Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Revealing the secrets of African annonaceae : systematics, evolution and biogeography of the syncarpous genera Isolona and Monodora
Couvreur, T.L.P. - \ 2008
Wageningen University. Promotor(en): Marc Sosef, co-promotor(en): J.E. Richardson; Lars Chatrou. - [S.l.] : S.n. - ISBN 9789085049241 - 296
annonaceae - isolona - monodora - evolutie - taxonomie - plantengeografie - biogeografie - klassen - moleculaire taxonomie - taxonomische revisies - soorten - determinatietabellen - identificatie - afrika - annonaceae - isolona - monodora - evolution - taxonomy - phytogeography - biogeography - genera - molecular taxonomy - taxonomic revisions - species - keys - identification - africa
The goal of this PhD project was to study the evolution, systematics and biogeography of two African genera from the pan-tropical Annonaceae family: Isolona and Monodora. Both genera are unique within the family in that the female reproductive parts (or carpels) are fused into a single unit. All other Annonaceae have freely arranged carpels. We investigated the phylogenetic relationships of Isolona and Monodora at the intra-familial and intra-generic levels.
In Chapter 2, we explore the influence of priors when using the novel Bayesian based posterior mapping to study the evolution of morphological characters. Up to now, it was unclear if these priors had any influence on the results. Using a family level molecular phylogeny of the Annonaceae, we study the evolution of two morphological characters under different prior values. We show that different prior values will return different results. Thus, inadequate prior values can lead to erroneous conclusions over the evolution of the studied morphological characters. We also indicate a practical way to choose the prior values when using the posterior mapping approach to study morphological character evolution.
In Chapter 3, using the posterior mapping approach, we study the evolutionary origins of syncarpy in Annonaceae. The closest relatives of Isolona and Monodora are elucidated. We generate a well resolved phylogeny which included for the first time the majority of African Annonaceae genera. We also study additional morphological and palynological characters relevant to Annonaceae classification in general. Our phylogenetic analyses recover a fully resolved clade comprising twelve endemic African genera, including Isolona and Monodora, which was nested within the so-called long-branch clade. This is the largest and most species-rich clade of African genera identified to date within Annonaceae. Our results indicate that syncarpy arose by fusion of a moderate number of carpels. The alternative hypothesis that syncarpy arose by multiplication of an initial single carpel receives no support.
In Chapter 4 we use African Annonaceae as a model family to study the biogeographical aspects of the evolutionary origins of African rain forests. It is generally thought that the large West-Central rain forest blocks was continuous during the Eocene with the now fragmented and smaller forests of East Africa, explaining the strong floristic affinities between both areas. Using dated molecular phylogenies we provide evidence of the recurring break-up and reconnection of this pan-African rain forest during the Oligocene and Miocene. The reconnections allowed for biotic exchange while the break-ups induced speciation enhancing the levels of endemicity, thus providing an explanation for present-day patterns in the distribution and diversity of plants in African rain forests.
In Chapter 5, we perform a detailed analysis of pollen morphology within a strongly supported monophyletic group of five African genera, including Isolona and Monodora. We specifically assess if pollen characters are useful for classification purposes within Isolona and Monodora using a species-level molecular phylogeny. The results show a wide pollen morphological diversity. The pollen types defined within Isolona and Monodora provide little taxonomic information for major clades within both genera. However, pollen variation proves useful as a support of phylogenetic relatedness between groups of closely related species.
Finally in Chapter 6, a monographic revision of both Isolona and Monodora is presented. Isolona consists of 20 species with five endemic to Madagascar and one newly described species. Monodora has a total of 14 species, three of which were described during this PhD project from Tanzania. Detailed descriptions as well as keys are provided. The conservation status of each species is assessed following the IUCN recommendations. Just under half of the total number of species from both genera is assigned to some level of threat (12 species or 60% in Isolona and four species or 28% in Monodora).
Woody plants of Western African forests, A guide to the forest trees, shrubs and lianes from Senegal to Ghana
Hawthorne, W.D. ; Jongkind, C.C.H. - \ 2006
Richmond, Surrey UK : Royal Botanic Gardens, Kew - ISBN 1842460897 - 1023
houtachtige planten - bomen - struiken - bosbomen - klimplanten - identificatie - determinatietabellen - taxonomie - soorten - klassen - tropische bossen - foto's - illustraties - west-afrika - woody plants - trees - shrubs - forest trees - climbing plants - identification - keys - taxonomy - species - genera - tropical forests - photographs - illustrations - west africa
A guide to the identification of all the woody plants (c. 2,250 species in 740 genera) of the forest region of West Africa called 'Upper Guinea', between Togo and Senegal. Upper Guinea is one of the world's most important centres of biodiversity, from the mountain forests of Liberia, Guinea and Sierra Leone, to the lowland evergreen, and semideciduous forests widespread also in Ghana and Ivory Coast.
Neotropical Plant Families : A Concise Guide to Families of Vascular Plants in the Neotropics, 3rd edition
Maas, P.J.M. ; Westra, L.I.T. ; Chatrou, L.W. ; Farjon, A. - \ 2005
Koenigstein, Germany : Koeltz Scientific Books - ISBN 3906166279 - 289
planten - taxa - klassen - taxonomie - identificatie - neotropisch gebied - centraal-amerika - zuid-amerika - vaatplanten - plants - genera - taxonomy - identification - neotropical region - central america - south america - vascular plants
Heukels Flora van Nederland 23e druk
Meijden, R. van der - \ 2005
Groningen : Wolters-Noordhoff - ISBN 900158344X - 685 p.
planten - determinatietabellen - identificatie - taxonomie - taxa - klassen - plantengeografie - nederland - plants - keys - identification - taxonomy - genera - phytogeography - netherlands
Dit is het standaardwerk over de flora van Nederland. U vindt in 1 band de meest complete, wetenschappelijk betrouwbare flora. Met 2.000 soorten - een toename van 8% sinds 1996 - en een schat aan gedetailleerde illustraties. De enige flora die op ruime schaal op veldexcursies wordt getest. Sinds het uitkomen van de vorige editie is het internationale onderzoek naar de afstamming van planten (en dieren) in een bijna revolutionaire versnelling gekomen. Deze nieuwe inzichten zijn op een verantwoorde wijze ingepast. De gevolgen zijn duidelijk zichtbaar in de nieuwe volgorde der ordes en families, en deels ook in de verdeling van de genera over de families. In driekwart van de families is daarin niet veel veranderd, maar voor bijna alle families geldt dat zij op een andere positie in het boek verschijnen. De nieuwste inzichten op basis van wereldwijd DNA-zonderzoek zijn verwerkt.
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