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Animation of collared caribou satellite locations
 Caribou herds are
defined by cows that calve together and are close together during the
rut. Satellite collars placed on cows allow us to track the movements
of different caribou herds.
Animating
the sequence of satellite locations from collared cows makes it easier
to see any separation or overlap in the distribution of cows from
different herds.
Watch
animation (9.87 MB) with Windows Media Player
Caribou
collared in March and April have shown that in some years,
cows from more than one herd share the same
winter range. As the cows begin the spring migration to their traditional
calving grounds in May, the herds begin to separate.
This is
clearly shown in the animation sequence where colour coded dots represent
the collared cows based on calving ground fidelity: Bluenose east (red),
Bathurst (green), Ahiak (violet) and Beverly (orange).
Satellite data used to make this animation is received every
5 days, which is the same data used to make the weekly maps posted on our
website. For the months of April, May and June when the cows are moving
more, the animation shows the data received in individual 5-day periods,
allowing the movements to be displayed using a finer time scale. Other
months of the year, when the cows are moving less, the 5-day information is
combined into one monthly display. For these months, you will see an
increase in the number of coloured dots representing the cows because all
the data for the month is displayed at once.
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