Friday, August 14, 2015

Some Bears View the Friendly Skies

Environmental & Science Education
Edward Hessler

Black bear2
By dalliedee (
[CC BY 2.0 (],
via Wikimedia Commons
On August 13, I heard an interview by Dan Gunderson (Minnesota Public Radio) with bear researcher Mark Ditmer. Ditmer has been tracking radio-collared bears for years in northwest Minnesota. He has found no evidence that the bears have been bothered by it (based on heart-rate data).

However, when Ditmer used drones to monitor bear behavior (video camera), the bears showed  noticeable changes. Their heart rates spiked dropping only when the drones left the area. The heart rate of one bear, a mother with cubs, went from 41 heartbeats/minute to 162 heartbeats/minute. dropping only when the drones left the area. One bear ran away, moving faster than it ever had. Another bear changed its home range, moving about 7.5 km (and into another bear's home range). These bears were quite familiar with the noise of machinery from motor vehicles and farm equipment.

It is a small study--4 bears and 17 flights (at a height of about 20 m) but these findings certainly indicate the need for additional research since drones are increasingly used in conservation biology to study and monitor ecosystems. 

Gunderson's interview may be heard here. Additionally, these findings have been published in Current Biology.

1 comment:


    Can man control the earth's climate, or is God in control of the weather? Do man-made carbon dioxide emission control the climate of the earth or does God control the weather? Who created the weather, man or God?

    Genesis 7:4 "For after seven more days I will cause it to rain on the earth forty days and forty nights, and I will destroy from the face of the earth all living things that I have made."(NKJV)

    Question: Did man-made CO2 emissions cause it to rain forty days and forty nights, and destroy everything but what was on the ark with Noah?

    Matthew 8:24-27......26 But He said to them, "Why are you fearful, O you of little faith? Then He arose and rebuked the winds and the sea. And there was great calm.........(NKJV)

    Questions: Did man-made CO2 emissions cause the storm. Did man calm the storm by controlling their carbon footprint?

    Job 37 1:24.... 6 For He says to the snow, 'Be on the earth': Likewise to the gentle rain and heavy rain of His strength......(NKJV)

    Question: Do men have the ability to control the climate by controlling man-made CO2 emissions?

    Psalm 135:6-7 Whatever the Lord pleases He does, In heaven and on earth, In the seas and in all deep places. 7 He causes the vapors to ascend from the ends of the earth; He makes lightning for the rain; He brings the wind out of His treasuries.(NKJV)

    Question: Can men control the climate by controlling man-made CO2 emissions?

    Who is in control of the climate, God in heaven or puny men on earth?

    [NOTE: Carbon dioxide is not a pollutant; neither is oxygen nor water. CO2, O, and H2O are necessary to sustain life.]

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