When it comes to field work and education, the Islandwide tick-borne illness reduction initiative has gained a solid foothold this summer, but the documented spread of lone star ticks poses ongoing concern, the Island biologist leading the program said.

“We’re finding them in more places and in the places we’re finding them, we’re finding more of them,” said Richard Johnson, speaking of the relatively new tick species that he said has now advanced inland from the remote perimeters of Aquinnah and Chappaquiddick. More aggressive than other ticks and much less understood in the context of Island ecology, lone star ticks inflict a painful bite and some carry a bacterial illness called spotted fever.

New maps prepared by Martha’s Vineyard Commission cartographer Chris Seidel and released this summer document the spread of deer ticks, dog ticks and lone star ticks. All carry bacterial diseases, including Lyme disease, erlichiosis, babesiosis and tularemia, and pose a major threat to public health on the Vineyard.

Lone star ticks carry spotted fever and are spreading.

Chris Seidel, Martha's Vineyard Commission

Lone star ticks carry spotted fever and are spreading.

Chris Seidel, Martha's Vineyard Commission

Dots on the maps represent 570 tick data collection visits to properties Islandwide made by Mr. Johnson from 2011 to 2017. Larger dots represent a higher average number of ticks found on the parcel after multiple visits.

This is the second year for the tick maps. Ms. Seidel said the maps also now depict areas where no ticks were found.

“There’s definite value in knowing where there’s nothing,” she said.

Low density areas for ticks include Vineyard Haven and Oak Bluffs, where conditions are generally drier, Mr. Johnson said. High density areas include Chappaquiddick, Aquinnah, Chilmark, West Tisbury and Katama. Moisture, shade and leaf litter all provide favorable conditions for ticks.

Dog ticks carry Rocky Mountain spotted fever.

Chris Seidel, Martha's Vineyard Commission

Dog ticks carry Rocky Mountain spotted fever.

Chris Seidel, Martha's Vineyard Commission

Mr. Johnson said he and his two interns have been busy this summer with the meat and potatoes of the program: yard surveys for homeowners. The surveys involve sweeping yards to collect ticks using a simple method, and then advising homeowners about steps to take to reduce or eliminate the presence of ticks in their yards. More than 200 surveys have been done this summer, well up from last year. The surveys are done for a modest donation (the tick-borne illness reduction program runs entirely on donations). Homeowners can sign up online to have a survey done.

Meanwhile, education remains ongoing through community talks at Island libraries and other venues such as annual meetings for homeowner associations.

Mr. Johnson also said administrative changes put in place earlier this year for the program have been a positive. The program now operates under the auspices of Dukes County, although the Permanent Endowment for Martha’s Vineyard still acts as a pass-through for the tax-deductible funds that make up the annual budget of about $60,000. The summer intern program is a first and one Mr. Johnson hopes to continue, if the program can sustain itself.

“We have no money for next year,” he said, noting that the program currently has enough money to run through October. He said he plans to begin fundraising efforts before the end of the summer.

Chappaquiddick is well known for its prime tick habitat. Lone star ticks were first found on this rural island.

Jeanna Shepard

Chappaquiddick is well known for its prime tick habitat. Lone star ticks were first found on this rural island.

Jeanna Shepard

And he plans to redouble efforts in the fall to encourage more deer hunting. Efforts to increase the deer take have seen slow but steady progress through a variety of initiatives in the past two years, including opening up more private land for hunting and a community venison distribution program. A statewide initiative to extend the archery season this year for deer will also help, Mr. Johnson said. Deer are a key factor in the life cycle of ticks since they host the organisms during their reproductive phase. Ticks are arachnids and feed on the blood of mammals, birds and sometimes reptiles.

Looking ahead, Mr. Johnson said he believes a major ecology study will be needed to better understand the life cycle and habitat factors around lone star ticks. He said the work could possibly be done by a graduate or post-graduate student.

“This is not the work we have been doing, but I think it will need to be done in a next phase — probably not by me — and that’s a big step,” the longtime Island biologist said.

Tax deductible donations to the tick-borne illness reduction initiative can be sent to Richard Johnson, 10 Tori Lane, Vineyard Haven, MA 02568. To sign up for a yard survey, visit surveymonkey.com/r/K53GTY3.