118,104 research outputs found
Dick Hille Ris Lambers, afidologo
No full textVengono ricordate la vita e l\u27operosità scientifica dello studioso olandese D. Hille Ris Lambers, afidologo di fama mondiale, dottore \u27honoris causa\u27 nell\u27Università degli Studi di Milano e illustre collaboratore del nostro "Bollettino".The life and scientific work of the Dutch scientist, D. Hille Ris Lambers, world famous aphidologist, doctor \u27honoris causa\u27 of the University of Milan, and illustrious collaborator of our \u27Bollettino\u27 is remembered
Microsiphum wahlgreni Hille Ris Lambers 1947
No full textMicrosiphum wahlgreni Hille Ris Lambers 1947 = Microsiphum jazykovi Nevsky 1928 This synonymy was proposed more than 50 years ago by Börner (1952), and seems entirely valid, but was not adopted in subsequent catalogues.Published as part of Victor, Eastop, F. & Blackman, Roger L., 2005, Some new synonyms in Aphididae (Hemiptera: Sternorrhyncha), pp. 1-36 in Zootaxa 1089 on page 16, DOI: 10.5281/zenodo.27334
Dysaphis albocinerea Hille Ris Lambers 1956
No full textDysaphis albocinerea (Hille Ris Lambers, 1956) = Dysaphis emicis Mimeur (1935) Dysaphis rheicola Daniyarova in Mamontova and Daniyarova, 1971 = Dysaphis emicis Mimeur (1935) Synonymy of D. albocinerea with D. emicis was proposed by Shaposhnikov (1964). The description of D. rheicola also does not distinguish it from D. emicis on the same host.Published as part of Victor, Eastop, F. & Blackman, Roger L., 2005, Some new synonyms in Aphididae (Hemiptera: Sternorrhyncha), pp. 1-36 in Zootaxa 1089 on page 11, DOI: 10.5281/zenodo.27334
Xerobion tashevella Eastop & Hille Ris Lambers 1976
No full text<i>Xerobion tashevella</i> (Eastop & Hille Ris Lambers 1976) = <i>Xerobion cinae</i> (Nevsky 1928) <p> <i>X. tashevella</i> is a replacement name given to <i>Brachyunguis lambersi</i> Tashev by Eastop and Hille Ris Lambers (1976) when they transferred it to <i>Aphis (Absinthaphis)</i>. Kadyrbekov (2001b) subsequently placed this <i>Artemisia</i> ­feeding species in <i>Xerobion</i>. Tashev (1964) provided a detailed description, and we cannot find any characters to distinguish between his species, described from Bulgaria, and <i>X. cinae</i>, described from Central Asia and subsequently recorded from Moldova and eastward as far as Kashmir.</p>Published as part of <i>Victor, Eastop, F. & Blackman, Roger L., 2005, Some new synonyms in Aphididae (Hemiptera: Sternorrhyncha), pp. 1-36 in Zootaxa 1089</i> on page 25, DOI: <a href="http://zenodo.org/record/273344">10.5281/zenodo.273344</a>
Aphis (Protaphis) striata Hille Ris Lambers 1967
No full textAphis (Protaphis) striata (Hille Ris Lambers 1967) = Aphis (Protaphis) picridicola Holman 1966 These three descriptions, of an Aphis (Protaphis) species on basal parts of composite plants in former Czechoslovakia, Italy and Germany respectively, were published in close succession. The BMNH collection has paratypes of all three and they are clearly all the same species. All three descriptions include apterous viviparae and oviparae. Holman and Müller both described the apterous males. This aphid lives in antattended colonies on the roots and at bases of radical leaves of a closelyrelated group of plant genera; Picris, Hypochaeris and Leontodon (Hypochaeridinae).Published as part of Victor, Eastop, F. & Blackman, Roger L., 2005, Some new synonyms in Aphididae (Hemiptera: Sternorrhyncha), pp. 1-36 in Zootaxa 1089 on page 7, DOI: 10.5281/zenodo.27334
New and little known members of the aphid fauna of Italy (Homoptera, Aphididae)
No full textL\u27A. passa in rassegna alcune interessanti specie di Afidi reperite nel corso di brevi visite effettuate in Italia negli ultimi anni o inviategli in esame da studiosi italiani. Sono descritte le seguenti specie e sottospecie nuove: Dactynotus pseudobscurus, Lachnus castaneae, Macrosiphoniella tanacetaria italica, Macrosiphum albertinae, Periphyllus venetianus, Protaphis striata. Sono fornite note su alcune specie della collezione Passerini e sono proposte le seguenti nuove combinazioni: Brachycaudus persicae (Passerini) e Protaphis terricola (Rondani). Macrosiphoniella chamomillae Hille Ris Lambers è considerata sinonimo di Macrosiphoniella tapuskae (Hottes & Frison)
