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| Registros recuperados: 10 | |
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| Hof, Kevin van den; Marcussen, Thomas; Berg, Ronald G. van den; Weeda, Eddy E.; Gravendeel, Barbara. |
| De taxonomie van Viola stagnina (Melkviooltje) is bestudeerd met behulp van elekronenmicroscopisch onderzoek, een transplantatie-experiment, kruisingen en chromosoomtellingen. Uit de analyses blijkt dat de hoogte van de planten, bladkleur, grootte en vorm van de steunblaadjes en vorm van de stijl veel fenotypische variatie vertoont tussen de twee vormen van V. stagnina die binnen Nederland voorkomen, te weten var. stagnina (Veenmelkviooltje) en var. lacteoides (Heidemelkviooltje). Het door ons uitgevoerde transplantatie-experiment laat zien dat een aantal van deze kenmerken beïnvloed wordt door abiotische factoren zoals licht en vochtigheid. Er zijn echter ook kenmerken zoals lengte van de bladsteel en bladschijf die significant van elkaar blijven... |
| Tipo: Article / Letter to the editor |
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| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/527483 |
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| Gravendeel, Barbara; Pelser, Pieter. |
| This practitioner’s manual is the complement to the recently published volume ‘Molecular Systematics and Evolution: Theory and Practice’ and focuses on recently developed techniques for data acquisition and analysis in molecular systematics and evolutionary biology. The first section examines analytical methods in chapters dealing with DNA sequence alignment optimisations, techniques for analysing large data sets as implemented in the program TNT, measures of support and data partitions. Approaches that will develop further in the next few years are also covered and the reader is subsequently exposed to chapters on genome databases and comparative phylogenomics. The second section is dedicated to obtaining and archiving specimens for molecular work and... |
| Tipo: Article / Letter to the editor |
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| Ano: 2002 |
URL: http://www.repository.naturalis.nl/record/526016 |
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| Gravendeel, Barbara; Koops, Kees (C.) G.. |
| The last record of Dianthus superbus in the Netherlands dates back to 1905. In the summer of 1995 and 1996, however, a flowering individual was found beside the river Waal, close to Nijmegen in the East of the Netherlands. Spontaneous dispersal is doubted as natural dispersal from the nearest large wild populations in Germany should have taken place over approximately 150 km. Moreover, the plant appeared to be Dianthus superbus ssp. superbus. The distribution of this subspecies is restricted to wet peats and nutrientpoor soils, a very different habitat compared with the dyke area. Finally, the dyke area, in which the plant was found, was treated with a wild flower seed-mixture. Therefore, the species has to be transferred back to Red List category 0. |
| Tipo: Article / Letter to the editor |
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| Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/526477 |
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| Gravendeel, Barbara. |
| This book is the complement of the also recently published practitioner’s manual ‘Techniques in Molecular Systematics and Evolution’ (see Book Notices, p. 346) and focuses on present progress in molecular systematics. It is divided into three major parts. The first section examines the utility of molecular information in systematics through empirical examples ranging from population, species and genus to order level. The reader is subsequently exposed to problems relevant to the understanding of hierarchical relationships around geographical races and species boundaries and shortcomings of analytical methods applied at the level of bird, mammal and insect orders such as limited taxon sampling and rapid radiations. The second section looks at problems... |
| Tipo: Article / Letter to the editor |
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| Ano: 2002 |
URL: http://www.repository.naturalis.nl/record/525726 |
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| Registros recuperados: 10 | |
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