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Biosystematic studies of Spergularia media and S. marina in the Netherlands I. The morphological variability of S. media Naturalis
Sterk, A.A..
The present paper, the first of a series of four on the biosystematics of the Dutch halophilous species of Spergularia, reports the results of a study of the morphological variability of S. media by means of a number of population samples from all parts of the Dutch area, supplemented by the rearing of plants from seed samples in the experimental garden. The seeds of S. media are usually winged, but in the area of the Dutch North Sea Islands, sometimes populations are encountered containing up to 70% plants with exalate to subalate seeds. The development of the seed wing is chiefly determined by genetic factors, but to some extent modifiable by different environmental conditions. The seed wing is too variable to be of decisive diagnostic value to...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/535117
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Biosystematic studies on Spergularia media and S. marina in the Netherlands II. The morphological of S. marina Naturalis
Sterk, A.A..
In this second paper on the biosystematics of the Dutch halophilous Spergularia species, the results are reported of a study of the morphological variation of S. marina by means of population samples from all parts of the Dutch area. This study was supplemented by the rearing of plants from seed samples in the experimental garden. The seeds of S. marina are usually unwinged, but some plants also produce a few broadly winged seeds and in one population plants occur whose proximal capsules contain mainly broadly winged seeds. The differences between the populations persist in cultivation and are chiefly attributable to genetic differences. Winged seeds are upon the average larger and heavier than unwinged ones and also produce larger seedlings than the...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/534741
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Biosystematic studies on Spergularia media and S. marina in the Netherlands III. The variability of S. media and S. marina in relation to the environment Naturalis
Sterk, A.A..
In this third report of this series concerning biosystematic studies of the Dutch halophilous species of Spergularia, the relation between the variation and the environment is discussed. In the case of S. media, a correlation between the occurrence of populations with a high representation of plants with unwinged and subalate seeds and the degree of extremity of the abiotic factors prevailing in the habitat seems to be manifest. In some cases overgrazing by sheep or cattle also results in a relatively high representation of such plants in the population, even if the abiotic factors are favourable. The possible causes of a selective advantage of winged seeds over exalate seeds in certain types of habitats (and vice versa) are discussed. The predominantly...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/535064
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Biosystematic studies on Spergularia media and S. marina in the Netherlands IV. Reproduction, dissemination, karyogenetics and taxonomy Naturalis
Sterk, A.A..
In this fourth and last paper on the biosystematics of the Dutch halophilous species of Spergularia, some relevant details concerning their reproduction and dissemination are discussed, the results of a karyogenetic investigation are reported, and, finally, the taxonomic interpretation of the acquired data is given. S. media and S. marina differ in their mode of reproduction; the latter normally reproduces autogamously in nature and the former both allogamously and autogamously. Dispersal of the seeds is by polychory. S. media and S. marina have 2n = 18 and 2n = 36 chromosomes respectively. Hybridisation apparently does not occur. The taxonomic confusion is shown to be chiefly caused by an insufficient insight into the degree of variation of certain...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/534747
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Black Carib household structure a study of migration and modernization. Buscador Latinoamericano
Tipo: Text Palavras-chave: EL CARIBE; INDUSTRIA; NEGROS; ESTRUCTURA SOCIAL.
Ano: 1969 URL: http://www.flacso.org.ec/biblio/shared/biblio_view.php?bibid=10160&tab=opac&oai:flacso.org.ec:10160
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Blankaartia acuscutellaris (Acarina, Trombiculidae) et son extension au continent africain IRD
Taufflieb, Roger.
Tipo: Text Palavras-chave: ANATOMIE ANIMALE; BIOMETRIE; ECOLOGIE; ETHOLOGIE; REPARTITION GEOGRAPHIQUE; BLANKAARTIA BLANKAARTIA ACUSCUTELLARIS.
Ano: 1969 URL: http://www.documentation.ird.fr/hor/fdi:13356
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Boekaankondiging Naturalis
Kalkman, C..
TH. H. KLINKSPOOR, Kosmos Bomenboek, deel 1 (Naaldbomen, 123 p.) en deel 2 (Loofbomen, 164 p.). Uitg. Mij. Kosmos, Amsterdam, 1969 — f 16,50. Ortlangs zijn twee zeer aantrekkelijke boekjes verschenen, waarin ca. 50 naaldboom- en ca. 60 loofboomsoorten worden behandeld. Van elke soort is een aantal over het algemeen goede en instructieve foto’s opgenomen van boomhabitus, details van vegetatieve en generatieve delen, vaak ook van de stam. Bij de foto’s vindt men een korte beschrijving waarin behalve bijzonderheden van belang voor de herkenning, ook andere wetenswaardigheden omtrent verspreiding, cultuur, gebruik, standplaatseisen, enz. worden vermeld. Nog enkele andere soorten worden wat minder diepgaand behandeld, meer en passant genoemd, maar zij zijn vaak...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/527240
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Boekaankondiging Naturalis
NN.
