Magnetic properties contribution to the identification and provenance of marine sediments: distal IRD in the Galicia Interior Basin (NW Spain)

This paper discusses the advantages of using a combined environmagnetic and geochemical approach to the provenance and characterization of distal IRDs occurring during the Last Glacial Period in core CI12PC3 from the Galicia Interior Basin (GIB). Six Heinrich layers (HL1-6) have been identified in the area in base to the detection of distinct populations of exotic magnetic mineral assemblages alien to the local/regional sedimentation environment. Their extension has been determined by Ca/Sr and Si/Sr ratios and their provenance by 143Nd/144Nd and 87Sr/86Sr isotopic ratios and FORCs. The sedimentary expression of HL is characterized by the presence of distal Ice Rafted Detritus (IRD). Distal IRD magnetic signatures in the GIB consist of (i) an increase of one order of magnitude in the peak amplitude of magnetic susceptibility from background values, (ii) a general coarsening of the magnetic grain size in a mineral assemblage dominated by titano-magnetites, (iii) FORC distributions pushing towards the coarse MD or PSD component, and (iv) thermomagnetic curves depicting the occurrence of several magnetite phases. These four features are very different from the fine-grained biogenic magnetic assemblages characterized by the combination of lower MS and higher coercivity values that dominate the predominant mixtures of the non-interacting SSD and PSD components in the non-IRD influenced background sedimentation. Our results show that the last 70.000 yr of sedimentation in the GIB were controlled by the relative contribution of local detrital material derived from the Iberian Variscan Chain and IRD alien material from the iceberg melting during the Heinrich Events. They also show two main IRD provenance fields: Europe and Canada. And that the later is more important for for HL1, HL2, HL4 and HL5. FORCs analysis complemented the isotopic information and provided a very unique information, indicating that glacial flour may not always have the same provenance as IRD and that ice-melted derived suspended sediment has its own dynamics and may reach further and/or persists longer than IRD.

Erziehungsklima, intergenerative Transmission und Sozialisation von Jugendlichen in türkischen Migrantenfamilien

Der Beitrag stellt empirische Befunde aus einer standardisierten Befragung von je 200 Mutter-Tochter- und Vater-Sohn-Dyaden in türkischen Migrantenfamilien dar, die in zwei sehr unterschiedlichen Erhebungskontexten (West-Berlin und Oberschwaben) gewonnen wurden. In einem Kohortenvergleich wird zunächst die hohe Persistenz familiärer Werte sowohl in der Türkei als auch bei Migranten der ersten und zweiten Zuwanderungsgeneration festgestellt. In der sich anschließenden Analyse der Wahrnehmungen, Einstellungen und Verhaltensweisen von türkischen Migranten-Müttern und -Vätern einerseits und ihren jugendlichen Töchtern bzw. Söhnen andererseits wird das Ausmaß der Übereinstimmung in den (gleichgeschlechtlichen) Dyaden untersucht. Dabei kann die intergenerative Transmission von Werten und Einstellungen, insbesondere was die Leistungs- und Aufstiegserwartungen anbetrifft, bei beiden Geschlechtern als ein bedeutsamer Faktor der Sozialisation in der Migrations- und Minoritätssituation identifiziert werden. (DIPF/Orig.)

Die Vereinbarkeit von Beruf und Familie als weibliches Lebenskonzept: eingewanderte und westdeutsche Frauen im Vergleich

Der Beitrag behandelt das Thema der Vereinbarkeit von Familie und Beruf aus der Perspektive von drei verschiedenen Gruppen von Frauen: Einwanderinnen/Arbeitsmigrantinnen aus der Türkei, Aussiedlerinnen aus der ehemaligen Sowjetunion und westdeutsche Frauen. Berichtet wird über Ergebnisse der Hauptuntersuchung eines derzeit laufenden empirischen Projektes. Obwohl sich das Problem der Vereinbarkeit im allgemeinen als ein frauenspezifisches Problem darstellt, wird seine Lösung von den drei befragten Gruppen von Frauen unterschiedlich gehandhabt. Dies wird sowohl auf die jeweilige soziale Stellung der Befragten in der BRD als auch auf die jeweilige Situation der Einwanderinnen in Beruf und Familie im Herkunftskontext zurückgeführt. (DIPF/Orig.)

