What neurological effect does ivermectin have when administered to turtles?

When administered to turtles, ivermectin is known to cause neurologic signs, which is why this option is the correct answer. Ivermectin primarily affects the nervous system by targeting glutamate-gated chloride channels, leading to paralysis and potentially resulting in adverse neurologic effects in non-target species, such as turtles. These neurologic signs can manifest as incoordination, lethargy, and potentially even tremors or seizures, depending on the dose and the individual animal's sensitivity to the drug.

While there may be benefits to other effects in different species or varying contexts, the specific neurological impact of ivermectin on turtles is a critical concern in veterinary practice. It's important for practitioners to recognize that while ivermectin is effective for treating various parasitic infections, its use in certain species—like turtles—needs careful consideration due to these potential harmful effects on their nervous systems. This understanding helps guide appropriate treatment protocols and ensures animal welfare is prioritized.