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Search Results: 1 - 10 of 8936 matches for " Marie-Jeanne Holveck "
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An Experimental Test of Condition-Dependent Male and Female Mate Choice in Zebra Finches
Marie-Jeanne Holveck, Nicole Geberzahn, Katharina Riebel
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0023974
Abstract: In mating systems with social monogamy and obligatory bi-parental care, such as found in many songbird species, male and female fitness depends on the combined parental investment. Hence, both sexes should gain from choosing mates in high rather than low condition. However, theory also predicts that an individual's phenotypic quality can constrain choice, if low condition individuals cannot afford prolonged search efforts and/or face higher risk of rejection. In systems with mutual mate choice, the interaction between male and female condition should thus be a better predictor of choice than either factor in isolation. To address this prediction experimentally, we manipulated male and female condition and subsequently tested male and female mating preferences in zebra finches Taeniopygia guttata, a songbird species with mutual mate choice and obligatory bi-parental care. We experimentally altered phenotypic quality by manipulating the brood size in which the birds were reared. Patterns of association for high- or low-condition individuals of the opposite sex differed for male and female focal birds when tested in an 8-way choice arena. Females showed repeatable condition-assortative preferences for males matching their own rearing background. Male preferences were also repeatable, but not predicted by their own or females' rearing background. In combination with a brief review of the literature on condition-dependent mate choice in the zebra finch we discuss whether the observed sex differences and between-studies differences arise because males and females differ in context sensitivity (e.g. male-male competition suppressing male mating preferences), sampling strategies or susceptibility to rearing conditions (e.g. sex-specific effect on physiology). While a picture emerges that juvenile and current state indeed affect preferences, the development and context-dependency of mutual state-dependent mate choice warrants further study.
Eggshell Spottiness Reflects Maternally Transferred Antibodies in Blue Tits
Marie-Jeanne Holveck, Arnaud Grégoire, Vincent Staszewski, Romain Guerreiro, Philippe Perret, Thierry Boulinier, Claire Doutrelant
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0050389
Abstract: Blue-green and brown-spotted eggshells in birds have been proposed as sexual signals of female physiological condition and egg quality, reflecting maternal investment in the egg. Testing this hypothesis requires linking eggshell coloration to egg content, which is lacking for brown protoporphyrin-based pigmentation. As protoporphyrins can induce oxidative stress, and a large amount in eggshells should indicate either high female and egg quality if it reflects the female's high oxidative tolerance, or conversely poor quality if it reflects female physiological stress. Different studies supported either predictions but are difficult to compare given the methodological differences in eggshell-spottiness measurements. Using the blue tit Cyanistes caeruleus as a model species, we aimed at disentangling both predictions in testing if brown-spotted eggshell could reflect the quality of maternal investment in antibodies and carotenoids in the egg, and at improving between-study comparisons in correlating several common measurements of eggshell coloration (spectral and digital measures, spotted surface, pigmentation indices). We found that these color variables were weakly correlated highlighting the need for comparable quantitative measurements between studies and for multivariate regressions incorporating several eggshell-color characteristics. When evaluating the potential signaling function of brown-spotted eggshells, we thus searched for the brown eggshell-color variables that best predicted the maternal transfer of antibodies and carotenoids to egg yolks. We also tested the effects of several parental traits and breeding parameters potentially affecting this transfer. While eggshell coloration did not relate to yolk carotenoids, the eggs with larger and less evenly-distributed spots had higher antibody concentrations, suggesting that both the quantity and distribution of brown pigments reflected the transfer of maternal immune compounds in egg yolks. As yolk antibody concentrations were also positively related to key proxies of maternal quality (egg volume, number, yellow feather brightness, tarsus length), eggshells with larger spots concentrated at their broad pole may indicate higher-quality eggs.
The composition of cuticular compounds indicates body parts, sex and age in the model butterfly Bicyclus anynana (Lepidoptera)
Stéphanie Heuskin,Maryse Vanderplanck,Marie-Jeanne Holveck,Tobias Engl,Cédric Taverne,Georges Lognay,Caroline M. Nieberding
Frontiers in Ecology and Evolution , 2014, DOI: 10.3389/fevo.2014.00037
Abstract: Chemical communication in insects' sexual interactions is well-known to involve olfaction of volatile compounds called sex pheromones. In theory, sexual chemical communication may also involve chemicals with low or no volatility exchanged during precopulatory gustatory contacts. Yet, knowledge on this latter type of chemicals is so far mostly restricted to the Drosophila fly model. Here we provide the most comprehensive characterization to date of the cuticular chemical profile, including both volatile and non-volatile compounds, of a model butterfly, Bicyclus anynana. First, we characterized the body distribution of 103 cuticular lipids, mostly alkanes and methyl-branched alkanes, by gas chromatography coupled to mass spectrometry (GC-MS). Second, we developed a multivariate statistical approach to cope with such complex chemical profiles and showed that variation in the presence or abundance of a subset of the cuticular lipids indicated body parts, and traits involved in B. anynana mate choice, namely sex and age. Third, we identified the chemical structure of the 20 most indicative compounds, which were on average more abundant (1346.4 ± 1994.6 ng; mean ± SD) than other, likely less indicative, compounds (225.9 ± 507.2 ng; mean ± SD). Fourth, we showed that wings and legs displayed most of the chemical information found on the entire body of the butterflies. Fifth, we showed that non-random gustatory contacts occurred between specific male and female body parts during courtship. The body parts mostly touched by the conspecific displayed the largest between-sex differentiation in cuticular composition. Altogether, the large diversity of cuticular lipids in B. anynana, which exceeds the one of Drosophila flies, and its non-random distribution and evaluation across individuals, together suggest that gustatory information is likely exchanged during sexual interactions in Lepidoptera.
