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- Title
Responses of leaf beetle larvae to elevated [CO] and temperature depend on Eucalyptus species.
- Authors
Gherlenda, Andrew; Haigh, Anthony; Moore, Ben; Johnson, Scott; Riegler, Markus
- Abstract
It is essential to understand the combined effects of elevated [CO] and temperature on insect herbivores when attempting to forecast climate change responses of diverse ecosystems. Plant species differ in foliar chemistry, and this may result in idiosyncratic plant-mediated responses of insect herbivores at elevated [CO] and temperature. We measured the response of the eucalypt leaf beetle Paropsis atomaria (Coleoptera: Chrysomelidae) feeding on Eucalyptus tereticornis and Eucalyptus robusta. Seedlings were grown at ambient (400 µmol mol) or elevated (640 µmol mol) [CO] and ambient (26/18 °C day/night) or elevated (ambient + 4 °C) temperature in a greenhouse for 7 months. Larvae fed on flush leaves from egg hatch to pupation while being directly exposed to these conditions. Elevated [CO] reduced foliar [N] and [P], while it increased total nonstructural carbohydrates and the C:N ratio. Elevated temperature increased foliar [N] in E. robusta but not E. tereticornis. Plant-mediated effects of elevated [CO] reduced female pupal weight and increased developmental time and leaf consumption. Larval survival at elevated [CO] was impacted differently by the two host plant species; survival increased on E. robusta while it decreased on E. tereticornis. Elevated temperature accelerated larval development but did not impact other insect parameters. We did not detect a CO × temperature interaction, suggesting that elevated temperature as a combined direct and plant-mediated effect may not be able to ameliorate the negative plant-mediated effects of elevated [CO] on insect herbivores. Our study highlighted host-plant-specific responses of insect herbivores to climate change factors that resulted in host-plant-specific survival.
- Subjects
EUCALYPTUS; CHRYSOMELIDAE; CLIMATE change; CARBON monoxide &; the environment; PLANT species; ECOSYSTEM management; HOST plants
- Publication
Oecologia, 2015, Vol 177, Issue 2, p607
- ISSN
0029-8549
- Publication type
Article
- DOI
10.1007/s00442-014-3182-5