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THE FORUM
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20-Apr-23, 08:32:48 AM
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11251
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Other Nature Related Information / Raptor Web Cams / Re: Norfolk Eagles in their new nest
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on: 19-Jan-12, 05:23:05 PM
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Eagle Mortality Norfolk
Botanical Garden
On a global scale, our electrical infrastructure kills millions of
birds annually. There are three common
ways that birds are killed when interacting with transmission or distribution
lines. The most common of these is
referred to as pole electrocution. Birds
perching on power poles are electrocuted when they come in contact with two
conductors and complete a circuit. To
overcome this problem, power companies have retrofitted power poles in areas
known to have problems to prevent birds from making these contacts. The second most common cause is referred to
as a mid-line electrocution which occurs when a large bird flies through the
lines and is able to complete a circuit by touching two wires with its
wingtips. The third form of mortality is
when a bird flies into lines does not complete a circuit but is killed by the
trauma. Bald eagles are particularly
vulnerable to mortalities related to the electrical infrastructure because they
are large enough to bridge the gap between conductors.
In a recent investigation of 62 eagle mortalities caused by power lines
within the upper Chesapeake Bay, Bryan Watts and Libby Mojica from The Center
for Conservation Biology determined that both line location and context had a
significant influence on the likelihood that they would kill eagles. Lines that are near water or foraging areas
are crossed regularly and have a greater likelihood of being problem lines. Lines that are exposed in open areas are much
more likely to kill eagles compared to those that are associated with screening
vegetation. This is because tall trees
planted near electrical lines serve to shift the flight line of eagles above
the power lines.
In just the past 2 weeks, two eagles have been found dead within the
grounds of Norfolk Botanical Garden that were associated with power lines. The first was an adult-plumaged female and the
second was a juvenile-plumaged bird. The
juvenile clearly died by trauma-related mid-line strike, and the adult is suspected
as having also died by trauma-related mid-line strike. The extent to which these mortalities were
facilitated by interactions with other eagles is not clear. We have very little information on causes and
rates of eagle mortality but such events are likely much more common than we
currently know.
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11253
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Other Nature Related Information / General Nature Discussion / Have some of my quail, I insist
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on: 19-Jan-12, 03:07:11 PM
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http://youtu.be/tjatWMTMhVg Gyrfalcon sharing with a Saluki, Gyrfalcons are badass. Native to Greenland, they are the largest falcon and can knock a Canadian Goose out of the air at 2000 ft. Falcons and dogs have evolved a mutually beneficial relationship over thousands of years, whereby food is shared by the falcon and their protection from other predators such as wolves is taken on by certain dogs. Salukis are badass too and can take out a coyote at full speed.
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11255
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Anything Else / Totally OT / Re: A question from Mirta
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on: 19-Jan-12, 11:40:22 AM
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Not really OT - had to put it somewhere.
Mirta in Argentina posted this on FB - I said I would post it here for her. Anyone help her?? Thanks!
Mirta says: "great! I can't enter rfalcomforum anymore, only can read the messges in my yahoo account, don't know why. I've wrote twice asking advice but I didn't recieve any answer. It is difficult for me now read all the messages that way, without knowing the author or in line all the messages with same subject."
Gee, poor Mirta! Was wondering why she hasn't been on. I have no real clue as to why she can't get on. Did she put in her password? Can she even get to the page? Shouldn't be difficult if she can get to the main page then sign in! Need more info maybe on what she is experiencing! |
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