visual migration of birds
Andrew Farnsworth (Cornell Ph.D. student) studies flight calls of migrating birds. These vocalizations are short in duration, variable in frequency, species-specific, and primarily nocturnal. As part of a larger study of the function of flight calls and flight calling behavior, Andrew is using a phylogeny of wood-warblers (family Parulidae) reconstructed from mitochondrial and nuclear DNA to study what factors (e.g., body mass) might drive the variation in flight calls (e.g., frequency) among different species.
Migrating birds are attracted to the lights on television, radio, and cell-phone towers and will circle them for hours. Many mornings, Kemper found hundreds of dead birds. One morning he found 11,000. In 2002, he discontinued his study because he was no longer finding dead birds. He says he’s not certain why, but speculates that birds are becoming accustomed to the towers.
Kemper, Charles. 1996. A Study of Bird Mortality at as West Central Wisconsin TV Tower from 1957-1995. Passenger Pigeon, 58: 219-235.
Andere referenties (van Ornithological Council Towerkill Resolution):
- Cochran, William W. and Richard R. Graber. 1958. Attraction of nocturnal migrants by lights on a television tower. Wilson Bulletin, 70:378-380.
- Larkin, Ronald P., and Barbara A. Frase. 1988. Circular paths of birds flying near a broadcasting tower in cloud. Journal of Comparative Psychology 102:90-93.
- Ogden, Lesley P. 1996. Collision course: the hazards of lighted structures and windows to migrating birds. World Wildlife Fund Canada and the Fatal Lights Awareness Program, 46 pp.
Towerkill Workshop met gedetailleerde wetenschappelijke bendaringen.