Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands.

Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Research Abstract Details 

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Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Abstract Text:

Susan P Elias,Charles B Lubelczyk,Peter W Rand,Eleanor H Lacombe,Mary S Holman,Robert P Smith,

We evaluated the relationships between forest understory structure and the abundance of questing adult and nymphal blacklegged ticks, Ixodes scapularis Say (Acari: Ixodidae), in three Maine towns endemic for Lyme disease, 2001-2003. In fragmented New England woodlands, over-abundant white-tailed deer, Odocoileus virginianus Zimmerman, overbrowse palatable species, allowing browse-resistant exotic-invasive species to replace native forest understory structures. We predicted there would be more ticks in plots dominated by exotic-invasive shrubs (such as Japanese barberry, Berberis thunbergii DC) than in plots dominated by native shrubs, ferns, or open understory. We assessed canopy composition and closure, tree basal area, litter composition, percentage of coverage and stem density of understory species, litter depth, soil moisture, and abundance of small mammals and white-tailed deer pellet groups. We used generalized linear mixed model analysis of covariance to determine the effect of understory structure on tick counts, controlling for continuous habitat and host covariates and adjusting for random spatial effects. There were twice as many adults and nearly twice as many nymphs in plots dominated by exotic-invasives than in plots dominated by native shrubs. Both adult and nymphal counts were lowest in open understory with coniferous litter. Adults were positively associated with increasing litter depth, medium soil moisture, and increasing abundance of white-footed deer mice, Peromyscus leucopus Rafinesque, and deer pellet group counts. Nymphs were positively associated with increasing litter depth, moderately wet soil, and mice. We concluded that deer browse-resistant exotic-invasive understory vegetation presented an elevated risk of human exposure to the vector tick of Lyme disease.

Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Publishing Authors By Initials

SP Elias,CB Lubelczyk,PW Rand,EH Lacombe,MS Holman,RP Smith,

For similar plants: trees research abstracts see: plants: trees research

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Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of medical entomology

VOLUME: 43

Page Numbers: 1142-52

Journal Abbreviation: J. Med. Entomol.

ISSN: 0022-2585

DAY: 3

MONTH: Nov

YEAR: 2006

Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Information

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LANGUAGE: eng

NlmUniqueID: 375400

Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands. Keywords Mesh Terms:

KEYWORDS: Trees

MESH TERMS: physiology

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Grant and Affiliation Information for Deer browse resistant exotic-invasive understory: an indicator of elevated human risk of exposure to Ixodes scapularis (Acari: Ixodidae) in southern coastal Maine woodlands.

AFFILIATION: Maine Medical Center Research Institute, Vector-Borne Disease Research Laboratory, 75 John Roberts Road, Suite 9B, South Portland, ME 04106, USA. susan.elias@maine.edu

Country: United States

AGENCY: United States CDC

GRANT: U50/CCU114672

ACRONYM: CC

MEDLINETA: J Med Entomol

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