home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Loon Magic
/
Loon Magic - Wayzata Technology (8011) (1993).iso
/
mac
/
text
/
07northw.b
< prev
next >
Wrap
Text File
|
1993-07-26
|
3KB
|
57 lines
** NORTHWARD BOUND **
Heading North
For loons in particular, the trip north in spring makes a lot of sense.
There are far fewer stresses and dangers on the northern nesting
lakes than on the coastal waters. Disease, pollution and violent
storms are not as devastating in northern Minnesota or Maine as
they are off the Florida coast. In fact, loon mortality on the summer
nesting range is minimal. Of Wisconsin's roughly 3,000 loons, only
five or six dead loons are found each summer.
Recent studies indicate that East coast loons start moving
northward while still on Atlantic coastal waters and gradually work
their way up the coast prior to overland migration to the breeding
areas. While large numbers of loons winter off Florida's Atlantic
coast, these loons leave by the first of April.
While movements of loons on the West coast are not as well
studied, it appears a similar pattern of gradual migration is at work.
Large numbers of loons, mainly Pacific, start leaving southern
California coastal waters in March. Guy McCashie, California editor for
American Birds, talks to birders who see "tens of thousands" of loons
pass some coastal points within a given week in early spring.
Between March and May of 1977, one observer at Goleta Point just
north of Santa Barbara counted 22,768 Pacific loons, 4,355 red-
throated loons and 3,891 common loons in just sixty-eight hours of
observation. This river of loons, which probably winter in Mexican
coastal waters, will not reach their probable Alaskan breeding areas
until late May or early June.
Most lakes in loon country open in mid-to-late April, but in Alaska,
and most of Canada, ice cover on the larger lakes is not unusual
during the first week of May.
In 1950, Sigurd Olson first identified the overland, "drifting
northward," migratory behavior in loons that remains well accepted
today. Common loons do not take off from the Florida coast in March
and fly directly to Ontario, Michigan, Maine or any other nesting
area. As ice recedes, they follow any open water, stopping to fish and
rest, moving slowly northward. How else could loons hit the ice-out
dates so accurately?
Olson also discovered that open lakes in central Minnesota held
loons several weeks prior to the opening of the far northern lakes. In
April and the first week of May, about twenty-five loons were
present on Como Lake, right in the center of St. Paul. By May 6 all
were gone. Centerville Lake, another early opening Minnesota lake
just north of St. Paul, had about 300 loons in late April but none after
May 6. Similar reports have come from other northern states. In
1977, Gary Zimmer, a University of Wisconsin-Stevens Point loon
researcher, observed sixty loons in early spring on the Wisconsin
River, always an early opening river. They stayed for three days
before moving on.
*****