References of "Belgian Journal of Botany"
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See detailDirect regeneration of rattan seedlings from apical meristem and axillary bud explants
Kouakou, L. K.; Zoro Bi, I. A.; Kouakou, T. H. et al

in Belgian Journal of Botany (2009), 142(1), 60-67

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See detailGenetic diversity of the andean tuber crop species ullucus tuberosus as revealed by molecular (ISSR) and morphological markers
Malice, Marie ULg; Villaroel Vogt, Carmen Licht; Pissard, Audrey et al

in Belgian Journal of Botany (2009), 142(1), 68-82

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See detailContribution Of Delayed Autonomous Selfing To Reproductive Success In Kosteletzkya Virginica
Ruan, Cj.; Zhou, Lj.; Zeng, Fy. et al

in Belgian Journal of Botany (2008), 141(1), 3-13

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See detailSeed rain pattern of the invasive weed Senecio inaequidens (Asteraceae)
Monty, Arnaud ULg; Stainier, Charles; Lebeau, Frédéric ULg et al

in Belgian Journal of Botany (2008), 141(1), 51-63

Dispersion capacity of alien invasive plants is a key feature for understanding invasion processes and risks. Here, we present an experimental study focussing on the seed rain pattern of Senecio ... [more ▼]

Dispersion capacity of alien invasive plants is a key feature for understanding invasion processes and risks. Here, we present an experimental study focussing on the seed rain pattern of Senecio inaequidens, an African plant widespread throughout Europe, under common favourable dispersal conditions. One hundred achenes from two Belgian populations underwent a drop time in still air experiment in order to assess linear correlation between several morphological traits and terminal velocity. Variation in morphological traits was measured for 250 additional achenes per population. The trait best correlated to terminal velocity was the square root of the plume loading. We then used this trait to model terminal velocity using a linear regression (r(2) of 79.7%). With this regression and imposing ecological parameters such as wind speed, turbulences and height of release to be representative of favourable dispersal conditions, we established a Gaussian tilted plume model to predict the seed rain pattern of the species. A wind tunnel experiment consequently permitted to validate the model. Under a wind speed of 5 m s(-1) with 2% turbulences along the vertical axis, and height of release of 0.40 m, 99.8% of achenes were dispersed within 100 meters, with a maximum deposition rate at 5.2 m from the parent plant. Uplifted achenes, not forecasted by the model, represent 6.25% of all achenes. [less ▲]

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See detailPlant species extinction debt in a biodiversity hotspot: community and species approaches
Piqueray, Julien ULg; Bisteau, Emmanuelle ULg; Cristofoli, Sara ULg et al

in Belgian Journal of Botany (2008), 141(2), 189

Destruction and fragmentation of natural and semi-natural habitats are considered as major threats for plant species richness. However, the response of plant species richness to habitat alteration is ... [more ▼]

Destruction and fragmentation of natural and semi-natural habitats are considered as major threats for plant species richness. However, the response of plant species richness to habitat alteration is sometimes delayed. This delay induces an extinction debt in plant communities that are thus prone to undergo species extinctions in the following years. Several methodologies were proposed to detect this extinction debt and estimate the mean number of species yet to disappear. In this study, we developed a new methodology for the estimation of the extinction debt extent. Moreover, we proposed a species approach aimed at determining which species are more sensitive to extinction as a consequence of habitat destruction and fragmentation. Finally, we explored the colonization ability of habitat specialist species. This aspect is of fi rst importance to counteract local species extinctions. Our model habitat is calcareous grasslands of Southeast Belgium that have suffered an important fragmentation process since the beginning of the twentieth century. We estimated that the mean extinction debt of the calcareous grassland patches was ca. 24 species, including ca. six specialist species. We showed that 16 of the 46 specialist species did not meet their area requirement anymore and were therefore considered as sensitive to extinction. However, the species composition of the more recent grasslands indicates a non-negligible recolonization potential of specialist species. There is thus a real possibility to reduce extinction risk by restoring suitable habitats. [less ▲]

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See detailNaturalization and impact of a horticultural species, Cotoneaster horizontalis (Rosaceae) in biodiversity hotspots in Belgium
Piqueray, Julien ULg; Mahy, Grégory ULg; Vanderhoeven, Sonia

in Belgian Journal of Botany (2008), 141

Cultivation of ornamental plant species has been recognized to foster plant naturalization of exotics by counteracting environmental stochasticity and continuously providing propagules. As a preliminary ... [more ▼]

Cultivation of ornamental plant species has been recognized to foster plant naturalization of exotics by counteracting environmental stochasticity and continuously providing propagules. As a preliminary attempt to describe the invasion status of C horizontalis, we gathered information on the occurrence of the species in Belgium by compiling various databases. We assessed the naturalization status of C. horizontalis in Belgian calcareous grasslands, high-value habitats recognized as biodiversity hotspots, by characterizing its occurrence, population status, preferred habitats, invaded communities, growth rate and fruiting capacity. We also assessed the impact of the species on calcareous grasslands communities and on individual species. Cotoneaster occurred in seven of the nine investigated sites, with densities varying from 0.34 to 10 individuals/ha. In the most invaded sites, the high proportion of small individuals suggests an important ongoing colonization process, emphasized by the fact that fruiting capacities were demonstrated for 3-year-old individuals. Invaded habitats were typically Mosan Xerobromion habitats, which are priority Natura 2000 habitats. The presence of C horizontalis was associated with changes in both the structure and composition of the community by decreasing species richness and diversity, and affecting grassland specialist species. These impacts are expected to intensify over time with population age and increasing propagule pressure due to close urbanization. [less ▲]