Aulacorthum rufum Hille Ris Lambers 1947
No full textAulacorthum aff. rufum Material. NUO: near to Valyok Vill., 21.vii.2017, Pyrola grandiflora Radius, on lower side of leaves, imm. [28. vii.2017, apt., al.]; near to Talnakh, 26.vii.2017, Pyrola grandiflora, on lower side of leaves, apt. (AS). Comments. Collected specimens are identifiable with the key of Blackman and Eastop (2019) as Aulacorthum rufum Hille Ris Lambers, but exhibit some differences from this species: setae on the 3rd antennal segment are longer than 0.33 of the articular diameter of this segment; the cauda has more than 7 setae; 4th and 5th antennal segments of alatae are shorter than 3rd segment. They also exhibit similarities with Aulacorthum pirolacearum Szelegiewicz, however, their processus terminalis has a smaller ratio to the base of the 6th segment (4.46 for alatae and 4.76–5.04 for apterae versus to 4.67–5.80 and 5.40 respectively for alatae and apterae of Aulacorthum pirolacearum). The results indicate the need for further study of the morphology and biology of these two species. Macrosiphoniella artemisiae (Boyer de Fonscolombe) Material. NDU: 8.vii.2017, Artemisia vulgaris L., shaking, fund., imm. [13 and 20.vii.2017, apt.] and 17.vii.2017, Artemisia vulgaris, shaking, fund. and apt. (AS). Macrosiphoniella tanacetaria (Kaltenbach) Material. NDU: 9.vii.2017, Tanacetum vulgare, shaking, fund. (AS). NUO: near to Talnakh, 23 and 26.vii.2017, Tanacetum vulgare, on apices of stems and on flower stalk, apt. (AS). Macrosiphoniella tapuskae (Hottes et Frison) Material. NUO: near to Valyok Vill., 21.vii.2017, Tanacetum vulgare, shaking, apt., al. and imm. [23.vii.2017, apt.] (AS). Macrosiphoniella (Phalangomyzus) oblonga (Mordvilko) Material. NDU: 8.vii.2017, Artemisia vulgaris, shaking, fund. and 17.vii.2017, Artemisia vulgaris, shaking, fund. and apt. (AS). Macrosiphum chukotense Stekolshchikov et Khruleva Material. PLA: 24.vii.2001, forb-grass meadow, sweeping, al. (OKh). NDU: 1.vii.2017, Saussurea parviflora (Poir.) DC., on flower stalk, imm. [5.vii.2017, fund.], 3.vii.2017, Ranunculus borealis Trautv., on upper side of leaf, imm. [8.vii.2017, apt.] and 4.vii.2017, Petasites frigidus (L.) Fr., on on flower stalk, imm. [7–18.vii.2017, apt.] (AS). NUO: near to Talnakh, 22.vii.2017, Angelica archangelica subsp. decurrens (Ledeb.) Kuvaev, on lower side of leaves, apt.; 25.vii.2017, Epilobium angustifolium, on flower stalk, apt.; 26.vii.2017, Cirsium helenioides (L.) Hill, on stem and flowers, apt.; 29.vii.2017, Arnica angustifolia subsp. iljinii (Maguire) I.K. Ferguson, on stem, apt. (AS). Macrosiphum rosae (Linnaeus) Material. NDU: 2.vii.2017, Rosa acicularis Lindl., on petiole of apical leaves, fund., imm. [9.vii.2017, al.] (AS). * Metopolophium alpinum Hille Ris Lambers Material. NDU: 2.vii.2017, Rosa acicularis, on lower side of leaves, imm. [6.vii.2017, al.] and 7.vii.2017, Rosa acicularis, on lower side of leaves, apices of stems and flower stalk, fund., apt., al. (AS). Comments. The collected specimens are easily identified as Metopolophium alpinum Hille Ris Lambers, although the antennae of the alate viviparous females have more rhinaria than is typical, and the abdomen has no dorsal sclerites; these differences can be interpreted as due to geographical variability.Published as part of Stekolshchikov, Andrey V. & Khruleva, Olga A., 2020, Contribution to the aphid fauna (Homoptera, Aphidinea) of the Taymyrsky Dolgano-Nenetsky District and the krai city of Norilsk, with descriptions of two new species of the genus Metopolophium, pp. 87-118 in Zootaxa 4748 (1) on pages 95-96, DOI: 10.11646/zootaxa.4748.1.5, http://zenodo.org/record/369762
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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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