| dc.description.abstract | Concern over the vector potential of the Gulf Coast tick, Amblyomma maculatum
Koch, with the pathogen Ehrlichia ruminantium Dumler, causative agent of the disease
heartwater, has increased the need for fundamental knowledge of tick ecology and
behavior, specifically immature tick biology. Texas strain A. maculatum adult male ticks,
known to emit attraction-aggregation-attachment pheromone (AAAP), were used to
artificially simulate immature tick interaction with adults, in forced environments, on
cattle. Artificial areas were grouped by treatment level, which were 1) aggregating,
attached adult males, 2) aggregating attached adult females or 3) an empty area with no
adults, as a control. Immature ticks were noted to be 6 times more likely to be
aggregating in the AAAP treatment area when adult males were present. In the presences
of either adult female ticks or no ticks at all, immature ticks were found to be attaching at
random within the given area were they where permitted to feed. A second correlation of
mortality was noted among immature ticks in the presence of AAAP emitting adult male
ticks. In the permitted area where immature ticks could attach and feed, immature ticks
were twice as likely to have survived to engorgement if adult male ticks were present in
the area as well (53%). There was no difference in the survival rate among immature
ticks if adult females were present or no adults at all, 26% and 21%, respectively. The study demonstrated that a significant attraction existed between immature ticks and
attached adult males emitting AAAP. | en |
