Dangers and opportunities in managing temporary ponds

Although there is a growing awareness of the value of temporary ponds in Europe, there is still remarkably little information available to help guide their conservation and management. General principles which can be used to guide the management of temporary ponds as a whole have yet to be established. The aim of this article, therefore, is to give a broader overview of the main principles of temporary pond conservation, particularly by building on a number of general principles for managing ponds previously described by Biggs et al. (1994) and Williams et al. The authors emphasise the importance of surveys in order to get data on which to base management strategies. The main principles of temporary pond management are described, and examples of three case studies of ponds in England are given.

Creation of temporary ponds for amphibians in northern and central Europe

More than 4000 ponds have been created or restored in Denmark since 1985 as part of a large-scale pond-digging programme to protect endangered amphibians in particular and pond flora and fauna in general. Most ponds are created on private land with public financing. The programme was triggered by, among other factors, a drastic decline in amphibian populations in Denmark between 1940 and 1980. However, in recent years there has been an increased awareness in Denmark that temporary ponds are important for the conservation of some of the most rare amphibian species, such as fire-bellied toad Bombina bombina, natterjack toad Bufo calamita and green toad Bufo viridis. Other rare species such as moor frog Rana arvalis and European tree frog Hyla arborea also benefit from temporary ponds. The last 15 years of work on the conservation of endangered species and their habitats has resulted in a last-minute rescue and a subsequent growth in the size of most Danish populations of fire-bellied toad and green toad; some populations of the relatively more common natterjack toad have also increased. The creation of temporary ponds plays an important role in the success of these three species. The creation of ponds to help restore viable populations of the most rare amphibians has not been easy. To study the conditions that may need to be created, Danish herpetologists searched for areas with temporary ponds that had good water quality, natural hydrological conditions and a management regime influenced by traditional agricultural methods. The paper gives an overview of pond creation and restoration projects in Denmark and Poland and their significance for amphibian diversity.

Agentes Comunitários de Saúde: trabalho e formação profissional numa perspectiva emancipatória

Este estudo tem por objeto a trajetória profissional e de escolarização do Agente Comunitário de Saúde (ACS), entendendo a escolarização como um processo de avançar no aprendizado dentro da escola formal e não apenas na formação profissional. Entende-se o trabalho como um princípio emancipatório, mas ao mesmo tempo repleto de contradições e, ainda, campo de exploração, na lógica do modelo de acumulação em curso. O objetivo geral do estudo é descrever e discutir a trajetória de trabalho, formação e escolarização dos Agentes Comunitários de Saúde inseridos na Área Programática 5.2 (AP 5.2). O estudo apresenta uma abordagem qualitativa, com base nas narrativas sobre o trabalho e vida dos ACS e o método de análise dos dados foi de base interpretativa com apoio do referencial da Hermenêutica-Dialética. Além disso, foi obtido um perfil quantitativo de escolaridade de todos os ACS. O campo da pesquisa foi a AP 5.2, no município do Rio de Janeiro. Os resultados evidenciam ampliação significativa em todas as faixas de escolaridade desses ACS após o início do trabalho. As razões apontadas para o ingresso no trabalho de ACS estão relacionadas à oportunidade de ingresso ou reingresso no mercado formal de trabalho e a proximidade da residência. A desvalorização e a falta de reconhecimento são apontadas como os principais motivos para os ACS deixarem a profissão. Alguns sujeitos apontaram como provisório o trabalho de ACS e sua permanência está vinculada a falta de outras perspectivas e também a sua identificação com o trabalho comunitário, remetendo a um caráter de dádiva. O princípio emancipatório do trabalho também foi apontado por alguns sujeitos, já que o trabalho propiciou a retomada de antigos objetivos, no caso, voltar a estudar. Também foram encontrados achados da influência do enfermeiro no trabalho do ACS e na sua opção profissional. Parece haver um desejo deste trabalhador em mudar de função, porém continuando na área da saúde, mas a garantia dessa mudança só será possível com uma ordem social mais justa. Com base nos resultados e no referencial teórico, conclui-se que o ACS deve ser olhado não apenas como um trabalhador que reproduz um modelo de relação de trabalho, mas que, como membro das classes populares, permite pensar mudanças a partir do conceito de inédito viável. Sua permanência como ACS e a garantia de que se cumpra a proposta de mudança indicada pela Estratégia de Saúde da Família (ESF) depende do reconhecimento técnico e político desse trabalhador.

Comparison of permanent and temporary streams of calcareous Provence [Translation from: Annales de Limnologie 9(3) 273-292, 1973]

The rainfall regime and the karstic nature of the subsoil determines the alternation of a period of flow and a period of drought for a large number of Mediterranean streams. Amongst this type of stream it is possible to distinguish temporary streams, characterised by a period of flow for several months permitting the establishment of the principal groups of aquatic insects; and ephemeral streams whose very brief period of flow permits the establishment of a community reduced to a few species of Diptera. This paper aims to study the structure of the communities which colonise this particular type of stream and the ecology of the principal species which constitute these communities. Four French temporary streams were examined and temperature regimes, dissolved oxygen, calcium and magnesium measured. Samples of fauna were taken regularly and the biotic composition established. The analysis of similarities between the three permanent streams are discussed and compared with permanent streams.

