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Climate impacts on blacklegged tick host-seeking behavior.

Max McClure1, Maria A Diuk-Wasser2

  • 1Vagelos College of Physicians & Surgeons, Columbia University, New York City, NY 10032, USA.

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|November 18, 2018
PubMed
Summary
This summary is machine-generated.

Blacklegged tick (Ixodes scapularis) nymphs must time questing behavior for survival and Lyme disease transmission. A new dynamic model shows climate influences nymph fitness, impacting inland migration predictions.

Keywords:
BehaviorClimateDynamic state variableFitnessIxodes scapularisLyme disease vectorOptimal foragingQuesting

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Area of Science:

  • Ecology
  • Epidemiology
  • Mathematical Biology

Background:

  • The blacklegged tick (Ixodes scapularis) is a primary North American vector for Lyme disease.
  • Tick questing behavior is crucial for survival, host-seeking, and pathogen transmission, but also risks desiccation and depletes energy reserves.
  • Understanding questing behavior dynamics is vital for predicting tick population spread and disease risk.

Purpose of the Study:

  • To develop the first dynamic state variable model for tick questing behavior.
  • To investigate the influence of climate on nymphal fitness predictions for Ixodes scapularis.
  • To evaluate the fitness implications of suboptimal questing strategies and environmental uncertainty on hypothesized inland migration patterns.

Main Methods:

  • Development of a dynamic state variable model for tick questing behavior.
  • Incorporation of environmental factors, particularly climate, into the model.
  • Application of model results to assess Ixodes scapularis fitness under various scenarios, including inland migration.

Main Results:

  • The model provides a framework for understanding the trade-offs in tick questing behavior.
  • Climate significantly influences nymphal fitness predictions, affecting survival and molting success.
  • Suboptimal questing strategies under uncertain environmental conditions impact the predicted success of inland migration.

Conclusions:

  • Dynamic modeling is essential for accurately predicting tick behavior and its ecological consequences.
  • Climate change may alter the fitness landscape for Ixodes scapularis, potentially influencing their geographic distribution.
  • This research provides insights into the factors governing tick survival and the spread of tick-borne diseases like Lyme disease.