2 resultados para Black shales

em Bucknell University Digital Commons - Pensilvania - USA


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Clothes offer us a commentary on the individual who wears them, and one of those comments deals with gender. Clothing is fundamental to gender, turning male and female bodies into men and women. In the nineteenth century the preoccupation with appear- ances was greater than in previous periods thanks to changes in the social system and a reformulation of gender roles, as well as the popularity of physiognomic theory. Given this increased sensitivity to the gaze, it is curious that men would uniformly adopt the black suit as their garment of choice. This revolution in male fashion was born from contradic- tory motives. On the one hand, the man in black attempted to avoid the gaze so as not to be anyone’s object of desire. An exception to this rule was the elegante, for whom fashion was a way of life. The elegante became a frequent target of the satirical press, which ques- tioned his masculinity. On the other hand, the black suit came simbolize the power of the ascendant middle class because it recalled Spain’s most important monarchs, such as Carlos V and Felipe II. The black suit thus became a polysemic signifier, and the man who wore it attempted, impossibly, to be both the subject and object of the gaze.

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In birds with facultative brood reduction, survival of the junior chick is thought to be regulated primarily by food availability. In black-legged kittiwakes (Rissa tridactyla) where parents and chicks are provided with unlimited access to supplemental food during the breeding season, brood reduction still occurs and varies interannually. Survival of the junior chick is therefore affected by factors in addition to the amount of food directly available to them. Maternally deposited yolk androgens affect competitive dynamics within a brood, and may be one of the mechanisms by which mothers mediate brood reduction in response to a suite of environmental and physiological cues. The goal of this study was to determine whether food supplementation during the pre-lay period affected patterns of yolk androgen deposition in free-living kittiwakes in two years (2003 and 2004) that varied in natural food availability. Chick survival was measured concurrently in other nests where eggs were not collected. In both years, supplemental feeding increased female investment in eggs by increasing egg mass. First-laid ("A") eggs were heavier but contained less testosterone and androstenedione than second-laid ("B") eggs across years and treatments. Yolk testosterone was higher in 2003 (the year with higher B chick survival) across treatments. The difference in yolk testosterone levels between eggs within a clutch varied among years and treatments such that it was relatively small when B chick experienced the lowest and the highest survival probabilities, and increased with intermediate B chick survival probabilities. The magnitude of testosterone asymmetry in a clutch may allow females to optimize fitness by either predisposing a brood for reduction or facilitating survival of younger chicks.