Drought predisposes piñon-juniper woodlands to insect attacks and mortality

Monica L. Gaylord, Thomas E. Kolb, William T. Pockman, Jennifer A. Plaut, Enrico A. Yepez, Alison K. Macalady, Robert E. Pangle, Nate G. Mcdowell

Research output: Contribution to journalArticle

126 Citations (Scopus)

Abstract

To test the hypothesis that drought predisposes trees to insect attacks, we quantified the effects of water availability on insect attacks, tree resistance mechanisms, and mortality of mature piñon pine (Pinus edulis) and one-seed juniper (Juniperus monosperma) using an experimental drought study in New Mexico, USA. The study had four replicated treatments (40 × 40 m plot/replicate): removal of 45% of ambient annual precipitation (H2O-); irrigation to produce 125% of ambient annual precipitation (H2O+); a drought control (C) to quantify the impact of the drought infrastructure; and ambient precipitation (A). Piñon began dying 1 yr after drought initiation, with higher mortality in the H2O- treatment relative to other treatments. Beetles (bark/twig) were present in 92% of dead trees. Resin duct density and area were more strongly affected by treatments and more strongly associated with piñon mortality than direct measurements of resin flow. For juniper, treatments had no effect on insect resistance or attacks, but needle browning was highest in the H2O- treatment. Our results provide strong evidence that ≥ 1 yr of severe drought predisposes piñon to insect attacks and increases mortality, whereas 3 yr of the same drought causes partial canopy loss in juniper.

Original languageEnglish (US)
Pages (from-to)567-578
Number of pages12
JournalNew Phytologist
Volume198
Issue number2
DOIs
StatePublished - Apr 2013

Fingerprint

Juniperus monosperma
Mesons
Juniperus
Droughts
Insects
woodlands
drought
insects
Mortality
Pinus edulis
resin canals
Pinus
Beetles
bark beetles
dead wood
Forests
resistance mechanisms
infrastructure
resins
Needles

Keywords

  • Climate change
  • Drought
  • Host defense
  • Insect resistance
  • Juniper
  • Piñon
  • Resin

ASJC Scopus subject areas

  • Plant Science
  • Physiology

Cite this

Gaylord, M. L., Kolb, T. E., Pockman, W. T., Plaut, J. A., Yepez, E. A., Macalady, A. K., ... Mcdowell, N. G. (2013). Drought predisposes piñon-juniper woodlands to insect attacks and mortality. New Phytologist, 198(2), 567-578. https://doi.org/10.1111/nph.12174

Drought predisposes piñon-juniper woodlands to insect attacks and mortality. / Gaylord, Monica L.; Kolb, Thomas E.; Pockman, William T.; Plaut, Jennifer A.; Yepez, Enrico A.; Macalady, Alison K.; Pangle, Robert E.; Mcdowell, Nate G.

In: New Phytologist, Vol. 198, No. 2, 04.2013, p. 567-578.

Research output: Contribution to journalArticle

Gaylord, ML, Kolb, TE, Pockman, WT, Plaut, JA, Yepez, EA, Macalady, AK, Pangle, RE & Mcdowell, NG 2013, 'Drought predisposes piñon-juniper woodlands to insect attacks and mortality', New Phytologist, vol. 198, no. 2, pp. 567-578. https://doi.org/10.1111/nph.12174
Gaylord, Monica L. ; Kolb, Thomas E. ; Pockman, William T. ; Plaut, Jennifer A. ; Yepez, Enrico A. ; Macalady, Alison K. ; Pangle, Robert E. ; Mcdowell, Nate G. / Drought predisposes piñon-juniper woodlands to insect attacks and mortality. In: New Phytologist. 2013 ; Vol. 198, No. 2. pp. 567-578.
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