|
Effect of natural light spectrum and other artificial
lighting in Birds as well as animals and plants
Annual reports released by the American Medical
Association would announce that nighttime artificial lighting, especially
street lights, above 3000K can adversely affect humans and animals. So,
migratory birds following stars move to the wrong place because they can't find
the moonlight due to artificial light. Also, hundreds of birds collide
frequently and die finally at night towers. Nocturnal owls need to be active at
night, but the night is too bright to survive as a nocturnal species. (Fig.1)
Fig.1. (A) light pollution photo-exhibition (Insomnia)
(B) Iguzzini (Owl wearing sunglasses)
Sidney A. Gauthreaux, Jr. and Carroll G. Belser, Department
of Biological Sciences, Clemson University, mentioned that hundreds of species
of birds typically migrate at night, and it is well known that fires and
man-made lights attract birds during migration, particularly when the sky is
cloudy and the ceiling is low. During fall migration they monitored flight
behavior on 14 evenings near a television tower with red lights, near a
television tower with white strobe lights, and over a control area that had no
tower. They used an image intensifier to monitor birds flying overhead, and
coded the flight behavior of migrants into the following categories: linear
flight (straight) and nonlinear flight (pause-hover, curved, or circling).
During the fall study the number of birds showing nonlinear flight near the
tower with red lighting was significantly greater than those flying near the
tower with white strobes. The greater number of birds near the tower with red
lights is likely the result of "attraction" to the constantly
illuminated lights on towers with red light arrays and the proportion of the
time the birds showed nonlinear flight behavior. In general, all animals and
plants, including humans, have biorhythms. Biorhythms caused by artificial
light are disturbing not only the growth of animals and plants, but also physiology
and reproductive activity. No one knows how the ecosystem disturbances caused
by artificial lighting are further revealed, but the bottom line is that
ecosystem disturbances can only occur constantly. (Fig.2)
Fig.2.
Cities are affected by altered light
environments, which are exploited by synanthropic species such as crows and
some bat species.
Ref.:
Natural Resource Report NPS/NRSS/NSNS/NRR—2017/1493
Jae Ho Lee, Ph.D
Biologist
* Next week’s topic : Light and Plants You can find "Interesting Story about Light Science” series on the link below. http://www.seoulsemicon.com/en/technology/Sunlike/?content=lightScience Seoul Semiconductor / ohc@seoulsemicon.com 97-11, Sandan-ro 163beon-gil, Danwon-gu, Ansan-si, Gyeonggi-do, Republic of Korea Unsubscribe |
