Search results for " Beak"
showing 10 items of 35 documents
Peñón de la Zorra y Puntal de los Carniceros (Villena, Alicante): Revisión de dos conjuntos de yacimientos campaniformes en el corredor del Vinalopó
2002
En el presente artículo se revisa la información existente sobre dos yacimientos campaniformes del Alto Vinalopó –Peñón de la Zorra y Puntal de los Carniceros–. Su importancia dentro de la investigación en tierras levantinas los ha convertido en una referencia casi obligatoria desde su publicación por parte de J. M. Soler García. In this article is cheked information about two bell beaker sites from Vinalopo Valley –Peñón de la Zorra and Puntal de los Carniceros–. The importance of this archaeological sites of investigation concerning Levante areas have got that these places would be an obligatory reference since the publication by J.M. Soler Garcia.
An experimental test of the dose-dependent effect of carotenoids and immune activation on sexual signals and antioxidant activity.
2004
Carotenoid‐based sexual traits are thought to be reliable indicators of male quality because they might be scarce and therefore might indicate the ability of males to gather high‐quality food and because they are involved in important physiological functions (as immune enhancers and antioxidants). We performed an experiment where male and female zebra finches (Taeniopygia guttata) were provided with increasing carotenoid doses in the drinking water during 4 weeks (bill color of this species is a carotenoid‐based sexual signal). Simultaneously, birds were split into two groups: one receiving weekly injections of Escherichia coli lipopolysaccharide in order to activate the immune system, the …
Environmental stress affects the expression of a carotenoid-based sexual trait in male zebra finches.
2007
SUMMARY Abiotic factors including thermal stress are suggested to exert constrains on sexual ornaments through trade-offs between sexual displays and physiological functions related to self-maintenance. Given the health properties of carotenoid pigments, carotenoid-based ornaments offer a relevant context in which to investigate the effect of environmental stress, such as ambient temperature, on the production and maintenance of secondary sexual traits and, also, to explore the proximate mechanisms shaping their expression. In this study, we exposed male zebra finches (Taeniopygia guttata) to environmental stress by exposing them to two temperature regimes (6 and 26°C) over a 4 week period.…
The beaker phenomenon and the Genomic transformations of Northwest Europe
2018
Bell Beaker pottery spread across western and central Europe beginning around 2750 BCE before disappearing between 2200–1800 BCE. The mechanism of its expansion is a topic of long-standing debate, with support for both cultural diffusion and human migration. We present new genome-wide ancient DNA data from 170 Neolithic, Copper Age and Bronze Age Europeans, including 100 Beaker-associated individuals. In contrast to the Corded Ware Complex, which has previously been identified as arriving in central Europe following migration from the east, we observe limited genetic affinity between Iberian and central European Beaker Complex-associated individuals, and thus exclude migration as a signific…
Carotenoid trade-off between parasitic resistance and sexual display: an experimental study in the blackbird (Turdus merula).
2008
Many parasites depress the expression of the carotenoid-based colour displays of their hosts, and it has been hypothesized that animals face a trade-off in carotenoid allocation between immune functions and ‘degree of ornamentation’. While numerous correlative studies suggest that parasite infection decreases the intensity of carotenoid-based colour displays, the existence of this trade-off has never been demonstrated experimentally in a host–parasite model. In this study, we used the blackbird ( Turdus merula ) and Isospora (an intestinal parasite) to assess whether this trade-off does indeed exist. Blackbirds were supplemented with carotenoids while simultaneously being exposed to parasi…
Gastrointestinal helminths of cuvier’s beaked whales, ziphius cavirostris, From the Western Mediterranean
2004
We examined the gastrointestinal helminth fauna of 2 Cuvier's beaked whales, Ziphius cavirostris, stranded on the Spanish Mediterranean coast. Information regarding intestinal parasites of this species is provided for the first time. Six helminth taxa were identified. Thirty type II larvae of the nematode Anisakis sp. were found in the stomach and the intestine of both hosts; 2 type I larvae of Anisakis sp. were found in the intestine of 1 host. One juvenile of the acanthocephalan Bolbosoma vasculosum was found in the intestine; the metacestode Scolex pleuronectis was found mainly in the terminal colon and the anal crypts of both hosts; adult cestodes of Tetrabothrius sp., which may represe…
Explorations, implantations et diffusions : le "phénomène" campaniforme en France méditerranéenne
2004
In the south-east of France, the first Bell Beaker expansion is manifested by the presence of isolated ceramics but also by a series of settlements established in contact with the indigenous populations. Analysis of the assemblages, their composition and their distribution makes it possible to propose a model of the appearance and development of the Bell Beaker phenomenon but also the probable origin of the elements present in this area.
2500 avant notre ère : l’implantation campaniforme en France méditerranéenne
2013
Around 2 500 BC, drinking beakers with a characteristic pattern appeared in diverse areas of Europe. They are frequently associated with other kinds of materials, like specific ornaments and weapons. This set defines what is called the Bell Beaker phenomenon. In Southern France, more than 600 sites are known. In this very rich European study area, it is possible to study the nature and origin of this phenomenon, and question its poten-tial exogenous components, its modes of establishment and development, and its rela-tionship with local groups that had already settled in the South of France. Consequently, a layout similar to the Greek colonization model of the Mediterranean coast is proposed
Phénomène, culture et tradition : statuts et r̂oles du Campaniforme au IIIe millénaire dans le Sud-Est de la France
1998
Abstract The "Bell Beaker " complex should not be globally perceived, because it seems to include several different entities, as shown by its variations in space and time. A regional approach, in south-eastern France, outlines the existence of a first " Bell Beaker Phenomenon " and its spread in Late Neolithic societies. This relatively marginal phenomenon quickly becomes an actual independent "Bell Beaker Culture ", with different geographical fades. These may have been in contact with surviving local cultures. In the Early Bronze Age, a "Bell Beaker Tradition " integrates some new elements brought in from outside, and seems to extend the Bell Beaker culture. The role of this " Bell Beaker…
Les Campaniformes dans le sud-est de la France
2004
The term "Bell Beaker", in the strict sense, designates a ceramic beaker form with an S-shaped profile that gives it the shape of an inverted bell. This type of drinking-vessel is characterized by both its very particular pattern of decoration and by the generally skilled execution of that decoration. By extension, the decoration characteristic of these beakers bas allowed the expansion of the category "Bell-Beaker" to include other pottery forms and even other types of decoration showing the same tradition, vvhich probably represent an evolution or reproduction of the original Bell Beaker pattern, The recognition of these objects and their definition as a class date to the nineteenth centu…