An amphibian species pushed out of Britain by a moving hybrid zone

Stabilization of a salamander moving hybrid zone

When related species meet upon postglacial range expansion, hybrid zones are frequently formed. Theory predicts that such zones may move over the landscape until equilibrium conditions are reached. One hybrid zone observed to be moving in historical times (1950-1979) is that of the pond-breeding salamanders Triturus cristatus and Triturus marmoratus in western France. We identified the ecologic...

Inferences from a rapidly moving hybrid zone.

Anartia fatima and Anartia amathea (Lepidoptera: Nymphalidae) are sister taxa whose ranges abut in a narrow hybrid zone in eastern Panama. At the center of the zone, hybrids are abundant, although deviations from Hardy-Weinberg and linkage disequilibria are strong, due in part to assortative mating. We measured differences across the zone in four wing color-pattern characters, three allozyme lo...

Thrombolysis for stroke: pushed out of the window?

an inverstigation into the shrinkage behavior (kinetics) of microfilled hybrid and nano dental composites

چکیده ندارد.

Moving Up or Moving Out :

This research note presents a theory of congressional retirement and tests it with data from the 102d Congress. The results bridge the gap between the 1970s macro retirement studies and the more recent micro-centered approaches by highlighting the importance of career ceilings. Defined as the interaction between formal position and years of service, the career ceilings variable can be interpret...