1,721,100 research outputs found

    Tolerance landscapes can be used to predict species-specific responses to climate change beyond the marine heatwave concept: Using tolerance landscape models for an ecologically meaningful classification of extreme climate events

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    To predict the responses of organisms to changes in intensity and frequency of heatwaves, it is essential to gain a thorough understanding of how organisms respond to temperature exposure. Species-specific curves are more informative, yet more difficult to ascertain, than the generic heatwave definition (five days or more at a temperature above the 90% percentile) when addressing mortality risk and should be included when predicting thermal risks. The thermal tolerance of organisms is dictated by a combination of exposure intensity and duration: the aim of this study was to build a ‘tolerance landscape’ model, based on exposure thresholds to a potentially stressful temperature range, for the commercially important clam Ruditapes philippinarum using ten years of summer temperature time series in four lagoons in the Northern Adriatic, where this species is being commercially farmed. The model is based on a log-linear relationship between LT50 and exposure time. The two model parameters, i.e. the lethal temperature at 1 min exposure (CTmax), and the temperature sensitivity parameter (z) were estimated on the basis of a systematic literature search. Best-fitting values, i.e. CTmax = 54.5 (±2.3) and z = - 5.72 ◦C (±0.66) are within the ranges found for other bivalves. Results show that the mortality threshold was exceeded for most lagoons in summertime in 2015, 2017 and 2018 suggesting that the risk of exceeding the mortality threshold is increasing, due to an increase in frequency and duration of extreme temperature events. Comparisons with the generic ‘marine heatwave’ definition showed that, while in some occasions ‘heatwaves’ occurred that were not risky for R. philippinarum, in one case the model identified a time period of mortality risk that would not have been classified under the generic ‘heatwave’ definition. These mismatches suggest that tolerance curves can be a good addition to productivity and site selection models, incorporating a metric of species-specific risk that can be used to predict the consequences of climate change on fishery and aquaculture, and can find their place in conservation and restoration toolkits for forecasting changes in habitat suitability under future climate scenarios

    L’Ordinanza 172/2020 e la valutazione nella scuola primaria: la proposta di un modello di ricerca-formazione

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    The Ministerial Decree 172/2020, that replaced numerical grades with a descriptive judgment, has produced an important change in the evaluation methods used in primary schools. The ministerial guidelines underline the formative character of assessment, and set as its object the learning process, examined through 4 dimensions: situation, resources, autonomy, and continuity. From the point of view of educational research and didactics, there is substantial reference to elements and processes such as formative evaluation, socio-constructivist teaching and the practice of observation. The Ministerial Decree represents a challenge for schools, including in terms of the need for specific training. This paper proposes to schools a research-training path, which has been developed through teachers’ involvement in seminars, laboratories and collaborative research projects

    Digital Storytelling for Education. Theories and Good Practices in Preschool

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    The Digital Storytelling combines the old art of telling stories with new media such as graphics, audio and video. This book introduces Digital Storytelling as a realistic and feasible opportunity for Pre-schools, useful to achieve a dual objective: on the one hand, it fosters children’s narrative and media literacy competencies, and on the other it supports teachers’ professional development in media education. The first part of the book presents Digital Storytelling by exploring its pedagogical and didactical dimensions. The second part examines nineteen different digital storytelling practices in order to outline the most relevant educational aspects of Digital Storytelling activities carried in Pre-schools

    Lesson Study in matematica per la trasposizione di pratiche didattiche dal museo alla scuola

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    A Reggio Emilia sono in corso dall’ a.s. 2020-21 sperimentazioni sulla scuola ai Musei Civici. Per i docenti la relazione quotidiana ed immersiva con un ambiente di apprendimento/luogo di incontro con i reperti, in dialogo tra discipline e l’osservazione di modalità di insegnamento non formali, multimodali e interdisciplinari, offre opportunità di riflessione su modelli didattici. Da osservazioni e focus group svolti dal gruppo di ricerca Unimore è emersa, insieme alle consapevolezze sul valore educativo ed estetico dell’esperienza, l’idea che questa didattica si possa fare solo al museo, perché l’interdisciplinarità e ricchezza di stimoli sarebbero caratteristiche del luogo e non trasferibili. Quali accorgimenti formativi ed organizzativi, invece, possono favorire la trasposizione di pratiche didattiche dal contesto non formale a quello formale? Partendo dal quadro teorico della trasposizione culturale si è svolto un ciclo di LS, in collaborazione tra scuola, Musei Civici e Unimore, sulle tassellazioni, per trovare risposte preliminari. Vedremo come progettazione e riprogettazione della lezione, da parte di docenti, educatori museali e ricercatori attorno ad alcuni reperti museali, diventa spunto per decostruire la risposta per ripensarla, e trasporla dal museo alla scuola. Questo passaggio riflessivo corale svolto in contesto disciplinare è servito a creare nuove consapevolezze generali sulla trasposizione dal formale al non formale

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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