| Back to SMC home page |
DEER MANAGEMENT TASK FORCE
MILBURN TOWNSHIP 2006
REPORT SUMMARY
"Deer are simply heeding the biological imperative to go forth and multiply. With no natural predators, and the suburbs a year-round salad bar, they have slipped out of their ecological niche--and it's our fault, not theirs. The deer did not ask human beings to create the kind of predator-free suburban landscapes in which they now thrive. But the mountain lion, gray wolf and bobcat are not about to return and the houses and highways are staying put. People therefore, must own up to their place in a compromised food chain and assume the responsibility for managing it well."
The New York Times, March 20, 2005
![]() Public Health
|
|
![]() Public Safety
|
|
![]() Forest Health
|
|
"Bull’s-eye" rash does not always appear. Many cases are therefore misdiagnosed and improperly treated. Photos: Oklahoma State Dept Health Facial paralysis resulting from undiagnosed and untreated Lyme disease. Photo: Am. Lyme Disease Foundation Lyme-related arthritis. Photo: US CDC. |
SYMPTOMS OF LYME DISEASE Typical symptoms include fever, headache, fatigue, and a characteristic skin rash called erythema migrans. If left untreated, infection can spread to joints, the heart, and the nervous system. US Centers for Disease Control and Prevention July 28, 2006 Many victims suffer through confusing symptoms, debilitating effects, diagnoses that don’t seem quite right, and the anguish of not knowing why they’re so sick. Division of Public Information and Education, Maine Dept. of Inland Fisheries and Wildlife, 2004
After a few years of strange knee soreness, unexplained heart palpitations, in August of 1993 I had a very bad sore throat, sore left jaw, facial pain, debilitating fatigue, night sweats, fever, swollen glands, vision problems, forgetfulness, cognitive difficulties, violent body twitches and profound dizziness. This lasted many months and progressed into a terrible depression and panic disorder that rendered me unable to work regularly. I felt physically sick, as if I was losing my mind. As a psychologist, I knew that there was no rational explanation for the psychoemotional problems, but thought that the physical difficulties might somehow be connected. Dr. Christopher Montes, Farmington, CT State of Connecticut Public Hearing on Insurance Coverage of Lyme Disease Feb 24 1999 |
|
Deer infected by adult Ixodes scapularis. Each female tick can produce 3,000 eggs. Photo: American Lyme Disease Foundation
Reducing deer results in reduced incidence of Lyme disease. (Mumford Cove, Kilpatrick and LaBonte 2003) Tick larvae and nymphs found on rodents:
Source: Dr. Kirby Stafford, Connecticut Agricultural Experiment Station. "By 2004, no immature I. scapularis could be found on rodents on Monhegan Island." J. Piesman, CDC, May 2006
Tick life cycle Chart: Univ Pennsylvania
Researcher collects (above) and counts tick population (below).
Photos: Yale University School of Public Health "Epidemic Spread of Lyme Borreliosis" CDC April 2006 |
LYME DISEASE/DEER CONNECTION While white-tailed deer are not themselves carriers of Lyme disease, the presence of these large herbivores does lead to a greater abundance of ticks in an area, and these in turn are responsible for transmitting Lyme and other diseases to humans. The direct correlation between deer herd size and Lyme disease has been well documented. In Mumford Cove, a neighborhood in Groton, Connecticut, when the deer population was dramatically reduced, the number of reported cases of Lyme disease directly tracked this reduction and fell from a high of 30 cases to 5 reported cases in just three years (Kilpatrick and LaBonte, 2003). On Great Island in Massachusetts, prior to the removal of all deer, the annual incidence of Lyme was 3 cases per 100 people. After all the deer were removed, the incidence rate dropped to 0.2 cases (Wilson & Childs, 1997). Though mice are usually the principal mammalian carrier of Lyme disease, a high deer population tends to support a higher tick population. Deer also help to distribute ticks over a wide area, and to sites where they are more likely to find human hosts. Deer Research Study Greenwich, CT Howard Kilpatrick October 7, 2004 Dr. Kirby Stafford, the vice director and chief entomologist at the Connecticut Agriculture Experiment Station, explained on June 8, 2006, "There is a direct correlation between the number of deer in an area and the amount of reported cases of Lyme disease."
He cited an example: Monhegan Island, a 586-acre island off the coast of Maine, had more than 100 deer per square mile and by 1996 13% of the residents had contracted Lyme disease. Because of this, the residents voted to completely rid the island of deer and from by August 1999, all the deer were removed.
"By the summer of 2003, no larvae or nymphs were recovered (on Monhegan Island) and very few adult ticks were recovered, and this continues. This shows how fundamental deer are to the abundance of ticks," Stafford said.
Darien Times, June 8, 2006
"Since the deer extirpation was completed, Maine medical researchers have monitored human health and tick incidence on Monhegan Island. After a lag of two to three years, the tick population has crashed and there have been no new human cases of Lyme disease on the island."