Lehrererwartungen und Ethnizität. Innerschulische Chancendeterminanten bei Migrantenschülern in den Niederlanden

Der Autor legt dar, daß es in den Niederlanden immer noch eine indirekt von ständischen Prinzipien bestimmte Schule gibt, in der die soziale Herkunft der Schüler das Lehrerverhalten bestimmt und an den Schüler je nach Schichtzugehörigkeit unterschiedliche Anforderungen gestellt werden. Der Beitrag untersucht aber auch die Rolle des Faktors Ethnizität bei der Behandlung und Beurteilung von Schülern. Die Arbeit ist Teil einer größeren Repräsentativstudie, die an 44 niederländischen Grundschulen mit einem hohen Anteil von Migrantenschülern durchgeführt wurde. In der Untersuchung erwies sich die Schichtzugehörigkeit der Schüler als bedeutsamer als die ethnische Zugehörigkeit. Das hat auch Konsequenzen für pädagogische Maßnahmen. (DIPF/Orig.)

The fisheries of the Kyoga lakes and the likely impact on them by human activities in the catchment

A review of the historical development of the fishery resources of the Kyoga basin shows that the fishery based on the alien fishes which surplanted the indigenous species in the 1960's and early 1970's has been evolving. The record catches of the 19705 and early 1980's were mainly influenced by increased nutrient supply and enlarged lake volume. The sudden collapse in the fishery particularly of the Nile perch in the mid 1980's was most probably imposed by bad fishing regimes. However, future trends in the fisheries of the Kyoga basin will most likely be controlled by nutrient availability and dynamics as well as by the impact of mans activities in the Kyoga catchment.

Sistematics, population genetics, propagation and conservation of Picconia azorica (Tutin) Knobl. (Oleaceae)

Tese de Doutoramento, Biologia (Ecologia Vegetal), 24 de Junho de 2013, Universidade dos Açores.

Status of kariba weed (Salvinia molesta) infestation, its impacts and control options on Uganda’s water systems

Kariba weed (Salvinia molesta) is an invasive alien waterweed that was first recorded in Uganda in sheltered bays of Lake Kyoga in June 2013. This waterweed has become a common feature on Lake Kyoga and its associated rivers, streams and swamps, and has spread to other lakes notably Kwania and Albert in addition to Lake Kimira in Bugiri district.

Frida Kahlo: "Pata de palo"

Escogí trabajar la biografía de Frida buscando respuestas a mi vida, justificaciones al dolor humano, las rupturas, la muerte. Ella perteneció a una época cargada de sentidos, exhuberante en motivos y quehaceres, personajes, culturas, rabias y desafíos, y yo estoy en otra que me ha arrancado con violencia los porqués y me tiene colgada del punto con el que concluye el signo de interrogación de mi existencia, ambas profundamente dolorosas.He leído sobre ella "en búsqueda" como cuando abro la Biblia en los Salmos, me recorro la ira de Job, la historia de Ruth, Salomé o Magdalena, como leo a Sor Juana, Juana de Ibarbourou o Dulce María Loynás, igual los cuentos cortos de Cortázar o las "Cotidianas" de Benedetti y también cuando nada más necesito ver la luna o quedarme quieta, sin preguntas, frente a mi imagen tan propia y tan ajena.

Comércio de répteis exóticos: as suas implicações para a conservação da natureza

O comércio de espécies selvagens tem crescido bastante ao longo das últimas décadas. Atualmente é considerado o quarto maior tráfico ilegal no mundo, logo seguido da transação de drogas, de armas e de humanos. Estima-se que o comércio de espécies selvagens pode ultrapassar os 12 milhões de euros por ano na UE. Abrange tanto as plantas como os animais vivos; mas, nestes últimos, incluem-se também os seus derivados, tais como sejam as peles, os ossos, alimento, entre outros. O uso das espécies selvagens é bastante vastos, as espécies são utilizadas para alimentação, uso medicinal, investigação científica, comércio de peles, alimentação e o mais comum é para animais de estimação. As espécies exóticas muitas vezes tornam-se espécies exóticas invasoras, começam a ser um perigo para a biodiversidade e para as espécies nativas. O processo de invasão apresenta-se por quatro fases: dispersão ou transporte, estabelecimento, naturalização e por fim dispersão geográfica e/ou invasão. Vários são os mecanismos para combater as espécies exóticas invasoras, sendo que o mecanismo mais radical a erradicação de espécimes. Em Lisboa, estão descritas três espécies exóticas invasoras: a tartaruga da Florida Trachemys scripta, a tartaruga de Nelson Pseudemys nelsoni e a tartaruga corcunda do Mississipi Graptemys pseudogeographica; ABSTRACT: The wildlife trade is growing fast over the last decades. It is now considered the fourth largest illegal trade in the world, followed by the drugs, weapons and humans. It is estimated that trade with species can exceed 12 million € per year in the EU. This trade comprises plants or live animals; but also is derivatives, such as skins, bones, food, and others. The use of wildlife is diverse, can be for food, medical, scientific research, trade of skins, but the most common is for pets. Alien species can become invasive alien species and so they become a threat to biodiversity and for native species. The process of invasion has four phases: dispersion or transport, establishment, naturalization and geographic dispersion and/or invasion. There are several mechanisms to combat such invasive alien species: the most radical mechanism is eradication of specimens. In Lisbon, are described three invasive alien species: the red-eared slider turtle Trachemys Florida, the Florida red-bellied turtle Pseudemys nelsoni and the false map turtle Graptemys psedogeographica.

