Variation in the dispersal potential of non-feeding invertebrate larvae: the desperate larva hypothesis and larval size

For many species of marine invertebrates, variability in larval settlement behaviour appears to be the rule rather than the exception. This variability has the potential to affect larval dispersal, because settlement behaviour will influence the length of time larvae are in the plankton. Despite the ubiquity and importance of this variability, relatively few sources of variation in larval settlement behaviour have been identified. One important factor that can affect larval settlement behaviour is the nutritional state of larvae. Non-feeding larvae often become less discriminating in their 'choice' of settlement substrate, i.e. more desperate to settle, when energetic reserves run low. We tested whether variation in larval size (and presumably in nutritional reserves) also affects the settlement behaviour of 3 species of colonial marine invertebrate larvae, the bryozoans Bugula neritina and Watersipora subtorquata and the ascidian Diplosoma listerianum. For all 3 species, larger larvae delayed settlement for longer in the absence of settlement cues, and settlement of Bugula neritina larvae was accelerated by the presence of settlement cues, independently of larval size. In the field, larger W subtorquata larvae also took longer to settle than smaller larvae and were more discriminating towards settlement surfaces. These differences in settlement time are likely to result in differences in the distance that larvae disperse in the field. We suggest that species that produce non-feeding larvae can affect the dispersal potential of their offspring by manipulating larval size and thus larval desperation.

Redes de inovação em pequenas e médias empresas: um estudo de caso no setor têxtil

Dissertação de mestrado em Engenharia Industrial

La escuela abierta a la vida.

Pretende que el alumnado de integración o con problemas de aprendizaje consiga el dominio elemental de las áreas instrumentales por medio de actividades fundamentalemente manipulativas. Los objetivos son: desarrollar capacidades manipulativas, psicomotoras, intelectuales y afectivas, fomentar la creatividad, potenciar la autoestima, desarrollar y fomentar la expresión oral y escrita, recuperar las áreas instrumentales básicas, favorecer la inserción laboral por medio de la orientación personal y vocacional y realizar adaptaciones que faciliten la compensación y la atención a la diversidad. Las actividades se desarrollan en : huerto escolar, taller de radio y mundo de la imagen, taller de carpintería y electricidad y taller de pequeñas reparaciones y mantenimiento. Se evalúa el grado de consecución de los objetivos a través del debate y la reflexión conjunta.

Pautas y registros de observación y evaluación. Segundo ciclo de educación primaria.

El cuaderno es un instrumento que trata de facilitar la tarea de sistematizar la observación y de evaluar los procesos de aprendizaje de l@s niñ@s. Su configuración facilita un registro individualizado de los procesos de aprendizaje de cada niñ@ y, a la vez, una visión global del conjunto del grupo que puede ayudar a atender a la diversidad y permite hacer un seguimiento detallado del progreso de cada alumn@. Se incluyen los objetivos y contenidos prescriptivos determinados por el MEC y, además, se ha tomado como referencia la distribución por ciclos que propone el mismo Ministerio en las 'cajas rojas'.

Network for Cooperation in Integrated Water Resource Management for Sustainable Development in Latin America and the Caribbean No. 26

Editorial remarks.-- Open discussion: Formulation of new regulatory frameworks for water supply and sanitation services ; The problem of provision of public goods.-- News of the network: Matanza-Riachuelo River basin authority, Argentina ; Venezuelan water law.-- Meetings: Fifth Brazilian Congress on Regulation ; Experience of water management in the Southern Cone.-- Courses: Course on international investment agreements, water and public services.-- Internet and WWW news

Tropopause level Rossby wave breaking in the Northern Hemisphere: a feature-based validation of the ECHAM5-HAM climate model

Breaking synoptic-scale Rossby waves (RWB) at the tropopause level are central to the daily weather evolution in the extratropics and the subtropics. RWB leads to pronounced meridional transport of heat, moisture, momentum, and chemical constituents. RWB events are manifest as elongated and narrow structures in the tropopause-level potential vorticity (PV) field. A feature-based validation approach is used to assess the representation of Northern Hemisphere RWB in present-day climate simulations carried out with the ECHAM5-HAM climate model at three different resolutions (T42L19, T63L31, and T106L31) against the ERA-40 reanalysis data set. An objective identification algorithm extracts RWB events from the isentropic PV field and allows quantifying the frequency of occurrence of RWB. The biases in the frequency of RWB are then compared to biases in the time mean tropopause-level jet wind speeds. The ECHAM5-HAM model captures the location of the RWB frequency maxima in the Northern Hemisphere at all three resolutions. However, at coarse resolution (T42L19) the overall frequency of RWB, i.e. the frequency averaged over all seasons and the entire hemisphere, is underestimated by 28%.The higher-resolution simulations capture the overall frequency of RWB much better, with a minor difference between T63L31 and T106L31 (frequency errors of −3.5 and 6%, respectively). The number of large-size RWB events is significantly underestimated by the T42L19 experiment and well represented in the T106L31 simulation. On the local scale, however, significant differences to ERA-40 are found in the higher-resolution simulations. These differences are regionally confined and vary with the season. The most striking difference between T106L31 and ERA-40 is that ECHAM5-HAM overestimates the frequency of RWB in the subtropical Atlantic in all seasons except for spring. This bias maximum is accompanied by an equatorward extension of the subtropical westerlies.

De Gaulle and Europe: Historical Revision and Social Science Theory. Program for the Study of Germany and Europe Working Paper Series 8.5

The thousands of books and articles on Charles de Gaulle's policy toward European integration, whether written by historians, social scientists, or commentators, universally accord primary explanatory importance to the General's distinctive geopolitical ideology. In explaining his motivations, only secondary significance, if any at all, is attached to commercial considerations. This paper seeks to reverse this historiographical consensus by examining the four major decisions toward European integration during de Gaulle's presidency: the decisions to remain in the Common Market in 1958, to propose the Foucher Plan in the early 1960s, to veto British accession to the EC, and to provoke the "empty chair" crisis in 1965-1966, resulting in the "Luxembourg Compromise." In each case, the overwhelming bulk of the primary evidence-speeches, memoirs, or government documents-suggests that de Gaulle's primary motivation was economic, not geopolitical or ideological. Like his predecessors and successors, de Gaulle sought to promote French industry and agriculture by establishing protected markets for their export products. This empirical finding has three broader implications: (1) For those interesred in the European Union, it suggests that regional integration has been driven primarily by economic, not geopolitical considerations--even in the "least likely" case. (2) For those interested in the role of ideas in foreign policy, it suggests that strong interest groups in a democracy limit the impact of a leader's geopolitical ideology--even where the executive has very broad institutional autonomy. De Gaulle was a democratic statesman first and an ideological visionary second. (3) For those who employ qualitative case-study methods, it suggests that even a broad, representative sample of secondary sources does not create a firm basis for causal inference. For political scientists, as for historians, there is in many cases no reliable alternative to primary-source research.

Valoración de los deberes y derechos docentes y de la comunidad educativa por las familias

El presente trabajo tiene como objetivo principal conocer el grado de aceptación que tienen los deberes y derechos docentes y de la comunidad educativa entre las madres y padres que tienen hijos escolarizados en institutos y colegios. Se trata de una investigación descriptiva. Como instrumento de evaluación se ha empleado el cuestionario “Deberes y derechos del profesorado en la comunidad educativa”. En los resultados se demuestra que las madres y los padres consideran muy importantes los deberes y derechos presentados, sin que se observen diferencias significativas en función de la titularidad de los centros educativos, el cargo que ostentan en la asociación, la edad o el género de los participantes.