Gulf Coast Tick

Amblyomma maculatum

Description

Gulf Coast ticks (Amblyomma maculatum) normally inhabit grassland prairies and the edges of wooded areas where the shade of canopy cover provides optimal micro-climate off-host survival. The range of the Gulf Coast tick is historically described as a region approximately 100-150 miles inland along the Gulf of Mexico and southern Atlantic coast, extending from Texas to South Carolina.

 

Nymph
Adult Male Adult Female Engorged Female

 

Disease Transmission

The Gulf Coast tick is an arthropod of increasing medical and veterinary importance. These ticks transmit the pathogen Rickettsia parkeri to humans, a type of spotted fever. Recent studies report infection rates of greater than 20% in Gulf Coast ticks. Gulf Coast ticks are also responsible for transmitting American canine hepatozoonosis in wild and domestic canines in the US. This species has also been shown to experimentally transmit Ehrlichia ruminantium (also known as heartwater), causal agent of heartwater, a disease fatal to >80% of wild and domestic ruminants.


Biology

A three-host tick, the Gulf Coast tick is an arthropod of veterinary and medical importance throughout its range. Adult ticks attach and concentrate feeding primarily in the ears of their hosts. This clustered feeding habit concentrates tissue damage and can cause "gotch ear" in young calves, a condition that negatively effects their sale value at market. Seasonal activity of Gulf Coast ticks varies among lifestage and population locality.