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Fall 2012 -
Rammie found a cell tower in a most unlikely
place on the Guajira Peninsula in northeastern
Colombia in March and uploaded some data, so we
know where he wintered, but not how he got
there. The white arrows show the most likely
route. We'll find out when he gets home and has
more time to dump data to us. |
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20-22 Sep 2012 -
Rammie (purple R) started migrating a day after
his neighbor, Bridger (salmon B), but had caught
up to him by midday on the 22nd. |
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9-12 June 2012 -
"Rammie" (who nests near Big Ram Island) joined
our flock on 9 June. As of the 11th he was
feeding one youngster. |
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9-12 June 2012 -
[Same text here on Bridger's page] Here are the
points for both Rammie and his neighbor,
Bridger, during the first 3 days after they got
their high-tech backpacks. Note that Rammie was
also out after some pogies. While they agreed
that fishing for menhaden was an option, what is
most striking about this map is how different
their fishing behavior is.
This is why we're tagging adult males. The GPS
transmitters, and especially the new
"cell-tower" transmitters, provide a remarkably
detailed picture of how these birds are using
the environment.
This is just what we have seen when we followed
neighboring Ospreys from the Westport River
colony in years past--just like human
fisherpeople, each Osprey has its favorite
fishing holes.
Rammie is apparently working the herring run on the
headwaters of the East Branch, while Bridger is
hugging the coast.
For the rest of the summer, I'll map both birds
together and put all the maps on
Bridger's page.] |
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OK, Rammie gets his own set
of maps from now. Here's the start of his
travels--476 miles (766 km) in the first 2.5
days of travel.
He's an adult that we haven't followed before, so we
have no idea where he's going. He does, of
course, although he has no idea exactly how he's
going to get there. We know from following other
adults over a series of years that each year's
path can be very different, although they always
end up at the same spot. |
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22 Sep 2012 -
Rammie crossed Chesapeake Bay around 1 PM on the
22nd. I've picked out hourly locations and
connected them to see how the track we would
have seen from a satellite, rather than a
cell-tower based PTT. In this case, we see some
"wiggle" as Rammie's drifting a bit to either
side of the hourly track, suggesting he may be
using thermals.
Because we get our data from text messages (like the
parents of most teenagers), we need to have the
birds close to a tower around midday, when they
transmitters are programmed to dump data. If the
birds are out over the water, or in some remote
location, we may miss several days'
transmissions. The GPS units do keep all the
data, so the next time we hear from the birds,
we'll get all the gaps filled in.
We're currently in the 4th day of cell tower silence.
Both birds are presumably quite a ways south of
where they were on the 22nd. |
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Fall 2012 -
Rammie got to South America flying under our
radar. Somehow he made it all the way to
Venezuela without being near a cell tower around
mid-day, which is when his transmitter is
programmed to text home. The white arrows
indicate the most likely route he took. The one
thing we do know is that he did not follow the
orange line from his last location up in
Virginia down to his wintering grounds in
Venezuela. |
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Winter 2012-13 -
Our data for Rammie's winter activity begins in
early Feb. From that time until he left on 15
March, his core area was a remarkably small 0.25
square miles! Amazingly, it's not even |
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15-17 Mar 2013 -
Here's Rammie's track through northwestern
Venezuela. So what's up with the zig-zagging?
This is a more mountainous part of the country
than it appears on this map. Scroll down...
(I marked the small reservoir where Homer, one
of our Martha's Vineyard juveniles, spent two
winters.) |
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15-17 Mar 2013 -
Here's a rough track of Rammie's movement on the
15th -17th. Looks like he doesn't dodge all the
mountains in his way, but it also looks like
there's no way to avoid them all. |
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