Search results for "history."
showing 10 items of 17659 documents
Frequency and Density-Dependent Selection on Life-History Strategies - A Field Experiment
2008
Negative frequency-dependence, which favors rare genotypes, promotes the maintenance of genetic variability and is of interest as a potential explanation for genetic differentiation. Density-dependent selection may also promote cyclic changes in frequencies of genotypes. Here we show evidence for both density-dependent and negative frequency-dependent selection on opposite life-history tactics (low or high reproductive effort, RE) in the bank vole (Myodes glareolus). Densitydependent selection was evident among the females with low RE, which were especially favored in low densities. Instead, both negative frequency-dependent and density-dependent selection were shown in females with high RE…
Minières, "ateliers" et hypogées. Étude de l’organisation du territoire dans les marais de Saint-Gond (Marne)
2013
National audience
La sociedad frente al espejo. Aproximaciones al capital social en Argentina
2015
El siguiente articulo presenta los resultados de una primera serie de mediciones sobre algunos elementos que participan del concepto de capital social, centrandonos en la confianza interpersonal y en las instituciones, y en los atributos considerados relevantes para ser un buen ciudadano en la Argentina, realizada por el Observatorio de Capital Social de la Universidad de Palermo y de la Consultora Carlos Fara y Asociados. Mientras que los primeros resultados parecen sugerir una convergencia entre los rasgos individualistas y el descredito de las instituciones asociadas a los asuntos publicos (politica, economia), una observacion mas atenta de la positiva valoracion ciudadana que mantienen …
Multitude in motion : re-readings on the political philosophy of Thomas Hobbes
2013
Los saberes en torno a la tuberculosis en Valencia a través de la prensa médica (1882-1914)
2011
Para la realización de este trabajo se ha partido del interés que tiene estudiar la literatura científica que a finales del siglo XIX y principios del XX dedicó una sociedad como la valenciana al tema de la tuberculosis, de primera importancia no solo en la realidad epidemiológica de la época, sino también para la constitución de la ciencia y las prácticas médicas contemporáneas. Se ha abordado el estudio de los saberes en torno a la tuberculosis en Valencia a través de las revistas médicas publicadas en ella entre 1882 y 1914, periodo en el que se descubrió el origen microbiano de la enfermedad y se desarrollaron nuevas técnicas diagnósticas, preventivas y curativas de la infección tubercu…
Discussions of Fatherhood in Male Batterer Treatment Group
2013
The aim of this study was to examine how men who have perpetrated violence toward their partners and participated in batterer group talked about being a father and how they perceived their own fatherhood. The discussion in the group was analyzed qualitatively by using the methods of content analysis. In traditional fatherhood, they talked about avoidant, passiveness, distant, indifference, and authoritative controlling ways of acting. These men also created an image of themselves as active and caring fathers, thus including empathy and nurture in the concept of fatherhood. This new fatherhood was considered an achieved goal and an objective for the men as being a father. Talking about fath…
The price of safety: food deprivation in early life influences the efficacy of chemical defence in an aposematic moth
2018
Aposematism is the combination of a primary signal with a secondary defence that predators must learn to associate with one another. However, variation in the level of defence, both within and between species, is very common. As secondary defences influence individual fitness, this variation in quality and quantity requires an evolutionary explanation, particularly as it may or may not correlate with variation in primary signals. The costs of defence production are expected to play a considerable role in generating this variation, yet studies of the cost of chemical defence have focused on species that sequester their defences, while studies in species that produce them de novo are scarce. …
Heterozygote advantage and pleiotropy contribute to intraspecific color trait variability
2022
The persistence of intrapopulation phenotypic variation typically requires some form of balancing selection because drift and directional selection eventually erode genetic variation. Heterozygote advantage remains a classic explanation for the maintenance of genetic variation in the face of selection. However, examples of heterozygote advantage, other than those associated with disease resistance, are rather uncommon. Across most of its distribution, males of the aposematic moth Arctia plantaginis have two hindwing phenotypes determined by a heritable one locus-two allele polymorphism (genotypes: WW/Wy = white morph, yy = yellow morph). Using genotyped moths, we show that the presence of o…
Diversity in warning coloration: selective paradox or the norm?
2019
Aposematic theory has historically predicted that predators should select for warning signals to converge on a single form, as a result of frequency-dependent learning. However, widespread variation in warning signals is observed across closely related species, populations and, most problematically for evolutionary biologists, among individuals in the same population. Recent research has yielded an increased awareness of this diversity, challenging the paradigm of signal monomorphy in aposematic animals. Here we provide a comprehensive synthesis of these disparate lines of investigation, identifying within them three broad classes of explanation for variation in aposematic warning signals: …
La voce allo specchio
2012
En partant de l'hypothèse de Rizzolatti et collègues (1998, 2007) d'un isomorphisme originaire entre phonétique et sémantique, l'article analyse le rapport entre les différences phonologiques et les différences sémantiques dans quatre ensembles de mots monosyllabiques italiens (monophonèmes, pronoms, verbes et adverbes) et montre que les signifiants tendent à s'opposer entre eux par le biais des traits phonologiques distinctifs comme les signifiés s'opposent par le biais de traits morphologiques et sémantiques. Par exemple, le premières personnes tendent à être relativement plus postérieures et graves, les deuxièmes, antérieures et aiguës et les troisièmes centrales et ouvertes. En outre, d…