Photo provided by Albert Ladd
Without even giving the debate on predator control in Maine a chance take root and accomplish goals, the debate now seems to be shifting toward the moose herd, including winter ticks and the new revelation that Maine has an estimated moose population of 75,000 or more.
Much of the fervor over winter ticks and moose began in early December when Terry Karkos, staff writer for the Sun Journal in Lewiston, Maine, penned an article about two guys who spent time in the woods last spring looking for shed antlers, found a lot of dead moose all covered with winter ticks.
He and a few friends said they found 50 dead moose calves and adult moose this year in the Jackman region while looking for horns and doing some spring fishing…………………
Eighteen people, including Mason, found 142 dead moose across Wildlife Management Districts 2, 4, 7, 8 and 12, which stretch from the Western Foothills to Aroostook County.
Those interviewed for the story attribute the deaths of these moose to winter ticks.
These are definitely not winter kill,” Mason said recently. “Of the typical winter kill animals like moose, it gets sick, it stands in a small area and basically you find 400 moose droppings and a dead moose in the middle of it………………………….
Every single one that I had found and that the other guys had found, the snow was just starting to come off them and they were totally untouched, so it’s obvious it’s not a predator kill,” Hall said. “You could see ticks right on them.
A deer and moose meat processor from Minot told Karkos, “I think we need a winter without any snow and about minus 30 (degrees) for a month and a half, because that’s the only way you’re going to get rid of them.”
That’s sort of the same story that seems to get spread around about winter ticks. There is information available and I think for the most part the Maine Department of Inland Fisheries and Wildlife (MDIFW) biologists and others have done a respectable job getting out information about winter ticks.
In a November 6, 2011 Sun Journal article, once again Terry Karkos gets information from some of MDIFW’s biologists about the winter ticks.
Maine wildlife biologist Chuck Hulsey:
Winter ticks are affected by what the previous winter was,” Hulsey said Friday. “If you have a lot of snow and a lot of cold, that’s not good for the ticks. If you have less snow and more warmth, it’s really good for the ticks.
Maine wildlife biologist Lee Kantar:
In October and November, winter tick larvae climb shrubs and grasses, gather in huge clusters and wait to ambush moose as they walk past, Kantar said.
“When the ticks are on that bush and they sense the heat of the moose walking by, they basically grab a hold and the whole cluster of moose tick gets onto the moose,
There seems to be a bit more information about winter ticks that I haven’t found in any Maine publications that deals more in depth with what happens in the fall when the winter tick larvae are gathering on vegetation waiting for a free ride with a host. In addition to that, while these winter ticks effect all wild ungulates, why pick on the moose so much. And, it is said that the winter ticks don’t actually kill the moose, but rarely, are we looking at an honest assessment of all factors that kill a moose weakened by tens of thousands of blood sucking ticks?
Lee Kantar says that the winter tick is a “huge contributor” to the death of some moose, he also points out that, “it’s not the sole cause”. Even on the MDIFW website, information provided about moose states that, “winter tick and lung worm infestations rarely kill moose”.
This information is supported in existing studies about moose and winter ticks. William M. Samuel and Dwight A. Welch, “Winter Ticks on Moose and Other Ungulates: Factors Influencing Their Population Size” states that winter ticks (dermacentor albipictus) being the cause of death isn’t certain because, “unequivocal evidence is lacking”.
I think therefore it might be honest to conclude that the cause of death in the majority of dead moose being found in the Maine woods that are inundated with ticks, was not the tick alone. There had to have been other factors. We’ll address those in a moment.
First I think it important to better understand what takes place in the fall of the year. We have read statements from biologists and outdoor sportsmen that seem to indicate that Maine needs little snow and very cold temperatures to kill off the ticks. While that may be true it’s not the entire story in the life cycle of these ticks.
Samuel and Welch state that for there to be significant die-offs of winter ticks, you need 6 consecutive days in which the temperature does not exceed 1.4 degrees Fahrenheit. This is not the only way to kill the ticks and/or lessen the severity of ticks on moose.
During the fall months, in Maine’s climate around September and October, the winter tick larvae find their way onto vegetation. They clump together on the ends of small branches etc. These larvae can be found on vegetation just above the ground to quite high up in trees. The larvae wait until a passing, warm-bodied host, in this case a moose, passes by and then they attach themselves to the moose and the ride begins. You can read all the splendid details by reading the studies, etc.
It is during this time of year, September/October, that certain weather events can have a significant effect on how severe the tick season will become. Early cold temperatures, especially those below freezing, will greatly reduce the activity of the larvae, i.e. limiting their effectiveness of attaching themselves to the moose or even migrating up the stems of vegetation.
