Sexually antagonistic coevolution of a postmating-prezygotic reproductive character in desert Drosophila

Rapid divergence in postmating-prezygotic characters suggests that selection may be responsible for generating reproductive barriers between closely related species. Theoretical models indicate that this rapid divergence could be generated by a series of male adaptations and female counteradaptations by means of sexual selection or conflict, but empirical tests of particular mechanisms are generally lacking. Moreover, although a male–female genotypic interaction in mediating sperm competition attests to an active role of females, molecular or morphological evidence of the female's participation in the coevolutionary process is critically needed. Here we show that postmating-prezygotic variation among populations of cactophilic desert Drosophila reflects divergent coevolutionary trajectories between the sexes. We explicitly test the female's role in intersexual interactions by quantifying differences in a specific postmating-prezygotic reproductive character, the insemination reaction mass, in two species, Drosophila mojavensis and Drosophila arizonae. A series of interpopulation crosses confirmed that population divergence was propelled by male–female interactions, a prerequisite if the selective forces derive from sexual conflicts. An association between the reaction mass and remating and oviposition behavior argues that divergence has been propelled by sexually antagonistic coevolution, and potentially has important implications for speciation.

Geometry of the SL(3,ℂ)-character variety of torus knots.

Let G be the fundamental group of the complement of the torus knot of type (m, n). It has a presentation G = . We find a geometric description of the character variety X(G) of characters of representations of G into SL(3,ℂ), GL(3,ℂ) and PGL(3,ℂ).

E-polynomial of the SL(3,C)-character variety of free groups.

We compute the E-polynomial of the character variety of representations of a rank r free group in SL(3,C). Expanding upon techniques of Logares, Muñoz and Newstead (Rev. Mat. Complut. 26:2 (2013), 635-703), we stratify the space of representations and compute the E-polynomial of each geometrically described stratum using fibrations. Consequently, we also determine the E-polynomial of its smooth, singular, and abelian loci and the corresponding Euler characteristic in each case. Along the way, we give a new proof of results of Cavazos and Lawton (Int. J. Math. 25:6 (2014), 1450058).

E-polynomials of the SL(2, C)-character varieties of surface groups

We compute the E-polynomials of the moduli spaces of representations of the fundamental group of a once-punctured surface of any genus into SL(2, C), for any possible holonomy around the puncture. We follow the geometric technique introduced in [12], based on stratifying the space of representations, and on the analysis of the behavior of the E-polynomial under fibrations.

Character of the Mr. Appleton, 1804 November 12

Small leaf containing a handwritten extract from a November 12, 1804 letter by Rev. Joseph Lathrop to Rev. John Lathrop recommending Rev. Jesse Appleton as the successor to Dr. Tappan.

Lines in remembrance of Mr. Gannett--a tribute sincere, but unworthy of his character, undated

One-page handwritten remembrance written by "B. Kent," beginning "Hark, tis a voice on high--'Come to thy rest..."

The Discursive double game of EMU reform: the clash of titans between French White Knight and German Iron Lady. Paper presented at the 9th Biennial Conference European Community Studies Association–Canada (ECSA-C), Ottawa, Ontario, April 27-28, 2012

From the Introduction. In the aftermath of the EU’s enlargement towards Central and Eastern Europe, many scholars and observers of European integration were proclaiming that the French-German “engine” of Europe had come to an end. The political legitimacy of French-German initiatives was contested by coalitions of smaller member states and the ‘new Europe’ was calling for new leadership dynamics. However, the experience of the Eurozone debt crisis provided dramatic evidence that no alternative to the Franco-German partnership has yet to emerge in the enlarged EU. In a time of existential crisis, Franco-German initiatives appear to have remained the basic dynamic of integration. However, unlike in the past, agreements on steps forward have proven to be particularly difficult. This is largely due to these countries’ contrasting political economic policy ideas, cultures, and practices....the paper analyses the ideational ‘frames’ of the two leaders while tracing their discursive interactions against changing background conditions since the European debt crisis was triggered by Greece in October 2009 until the last measures taken in 2012 before the French Presidential elections. The empirical analysis is based on a systematic corpus of press conferences and media interviews by Nicolas Sarkozy and Angela Merkel after European summits. It is complemented by a number of press interviews including some given by their respective Finance Ministers) and important speeches in that same period of time.

A Black Knight in the Eastern Neighbourhood? Russia and EU Democracy Promotion in Armenia and Moldova. EU Diplomacy Paper No. 7, October 2014

Europe’s peace and security are challenged by the events taking place in the Eastern Partnership region. Amid growing tensions between the European Union (EU) and Russia, the fate of countries in the common neighbourhood and their progress towards democracy are increasingly at stake. This paper tries to understand to what extent Russia is undermining EU democracy promotion in the Union’s eastern neighbourhood. By focusing on the cases of Armenia and Moldova, EU democracy promotion is analysed in light of the triangular relationship between the countries under scrutiny, the EU and Russia. It argues that domestic conditions and external pressures, linked through the filter of problems of ‘stateness’, are both crucial and mutually reinforcing for democratisation. The paper shows that Russia can undermine EU democracy promotion to the extent that it strengthens the aversion of domestic political forces to democracy-oriented reforms.