Use of witches' brooms by Abert squirrels in ponderosa pine forests

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Abert squirrels (Sciurus aberti) are ecologically dependent on ponderosa pine forests. Southwestern dwarf mistletoe (Arceuthobium vaginatum) is a common parasite of ponderosa pine (Pinus ponderosa) that can result in the formation of an abnormal growth structure or branching pattern in its host known as a witches' broom. Management of this parasite has generally included intensive removal of infected trees. Previous studies have identified witches' brooms as important for wildlife; however, little is known about the relationship between it and Abert squirrels. We examined the contents of 226 dwarf mistletoe-induced witches' brooms in 144 ponderosa pine trees for evidence of Abert squirrel use between September 2000 and November 2001 and documented use in 39 brooms (31 caching and foraging sites and 8 nest sites). We compared the physical characteristics of brooms with evidence of use to those with no evidence of use to predict the probability of a broom being used as a caching and foraging site by Abert squirrels. As number of branches within a broom and tree height increased so did the probability of Abert squirrel use. We recommend managers retain ponderosa pine trees ≥18 m in height having brooms with >7 branches to provide usable caching and foraging sites for Abert squirrels.

Original languageEnglish (US)
Pages (from-to)467-472
Number of pages6
JournalWildlife Society Bulletin
Volume34
Issue number2
DOIs
StatePublished - Jun 2006

Fingerprint

Pinus ponderosa
squirrels
caching
coniferous forests
Santalales
parasite
foraging
Arceuthobium vaginatum
nest site
witches' broom
parasites
Sciurus
nesting sites
branching
wildlife
managers

Keywords

  • Abert squirrel
  • Arceuthobium vaginatum
  • Arizona
  • dwarf mistletoe
  • Pinus ponderosa
  • Ponderosa pine
  • Sciurus aberti
  • Wildlife habitat
  • Witches' brooms

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology

Cite this

Use of witches' brooms by Abert squirrels in ponderosa pine forests. / Garnett, Gregg N.; Chambers, Carol L; Mathiasen, Robert L.

In: Wildlife Society Bulletin, Vol. 34, No. 2, 06.2006, p. 467-472.

Research output: Contribution to journalArticle

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