October normally finds local
birders, like myself, combing the wooded areas surrounding the old US Naval
Base at Harrisons Point (HP), St. Lucy. This is in search of a bird weighing
less than an ounce but has one of the longest
and most impressive migrations of the animal kingdom. These birds, Blackpoll Warblers(BLPW) (Setophaga striata), take off from their
breeding grounds, in forests of northern North America from Alaska, through
most of Canada, the Great Lakes region and New England, on a journey of up to 1,500 miles over the Atlantic to
their winter grounds in South America. (See
migration map). A study in the 90s done
by McNair,
Massiah and Frost at Harrisons Point discovered that the area around HP
is an important refueling station along the migration route of these birds. On normal occasions you may see one or two
birds but during bad weather the birds on the ground can number into the
hundreds. This is a phenomenon called “fallout”.
It is when adverse atmospheric conditions interrupt migration
forcing birds to the ground. The study
by McNair et al. stated that among other things when the barometric pressure is
low around the BLPOs peek migration
period - between October 15th -25th - that fallout will
occur at HP. Saturday 14th was just that, with a barometric reading
of 1012mb (weatherforyou.com) along with winds
from the SE and persistence rain.
I left home at 5:45am with
my birding buddies, Jason and Sahara (my two children) for the 40 minute drive
to HP in the north. When we arrived, it
was still raining and I drove onto one of the new access roads (that’s another story)
and parked under a large Tamarind Tree (Tamarindus indica) in hope that it
would offer some protection from the rain. They were many birds around especially
seedeaters, like Blackface Grassquits
and Barbados Bullfinches who were
attracted to the seeding Megathrsus
maximus commonly known as Guinea Grass. Shiny
Cowbirds and Carib Grackles were
also busy feeding on the grass seeds. As
I exited the car with an umbrella, I caught sight of my first Blackpoll Warbler
in the Tamarind Tree. It was a strange
one, something I had never seen until then - this bird was still showing its
breeding plumage. I then saw another,
and another and another and by the end of our trip to HP the tally was 15 BLPO
warblers and I knew many more were around but after spending one hour and a half it was time to go.
I am hoping to visit HP
again this coming Saturday. Hopefully the weather is better and the birding is
good.