1,721,008 research outputs found
Flora melífera de la región Andino-Norpatagónica argentina
No full textLa base de datos recopila las especies vegetales utilizadas por Apis mellifera como fuente de alimento en las provincias fitogeográficas Subantártica y Patagónica [1] de la región cordillerana del norte de la Patagonia argentina, con el fin de aportar a la investigación científica y al desarrollo de la apicultura local. Se reportan especies sobre las cuales se observó a Apis mellifera forrajeando polen y/o néctar (recursos florales), como también aquellas especies identificadas en análisis palinológicos y melisopalinológicos [2]. La información sistematizada para cada especie incluye taxonomía, origen, hábito y recurso floral que ofrece. Asimismo, se reportan las comunidades vegetales o ambientes en los cuales está presente cada una de las especies, y su fenología de floración con una resolución quincenal. Se detalla la totalidad de la literatura consultada de manera que la información sea completamente trazable. Se adjunta un glosario de nombres científicos y comunes de las especies vegetales.Fil: de Groot, Grecia Stefanía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Svampa, Suyai. Universidad Nacional de Río Negro. Sede Andina; ArgentinaFil: Aizen, Marcelo Adrian. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; ArgentinaFil: Schmucki, Reto. Uk Centre For Ecology & Hydrology; Reino UnidoFil: Morales, Carolina Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentin
An analytical framework for spatially targeted management of natural capital
No full textA major sustainability challenge is determining where to target management to enhance natural capital and the ecosystem services it provides. Achieving this understanding is difficult, given that the effects of most actions vary according to wider environmental conditions; and this context dependency is typically poorly understood. Here, we describe an analytical framework that helps meet this challenge by identifying both ‘why’ and ‘where’ management actions are most effective for enhancing natural capital across large geographic areas. We illustrate the framework’s generality by applying it to two examples for Britain: pond water quality and invasion of forests by rhododendron
Demography and pollination ecology of «Trillium grandiflorum» in hedgerow corridors and forest patches
No full textHedgerows are assumed to provide suitable habitats and dispersal corridors in agricultural landscapes for forest herbs, but these functions have rarely been tested. Assuming that hedgerows can sustain viable populations solely from vegetation survey can be misleading since it does not take into account extinction lag and demographic processes. I address the question of hedgerow's suitability for forest herbs by comparing the demography and pollination biology of Trillium grandiflorum in hedgerow corridors and forest patches of an agricultural landscape. Specifically I ask: Do population structure and individual performance of T. grandiflorum differ between hedgerows and forests? Are pollination services comparable in hedgerows and forests? How do variations in growth, survival, and reproduction influence demography in hedgerows and forests? Individual plant performance and population structure was determined from field observations and experiments conducted in a system of hedgerows connected to forests. I conducted pollination and transplantation experiments to test for variation in pollination and reproduction among habitats and with increasing isolation. Populations monitored for three years in hedgerows and forests were used to construct transition matrix models and to compare their dynamics. Populations in hedgerows were characterized by lower proportion of seedling and juvenile per mature plant, but also by better flower and ovule production than in forests. Pollen limitation was comparable between habitats, suggesting that pollination services in hedgerows are at least as good as in forests. Pollination varied at the landscape scale and over time, and declined wiPrésumer que les haies peuvent servir de corridors de dispersion et contenir des populations d'herbacées forestières viables sur la seule base d'inventaires de la végétation peut être biaisé puisque ceux-ci ne tiennent pas compte du délai d'extinction ni des processus démographiques. J'aborde la question de la qualité des haies en tant qu'habitat en comparant la démographie et la pollinisation de Trillium grandiflorum dans des haies et des forêts. Est-ce que la structure des populations et la performance individuelle diffèrent dans les haies des forêts? Est-ce que les services de pollinisation sont comparables entre haies et forêts? Comment des variations dans la croissance, la survie, et la reproduction influencent la démographie dans chacun de ces habitats? La performance individuelle et la structure des populations ont été dérivées d'observations et d'expériences effectuées en haies et en forêts. Des expériences de pollinisation et de transplantation ont été utilisées pour tester les effets d'habitats et d'isolement sur la pollinisation et la reproduction. Des suivis, effectués en haies et en forêts, durant trois ans ont servi à construire des matrices de transitions et comparer la dynamique des populations. Dans les haies, les semis et les juvéniles sont retrouvés en moins grandes proportions, bien que la production de fleurs et d'ovules y soit plus élevée qu'en forêt. La limitation de pollen ne diffère pas, suggérant que la pollinisation dans les haies est équivalente à celle des forêts. La pollinisation varie à l'échelle des paysages et du temps, ainsi qu'avec l'isolement. La faible survie des premiers stades affecte né
Dynamique spatio-temporelle des réseaux de haies de trois paysages agricoles du sud-ouest du Québec
Full text linkMémoire numérisé par la Direction des bibliothèques de l'Université de Montréal
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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