SCHMEIL-FITSCHEN, Flora von Deutschland und seinen angrenzenden Gebieten. 81. Auflage von W. Rauh & K. Senghas. 516 S., 1103 Abb. Quelle & Meyer, Heidelberg, 1968 — DM. 16,80. Van de algemeen bekende flora van Schmeil-Fitschen waarvan thans twee afzonderlijke bewerkingen verschijnen, nl. één in West-Duitsland en één in de D.D.R. ontvingen wij de 81e druk van de Westduitse uitgave, de eerste volledige nieuwe bewerking van deze flora sedert de 70e druk van 1960. Niettegenstaande de omvang van het boek van 549 tot 516 pagina’s werd gereduceerd geeft deze druk toch heel wat meer dan de diverse voorafgaande, dank zij de toepassing van een kleiner, doch toch nog zeer duidelijk lettertype. Zo werden o.a. hoofdstukken toegevoegd over de indeling van het...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/526774
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Boekaankondigingen Naturalis
NN.
FLORA EUROPAEA, Volume 2, Rosaceae to Umbelliferae, edited by T. G. Tutin, V. H. Heywood, N. A. Burges, D. M. Moore, D. H. Valentine, S. M. Walters, D. A. Webb, with the assistance of P. W. Ball, A. O. Chater, I. K. Ferguson. XXVII + 455 p., 5 maps, University Press, Cambridge, 1968 — £ 77s. Van het eerste deel van deze flora van Europa gaf ik een vrij uitvoerige bespreking in het tijdschrift van de Koninklijke Nederlandse Botanische Vereniging, de Acta Botanica Neerlandica en wel in deel 14, afl. 2, 1965, p. 258—260. Voor die lezers van Gorteria, die niet gemakkelijk over dit tijdschrift kunnen beschikken volgt hier wat ik in hoofdzaak destijds over deze flora schreef:
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/527054
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Boekbesprekingen Naturalis
Kern, J.H.; Mennema, J..
Wie meer van het interessante geslacht Carex wil weten dan een flora kan geven, wordt dit boek in handig zakformaat warm aanbevolen. Het is een waardig pendant van het ook door de Nederlandse floristen veel gebruikte en gewaardeerde „Grasses” van Dr. C. E. Hubbard. Degelijke hoofdstukken over de morfologie, anatomie, oecologie en classificatie der zeggen worden gevolgd door een uitvoerige determinatie-tabel. Vooral sociologen zullen ingenomen zijn met een tweede tabel, die het mogelijk maakt niet-bloeiende Carices en een aantal op Carex gelijkende Cyperaceeën op naam te brengen. Alle in de Britse eilanden voorkomende soorten worden nauwkeurig beschreven en 69 platen geven niet alleen goede habitus-beelden, maar ook vele details, die voor de determinatie...
Tipo: Article / Letter to the editor
Ano: 1969 URL: http://www.repository.naturalis.nl/record/527506
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Book Review AgEcon
Buggie, Geoffrey J..
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/9196
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Book Reviews AgEcon
Jensen, R.C.; Cooke-Yarborough, R.E..
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/9226
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Book Reviews AgEcon
Cooke-Yarborough, R.E.; Gallagher, D.R..
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/9175
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BOOK REVIEWS AgEcon
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/23004
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Book Reviews AgEcon
Warr, Peter G.; Gallagher, D.R..
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/9122
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BOOK REVIEWS AgEcon
Tipo: Journal Article Palavras-chave: Teaching/Communication/Extension/Profession.
Ano: 1969 URL: http://purl.umn.edu/22939
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Business Rationale for Investment on Power Operated Maize Sheller in Bangladesh CIGR Journal
Swapan K Roy; Mike Albu; Abdur Rob.
A study was carried out to investigate the investment of a selected agro-machinery power operated Maize Sheller in the course of mechanization of Bangladesh. The analysis considers different types of Maize Sheller, and inter-regional differences in agro-economic factors that influence the business rationale for investment. Maize Shellers are increasingly needed to serve demand from poultry sector because manual shelling is very laborious. Comparing with manual shelling, results indicate that power operated Maize Shellers look like a wise investment (5 – 8 acres for 25% internal rate of return or IRR). However, it makes economic sense to operate shellers at higher capacities, and along with the high capital cost (Tk1 18,000 – 22,000) to save large numbers...
Ano: 1969 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/958
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Calcul automatique des paramètres de l'hydrogramme standard IRD
Moniod, Frédéric.
Tipo: Text Palavras-chave: LIMNIGRAPHIE; DEBIT; TRAITEMENT DE DONNEES; PROGRAMME; HYDROGRAMME STANDARD.
Ano: 1969 URL: http://www.documentation.ird.fr/hor/fdi:14858
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Campagne de lutte contre Glossina palpalis gambiensis Vanderplank dans la région de Bamako-Kati (République du Mali) : 11ème enquête du 10 au 23 janvier 1969 IRD
Eyraud, Marcel.
Tipo: Text Palavras-chave: MALADIE DU SOMMEIL; LUTTE CHIMIQUE; SURVEILLANCE; VECTEUR; EPIDEMIOLOGIE; FOYER EPIDEMIOLOGIQUE; GLOSSINA PALPALIS GAMBIENSIS.
Ano: 1969 URL: http://www.documentation.ird.fr/hor/fdi:13200
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Campagne de planctonologie No 6-OM 41 du 19 mars au 4 avril 1969 : rapport de mer IRD
Dessier, Alain; Fontana, André; Tanter, Jean-Jacques.
Tipo: Text Palavras-chave: CAMPAGNE OCEANOGRAPHIQUE; PLATEAU CONTINENTAL; FILET; PLANCTON; VOLUME FILTRE.
Ano: 1969 URL: http://www.documentation.ird.fr/hor/fdi:12235
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