1,721,011 research outputs found
Research objectives to support the South Florida Ecosystem Restoration initiative-Water Conservation Areas, Lake Okeechobee, and the East/West waterways
No full textThe South Florida Ecosystem encompasses an area of approximately 28,000 km2 comprising at least 11major physiographic provinces, including the Kissimmee River Valley, Lake Okeechobee, the Immokalee Rise, theBig Cypress, the Everglades, Florida Bay, the Atlantic Coastal Ridge, Biscayne Bay, the Florida Keys, the FloridaReef Tract, and nearshore coastal waters. South Florida is a heterogeneous system of wetlands, uplands, coastalareas, and marine areas, dominated by the watersheds of the Kissimmee River, Lake Okeechobee, and theEverglades.Prior to drainage, wetlands dominated the ecosystem, covering most of central and southern Florida. Thelandscapes included swamp forests; sawgrass plains; mosaics of sawgrass, tree islands, and ponds; marl-formingprairies dominated by periphyton; wet prairies dominated by Eleocharis and Nymphaea; freshwater marshes;saltwater marshes; cypress strands; and a vast lake-river system draining into Lake Okeechobee. Elevated areasthat did not flood supported pine flatwoods, pine rocklands, scrub, tropical hardwood hammocks, and xerichammocks dominated by oaks. The natural seascapes of South Florida consisted of riverine and fringe mangroveforests; beaches and dunes; seagrass beds; intertidal flats; mud banks; hardbottom communities; coral reefs; andopen, inshore shallows. All these habitats were interconnected on an extremely low topographic gradient (2.8cm/km) with elevations ranging from about 6 m at Lake Okeechobee to below sea level at Florida Bay.The Science SUb-Group (1993) described the defining characteristics of the South Florida Ecosystem and the problems that resulted from hydrologic alterations and other anthropogenic changes.Restoration objectives were proposed for each sub-regionand the region as a whole.The overall goal of the restoration effort is to restore a sustainable South Florida Ecosystem that preservesthe valued properties of South Florida's natural systems and supports productive agriculture-, fishery-, and tourist.based economies and a high quality of urban life. Sustainability means high natural productivity, human andecosystem health, and resiliency to climatic extremes and catastrophic events. It also means accommodation ofneeds of human systems-flood control, irrigation, and drinking water supply.SCOPEThis section addresses the entire ecosystem, cutting across the artificial boundaries of designatedsubregions, as well as geopolitical and geomorphological boundaries, to present the broader issues of deVelopingan interagency and interdisciplinary ecosystem-based science program to support South Florida restoration. Herewe discuss the general premise and the general approach, with brief discussions on monitoring, modeling, andspecial studies. The latter two topics are covered in greater detail in other sections. (PDF contains 119 pages)Research Work Order no. 139Science sub-meeting, September 27, 199
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Research objectives to support the South Florida Ecosystem Restoration initiative-Water Conservation Areas, Lake Okeechobee, and the East/West waterways
Get PDFThe South Florida Ecosystem encompasses an area of approximately 28,000 km2 comprising at least 11
major physiographic provinces, including the Kissimmee River Valley, Lake Okeechobee, the Immokalee Rise, the
Big Cypress, the Everglades, Florida Bay, the Atlantic Coastal Ridge, Biscayne Bay, the Florida Keys, the Florida
Reef Tract, and nearshore coastal waters. South Florida is a heterogeneous system of wetlands, uplands, coastal
areas, and marine areas, dominated by the watersheds of the Kissimmee River, Lake Okeechobee, and the
Everglades.
Prior to drainage, wetlands dominated the ecosystem, covering most of central and southern Florida. The
landscapes included swamp forests; sawgrass plains; mosaics of sawgrass, tree islands, and ponds; marl-forming
prairies dominated by periphyton; wet prairies dominated by Eleocharis and Nymphaea; freshwater marshes;
saltwater marshes; cypress strands; and a vast lake-river system draining into Lake Okeechobee. Elevated areas
that did not flood supported pine flatwoods, pine rocklands, scrub, tropical hardwood hammocks, and xeric
hammocks dominated by oaks. The natural seascapes of South Florida consisted of riverine and fringe mangrove
forests; beaches and dunes; seagrass beds; intertidal flats; mud banks; hardbottom communities; coral reefs; and
open, inshore shallows. All these habitats were interconnected on an extremely low topographic gradient (2.8
cm/km) with elevations ranging from about 6 m at Lake Okeechobee to below sea level at Florida Bay.
The Science SUb-Group (1993) described the defining characteristics of the South Florida Ecosystem and the problems that resulted from hydrologic alterations and other anthropogenic changes.
Restoration objectives were proposed for each sub-regionand the region as a whole.
The overall goal of the restoration effort is to restore a sustainable South Florida Ecosystem that preserves
the valued properties of South Florida's natural systems and supports productive agriculture-, fishery-, and tourist.
based economies and a high quality of urban life. Sustainability means high natural productivity, human and
ecosystem health, and resiliency to climatic extremes and catastrophic events. It also means accommodation of
needs of human systems-flood control, irrigation, and drinking water supply.
SCOPE
This section addresses the entire ecosystem, cutting across the artificial boundaries of designated
subregions, as well as geopolitical and geomorphological boundaries, to present the broader issues of deVeloping
an interagency and interdisciplinary ecosystem-based science program to support South Florida restoration. Here
we discuss the general premise and the general approach, with brief discussions on monitoring, modeling, and
special studies. The latter two topics are covered in greater detail in other sections. (PDF contains 119 pages
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Spatial and Temporal Changes in Tree Islands of the Arthur R. Marshall Loxahatchee National Wildlife Refuge in Response to Altered Hydrologies
Get PDFLoxahatchee can be grouped into three zones according to the patterns of change of tree
islands observed from 1950 to 1991. 1 ) the edge of
the refuge adjacent to the canals, 2) the eastern interior
of the refuge, and 3) the western interior of
the refuge. The general trend is for tree islands
Along the edge of the refuge to have decreased in
size, number, and percent cover, while those on the
interior increased in size, nunber, and percent
cover.
Results from this study illustrate the importance
of flow magnitude as well as hydroperiod
and depth in stucturing patterns of tree islands
within this peat wetland. Restoration of historic
hydroperiods and depths without historic flow patterns
may not be sufficient to restore or maintain
the historic pattern and function of the system. (60 pages
Spatial and Temporal Changes in Tree Islands of the Arthur R. Marshall Loxahatchee National Wildlife Refuge in Response to Altered Hydrologies
No full textLoxahatchee can be grouped into three zones according to the patterns of change of treeislands observed from 1950 to 1991. 1 ) the edge ofthe refuge adjacent to the canals, 2) the eastern interiorof the refuge, and 3) the western interior ofthe refuge. The general trend is for tree islandsAlong the edge of the refuge to have decreased insize, number, and percent cover, while those on theinterior increased in size, nunber, and percentcover.Results from this study illustrate the importanceof flow magnitude as well as hydroperiodand depth in stucturing patterns of tree islandswithin this peat wetland. Restoration of historichydroperiods and depths without historic flow patternsmay not be sufficient to restore or maintainthe historic pattern and function of the system. (60 pages
- …
