951 resultados para Contemporary life
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Although rapid phenotypic evolution during range expansion associated with colonization of contrasting habitats has been documented in several taxa, the evolutionary mechanisms that underlie such phenotypic divergence have less often been investigated. A strong candidate for rapid ecotype formation within an invaded range is the three-spine stickleback in the Lake Geneva region of central Europe. Since its introduction only about 140 years ago, it has undergone a significant expansion of its range and its niche, now forming phenotypically differentiated parapatric ecotypes that occupy either the pelagic zone of the large lake or small inlet streams, respectively. By comparing museum collections from different times with contemporary population samples, we here reconstruct the evolution of parapatric phenotypic divergence through time. Using genetic data from modern samples, we infer the underlying invasion history. We find that parapatric habitat-dependent phenotypic divergence between the lake and stream was already present in the first half of the twentieth century, but the magnitude of differentiation increased through time, particularly in antipredator defence traits. This suggests that divergent selection between the habitats occurred and was stable through much of the time since colonization. Recently, increased phenotypic differentiation in antipredator defence traits likely results from habitat-dependent selection on alleles that arrived through introgression from a distantly related lineage from outside the Lake Geneva region. This illustrates how hybridization can quickly promote phenotypic divergence in a system where adaptation from standing genetic variation was constrained.
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The occurrence of contemporary ecotype formation through adaptive divergence of populations within the range of an invasive species typically requires standing genetic variation but can be facilitated by phenotypic plasticity. The relative contributions of both of these to adaptive trait differentiation have rarely been simultaneously quantified in recently diverging vertebrate populations. Here we study a case of intraspecific divergence into distinct lake and stream ecotypes of threespine stickleback that evolved in the past 140 years within the invasive range in Switzerland. Using a controlled laboratory experiment with full-sib crosses and treatments mimicking a key feature of ecotypic niche divergence, we test if the phenotypic divergence that we observe in the wild results from phenotypic plasticity or divergent genetic predisposition. Our experimental groups show qualitatively similar phenotypic divergence as those observed among wild adults. The relative contribution of plasticity and divergent genetic predisposition differs among the traits studied, with traits related to the biomechanics of feeding showing a stronger genetic predisposition, whereas traits related to locomotion are mainly plastic. These results implicate that phenotypic plasticity and standing genetic variation interacted during contemporary ecotype formation in this case.
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This document proceeds from the research for my doctoral thesis titled This thesis is about the subject of Eden or paradise in architecture, to understand its concepts and be able to generate a general model to generate architecture that places us in a virtual way in paradisiacal places, in holidays as well as in daily life. It also seeks to build a system of measure to be used to turn into Eden the previously non “Edenic”. A comparative measuring system to know where we are in relation to how much Eden is present in places to intervene, or project. Eden; Tale, Image and Project. The zones of the thesis that are related to this congress are those related to the use of this tale, idea and image of the collective unconscious, when it comes to projecting a place that locates us physically, mentally and in our mood in paradise.
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The ‘Catholic question’ in contemporary Portugal obliges us to consider whether Catholicism will remain a force in Portuguese associational life in the next century, or whether it faces a future of slow and steady decline. On the one hand, an overall statistical drop of church membership, and the lack of religious practice by almost half of self-identified Roman Catholics, suggests that the future of the Catholic Church in Portugal will probably be very different than the past. On the other hand, the church’s support for democratic processes, the important social services it provides, and its educational establishment, have certainly been a positive factor in Portuguese associational life, and helped the larger process of democratic-regime consolidation since the Carnation Revolution of 1974. This paper suggests that social scientists need to move beyond the lens normally applied to the question of Catholicism in contemporary Europe (i.e. it is a dying, anti-modern, anti-rational, conservative institution), and instead consider the complex interplay of its demographic challenges combined with the popular sources of its theological and spiritual strength, as well as its vital societal contributions, to assess whether or not it will remain a force in Portuguese associational life in the future.
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Cooking recipes on p. 17-24.
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"Errata": p. [1] at end.
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"Location of the Societies": p. 6-7.
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Papers originally published in the Contemporary review, the National review, and the Spectator.
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Appendix (From the Tablet, September 27, 1884) St. Augustine's cross in the Isle of Thanet.
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Some issues have also distinctive titles.
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The dissertation on Perkin Warbeck appeared as an article in the Contemporary review; a few paragraphs have been added. cf. Pref.
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Translation of La vie simple.
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Advertising matter : p. 359-366.
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Introduction signed and dated: George Thompson, 9, Blandford Place, Regent's Park, October 18th, 1842.
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Compare: Library Company of Philadelphia. Afro-Americana, 1553-1906, 3234.