Early snows can bury the larvae and stiff fall winds will blow the larvae off the vegetation scattering it around and to the ground preventing the larvae from being able to find a host. The studies of Samuel and Welch, as well as others, seem to agree that the weather events of the fall have a greater effect on tick production than hoping for enough snow and cold in winter to kill the ticks. Without a host, the larvae die.
There are other interesting things to be discovered about moose and winter ticks. For example, these winter ticks bother all wild ungulates, i.e. deer, moose, elk, etc., but most scientists will agree that it seems to be the moose that is the most effected. It is assumed that it all has to do with timing.
The aggregation of the larvae on vegetation seems to more closely fall in line with the timing of the moose mating season. During this time, moose are most active, covering greater amounts of territory than normal and male moose travel more than the females and thus explains the observation by some that it seems bull moose are more effected by the winter ticks than cows. I believe this conclusion about bull moose vs. cow moose is based on assumptive reasoning than anything concluded through scientific study.
In the Samuel/Welch study, experiments were conducted and it was determined that moose have an aversion to larvae/tick infested food. Imagine if they didn’t. If moose have an ability to smell or sense the larvae on the vegetation and in their food, it might also help to explain the claims of some and what is obvious on the ground that predators and scavengers won’t touch the dead carcass of a tick infested moose.
Studies have shown us that there can exist tens of thousands of ticks on any one moose and that this number of ticks can certainly put the moose into a weakened state. Moose are already in a weakened state just trying to survive the winters. Compound that with 50,000 ticks and the problems snowball. However, as we have learned, the ticks alone rarely kill a moose but certainly contribute to it.
When the blood sucking begins, the moose spends much of it’s time “grooming”. Studies tell us that moose that are troubled by the biting ticks do not bed down as often nor as long as non infected moose. This of course tires the animal even more.
While studies seem to be lacking on exactly what happens to the composition of the moose’s blood while all these ticks are feasting, it is honest to assume that the more female, blood sucking ticks there are on a moose, factoring also the moose’s body mass, the greater a weakened state is realized due to loss of blood.
All of these factors and more, make the moose more vulnerable to all the other elements that contribute to normal winter kill. In other words, it becomes more difficult to get enough nourishment; loss of blood and reduced winter hair makes the moose more susceptible to hypothermia; spending so much time “grooming” expends valuable energy needed for survival and with all these losses a moose certainly could not ward off attacks and harassment by predators.
This is perhaps where I’ll get ambushed but please consider the facts and possibilities. There is no denying that coyotes/wolves will harass and kill moose, deer and elk during their weakened winter states. Even though it is seen and believed to be accurate that predators and even scavengers will not touch a tick-infested moose carcass, at what point does a pack of hungry wolves/coyotes know their target is tick infested.
Some of us have been made aware through written and video accounts of how these predators take down and kill, often eating alive, their prey. We have also seen videos and photographs that document coyotes and wolves chasing down their prey. How long could a moose, weakened by normal winter strains and tick infestation, last in trying to run away from a predator attack? Not long I’m afraid. Would the moose have survived if the predator wasn’t there? There’s no way of knowing the answer to that question.
Which brings us once again back to the same point about predators. It seems that when all things within our forests are going well, little concern is given to predators and the effects they have on our game animals. When things get skewed, those populations of predators loom large over the forests and can raise some serious cane even to a point of prohibiting the rebuilding of a herd of deer or moose, in this case a herd that might be suffering some from these blasted ticks.
So, what do we do about the ticks? What can we do? In one report a gentleman suggested some kind of spraying program to kill the ticks but I’m not sure how feasible that is or if that’s something we want to pour onto our landscapes. We can’t control the weather but we can control the predators. But, is that the answer either to this exact equation?
In George Smith’s blog post yesterday, he explained that one Dr. Anthony who attended a recent information session on Maine’s moose, suggested that instead of trying to limit hunting permits for moose to protect them due to increased mortality from ticks, that killing more of the moose might be the better solution.
I’ll leave you with some questions. Feel free to chime in below in the comments section with some answers.
1. According to George Smith’s blog post I referenced above, in 2007 the estimated moose population of Maine was 45,000. Now Lee Kantar, Maine’s head deer and moose biologist claims there are 75,000 or more. Are there now too many moose in Maine which is exacerbating the tick problem?
2. If so, do we kill more moose during the moose hunt? Or do we protect more moose?
3. George Smith states that the new moose counts are, “more credible than any previous estimates”. He offers no substantive proof of his claim. Do you think the new counts are more “credible” or accurate than previous and why?
Who would have thought 35 years ago Maine would be asking if the state had too many moose?
Tom Remington
