High Correlation Between Acorn Abundance and Tick Populations

[Guest guest]

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Why Ecologists are Going Nuts Over Preventing Lyme Disease

For people who are concerned about contracting Lyme disease

by Greg Lee

“White tailed deer are the one indispensable piece in the Lyme [disease]

puzzle1â€

Exploding deer populations have been blamed for greater tick

populations and increased incidences of Lyme disease. Deer are believed

to spread infected ticks. Some strategies for reducing infected ticks on

deer include applying pesticides to ticks using deer feeders. Other

strategies employ hunters to reduce deer populations.

Could you reduce new cases of Lyme disease by getting rid of white-tailed deer?

In one study, eliminating deer herds results in decimated tick populations

Ostfeld, Ph.D. Disease Ecologist with the Cary Institute of

Ecosystem Studies gave a stunning presentation on the ecological factors

that affect infected tick populations at a recent conference on Lyme

disease hosted by the National Academy of Sciences Institute of Medicine

Committee. He cited one study on Monhegan Island off the coast of Maine

where hunters were used to reduce a deer herd from a few hundred to

zero. The impact of this hunt had a significant impact on different tick

stages: egg, larvae, nymph, and adult. The larval and nymph tick

populations were reduced to near zero. Aside for humans and their pets,

no other host species live on the island2. Similar studies produced different

results.

In other studies, reducing deer herds did not significantly impact tick

populations

In numerous studies in Connecticut, Massachusetts, New Jersey, and New

York, hunters were used to cull deer herds from large numbers to very

small numbers. Unfortunately, reduced deer herds did result in a

significant reduction of nymph tick populations. Incidence rates of Lyme

disease were not significantly reduced, either. Why are ticks able to

persist despite reduced herds of deer?

Ticks don’t care what animals that they can feed on

The larval and nymph stage of the black legged tick is know to feed on

41 species of mammals, 57 species of birds, and 14 species of lizards.

The adult stage is known to feed on 27 species of mammals and 1 species

of lizard2. Dr. Ostfeld gave several other theories as to why ticks are able to

survive despite lower numbers of deer.

Ticks survive by ganging up on the remaining deer

The remaining deer in these study areas were found to have increased

concentrations of ticks. Another reasons that ticks are able to survive

from year to year is that some animals allow ticks to stay on their

bodies.

Some animals are not good at grooming and killing ticks

In a lab study, approximately 50% of larval ticks were able to

successfully feed off white footed mice. In another study which counted

the number of larval ticks found on wild animals, the average mouse had

about 25 larval ticks, the average gray squirrel had about 150, and the

average opossum had about 250. Fortunately, opossums were found to be

highly effective at grooming and killing attached ticks2. Also, the size of the

forest affects which mammals carry and transmit Lyme disease to ticks.

The size of the forest affects which animals transmit infections to ticks

In other studies, mice and chipmunks were shown to have the highest

transmission rates of infection to ticks. There are specific landscapes

which support increased mice and small rodent populations. In Dutchess

County New York, fragmented landscapes tend to have a greater population

of mice. Dr. Ostfeld estimated that forest fragments less than five to

eight acres in size have a greater risk of infection by 300% – 400%2. What

other critical factor supports a growing tick population?

Ecologists show a high correlation between acorn abundance and tick populations

Dr. Ostfeld reported that the acorn crop of 2010 is estimated to be the

largest one in 20 years in New York and other surrounding areas. Early

indications in land also show an abundant crop. As mice, chipmunks,

and deer increase in numbers with greater acorn production, this leads

to a greater populations of ticks. In 2011, more acorns mean greater

numbers of small rodents that will be carrying greater numbers of

larval-sized ticks. This can lead to a greater risk in 2012.

2012 is predicted to be a dangerous year for getting Lyme disease

The larval sized ticks of 2011 grow into nymph-sized ticks in 2012.

Since nymph ticks are believed to be the major reason for people

contracting Lyme disease, 2012 is predicted to have greater numbers of

hard-to-see infected nymph ticks2. This can result in a much greater risk for

contracting Lyme disease especially in areas of abundant acorn production.

There are many factors which influence the numbers of infected ticks from year

to year

Increased populations of deer are only one of many factors in spreading

Lyme disease. Greater acorn production leads to more rodents and deer.

These rodents end up carrying and infecting more larval ticks. More deer

and other large animals carry and infect tiny nymph-sized ticks that

end up transmitting Lyme disease to humans.

1. Piesman, J. F. 2002. Ecology of

Borrelia burgdorferi sensu lato in North America. In Gray, J. S., O.

Kahl, R. S. Lane, and G. Stanek, editors. (eds.). Lyme

Borreliosis-Biology, Epidemiology, and Control pp. 223–249.CABI

International. Trowbridge, England.

2. Ostfeld. A Systems Approach in Understanding Tick-Borne

Diseases: People, Animals, and the Ecosystem. National Academy of

Sciences, The Institute of Medicine Committee on Lyme Disease and Other

Tick-borne Diseases: The State of Science Conference. October 11-12, 2010,

Washington, DC

Acorn image courtesy of Pearson Foresman of Wikimedia Commons

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