Recolonisation of temporary streams and evolution of a degree of stability of the zoocenose [Translation from: Ecologia Mediterranea No.1 149-164, 1976]

When flow returns to a temporary stream a certain number of plant and animal species establish themselves more or less rapidly on the stream-bed constituting the initial phase of evolution of the re-population. This phase is essentially characterised by the ”awakening” of animal species that passed the dry season in a dormant state and by the development of the first unicellular algae that constitute the periphyton. Then they are succeeded by more or less stable animal groups and the structural complexity increases. The authors of the present study aim to analyse the dynamics of community succession from the return of water to the biotope until its drying up. It is attempted to determine the influence of the duration of flow on this evolution. This work is based on the analysis of population diversity with reference to its two complementary aspects, species richness and equitability. The River Destel which was studied for this project is situated in the Gorge of Ollioules near the town of Toulon.

Acoustic tracking of reef fishes to elucidate habitat utilization patterns and residence times inside and outside marine protected areas around the island of St. John, USVI

This technical memorandum describes a developing project under the direction of NOAA’s Biogeography Branch in consultation with the National Park Service and US Geological Survey to understand and quantify spatial patterns and habitat affinities of reef fishes in the US Virgin Islands. The purpose of this report is to describe and disseminate the initial results from the project and to share information on the location of acoustic receivers and species electronic tag ID codes. The Virgin Islands Coral Reef National Monument (VICRNM), adjacent to Virgin Islands National Park (VIIS), was established by Executive Order in 2000, but resources within the monument are poorly documented and the degree of connectivity to VIIS is unknown. Whereas, VICRNM was established with full protection from resource exploitation, VIIS has incurred resource harvest by fishers since 1956 as allowed in its enabling legislation. Large changes in local reef communities have occurred over the past several decades, in part due to overexploitation. In order to better understand the habitat utilization patterns and movement of fishes among management regimes and areas open to fishing around St, John, an array of hydroacoustic receivers was deployed while a variety of reef fish species were acoustically tagged. In July 2006, nine receivers with a detection range of ca. 350 m were deployed in Lameshur Bay on the south shore of St. John, within VIIS. Receivers were located adjacent to reefs and in seagrass beds, inshore and offshore of these reefs. It was found that lane snappers and bluestriped grunts showed diel movement from reef habitats during daytime hours to offshore seagrass bed at night. Timing of migrations was highly predictable and coincided with changes in sunrise and sunset over the course of the year. Fish associated with reefs that did not have adjacent seagrass beds made more extensive movements than those fishes associated with reefs that had adjacent seagrass habitats. In April 2007, 21 additional receivers were deployed along much of the south shore of St. John (ca. 20 km of shoreline). This current array will address broader-scale movement among management units and examine the potential benefits of the VICRNM to provide adult “spillover” into VIIS and adjacent harvested areas. The results from this work will aid in defining fine to moderate spatial scales of reef fish habitat affinities and in designing and evaluating marine protected areas.

IGBT series connection under Active Voltage Control with temporary clamp

This paper presents the use of an Active Voltage Control (AVC) technique for balancing the voltages in a series connection of Insulated Gate Bipolar Transistors (IGBTs). The AVC technique can control the switching trajectory of an IGBT according to a pre-set reference signal. In series connections, every series connected IGBT follows the reference and so that the dynamic voltage sharing is achieved. For the static voltage balancing, a temporary clamp technique is introduced. The temporary clamp technique clamps the collector-emitter voltage of all the series connected IGBTs at the ideal voltage so that the IGBTs will share the voltage evenly. © 2012 IEEE.

A module-based approach to foster and document the intercultural process before and during the residence abroad.

This article contributes to the debate on what form of preparation and support can enhance the intercultural student experience during the Year Abroad. It presents a credit-bearing and multi-modal module at a UK university designed to both prepare students prior to departure through a series of workshops and activities on an e-portfolio and help them engage in meta-reflection on intercultural issues during their stay. The presentation of the curricular components of the course and instances extracted from student blogs are contextualised within theoretical considerations on intercultural education and a holistic approach to student development. The longitudinal evolution of the module is presented in the context of an iterative approach leading to a cycle of revisions and amendments. With its pragmatic stance this article aims to address one of the concerns recently expressed about intercultural education, namely that although intercultural theories are suitably incorporated in the latest thinking on communicative competence, there is a lack of evidence-based practice.

Qubit Residence Time Measurements with a Bose-Einstein Condensate

We show that an electrostatic qubit located near a Bose-Einstein condensate trapped in a symmetric double-well potential can be used to measure the duration the qubit has spent in one of its quantum states. The strong, medium, and weak measurement regimes are analyzed. The analogy between the residence and the traversal (tunnelling) times is highlighted.

Area of residence and alcohol-related mortality risk: a five-year follow-up study

Aims