Solid line slope can be steeper or shallower depending on habitat. Intercellular Signalling Animals regularly signal to each other in their various encounters. Cells of multicellular organisms must constantly be in communication with each other to maintain accurate functioning of the body. Our preliminary investigations suggest that cell signals may not always be reliable, and that costly signals may be required to identify and eliminate poor quality cells. Signals even within bodies may have features akin to a peacock's tail.
Population declines and range contractions among farmland birds in Britain.
Spatial structure and the evolution of honest cost-free signaling. How migration affects estimation of the extinction threshold. Phylogenies of prion proteins.