An Update on Sedimentary Pigments in Victoria Land Lakes (East Antarctica)

Antarctic ice-free areas contain lakes and ponds that have interesting limnological features and are of wide global significance as early warning indicators of climatic and environmental change. However, most linmological and paleolimnological studies in continental Antarctica are limited to certain regions. There are several ice-free areas in Victoria Land that have not yet been studied well. There is therefore a need to extend limnological studies in space and time to understand how different geological and climatic features affect the composition and biological activity of freshwater communities. With the aim of contributing to a better limnological characterization of Victoria Land, this paper reports data on sedimentary pigments (used to identify the main algal taxa) obtained through a methodology that is more sensitive and selective than that of previous studies. Analyses were extended to 48 water bodies in ice-free areas with differing lithology, latitude, and altitude, and with different morphometry and physical, chemical, and biological characteristics in order to identify environmental factors affecting the distribution and composition of freshwater autotrophic communities. A wider knowledge of lakes in a limnologically important region of Antarctica was obtained. Cyanophyta was found to be the most important algal group, followed by Chlorophyta and Bacillariophyta, whereas latitude and altitude are the main factors affecting pigment distribution.

Identifying appropriate sampling and modelling approaches for analysing distributional patterns of Antarctic terrestrial arthropods along the Victoria Land latitudinal gradient

Biotic communities in Antarctic terrestrial ecosystems are relatively simple and often lack higher trophic levels (e. g. predators); thus, it is often assumed that species' distributions are mainly affected by abiotic factors such as climatic conditions, which change with increasing latitude, altitude and/or distance from the coast. However, it is becoming increasingly apparent that factors other than geographical gradients affect the distribution of organisms with low dispersal capability such as the terrestrial arthropods. In Victoria Land (East Antarctica) the distribution of springtail (Collembola) and mite (Acari) species vary at scales that range from a few square centimetres to regional and continental. Different species show different scales of variation that relate to factors such as local geological and glaciological history, and biotic interactions, but only weakly with latitudinal/altitudinal gradients. Here, we review the relevant literature and outline more appropriate sampling designs as well as suitable modelling techniques (e. g. linear mixed models and eigenvector mapping), that will more adequately address and identify the range of factors responsible for the distribution of terrestrial arthropods in Antarctica.

Photosynthetic pigments in soils from northern Victoria Land (continental Antarctica) as proxies for soil algal community structure and function

Although soil algae are among the main primary producers in most terrestrial ecosystems of continental Antarctica, there are very few quantitative studies on their relative proportion in the main algal groups and on how their distribution is affected by biotic and abiotic factors. Such knowledge is essential for understanding the functioning of Antarctic terrestrial ecosystems. We therefore analyzed biological soil crusts from northern Victoria Land to determine their pH, electrical conductivity (EC) water content (W), total and organic C (TC and TOC) and total N (TN) contents, and the presence and abundance of photosynthetic pigments. In particular, the latter were tested as proxies for biomass and coarse-resolution community structure. Soil samples were collected from five sites with known soil algal communities and the distribution of pigments was shown to reflect differences in the relative proportions of Chlorophyta, Cyanophyta and Bacillariophyta in these sites. Multivariate and univariate models strongly indicated that almost all soil variables (EC, W, TOC and TN) were important environmental correlates of pigment distribution. However, a significant amount of variation is independent of these soil variables and may be ascribed to local variability such as changes in microclimate at varying spatial and temporal scales. There are at least five possible sources of local variation: pigment preservation, temporal variations in water availability, temporal and spatial interactions among environmental and biological components, the local-scale patchiness of organism distribution, and biotic interactions. (C) 2009 Elsevier Ltd. All rights reserved.

Temporal variation in the water chemistry of northern Victoria Land lakes (Antarctica)

Concentrations of major ions, silicate and nutrients (total N and P) were measured in samples of surface water from 28 lakes in ice-free areas of northern Victoria Land (East Antarctica). Sixteen lakes were sampled during austral summers 2001/02, 2003/04, 2004/05 and 2005/06 to assess temporal variation in water chemistry. Although samples showed a wide range in ion concentrations, their composition mainly reflected that of seawater. In general, as the distance from the sea increased, the input of elements from the marine environment (through aerosols and seabirds) decreased and there was an increase in nitrate and sulfate concentrations. Antarctic lakes lack outflows and during the austral summer the melting and/or ablation of ice cover, water evaporation and leaching processes in dry soils determine a progressive increase in water ion concentrations. During the five-year monitoring survey, no statistically significant variation in the water chemistry were detected, except for a slight (hardly significant) increase in TN concentrations. However, Canonical Correspondence Analysis (CCA) indicated that other factors besides distance from the sea, the presence of nesting seabirds, the sampling time and percentage of ice cover affect the composition of water in Antarctic cold desert environments.

