Changing signals

Ornamental bill color rapidly signals changing condition

M. F. Rosenthal and K. A. Tarvin ([email protected]), Dept of Biology, Oberlin College, OH 44074, USA. Present address of MFR: School of Biological Sciences, Univ. of Nebraska, Lincoln, NE 68588-0118, USA. – T. G. Murphy, Dept of Biology, Queen’s Univ., Kingston, ON K7L 3N6, Canada. Present address of TGM: Dept of Biology, Trinity Univ., San Antonio, TX 78212, USA. – N. Darling, Dept of ...

Flexibility in Animal Signals Facilitates Adaptation to Rapidly Changing Environments

Charles Darwin posited that secondary sexual characteristics result from competition to attract mates. In male songbirds, specialized vocalizations represent secondary sexual characteristics of particular importance because females prefer songs at specific frequencies, amplitudes, and duration. For birds living in human-dominated landscapes, historic selection for song characteristics that conv...

Top flavour-changing neutral coupling signals at a linear collider

We present an analysis of the sensitivity of the TESLA e+e− collider to top flavour-changing neutral couplings to the Z boson and photon. We consider the cases without beam polarization, with only e− polarization and with e− and e+ polarization, showing that the use of the latter substantially enhances the sensitivity to discover or bound these vertices. For some of the couplings the expected L...

Signals from seabirds indicate changing biology of capelin stocks

Key forage species lie at the core of complex marine food webs, providing essential linkages among trophic levels. We examined the interactions of an important forage and commercial fish, capelin Mallotus villosus, and its primary avian predator, the common murre Uria aalge, in the NW Atlantic. Murres are capelin specialists and robust samplers of capelin biology. During the 1990s, the coldest ...

Changing perceptions, changing reality.