Comparison of survival patterns of northern and southern genotypes of the North American tick Ixodes scapularis (Acari: Ixodidae) under northern and southern conditions

Particle and Fibre Toxicology

Roger A LeBrun¹  Jean I Tsao²  Isis M Kuczaj²  Genevieve C Pang²  Alexandra Azevedo¹  Eric L Rulison³  Howard S Ginsberg¹ 

[1] Department of Plant Sciences and Entomology, Woodward Hall, University of Rhode Island, Kingston, RI 02881, USA;Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48824, USA;Current address: Caesar Kleberg Wildlife Research Institute, Texas A&M University-Kingsville, Kingsville, TX 78363, USA

关键词: Geographical gradients;    Southern genotypes;    Northern genotypes;    Survival;    Ixodes scapularis;   

Others  :  1181842
DOI  :  10.1186/1756-3305-7-394

 received in 2014-06-12, accepted in 2014-08-19,  发布年份 2014

【 摘 要 】

Background

Several investigators have reported genetic differences between northern and southern populations of Ixodes scapularis in North America, as well as differences in patterns of disease transmission. Ecological and behavioral correlates of these genetic differences, which might have implications for disease transmission, have not been reported. We compared survival of northern with that of southern genotypes under both northern and southern environmental conditions in laboratory trials.

Methods

Subadult I. scapularis from laboratory colonies that originated from adults collected from deer from several sites in the northeastern, north central, and southern U.S. were exposed to controlled conditions in environmental chambers. Northern and southern genotypes were exposed to light:dark and temperature conditions of northern and southern sites with controlled relative humidities, and mortality through time was recorded.

Results

Ticks from different geographical locations differed in survival patterns, with larvae from Wisconsin surviving longer than larvae from Massachusetts, South Carolina or Georgia, when held under the same conditions. In another experiment, larvae from Florida survived longer than larvae from Michigan. Therefore, survival patterns of regional genotypes did not follow a simple north–south gradient. The most consistent result was that larvae from all locations generally survived longer under northern conditions than under southern conditions.

Conclusions

Our results suggest that conditions in southern North America are less hospitable than in the north to populations of I. scapularis. Southern conditions might have resulted in ecological or behavioral adaptations that contribute to the relative rarity of I. scapularis borne diseases, such as Lyme borreliosis, in the southern compared to the northern United States.

