1,721,177 research outputs found
River Habitats for Coarse Fish: How Fish Use Rivers and How We Can Help Them
No full textThis book:•Everard, M. (2015). River Habitats for Coarse Fish: How Fish Use Rivers and How We Can Help Them. Old Pond Publishing.is in three parts:1.How Britain’s diverse coarse fish species use river habitats throughout their life cycles – from egg to larva, juvenile and adult and during often dramatically varying conditions across the seasons – covering the three principal needs during these very different life stages of:a.Reproduction;b.Feeding; andc.Refuge.2.The radical changes to our river systems that have occurred relative to their fully natural conditions within which fish evolved, and which therefore represent bottlenecks to fish life cycles.3.Practical measures that people can undertake as part of fishery management – avoiding removing functional habitat, installing buffer zones and deflectors, bypassing weirs, etc. – that can alleviate these bottlenecks for the benefit of fisheries, associated wildlife and the many wider ecosystem service benefits that rivers provide.The book is endorsed with logos from:•The Angling Trust•The Rivers Trust•Wiltshire Wildlife Trust•The Institute of Fisheries Management•The Freshwater Biological Association•The River Restoration Centre•The Barbel Society•The Avon Roach Project•The Wild Trout Trust•The Salmon and Trout Associatio
The Wetland Book, Volume I: Structure and Function, Management and Methods
No full textAn edited volume coving all aspects of wetlands, Volume 1 doing as the subtitle suggests: Structure and Function, Management and Methods. Mark Everard has been sole or lead author on 40 chapters in the Wetland Book and junior author in a number of others
Indigenous People and Nature: Insights for Social, Ecological, and Technological Sustainability
No full textIndigenous People and Nature: Insights for Social, Ecological, and Technological Sustainability examines today’s environmental challenges in light of traditional knowledge, linking insights from geography, population, and environment from a wide range of regions around the globe. Organized in four parts, the book describes the foundations of human geography and its current research challenges, the intersections between environment and cultural diversity, addressing various type of ecosystem services and their interaction with the environment, the impacts of sustainability practices used by indigenous culture on the ecosystem, and conservation ecology and environment management. Using theoretical and applied insights from local communities around the world, this book helps geographers, demographers, environmentalists, economists, sociologists and urban planners tackle today’s environmental problems from new perspectives
Lessons learned from 20 years of managed realignment and regulated tidal exchange in the UK
No full textAgricultural Management and Wetlands:An Overview
No full textAgriculture is the major driver of wetland loss or degradation globally. However, wetland agriculture is also a major contribution to human well-being across the world and a critical contributor to livelihoods, poverty reduction, and climate change adaptation, especially in developing countries. Through wetland agriculture, hundreds of millions of people interact with wetlands. In addition to their partial use or wholesale conversion as agricultural systems, wetlands also play a diversity of additional roles in agricultural management. Effective management of wetlands for sustainable agricultural use is a global priority, both due to the impact of wetland management on the water cycle and value of wetland productivity for human security and development. A key consideration for their sustainable management is that all services of wetlands are considered, as all are pertinent to overall ecosystem characteristics and integrity, the balance of benefits that they confer on diverse beneficiaries, and hence the net benefit that they provide to society now and into the future. The role of wetlands in agricultural productivity are diverse, including both direct uses and the indirect supporting, regulatory, and cultural services they provide, adding to the resilience and functioning of wider landscapes. Progressive recognition and internalization of these wider benefits into the policy environment is essential if sustainable agriculture and wetland use are to be achieved for the net security of humanity.</p
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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