Present address: Smithsonian Migratory Bird Center, National Zoological Park, Washington, DC 20008, USA.
Pollen production by Pinus taeda growing in elevated atmospheric CO2
Article first published online: 3 MAY 2006
© 2006 The Authors. Journal compilation © 2006 British Ecological Society
Volume 20, Issue 3, pages 541–547, June 2006
How to Cite
LADEAU, S. L. and CLARK, J. S. (2006), Pollen production by Pinus taeda growing in elevated atmospheric CO2. Functional Ecology, 20: 541–547. doi: 10.1111/j.1365-2435.2006.01133.x
- Issue published online: 9 JUN 2006
- Article first published online: 3 MAY 2006
- Received 6 July 2005; revised 22 November 2005; accepted 23 November 2005Editor: J. Cresswell
- carbon dioxide;
- climate change;
- Pinus taeda;
- reproductive allocation;
- respiratory health;
- 1Rising concentrations of atmospheric CO2 may have important consequences for reproductive allocation in forest trees. Changes in pollen production could influence population dynamics and is likely to have important consequences for human health. This is the first study to evaluate pollen production by forest trees in response to rising atmospheric CO2.
- 2Our research objective was to quantify pollen production by Loblolly Pine (Pinus taeda L.) trees growing in elevated CO2 (ambient + 200 µl l−1) since 1996.
- 3Trees grown in high-CO2 plots first began producing pollen while younger and at smaller sizes relative to ambient-grown trees. Pollen cone and airborne pollen grain abundances were significantly greater in the fumigated stands. We conclude that the greater number of mature trees in high-CO2 plots resulted in greater pollen production at the stand level.
- 4Precocious pollen production has important implications for fertilization and pollen dispersal from young, dense stands. Increasing levels of airborne pollen raise concerns for escalating rates of human respiratory disease.