Mate choice is context dependent, but the importance of current context to interspecific mating and hybridization is largely unexplored. An important influence on mate choice is predation risk. We investigated how variation in an indirect cue of predation risk, distance to shelter, influences mate choice in the swordtail Xiphophorus birchmanni, a species which sometimes hybridizes with X. malin...

Studies of mate choice evolution tend to focus on how female mating preferences are acquired and how they select for greater elaboration of male traits. By contrast, far less is known about how female preferences might be lost or reversed. In swordtail fish Xiphophorus, female preference for the sword ornament is an ancestral trait. Xiphophorus birchmanni, however, is one species that has secon...

Xiphophorus cortezi males are polymorphic for the pigment pattern vertical bars. In this study, we determined whether X. cortezi females are polymorphic in their preference for this trait by examining both withinand between-individual variation in female preference. There was significantly more variation in female preference within than between individuals using both video animations and live m...

Abstract In 1792 foreigners flocked to France participate in the new republican regime, redefining nation as conduct of popular sovereignty. A number American, British, and Irish formed a club Paris, Society Friends Rights Man (Société des Amis Droits de l'Homme), among whom republicans were key component. Eager “revolutionize” Britain Ireland, they contributed rise tensions and, ultimately, ou...

The ethical dilemmas of treating fulminant (or subfulminant) hepatic failure with liver replacement have been apparent since the earliest trials of this procedure. Acute hepatic failure was the indication for orthotopic liver transplantation in only I of our first 237 recipients I and accounted for only 8 of the next 300.2 Our reluctance to proceed with more cases was that unlike candidates who...

MY COMMENTS ON the future of Socialism are divided into three parts. The first deals with Sovietism, or Marxist Socialism modified by the Russian tradition, and its offsprings around the world. The second has to do with various hues of social democracy, from the vaguely Gramscian Marxist variety to the welfare state of mixed origins. The third deals with one reason why some form of Socialism ma...

This paper reports a new aspect of male signalling in the green swordtail Xiphophorus hellerii. Males are highly ornamented and possess a sword (an extension of the caudal fin), as well as a lateral stripe that has been shown to be a badge of status. Males of one natural population, however, were found to quickly change the colour of their lateral stripe to red when socially dominant over other...