Natureza e arte. Leituras de Píndaro

Dissertação de dout. em Literatura (Literatura e Cultura Clássicas), Faculdade de Ciências Humanas e Sociais, Univ. do Algarve, 2005

“Step by step”: high frequency short-distance epizoochorous dispersal of aquatic macrophytes

Aquatic macrophytes can successfully colonise and re-colonise areas separated by space and time. The mechanisms underlying such “mobility” are not well understood, but it has often been hypothesised that epizoochory (external dispersal) plays an important role. Yet, there is only limited, and mostly anecdotal, evidence concerning successful epizoochorous dispersal of aquatic macrophytes, particularly in the case of short-distance dispersal. Here we examine in situ and ex situ dispersal of aquatic macrophytes, including three invasive alien species. A high frequency of Lemna minor Linnaeus dispersal was observed in situ, and this was linked to bird-mediated epizoochory. We concluded that wind had no effect on dispersal. Similarly, in an ex situ examination Lemna minuta Kunth and Azolla filiculoides Lamarck, were found to be dispersed with a high frequency by mallard ducks (Anas platyrhynchos). No dispersal was measured for Elodea nuttalli (Planchon) H. St. John. It is concluded that short-distance or “stepping-stone” dispersal via bird-mediated epizoochory can occur with high frequencies, and therefore can play an important role in facilitating colonisation, range expansion and biological invasion of macrophytes.

La migración infantil indocumentada de Centroamérica, un desafío a la reformulación de la política migratoria de Estados Unidos. Estudio de caso de Honduras (2010-2014)

El siguiente estudio de caso analiza la influencia de la llegada de la migración infantil indocumentada centroamericana en la reformulación de la política migratoria de Estados Unidos en el período 2010-2014. Enfocándose en el caso de Honduras para dar a conocer y analizar las causas que crean las dinámicas migratorias por parte de los menores, este trabajo analiza como la llegada de estas poblaciones genera ciertos efectos en el proceso de toma de decisión de las políticas internas de los Estados Unidos. Por un lado, para resaltar las características del fenómeno migratorio, se utilizan las teorías de redes sociales y la teoría push and pull. Por otro, mediante los conceptos de Sensibilidad y Vulnerabilidad expuestos en la teoría de la Interdependencia Compleja de las Relaciones Internacionales, como también el concepto de Seguridad Societal propuesto por Barry Buzan se estudia el nivel de influencia del fenómeno infantil en el gobierno norteamericano.

Latinos nos Estados Unidos: Barreiras Culturais, Sociais e Linguísticas Insuperáveis?

Este trabalho examina produções literárias de escritores(as) Latinos(as) nos Estados Unidos mormente no tocante ao profundo sentimento de que há barreiras aparentemente intransponíveis  no cotidianos dos imigrantes de origem latina. Por meio de análises de textos de Julia Alvarez, Pedro Pietri, Pat Mora, Gloria Anzaldúa, Gustavo Pérez-Firmat são abordadas  barreiras culturais, sociais e linguísticas determinantes para a manutenção desse grupo em condições precárias de sobrevivência, vivendo do contínuo apoio do welfare state.  A escrita dessas vozes silenciadas no passado traz à luz a tentativa de rompimento de estereótipos e de preconceitos que não têm mais fundamento em relação à conduta social e ao trabalho desses imigrantes nos Estados Unidos.