Assessing abundance and diversity patterns of soil microarthropod assemblages in northern Victoria Land (Antarctica)

This study aimed to: (1) assess differences between two quantitative sampling methods of soil microarthropods (visual census vs. stone washing) in ice-free areas located along a latitudinal gradient (from 72 degrees 37'S to 74 degrees 42'S) in northern Victoria Land (Antarctica); (2) furnish preliminary results on the abundance and diversity of mites and springtails in the studied areas. Visual census yielded reliable density estimates for adult collembolans and larger prostigmatic mites but did not detect small species. The study updates the distribution of several mites, including the southernmost record of an Oribatida species at global scale. Species composition was correlated with latitude but the uneven abundance distribution and local high beta-diversity probably reflect habitat fragmentation and population isolation. Under this circumstance nested sampling design should be usefully employed. Priorities and suitable methods for studying terrestrial microarthropod communities in continental Antarctica are discussed.

Maria Victoria Atencia: Legend of Myself

In this collection of 65 short poems, Roberta Quance exemplifies the range, vitality and mysticism of work by one of Spain’s foremost, if controversial, contemporary female poets, drawing on the contents of a number of Spanish collections.

The role of papyrus plants (Cyperus papyrus) and internal waves in the nutrient balance of Lake Victoria, East Africa

Dissertação mest., Gestão da água e da costa, Universidade do Algarve, 2007

Alessandro Baricco littérature, musique, peinture, cinéma, etc.

Dans l'oeuvre contemporaine d'Alessandro Baricco, des références de toutes sortes attirent l'attention de ceux et celles qui s'intéressent aux récits et romans de l'écrivain italien. De cette esthétique néo-baroque, c'est la rencontre avec d'autres formes d'art qui nous a ici interpelée. Autant sur le plan formel que thématique, les références à la musique, à la peinture et au cinéma, entre autres, offrent de remarquables exemples d'intermédialité. Cette diversité de disciplines convoquées dans le texte de Châteaux de la colère (1995), Soie (1997), Océan mer (1998), City (2001) et Novecento : pianiste (1997), constitue l'originalité forte de l'oeuvre de Baricco. Ces formes artistiques produisent une ambiance qui plonge le lecteur dans le domaine de l'art et accorde à l'auteur la possibilité de déployer avec une grande maîtrise de moyens et d'effets son style unique. Les renvois intermédiatiques relevant principalement des personnages soutiennent les propos de Baricco au sujet de l'art : ils permettent d'établir l'importance qu'accorde ce dernier au métalangage artistique et à la création sous toutes ses formes. Par là, il devient possible de mieux comprendre sa propre oeuvre littéraire qui valorise, au détriment de la prétention réaliste, une fantaisie ludique qui relève du spectaculaire. Le premier chapitre présente les procédés formels au service de la musicalité dans l'écriture de Baricco et les personnages de musiciens - ou en lien avec la musique - qui évoquent cette forme artistique privilégiée. Dans le deuxième chapitre, il est question des moyens techniques qui permettent aux textes de Baricco de rappeler l'art pictural ainsi que des personnages qui, par le truchement de la peinture, tiennent un discours sur la création artistique. Dans le troisième et dernier chapitre, nous nous intéressons à la structure romanesque qui, par diverses stratégies formelles, imite le scénario. Les personnages qui renvoient à l'art dramatique sont aussi abordés, de façon à tenir compte de la vision artistique qu'ils mettent en place. Enfin, la conclusion nous permet, à la lumière des informations recueillies, de relever les effets entrainés i.e. [entraînés] par ces jeux intermédiatiques. Celle-ci est aussi pour nous l'occasion de dégager, en son caractère unitaire, la vision artistique à l'oeuvre chez Baricco.

Osmolality of Elemental and Semi-Elemental Formulas Supplemented with Nonprotein Energy Supplements

Elemental and semi-elemental formulas are used to feed infants with short bowel syndrome, who may not be able to tolerate feeds of more than 310 mOsm kg(-1). The present study aimed to measure the osmolality of elemental and semi-elemental formulas at different concentrations, with and without the addition of nonprotein energy supplements.

Explicit ruin formulas for models with dependence among risks

We show that a simple mixing idea allows one to establish a number of explicit formulas for ruin probabilities and related quantities in collective risk models with dependence among claim sizes and among claim inter-occurrence times. Examples include compound Poisson risk models with completely monotone marginal claim size distributions that are dependent according to Archimedean survival copulas as well as renewal risk models with dependent inter-occurrence times.

Répertoire général pratique de notariat, de droit civil et fiscal et de formules d'actes : recueil périodique 1° de lois et décrets, avec commentaires ; 2° de jugements, arrêts, solutions, décisions, etc. ; 3° et de formules d'actes notariés : faisant suite au Traité-pratique et formulaire général du notariat / par A. Defrénois

1878 (T3,N2172)- (T3,N3883).

Répertoire général pratique de notariat, de droit civil et fiscal et de formules d'actes : recueil périodique 1° de lois et décrets, avec commentaires ; 2° de jugements, arrêts, solutions, décisions, etc. ; 3° et de formules d'actes notariés : faisant suite au Traité-pratique et formulaire général du notariat / par A. Defrénois

Etat de collection : retirages de 1877-1878

Répertoire général pratique de notariat, de droit civil et fiscal et de formules d'actes : recueil périodique 1° de lois et décrets, avec commentaires ; 2° de jugements, arrêts, solutions, décisions, etc. ; 3° et de formules d'actes notariés : faisant suite au Traité-pratique et formulaire général du notariat / par A. Defrénois

1877 (T2,N1073)- (T2,N2171).