Winter Study

The Setting

Isle Royale is a remote, wilderness island located in Lake Superior. The island is inhabited by a population of wolves and moose. Isle Royale is also the site of the world’s longest continuous study of any predator-prey system in the world. Every winter, we spend 7 weeks at Isle Royale observing the lives of these wolves and moose. Rolf began working on the wolf-moose project in the early 1970s. I began working on the project in the early 1990s, and I record our adventures and discoveries here in Notes from the Field. Every three to four days, a new entry will be posted here with all the latest from Isle Royale.

Much of what we learn about Isle Royale’s wolves and moose is learned while looking out the windows of the “Flagship,” a small plane with room for a pilot and one observer. Don is the project’s pilot. He has been flying with the wolf-moose project for more than 25 years. His piloting skills are unparalleled and critical to our success. This winter, 2013, is the 55th year of Winter Study.

19 Feb – The north wind blew, the temperature plunged to +3F, and we’ve come to realize that, through no fault of our own, we will soon run out of firewood.  It’s not an emergency, but planning to stay any longer would be impudent.  Prudence is required because we can’t leave whenever we want; we...
16 Feb – Morning snow gave way to some clearing in the afternoon.  Rolf and Don counted moose on another ten survey plots.  The wind and snow do not share our interest for getting those plots counted.  The weather makes us nervous about finishing. The West-end Duo and Pip stayed another day at the...
11 Feb – Ten and a half inches of wet, heavy snow fell.  Thirty knot winds blew.    12 Feb – Another day of poor weather.  Rolf and Don flew for just twenty minutes.  The West-end Duo and Pip were still located in the same place they’d been for the past few days – about three miles from the...
Rolf and Don take off from Washington Harbor for an afternoon flight.                     8 Feb –  This morning, the three remaining wolves of Chippewa Harbor Pack left the site where they’d been feeding from the carcass of an old, arthritic cow moose (site A on map below).  They travelled...
5 Feb – Wind and snow blew all morning and into the afternoon, then eased up in the late afternoon.  We took to the skies.  Pip and the West-end Duo had moved from Washington Harbor to Long Point on the south side of Isle Royale, where they were bedded.  Heavily tracked snow and a few ravens...
2 Feb - The morning weather has become invariably repetitious.  But by 1pm, the skies cleared enough to permit a flight.  At 1pm, Isabelle travelled down Washington Harbor, then along the shore of Grace Harbor.  Her travel ban appears to have been lifted.  Given her direction and pace, we wondered...
30 Jan - The wind blew at 20 knots from the north, until it increased to 25 knots, and then 30 knots. 31 Jan - Wind and light snow. 1 Feb - I lie in bed, awake.  It's about 0600.  The weather wasn’t  good this morning - light snow and 20 knot winds.  But it might get better.  Last night, a large...
26 Jan – After the snow and clouds eased a bit, Don and I flew for a couple hours in the afternoon.  Pip and his two companions had left the kill site.  Tracks they’d left in the snow show that they’d traveled north to Washington Harbor.  Later they turned back to the south and headed straight into...
23 Jan – It got as warm as +3F.  Snow and wind all day long.  Went for a ski. 24 Jan –  The temperature dropped to –12F last night.  For this time of year, the lake is quite possibly warmer than it ever has been.  Cold air passing over warm water produces lake-effect snow, as it has every day for...
20 Jan - A cold north wind whipped fine snow across the harbor and through the forest.  That went on all day.  Just a couple hours before nightfall, the wind dropped to below 15 knots.  Snow-soaked clouds still dominated small patches of blue sky.  Conditions were far from great, but they were good...

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