One of the most important events in vertebrate evolution was the acquisition of endothermy, the ability to use metabolic heat production to elevate body temperature above environmental temperature. Several verbal models have been proposed to explain the selective factors leading to the evolution of endothermy. Of these, the aerobic capacity model has received the most attention in recent years....

this study was performed to investigate the photosynthetic partitioning pattern of materials to aerial parts of bread wheat in dryland conditions. it was as well to study its relationship with bread wheat resistance and grain yield in drought conditions. seven genotypes including two cultivars (azar2, sardari) and five lines were investigated in a field experiment through a randomized complete ...

Correspondence: D. A. Gray, Biological Sciences, Brock University, St Catharines, Ontario L2S 3A1, Canada (email: [email protected]). The genetic correlation between mating preferences and sexually selected (epigamic) traits is a central issue in both Fisherian and good genes models of mate choice (Fisher 1930; O’Donald 1980; Lande 1981; Pomiankowski 1988). One method of demonstrating ...