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Fig. 1. – Keetia namoyae O. Lachenaud & Q. Luke. A in Keetia namoyae (Rubiaceae, Vanguerieae), a new species from eastern Democratic Republic of Congo
No full textFig. 1. – Keetia namoyae O. Lachenaud & Q. Luke. A. Flowering twig; B. Fruiting twig; C. Node with stipules; D. Detail of a domatia; E. Flower bud; F. Open flower; G. Longitudinal section of flower; H. fruit. [Bytebier & Luke 2796, BR] [Drawing: Antonio Fernandez]Published as part of Olivier Lachenaud, Quentin Luke & Benny Bytebier, 2017, Keetia namoyae (Rubiaceae, Vanguerieae), a new species from eastern Democratic Republic of Congo, pp. 23-26 in Candollea 72 (1) on page 25, DOI: 10.15553/c2017v721a2, http://zenodo.org/record/88838
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
Keetia namoyae O. Lachenaud & Q. Luke, spec. nova
No full textKeetia namoyae O. Lachenaud & Q. Luke, spec. nova (Fig. 1). Typus: DEMOCRATIC REPUBLIC OF CONGO . Prov. Maniema: Namoya, Mwendamboko Hill, 4°00’05”S 27°32’94”E, 12.IV.2008, fl. & fr., Bytebier & Luke 2796 (holo-: BR [BR000000524731]!; iso-: EA!). Foliis glabrescentibus et coriaceis venulis tertiariis inconspicuis K. tenuiflorae (Hiern) Bridson et K. mannii (Hiern) Bridson similis, sed ab ambabus speciebus conspicue differt ramis floriferis alternis (nec oppositis) cum indumento sparso et valde appresso, inflorescentiis paucifloris, floribus majoribus corollae tubo c. 4 mm longo (nec c. 2 mm) fructibusque majoribus c. 20 x 20 mm apice paullo emarginatis. Scandent shrub to 2 m high, with branches alternate and directed backwards, subtended by normal (not modified) leaves. Twigs rather sparsely covered with very stiffly appressed hairs, which persist for a long time on the woody, medium brown bark. Stipules c. 2 mm long, shortly triangular with apex laterally compressed, with same indumentum as twigs, very soon caducous. Leaves with petiole 4-7 mm long, stiffly appressedpubescent; blade elliptic, acute at base, acuminate at tip, 4-9 x 2.2-4 cm, very coriaceous, glabrous above, sparsely appressedpubescent on midrib beneath, drying dull brownish-green with underside paler; lateral nerves 4-6, not strongly prominent; tertiary veins invisible or almost so; small tuft-domatia present in axils of lateral nerves along midrib. Inflorescences cymose, 10-15-flowered, c. 1.5 cm long including c. 0.5 cm long peduncle, shortly branched, sparsely pubescent. Bracts small, c. 1.5 mm, triangular and acute at apex, ciliate. Flowers (4-)5-merous; pedicels 2-5 mm, densely appressed-pubescent. Calyx split almost to the base into narrowly triangular teeth c. 0.75 mm long, shortly ciliate on the margin. Corolla cream; tube cylindrical, 4 x 1.5 mm, glabrous outside, hairy inside with a ring of long (c. 1 mm) abruptly deflexed hairs near the lower 1/4th, and short sparse hairs above reaching just under the throat; lobes 2 mm long, reflexed, glabrous. Flower buds cylindrical with a rounded head. Anthers almost completely exserted, erect, c. 1 x 0.5 mm. Disk shortly pubescent. Style glabrous, exceeding throat by 3 mm and ending in a hood-like stigma c. 0.7 mm long. Fruit slightly obovate, 20 x 20 mm, rounded at base, very shallowly emarginate at apex, glabrous; pedicel reaching c. 8 mm. Etymology. – The species is named after its only known locality. Distribution and ecology. – Keetia namoyae is only known from the type locality in Maniema Province, eastern D.R. Congo (Fig. 2). It was found only once in disturbed, open secondary rain forest, at an altitude of 977 m. The following species were recorded in the vicinity: Adenia tricostata De Wild., Aidia micrantha (K. Schum.) F. White, Aptandra zenkeri Engl., Argomuellera pierlotiana J. Léonard, Boehmeria macrophylla Hornem., Celosia globosa var. porphyrostachya C.C.Towns., Crassocephalum rubens (Jacq.) S. Moore, Cyperus distans L.f., Dichapetalum sp., Dichapetalum parvifolium Engl., Dioscorea sp., Monanthotaxis sp., Justicia tenella (Nees) T. Anderson, Lindackeria schweinfurthii Gilg, Macaranga sp. nov. (Bytebier & Luke 2805), Puelia ciliata Franch., Rhabdophyllum welwitschii Tiegh., Rutidea insculpta Bridson, Solanum welwitschii C.H. Wright, Spermacoce exilis (L.O. Williams) W. C. Burger & C. M. Taylor, Thecacoris lucida (Pax) Hutch. and Tricalysia pallens Hiern. Fig. 1. – Keetia namoyae O. Lachenaud & Q. Luke. A. Flowering twig; B. Fruiting twig; C. Node with stipules; D. Detail of a domatia; E. Flower bud; F. Open flower; G. Longitudinal section of