Commissioning for health and well-being: an introduction
Marie-Jeanne Aarts
International Journal of Integrated Care , 2012,
Abstract:
Thomas Bender, ed. Rethinking American History in a Global Age.
Marie-Jeanne Rossignol
Transatlantica : Revue d'études Américaines , 2006,
Abstract: L’OAH, l’association américaine des historiens de l’Amérique, s’efforce depuis une vingtaine d’années d’internationaliser ses pratiques, sinon ses problématiques. Internationaliser , cela signifie, entre autres choses, s’ouvrir à des histoires et des auteurs non américains. La revue de l’association, le Journal of American History, est donc dotée d’un Advisory Board d’américanistes du monde entier ; sous l’impulsion d’un des anciens rédacteurs en chef du JAH, David Thelen, l’association dé...
Annie Lechenet. Jefferson-Madison, Un débat sur la République.
Marie-Jeanne Rossignol
Transatlantica : Revue d'études Américaines , 2006,
Abstract: Annie Léchenet est une philosophe, auteure d’une thèse sur la citoyenneté chez Thomas Jefferson. Pour cet ouvrage au format imposé (128 pages), les PUF lui ont confié la mission plus ambitieuse encore consistant à présenter les idées de Jefferson et de Madison. L’angle choisi est plut t original : alors qu’il est de tradition d’associer les deux hommes, fondateurs du parti démocrate-républicain dans les années 1790, puis proches collaborateurs politiques tout le reste de leur existence, Annie...
L’Atlantique de l’esclavage, 1775 1860.
Marie-Jeanne Rossignol
Transatlantica : Revue d'études Américaines , 2006,
Abstract: Although slavery was condemned in France, Britain, and the United States from the 1770s to the 1790s, leaders in all three countries considered that as a first step the international slave trade should be abolished. Britain was particularly active in promoting an international campaign against the trade after 1807, mainly by diplomatic means. This led to a spate of declarations and treaties in the 1810s and 1820s, and to a general agreement in Western countries on how unacceptable and criminal the importation of enslaved Africans was. However the now illegal trade picked up after 1820 due to a growing demand for labour in plantation societies in the Americas. Nationalist concerns clashed with humanitarian goals on the Atlantic, hindering real international police efforts. Most ambiguous in its commitment to ending the transatlantic slave trade was the United States : not only did it not repress the trade but American entrepreneurs were often involved in the transatlantic operations. The point of the paper is to examine this gradualist period in the history of antislavery, insisting on its international and comparative dimension, while underlying the peculiar position of the United States in the antebellum period.
Benjamin Franklin, 1706-2008 : anatomie d’un tricentenaire transatlantique
Marie-Jeanne Rossignol
Transatlantica : Revue d'études Américaines , 2009,
Abstract: Cet article analyse le Tricentenaire de Benjamin Franklin, qui eut lieu de 2006 à 2008. A l’occasion de cette date anniversaire, de nombreux livres furent publiés, des colloques et expositions organisés aux Etats-Unis. Ces travaux et manifestations ont produit un nouveau regard, critique, sur Franklin, père fondateur assez extraordinaire. L’exposition principale est venue à Paris, au cours de l’hiver 2007-2008, clairement dans le cadre d’une volonté de rapprocher les deux pays à la suite des controverses suscitées par la Guerre en Irak. Cette commémoration franco-américaine a eu comme objectif principal de souligner la diplomatie et la collaboration transatlantiques, et non de présenter Franklin sous toutes ses facettes, et de l’intégrer au contexte de son époque dans son pays. Un symposium fut donc organisé à l’Université Paris – Diderot afin de mettre en valeur les travaux scientifiques sur Franklin, fran ais, mais aussi étrangers. Les principales communications sont présentées dans ce dossier. This paper offers reflections on the Benjamin Franklin Tercentenary, which took place from 2006 to 2008. This anniversary was celebrated by many publications, conferences and exhibitions in the United States, producing a renewed and critical understanding of Franklin, “not your usual founding father”. The main exhibition travelled to France (2007-2008), clearly as part of an attempt to patch up relationships between the two countries in the wake of the Iraq war controversy. The main focus in this Franco-American commemoration was on transatlantic diplomacy and collaboration, not really on Franklin in his multiple capacities, in his time and country of birth. The conference organized at Université Paris-Diderot in January 2008 was by contrast a scholarly affair, highlighting work on Franklin conducted by French and foreign specialists. Most of the papers are presented here.
ROMANIA – FRUITS AND VEGETABLES EXPORT POTENTIAL ASSESSMENT
Dumitrescu Marie-Jeanne
Annals of the University of Oradea : Economic Science , 2009,
Abstract: During 2003-2007, Romania was a dynamic exporter of fruits and vegetables, recording an annual average growth in value of 5.4%. This trend was driven mainly by the excellent performance of fruits exports, which registered an average growth of 8%. Yet, fru
Table ronde Autour du livre de Fran ois Cusset, French Theory et des Cultural Studies, 19 novembre 2004
Pierre Guerlain,Marie-Jeanne Rossignol
Transatlantica : Revue d'études Américaines , 2006,
Abstract: Compte rendu coordonné par Marie Jeanne Rossignol (Paris 7) et Pierre Guerlain (Paris 10)IntroductionLa parution du livre de Fran ois Cusset, French Theory. Foucault, Derrida, Deleuze & Cie et les mutations de la vie intellectuelle aux Etats Unis en 2003, à La Découverte, a soudain donné une plus grande visibilité en France aux Cultural Studies et autres mouvements intellectuels inspirés de théoriciens européens (et non seulement fran ais) qui ont fleuri aux Etats Unis pendant les vingt année...
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