Cornell University, 2004
|
|
|
Distribution of new reported Lyme disease cases in US. CDC 2003 Nymphal tick, Ixodes scapularis. Its bite can transmit Lyme disease. Photo: US Food & Drug Administration Ixodes scapularis; nymph, adult, larva Photo: Univ SC School of Medicine Ixodes scapularis mouth parts. Photo: Tick Research Laboratory Univ RI
Tick on blade of grass. Photo: LA County West Disease Control
Each female tick can lay 3,000 eggs. Photo: CDC
|
LYME DISEASE FACTS
Health A to Z, June, 2006
NY Times June 4, 2006
David Weld, Director American Lyme Disease Foundation March, 2006 |
|

Photo: Adam Anik, by permission of The Item of Millburn Short Hills April 20, 2006
|
Photo: Fairfield County Municipal Deer Management Alliance |
CULLING IS AN EFFECTIVE MEANS OF REDUCING DEER VEHICLE COLLISIONS (DVC) Union County, New Jersey Watchung Reservation
1997-98 3 |
|
Photo: Fairfield County Municipal Deer Management Alliance |
River Hills, Wisconsin "Before we started trapping in 1986-'87, we had 76 car kills. And if you've ever seen a car-deer crash, they're very destructive to both parties," Tollaksen said. "Last year we had eight." Tom Tollaksen, Village Manager, River Hills Wisconsin Journal Sentinel Aug 17, 2002
|
|
Photo: Rutgers Cooperative Extension |
Ned Brown Forest Preserve, Illinois "Sharpshooters, rocket netting and drive netting were employed to increase vegetation and to reduce DVC." "Collisions were reduced from 37 per year to 13."
DVC Countermeasure Toolbox University of Wisconsin 2004
|
|
Photo: www. daverichey.com |
Recommendation of North Jersey Transportation Planning Authority 2005 1. Cost benefit studies indicate that 8 foot high exclusionary fencing should be installed on one side of the road if 8 carcasses per year; both sides if 16; both sides combined with wildlife crossing if 24 deer carcasses are recovered per year. 2. Clear underbrush from side of the road in high DVC areas. 3. Textured pavement (to slow traffic) is suitable for localized use in high animal crossing areas. 4. Encourage hunting or herd reduction. 5. Public education. |
|
Photo: Strieter Lite Inc. |
Strategies for Addressing Deer Vehicle Crashes, Wisconsin Dept Transportation 2004, regarding reflectors: "extensive testing has shown these devices have no impact on the number of crashes." 36% (66/180) of all Millburn DVCs occurred in areas where Strieter Lite reflectors were present. 75% of all such DVCs (50/66) occurred with automobile headlights in use. |
|
|
The majority of Millburn’s recorded DVCs (104 of 180) occur in the vicinity of JFK Parkway, adjacent to NJ American Water Preserve lands, and along South Mountain Reservation boundaries where no culling has been practiced. Source Millburn Police Department
|
|
Clear-cut browse line is evidence of deer overpopulation. Photo: Jim Nachel, 2003 |
OVERABUNDANT DEER THREATEN FOREST HEALTH "Deer can change the plant and tree community by over-browsing everything from the ground to about 4 feet up. Not only is the shrub layer destroyed, but tree regeneration becomes impossible when the seedlings have been consumed. Songbirds disappear and the forest is left susceptible to natural disasters, disease, and invasion by non-native plant species." Native Plant Society of NJ, IMPACT OF DEER ON BIODIVERSITY, May 7, 2006 |
|
Hungry deer reaches for higher branches. Photo: Fairfield County Municipal Deer Management Alliance |
"These forest systems in the Highlands of North Jersey and some in Central Jersey are in a state of collapse. This is ecological Ground Zero." Eric Stiles, Vice President for conservation and stewardship of New Jersey Audubon.
"It is our obligation to do something about it, to deal with the deer. White-tailed deer are a threat to our conservation areas." Mike Van Clef, director of science and stewardship, NJ Nature Conservancy Star-Ledger, Monday, March 14, 2005 |
|
This is how a browse line is created. Photo: Fairfield County Municipal Deer Management Alliance |
"For New Jersey's forest ecosystems, the current deer population isn't just an inconvenience - it's a survival issue. Too many deer eat young saplings, leaving our forests with only mature trees and invasive plants. There's no room left for the next generation of trees. " Michele S. Byers, Executive Director New Jersey Conservation Foundation January 23, 2002
|
|
Healthy understory displays seedling trees and a variety of plant life that supports diverse animal populations. |
"Healthy forests and ecosystems provide essential environmental, social and economic benefits to human health and quality of life. Healthy forests play a major role in providing clean, potable water for us all." NJ Audubon Society Forest Health White Paper 2006 Photo: Montgomery County Parks, MD |
|
Understory is absent in South Mountain Reservation forest. Photo: NJ Audubon Society |
"Early successional forest, evidenced by seedling and sapling stands, are lacking in a majority of areas of the Reservation. In addition, within specific areas of the Reservation, the existing trees all appear to be of similar age. This raises concern about forest regeneration."
South Mountain Reservation Assessment and Restoration Plan June 2006 Professional Planning and Engineering, LLC |
|
Photo: New Brunswick Parks, Canada |
"Results show clear evidence of avian species impacts and losses under increasing browsing pressure." "Young fledglings lacking adequate areas close to the nest site face a greater predation risk as they move longer distances seeking cover and food." "Young birds in a heavily browsed forest are doomed." NJ Audubon Society Forest Health White Paper 2006 |
Postscript from Monhegan Island, Maine: "Many Red Spruce and Balsam seedlings are growing and flourishing everywhere now that the deer are gone."
Monhegan Associates, Inc. 2003
| Back to SMC home page |