If you feel as if you’re being
watched while walking at some of Rhode Island’s beaches and wildlife refuges,
you’re not alone. The 40-foot radio telemetry towers constructed at Trustom
Pond, Sachuest Point, Napatree Point and Block Island’s Southeast Light – each
topped with six antennae to enable monitoring in every direction – have
certainly raised their share of questions. Conspiracy theorists might assume
that they are part of a covert government operation to keep track of the
private lives of ordinary Rhode Islanders. But they’re not invading anyone’s
privacy. Not, unless you’re a bird.
The towers are part of a network
that runs from the Canadian Maritimes to North Carolina that allows biologists
to monitor the migratory movements of birds and bats through the region. The
scientists in charge of the Rhode Island towers are especially interested in
the offshore movements of several species of rare birds that live along our coast.
The data they collect is sought by the Bureau of Ocean Energy Management to help
it make appropriate siting decisions about future offshore energy facilities.
But it’s also providing an intriguing look into the lives of our feathered
friends.
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| Pam Loring, right, attaches nanotag to oystercatcher. |
Pamela Loring, who got her start in
ornithology while studying at the University of Rhode Island and is now nearing
completion of her doctorate at UMass, monitors the data collected from 20
towers located between Cape Cod and Long Island. In the last two years, she has
captured more than 200 common and roseate terns, piping plovers and American
oystercatchers and attached tiny “nanotags” to their backs with glue. The tags
consist of a light-weight, digital transmitter that can be detected when the
birds fly within about 20 miles of one of the 250 towers in the United States
and Canada.
Most of the tagged plovers and
oystercatchers have already arrived back in Rhode Island from their wintering
grounds in the South, and the terns should start showing up any day now. So
Loring is looking forward to collecting and analyzing another year of data. She
has already learned some surprising details about the birds.
The terns, for instance, repeatedly
move back and forth between Cape Cod, Buzzards Bay, Rhode Island and Long
Island at all times of the day and night throughout the breeding season,
something that previous aerial and boat-based surveys of bird populations could
not reveal. And because Loring knows where each bird was tagged, she is
discovering that birds from different nesting colonies move through the area in
different ways.
She was also surprised to find that many
piping plovers depart on their southbound migration by flying far offshore
rather than hugging the coast, as most biologists believed. One bird flew straight
south from Cape Cod beginning at 7 o’clock one evening and was detected by a
tower in southern New Jersey eight hours later. The Rhode Island plovers took alternate
routes – some started out heading south between Block Island and Montauk Point
while others traversed Long Island Sound before turning south.
Loring and colleagues from URI and
the U.S. Fish and Wildlife Service will be capturing additional birds this
spring and summer to affix nanotags to them in hopes of collecting even more
data in the future. So piping plovers seeking to keep their travel plans a
secret should probably avoid suspicious scientists for the next couple months.
This article first appeared in The Independent on April 22, 2016.
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