flower; H. fruit. [Bytebier & Luke 2796, BR] [Drawing: Antonio Fernandez] Conservation status. – This plant is known from a single location sensu IUCN (2012); the extent of occurrence is therefore not calculable, and the area of occupancy is estimated as 4 km ². It was collected on a hill that was due to be mined for gold; a decline in the area of occupancy, habitat extent and quality, number of locations and number of individuals is therefore expected. No other individuals are known, although the area has several other hills and is at the edge of extensive primary forest. The species is therefore assessed to be “Critically Endangered” [CR B2ab(ii,iii,iv,v)+D1] of the IUCN (1991). Notes. – Keetia namoyae is a rather distinctive species due to its very large fruits, small coriaceous leaves with inconspicuous tertiary venation, and twigs with sparse and very stiffly appressed hairs. Due to the appressed-pubescent twigs and lack of conspicuous tertiary veins, K. namoyae most closely resembles K. tenuiflora (Hiern) Bridson and some forms of K. mannii (Hiern) Bridson (the latter usually has glabrous twigs, but occasional variants with pubescent twigs occur). However, these two species differ from K. namoyae in many characters, including: flowering twigs opposite, with indumentum not so stiffly appressed; flowers more numerous (at least 25 per inflorescence, often more) and distinctly smaller, with corolla tube c. 2 mm long only; fruits smaller, <12 mm long, frequently 1-seeded, or if 2-seeded then strongly bilobed. Keetia tenuiflora further differs from K. namoyae in having a pale buff-grey bark. Although BRIDSON (1991: 921) described the fruits of K. tenuiflora as “ 1.2-1.5 cm long, 2 cm wide”, this appears to be erroneous; the largest fruits we have seen in this species are 12 mm long and 17 mm wide. Acknowledgements We are grateful to Antonio Fernandez for his drawing of this new species. BB and QL would like to thank the management of Banro Congo Mining Sarl for their support during the survey and acknowledge the cheerful company of the local guides whilst in the field. They would also like to thank Caroline Henderson and SRK Consulting (SA), South Africa, for the opportunity to contribute to the Environmental and Social Impact Assessment. Martin Callmander and Petra De Block are thanked for their comments on a first version of this paper. References Acknowledgements We are grateful to Antonio Fernandez for his drawing of this new species. BB and QL would like to thank the management of Banro Congo Mining Sarl for their support during the survey and acknowledge the cheerful company of the local guides whilst in the field. They would also like to thank Caroline Henderson and SRK Consulting (SA), South Africa, for the opportunity to contribute to the Environmental and Social Impact Assessment. Martin Callmander and Petra De Block are thanked for their comments on a first version of this paper. ReferencesPublished as part of Olivier Lachenaud, Quentin Luke & Benny Bytebier, 2017, Keetia namoyae (Rubiaceae, Vanguerieae), a new species from eastern Democratic Republic of Congo, pp. 23-26 in Candollea 72 (1) on pages 24-26, DOI: 10.15553/c2017v721a2, http://zenodo.org/record/88838
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
<i>Habenaria kilimanjari</i> newly recorded for Namibia
No full textBackground: The orchid flora of Namibia is depauperate and as a result is poorly studied.
Objectives: To further document the orchid flora of Namibia. Method: New herbarium collections were studied and the relevant published literature consulted.
Results: Habenaria kilimanjari is newly recorded for Namibia.
Conclusion: The newly recorded species increases our understanding of the orchid diversity in Namibia and underlines the need for continued botanical inventory work
Eulophia euglossa newly recorded for Kenya and Tanzania
No full textBackground: The orchid flora of East Africa is well documented. Nevertheless, new country records are still being discovered.
Objectives: To further document the orchid flora of East Africa.
Method: Herbarium collections and databases were studied. Relevant published literature was consulted.
Results: Eulophia euglossa is newly recorded for Kenya and Tanzania.
Conclusion: The newly recorded species increases our understanding of the orchid diversity in East Africa and underlines the need for continued botanical inventories
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
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