Relative abundance and survival of the tick<i>Amblyomma americanum</i>collected from sunlit and shaded habitats

Koch, Kristina; Burg, J. G.

doi:10.1111/j.1365-2915.2006.00617.x

Cited by 14 publications

(12 citation statements)

References 24 publications

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“…22 White-tailed deer are the principal host for A. americanum and help maintain the abundance of this tick. 41,42 Moreover, the expansion of white-tailed deer is reported to have considerable influence on the spread of A. americanum -borne diseases, such as ehrlichiosis and southern tick-associated rash illness. 43,44 Higher relative humidity is likely important because moisture retention is necessary for tick survival.…”

Section: Discussionmentioning

confidence: 99%

An Acarologic Survey and Amblyomma americanum Distribution Map with Implications for Tularemia Risk in Missouri

Brown

Yates

Dietrich³

et al. 2011

The American Society of Tropical Medicine and Hygiene

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Abstract. In the United States, tickborne diseases occur focally. Missouri represents a major focus of several tickborne diseases that includes spotted fever rickettsiosis, tularemia, and ehrlichiosis. Our study sought to determine the potential risk of human exposure to human-biting vector ticks in this area. We collected ticks in 79 sites in southern Missouri during June 7-10, 2009, which yielded 1,047 adult and 3,585 nymphal Amblyomma americanum , 5 adult Amblyomma maculatum , 19 adult Dermacentor variabilis , and 5 nymphal Ixodes brunneus . Logistic regression analysis showed that areas posing an elevated risk of exposure to A. americanum nymphs or adults were more likely to be classified as forested than grassland, and the probability of being classified as elevated risk increased with increasing relative humidity during the month of June (30-year average). Overall accuracy of each of the two models was greater than 70% and showed that 20% and 30% of the state were classified as elevated risk for human exposure to nymphs and adults, respectively. We also found a significant positive association between heightened acarologic risk and counties reporting tularemia cases. Our study provides an updated distribution map for A. americanum in Missouri and suggests a wide-spread risk of human exposure to A. americanum and their associated pathogens in this region.

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Section: Discussionmentioning

confidence: 99%

An Acarologic Survey and Amblyomma americanum Distribution Map with Implications for Tularemia Risk in Missouri

Brown

Yates

Dietrich³

et al. 2011

The American Society of Tropical Medicine and Hygiene

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“…A number of studies have assessed associations between A. americanum tick population occurrence and density and environmental predictors (Koch and Burg 2006; Schulze et al. 2001; Willis et al.…”

Section: Introductionmentioning

confidence: 99%

Predicted Northward Expansion of the Geographic Range of the Tick Vector Amblyomma americanum in North America under Future Climate Conditions

Sagurova

Ludwig

Ogden

et al. 2019

Environ Health Perspect

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Background:The geographic range of the tick Amblyomma americanum, a vector of diseases of public health significance such as ehrlichiosis, has expanded from the southeast of the United States northward during the 20th century. Recently, populations of this tick have been reported to be present close to the Canadian border in Michigan and New York states, but established populations are not known in Canada. Previous research suggests that changing temperature patterns with climate change may influence tick life cycles and permit northward range expansion of ticks in the northern hemisphere.Objectives:We aimed to estimate minimal temperature conditions for survival of A. americanum populations at the northern edge of the tick’s range and to investigate the possibility of range expansion of A. americanum into northern U.S. states and southern Canada in the coming decades.Methods:A simulation model of the tick A. americanum was used, via simulations using climate data from meteorological stations in the United States and Canada, to estimate minimal temperature conditions for survival of A. americanum populations at the northern edge of the tick’s range.Results:The predicted geographic scope of temperature suitability [≥3,285 annual cumulative degree days (DD) >0°C] included most of the central and eastern U.S. states east of longitude 110°W, which is consistent with current surveillance data for the presence of the tick in this region, as well as parts of southern Quebec and Ontario in Canada. Regional climate model output raises the possibility of northward range expansion into all provinces of Canada from Alberta to Newfoundland and Labrador during the coming decades, with the greatest northward range expansion (up to 1,000km by the year 2100) occurring under the greenhouse gas (GHG) emissions of Representative Concentration Pathway (RCP) 8.5. Predicted northward range expansion was reduced by approximately half under the reduced GHG emissions of RCP4.5.Discussion:Our results raise the possibility of range expansion of A. americanum into northern U.S. states and southern Canada in the coming decades, and conclude that surveillance for this tick, and the diseases it transmits, would be prudent. https://doi.org/10.1289/EHP5668

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“…Increased temperature and decreased humidity can decrease reproductive efficiency and molting success (Davidson et al 1994). At humidity levels below 85%, ticks ( A. americanum and I. scapularis ) are restricted to microhabitats where humidity is higher (Adler et al 1992, Koch and Burg 2006), although A. americanum is less sensitive than Ixodes species (Adler et al 1992, Schulze et al 2002). Following a prescribed fire, Davidson et al (1994) found a population decline the year after a burn likely due to reduced leaf litter, which alters the microhabitats used by all life stages of ticks.…”

Section: Introductionmentioning

confidence: 99%

Relationship between habitat type, fire frequency, andAmblyomma americanumpopulations in east-central Alabama

Willis

Robert

Murdock

et al. 2012

Journal of Vector Ecology

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Ticks were collected from 20 sites in the Calhoun, Cherokee, and Cleburne Counties in east-central Alabama areas to determine the relationship between plant physiognomy, environmental variables, and tick populations. Sites investigated included various burning regimes, wildland-urban-interface (WUI), a college campus, and an unmanaged area. Amblyomma americanum (L.) (Acari: Ixodidae) dominated the tick population while Ixodes scapularis Say was not encountered. There were complex differences in tick populations among site conditions. After prescribed burning, the tick population size was small but was larger in subsequent 2-and 5-year post-burn sites. An increase in Odocoileus virginianus foraging in recently burned sites is likely responsible for this phenomenon. WUI areas had the largest tick populations likely due to Odocoileus virginianus activity in an area that provides cover, forage, and a connection to a wildlife refuge. It is possible that the likelihood of humans coming in contact with ticks and tick-borne diseases is greater in WUI areas than in unbroken contiguous forest. A. americanum showed a positive correlation with percent cover of grass and leaf litter mass and a negative relationship with pine sapling density. Variables expected to be strongly correlated with A. americanum populations such as soil moisture, canopy closure, and tree density were found to have weak correlations. Journal of Vector Ecology 37 (2): 373-381. 2012.

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Relative abundance and survival of the tickAmblyomma americanumcollected from sunlit and shaded habitats

Cited by 14 publications

References 24 publications

An Acarologic Survey and Amblyomma americanum Distribution Map with Implications for Tularemia Risk in Missouri

An Acarologic Survey and Amblyomma americanum Distribution Map with Implications for Tularemia Risk in Missouri

Predicted Northward Expansion of the Geographic Range of the Tick Vector Amblyomma americanum in North America under Future Climate Conditions

Relationship between habitat type, fire frequency, andAmblyomma americanumpopulations in east-central Alabama

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