Owls/Deer and the Moon
Many years ago my spotlighting (legal in eastern NC) buddy and I noticed the lack of deer in the fields during a bright moon. Knowing this always shot a hole in the usual tailgate theories of why hunting is usually not as good around full moons. It seemed to my buddy and me, deer just shut down during these times, night and day, … but that doesn’t make sense, does it? They gotta eat, right?
Well, maybe just a salad.
Here’s and interesting report that sheds a different light on the subject;
Moonlight’s influence on predator/prey interactions between short-eared owls (Asio flammeus) and deermice (Peromyscus maniculatus)
Summary;
This study examines the effect of moonlight intensity on deermouse (Peromyscus maniculatus) vulnerability to predation by short-eared owls (Asio flammeus).
Three nocturnal light intensities, labeled new moon, quarter moon, and full moon, were simulated in a flight chamber. Deermouse activity was observed and measured by an index of tracking intensity in the chamber’s sand floor. The mice were then exposed to predation by a short-eared owl in each light intensity and search time, chase time, capture time, and the number of escapes/chase were measured.
The results reveal the adaptive significance of deermouse activity suppression in full moon light as an anti-predator response. The deermice reduced activity significantly in bright moonlight during the activity phases.
During the predation phases, the owls’ hunting effectiveness increased as moonlight waxed. The owls required significantly less time to search for and capture the mice as illumination increased.
The costs and benefits to both species are discussed relative to the prey’s variation of activity with moonlight intensity.
http://www.springerlink.com/content/w3319865541nr517/
————————
All these years whenever the moon theories came up at various hunter gatherings, we always just looked at each other and kept quiet.
Some things are better left to visit … out behind the barn. ![]()
Posted on 23rd September 2007 by ncboman
Under: Uncategorized | 1 Comment »







