Snag dynamics and cavity excavation after bark beetle outbreaks in southwestern ponderosa pine forests

Carol L Chambers, Joy Nystrom Mast

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In the United States, ponderosa pine (Pinus ponderosa) forests provide habitat for more cavity-nesting wildlife than any other forest type. In 2002-2005, stresses from drought, changes in the fire regime, and increases in forest density contributed to the largest bark beetle (Ips or Dendroctonus spp.) epidemic ever recorded in Arizona. We identified characteristics that predict snag longevity and use by cavity nesters of bark beetle-killed ponderosa pine. We mapped snags and monitored use by wildlife in sites with bark beetle outbreaks in northern Arizona. We measured snag characteristics 3 9 years after outbreaks and used multimodel inference to predict whether a snag was standing or fallen or contained excavated cavities or not. We used spatial statistical tests to determine snag patterns. Although >99% of beetle-killed snags were standing 3 years after outbreaks, <20% remained standing after 7 years. Snags were clumped when initially measured and in subsequent remeasurements. Snags that remained standing had lower surrounding basal area, larger dbh, and more limbs, were more decayed, and were on west-facing lower slopes. Snags with cavities were larger in diameter, had broken tops before falling, and were in open (mean live tree basal area 17 m2/ha) forest. Our data are indicative of snag dynamics likely to occur in ponderosa pine forests of the southwestern United States, given the occurrence of recent droughts and bark beetle outbreaks.

Original languageEnglish (US)
Pages (from-to)713-723
Number of pages11
JournalForest Science
Volume60
Issue number4
DOIs
StatePublished - Aug 31 2014

Fingerprint

snag
snags
Pinus ponderosa
bark beetles
bark
coniferous forests
beetle
excavation
cavity
basal area
wildlife
drought
Dendroctonus
Ips
Southwestern United States
fire regime
forest habitats
forest types
branches
limb

Keywords

  • Arizona
  • Dendroctonus
  • Drought
  • Ips
  • Pinus ponderosa
  • Spatial statistics
  • Wildlife

ASJC Scopus subject areas

  • Forestry
  • Ecological Modeling
  • Ecology

Cite this

Snag dynamics and cavity excavation after bark beetle outbreaks in southwestern ponderosa pine forests. / Chambers, Carol L; Mast, Joy Nystrom.

In: Forest Science, Vol. 60, No. 4, 31.08.2014, p. 713-723.

Research output: Contribution to journalArticle

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