Severely insect-damaged forest

A temporary trap for red squirrels?

Claire A. Zugmeyer, John Koprowski

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Recent insect infestations in the spruce-fir forest in the Pinaleño Mountains of southeastern Arizona provided an opportunity to document response to severe forest disturbance and existence of an ecological trap for an endemic montane isolate, the endangered Mt. Graham red squirrel (Tamiasciurus hudsonicus grahamensis). From September 2003 to December 2005 we assessed habitat selection and home range dynamics, and monitored potential correlates of fitness (body mass, reproduction, survivorship) in red squirrels living in insect-damaged forest, while drawing comparisons to squirrels inhabiting undamaged mixed-conifer forest. Although Mt. Graham red squirrels demonstrate equal-preference for habitat within insect-damaged forests and reproduce as well as individuals in undamaged forest, poor survivorship and reduced potential to reproduce suggest insect-damaged forest may function as an ecological trap. In addition, areas selected within insect-damaged forest had <69% dead trees, suggesting an upper limit to the extent of tree mortality tolerated by red squirrels. Habitat selection and sensitivity to disturbance will influence use of insect-damaged areas by forest-dwelling species. Although insect-damaged forest may retain habitat patches for a few individuals, low survivorship may generate an ecological trap.

Original languageEnglish (US)
Pages (from-to)464-470
Number of pages7
JournalForest Ecology and Management
Volume257
Issue number2
DOIs
StatePublished - Jan 31 2009

Fingerprint

forest insects
squirrels
traps
insect
habitat preferences
survival rate
survivorship
Tamiasciurus hudsonicus
tree mortality
dead wood
mixed forests
Abies
montane forests
habitat selection
coniferous forests
Picea
disturbance
insects
habitat
habitats

Keywords

  • Endangered species
  • Habitat selection
  • Home range
  • Isolation
  • Southeastern Arizona
  • Survival

ASJC Scopus subject areas

  • Forestry
  • Management, Monitoring, Policy and Law
  • Nature and Landscape Conservation

Cite this

Severely insect-damaged forest : A temporary trap for red squirrels? / Zugmeyer, Claire A.; Koprowski, John.

In: Forest Ecology and Management, Vol. 257, No. 2, 31.01.2009, p. 464-470.

Research output: Contribution to journalArticle

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