Western Rattlesnake Picture
Brown et al discuss short distance translocation (SDT) as a possible solution to potentailly dangerous interactions between humans and the western rattlesnake (Crotalus oreganus). They propose that snakes found in an anthropocentric (important for humans) area could be moved a short distance; less than 500 meters from the snakes capture point, ensuring suitable relocation habitat. This technique is not new, and previous studies of SDT effectiveness already exist, but these studies used mark and recapture techniques to determine if the snakes returned to their original points of capture. They yielded varying results, between a 2 and 56% were recaptured in anthropocentric areas within 2 years. To help determine if SDT is an effective way of keeping snake and human interactions to a minimum, Brown et al used radiotelemetry to accurately record snakes positions.
The study was conducted near Osoyoos, BC, and was divided into two regions. The south region bordered a winery, resort, golf course and a campground. The north had no human development contact. Both regions were approximately 235 hectares. In all, 23 male snakes were surgically implanted with a radiotransmitter. Snakes from the north region were used as the control, and not translocated, however they were handled to determine if handling had any effects on the snakes. Snakes from the south region were moved 500 meters from their point of capture, away from human areas. Results showed SDT had no effects on the snakes health. Unfortunately, the radiotelemtry showed 12 of 14 snakes returning to their home territories within and average of 20 days.
The problem with SDT is 500 meters does not take the snake far from its home range, and once released it will wander until it orientates itself with familiar territory. It doesn't take long for the snake to return to it’s original home territory. Brown et al have shown that SDT is not a detrimental procedure to western rattlesnakes, and has some uses. For example, if a music festival was to be held in such an area, SDT of rattlesnakes would ensure both the humans and snakes would be safe for a three day festival period. However, it is only a temporary solution to the problem.
SDT is clearly an ineffecient way of removing snakes in the long term. Adults will find their old territories and soon return. As for long distance translocation, Brown et al cite other papers that find LDT to have adverse health affects on rattlesnakes, so that isn't an option either. I'm curious about middle ground though. Putting a snake in a territory similar enough to its home range, but without chance of wandering back into its original home range. A suggestion from Brown et al was to use SDT on juvenile snakes, before they had a chance to orientate themselves with a territory. Perhaps they would associate the area they were relocated to as their home territory, effectively and safely removing them from human contact. It's a option well worth investigating, both for humans and snakes alike.
Words: 498
Words: 498
