1,721,233 research outputs found
(Appendix Table C1) Percentage of seeds found in cargo and in luggage destined for Gough and Marion Island and the Antarctic
No full text(Appendix Table C1) Percentage of seeds found in cargo and in luggage destined for Gough and Marion Island and the Antarcti
(Table 1) Number of seeds found in cargo sampled in Cape Town and destined for Gough and Marion Island and the Antarctic
No full text(Table 1) Number of seeds found in cargo sampled in Cape Town and destined for Gough and Marion Island and the Antarcti
(Table 3) Number of seeds found in luggage and on expeditioners destined for Gough and Marion Island and the Antarctic
No full text(Table 3) Number of seeds found in luggage and on expeditioners destined for Gough and Marion Island and the Antarcti
(Appendix Table E1) Species of vascular plants growing within 500 m of the cargo packing station at Paarden Eiland and the Waterfront
No full textGISP = Global Invasive Species Database (www.issg.org/database/). X = found, - = not found
The Prince Edward Islands : land-sea interactions in a changing ecosystem
Full text linkCITATION: Chown, S.L. & Froneman, P.W. (eds). 2008. The Prince Edward Islands Land-Sea Interactions in a Changing Ecosystem. Stellenbosch: SUN PReSS. doi:10.18820/9781928357063.The original publication is available from AFRICAN SUNMeDIA - www.sun-e-shop.co.zaIslands are typically studied because of their unusual terrestrial plant and
animals life, because they form the breeding grounds for immense colonies
of pelagic predators, and because they provide remarkable, open-air
laboratories for understanding the structure and functioning of natural
systems. The sub-Antarctic Prince Edward Islands are no exception.
However, a great deal of attention has also been given to the way in which
marine and terrestrial systems interact and influence each other’s
dynamics, making the islands unusual. Indeed, Marion and Prince Edward
Islands and their surrounding marine systems are amongst the most
thoroughly investigated on the globe, and certainly hold the title for
Southern Ocean. This book provides a modern, synthetic overview of what
is known about the structure, functioning and interactions of marine and
terrestrial systems at the Prince Edward Islands. Building on more than 50
years of biological, geological, meteorological, and oceanographic research,
it demonstrates not only how inextricably linked marine and terrestrial
systems at the islands are, but also how global environmental challenges,
such as climate change, biological invasions, and over exploitation, are
playing out at the regional and local levels in the Southern Ocean. The
book also provides a rare insight into the history of the human presence on
the islands, including the ways in which South Africa’s socio-political history
has influenced practices at a remote sub-Antarctic research station, which
has been occupied since the islands’ annexation in 1947/48.Publishers' versio
Mean mass-specific metabolic rates are strikingly similar across life’s major domains: Evidence for life’s metabolic optimum
Full text linkhttp://www.pnas.org/content/105/44/16994 Copyright 2008 National Academy of Sciences, U.S.A.A fundamental but unanswered biological question asks how much energy, on average, Earth’s different life forms spend per unit mass per unit time to remain alive. Here, using the largest database to date, for 3,006 species that includes most of the range of biological diversity on the planet—from bacteria to elephants, and algae to sapling trees—we show that metabolism displays a striking degree of homeostasis across all of life. We demonstrate that, despite the enormous biochemical, physiological, and ecological differences between the surveyed species that vary over 1020-fold in body mass, mean metabolic rates of major taxonomic groups displayed at physiological rest converge on a narrow range from 0.3 to 9 W kg 1. This 30-fold variation among life’s disparate forms represents a remarkably small range compared with the 4,000- to 65,000-fold difference between the mean metabolic rates of the smallest and largest organisms that would be observed if life as a whole conformed to universal quarterpower or third-power allometric scaling laws. The observed broad convergence on a narrow range of basal metabolic rates suggests that organismal designs that fit in this physiological window have been favored by natural selection across all of life’s major kingdoms, and that this range might therefore be considered as optimal for living matter as a whole.Makarieva, Anastassia M; Gorshkova, Victor G; Li, Bai-Lian; Chown, Steven L; Reich, Peter B; Gavrilov, Valery M. (2008). Mean mass-specific metabolic rates are strikingly similar across life’s major domains: Evidence for life’s metabolic optimum. Retrieved from the University Digital Conservancy, 10.1073/pnas.0802148105
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
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