【 授权许可】

   
2014 Ginsberg et al.; licensee BioMed Central Ltd.

【 图 表 】

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【 参考文献 】

• [1][CDC] Centers for Disease Control and Prevention: Summary of notifiable diseases - United States, 2010. MMWR Morb Mortal Wkly Rep 2012, 59(53):1-111.
• [2]Dennis DT, Nekomoto TS, Victor JC, Paul WS, Piesman J: Reported distribution of Ixodes scapularis and Ixodes pacificus (Acari: Ixodidae) in the United States. J Med Entomol 1998, 35:628-629.
• [3]Brownstein JS, Holford TR, Fish D: A climate-based model predicts the spatial distribution of the Lyme disease vector Ixodes scapularis in the United States. Environ Health Persp 2003, 111:1152-1157.
• [4]Norris DE, Klompen JSH, Kierans JE, Black WC: Population genetics of Ixodes scapularis (Acari: Ixodidae) based on mitochondrial 16S and 12S genes. J Med Entomol 1996, 33:78-89.
• [5]Rich SM, Caporale DA, Telford SR, Kocher TD, Hartl DL, Spielman A: Distribution of the Ixodes ricinus-like ticks of eastern North America. Proc Natl Acad Sci 1995, 92:6284-6288.
• [6]Chan CTW: Comparative Analysis of Microsatellite and Mitochondrial Genetic Variation in Ixodes Scapularis. Georgia Southern University, Department of Biology; 2012. [MS thesis]
• [7]Qiu W-G, Dykhuizen DE, Acosta MS, Luft BJ: Geographic uniformity of the Lyme disease spirochete (Borrelia burgdorferi) and its shared history with tick vector (Ixodes scapularis) in the northeastern United States. Genetics 2002, 160:833-849.
• [8]Humphrey PT, Caporale DA, Brisson D: Uncoordinated phylogeography of Borrelia burgdorferi and its tick vector, Ixodes scapularis. Evolution 2010, 64:2653-2663.
• [9]Spielman A, Telford SR, Pollack RJ: The Origins and Course of the Present Outbreak of Lyme Disease. In Ecology and Environmental Management of Lyme Disease. Edited by Ginsberg HS. New Brunswick, New Jersey: Rutgers University Press; 1993:83-96.
• [10]Knülle W: Equilibrium humidities and survival of some tick larvae. J Med Entomol 1966, 2:335-338.
• [11]Needham GR, Teel PD: Off-host physiological ecology of ixodid ticks. Annu Rev Entomol 1991, 36:659-681.
• [12]Daniel M, Dusbábek F: Micrometeorological and Microhabitat Factors affecting maintenance and dissemination of Tick-Borne Diseases in the Environment. In Ecological Dynamics of Tick-Borne Zoonoses. Edited by Sonenshine DE, Mather TN. New York: Oxford University Press; 1994:91-138.
• [13]Stafford KC: Survival of immature Ixodes scapularis (Acari: Ixodidae) at different relative humidities. J Med Entomol 1994, 31:310-314.
• [14]Rodgers SE, Zolnik CP, Mather TN: Duration of exposure to suboptimal atmospheric moisture affects nymphal blacklegged tick survival. J Med Entomol 2007, 44:372-375.
• [15]Sonenshine DE: Biology of Ticks. Volume 1. NY: Oxford University Press; 1991.
• [16]Ginsberg HS, Zhioua E: Nymphal survival and habvitat distribution of Ixodes scapularis and Amblyomma americanum ticks (Acari: Ixodidae) on Fire Island, New York, USA. Exp Appl Acarol 1996, 20:533-544.
• [17]Bertrand MR, Wilson ML: Microclimate-dependent survival of unfed adult Ixodes scapularis (Acari: Ixodidae) in nature: life cycle and study design implications. J Med Entomol 1996, 33:619-627.
• [18]Vail SG, Smith G: Air temperature and relative humidity effects on behavioral activity of blacklegged tick (Acari: Ixodidae) nymphs in New Jersey. J Med Entomol 1998, 35:1025-1028.
• [19]Vail SG, Smith G: Vertical movement and posture of blacklegged tick (Acari: Ixodidae) nymphs as a function of temperature and relative humidity in laboratory experiments. J Med Entomol 2002, 39:842-846.
• [20]Winston PW, Bates DH: Saturated solutions for the control of humidity in biological research. Ecology 1960, 41:232-237.
• [21]Siegal S: Nonparametric Statistics for the Behavioral Sciences. NY: McGraw-Hill; 1956.
• [22]Diuk-Wasser MA, Gatewood AG, Cortinas MR, Yaremych-Hamer S, Tsao J, Kitron U, Hickling G, Brownstein JS, Walker E, Piesman J, Fish D: Spatiotemporal patterns of host-seeking Ixodes scapularis nymphs (Acari: Ixodidae) in the United States. J Med Entomol 2006, 43:166-176.
• [23]Diuk-Wasser MA, Hoen AG, Cislo P, Brinkerhoff R, Hamer SA, Rowland M, Cortinas R, Vourc’h G, Melton F, Hickling GJ, Tsao JI, Bunikis J, Barbour AG, Kitron U, Piesman J, Fish D: Human risk of infection with Borrelia burgdorferi, the Lyme disease agent, in eastern United States. Am J Trop Med Hyg 2012, 86:320-327.
• [24]Gatewood AG, Liebman KA, Vourc’h G, Bunikis J, Hamer SA, Cortinas R, Melton F, Cislo P, Kitron U, Tsao J, Barbour AG, Fish D, Diuk-Wasser MA: Climate and tick seasonality are predictors of Borrelia burgdorferi genotype distribution. Appl Environ Microbiol 2009, 75:2476-2483.
• [25]Ostfeld RS, Keesing F: Biodiversity and disease risk: the case of Lyme disease. Conserv Biol 2000, 14:722-728.
• [26]Apperson CS, Levine JF, Evans TL, Braswell A, Heller J: Relative utilization of reptiles and rodents as hosts by immature Ixodes scapularis (Acari: Ixodidae) in the coastal plain of North Carolina, USA. Exp Appl Acarol 1993, 17:719-731.
• [27]Ogden NH, Lindsay LR, Beauchamp Charron GD, Maarouf A, O’Callaghan CJ, Waltner-Toews D, Barker IK: Investigation of relationships between temperature and developmental rates of tick Ixodes scapularis (Acari: Ixodidae) in the laboratory and field. J Med Entomol 2004, 41:622-633.
• [28]Diuk-Wasser MA, Vourc’h G, Cislo P, Hoen AG, Melton F, Hamer SA, Rowland M, Cortinas R, Hickling GJ, Tsao JI, Barbour A, Kitron U, Piesman J, Fish D: Field and climate-based model for predicting the density of host-seeking nymphal Ixodes scapularis, and important vector of tick-borne disease agents in the eastern United States. Global Ecol Biogeogr 2010, 19:504-514.
• [29]Stromdahl EY, Hickling GJ: Beyond Lyme: aetiology of tick-borne human diseases with emphasis on the south-eastern United States. Zoonoses Public Health 2012, 59(Suppl. 2):48-64.
• [30]Brownstein JS, Holford TR, Fish D: Effect of climate change on Lyme disease risk in North America. Ecohealth 2005, 2:38-46.
• [31]Ogden NJ, Radojevic M, Wu X, Duvvuri VR, Leighton PA, Wu J: Estimated effects of projected climate change on the basic reproductive number of the Lyme disease vector Ixodes scapularis. Environ Health Persp 2014, 122:631-638.