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by PYoungbaer » Jun 3, 2010 12:48 pm
According to the folks studying bats and wind turbines, bats clearly don't like to fly when it's windy. That's why a number of the studies on wind turbine mitigation involve raising the turbine cut-in speeds to higher wind speeds. For the summer acoustical monitoring, when it's that windy, the bats aren't out in any significant numbers, so it's not a good use of resources.
tncaver wrote:There are always at least two sides to every situation. Until I see evidence that disputes my side beyond a doubt, I will not give it up.
I've not seen anything that comes close.
Higher bat activity (e.g., Arnett et al. 2006, 2007b, Redell et al. 2006, Reynolds 2006, Weller 2007) and fatalities (Arnett et al. 2008) have been consistently related to periods of low wind speed and weather conditions typical of the passage of storm fronts. The casual mechanism underlying this relationship remains unclear, but perhaps migration is less efficient for bats in high wind speeds and thus migratory movement by these species is reduced (Baerwald et al. 2009).
Cryan and Brown (2007) reported that fall arrivals of hoary bats on Southeast Farallon Island were related to periods of low wind speed, dark phases of the moon, and low barometric pressure, supporting the view that migration events may be predictable. Low barometric pressure can coincide with passage of cold fronts that may be exploited by migrating birds and bats (Cryan and Brown 2007).
Erickson and West (2002) reported that regional climate patterns as well as local weather conditions can predict foraging and migratory activity of bats. On a local scale, strong winds can influence abundance and activity of insects, which in turn influence bat activity. Bats are known to reduce their foraging activity during periods of rain, low temperatures, and strong winds (Erkert 1982, Erickson et al. 2002). Episodic hatches of insects that are likely associated with favorable weather and flight conditions may periodically increase local bat activity (Erickson and West 2002). More studies incorporating daily fatality searches are needed so that patterns such as those described above can be determined at multiple sites across regions. These data will be critical for developing robust predictive models of environmental conditions preceding fatality events, and for predicting when operational curtailment will be most effective to reduce bat fatalities.
John Chenger wrote:TN: So no one has any idea if your "one bat" came from some other tourist or commercial cave nearby that is a "undocumented" WNS site.
tncaver wrote:My point is, the only WNS detected in Dunbar cave came from a bat that did not belong there. It doesn't really matter how that bat got there, it was there and didn't belong there. WNS did not come from cavers, it came from a bat that was documented as not belonging there.
Batgirl wrote:TN Caver,
Your We get your point. A Caver didn't transmit WNS to Dunbar (or any other cave for that matter). I would imagine that the bat showed up because it was sick and didn't have the energy to fly to its normal destination site and wound up stopping in a place its never been. Imagine when you are sick, you have no energy and can't think straight either.
Let's try and find another way to prove your point thereby achieving the same goal.
Batgirl wrote::rofl:
You won't win this fight and continuing to argue with a scientist is like
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