaptations.
- Climate significantly shapes the intensity and geographical variation of this coevolutionary process.
- Global climate change may drastically alter these ecological and evolutionary dynamics.
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