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See detailBRYOPHYTE CHECKLIST AND EUROPEAN RED LIST OF THE BRUSSELS-CAPITAL REGION, FLANDERS AND WALLONIA (BELGIUM)
Sotiaux, A.; Stieperaere, H.; Vanderpoorten, Alain ULg

in Belgian Journal of Botany (2007), 140

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See detailPlant communities and species richness of the calcareous grasslands in southeast Belgium
Piqueray, Julien ULg; Bisteau, Emmanuelle ULg; Bottin, Gaëtan et al

in Belgian Journal of Botany (2007), 140(2), 157-173

Calcareous grasslands are biodiversity hotspots in Western Europe. In Belgium, a number of phytosociological surveys have been realized in these habitats, but none covers the whole range of calcareous ... [more ▼]

Calcareous grasslands are biodiversity hotspots in Western Europe. In Belgium, a number of phytosociological surveys have been realized in these habitats, but none covers the whole range of calcareous grasslands at the regional scale. The aim of this study was (i) to provide a synthesis of the floristic variation of calcareous grasslands of the Calestienne natural region using a uniform methodology; (ii) to relate floristic variation to environmental variables, and (iii) to characterize the specific diversity of the different grassland communities that occur in the study region. Seven different communities were identified with the TWINSPAN method. The originality of the grasslands on calcareous and calcareo-siliceous rocks was statistically confirmed. Significant differences for environmental variables were identified among the seven communities by a MANOVA. Main differences between communities were related to xericity and pH, although a north-south gradient was also identified. More xeric grasslands were located in the southern part of the study region while northern part was occupied by more mesophilous grasslands. Multiple regressions were used to describe the influence of the environmental conditions on plant species richness. The most mesophilous grasslands appeared to be the most species-rich while soil acidity negatively affected species richness. [less ▲]

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See detailEarly abortion in reciprocal crosses between phaseolus vulgaris and phaseolus polyanthus, and in vitro culture of immature embryos from these species
Toussaint, André ULg; Geerts, P.; Clement, F. et al

in Belgian Journal of Botany (2004), 137(1), 47-54

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See detailEcology And Conservation Of Belgian Populations Of Viola Calaminaria, A Metallophyte With A Restricted Geographic Distribution
Bizoux, Jean-Philippe ULg; Brevers, F.; Meerts, P. et al

in Belgian Journal of Botany (2004), 137(1), 91-104

Viola calaminaria (Gingins) Lej. is a rare and threatened species, endemic to metalliferous soils in E Belgium, S Netherlands and W Germany. In order to provide basic information for a conservation ... [more ▼]

Viola calaminaria (Gingins) Lej. is a rare and threatened species, endemic to metalliferous soils in E Belgium, S Netherlands and W Germany. In order to provide basic information for a conservation strategy, we performed an ecogeographic survey of almost all V. calaminaria populations currently existing in Belgium. Twenty-four populations were found, distributed in three geographic groups all in the Province of Liège. The area covered by V. calaminaria ranged from < 1 m2 to 3.2 ha. The largest populations were found in sites contaminated by atmospheric deposits from metal smelters. Soils were extremely variable in heavy metal and nutrient concentrations, but concentrations of Zn, Pb and Cd were consistently higher than reference values for normal soils. V. calaminaria was most often found in association with other metallophyte and pseudometallophyte taxa typical of metalliferous sites. Plant communities identified by TWINSPAN analysis generally fitted the heavy metal associations previously described but two unusual heavy metal plant communities were identified. Based on a canonical correspondence analysis, pH was the only factor that was clearly correlated with the floristic composition of plant communities associated to V. calaminaria. This study confirmed the ecological endemic status of V. calaminaria and the importance of the conservation of metalliferous sites. [less ▲]

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See detailCopper And Vegetation At The Kansanshi Hill (Zambia) Copper Mine
Leteinturier, B.; Baker, Ajm.; Bock, Laurent ULg et al

in Belgian Journal of Botany (2001), 134(1),

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See detailContribution à l'étude de la flore des grottes de Belgique.
Garbacki, Nancy ULg; Ector, Luc; Kostikov, Igor et al

in Belgian Journal of Botany (1999), 132(1), 43-76

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See detailMorphologie, distribution et écologie comparées d'Amblystegium tenax et d'A. fluviatile en Belgique
Vanderpoorten, Alain ULg; Empain, Alain ULg

in Belgian Journal of Botany (1999), 132(1), 3-12

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See detailEvolution de la végétation du secteur sud de la tourbière haute active de la fagne Wallonne, au cours de ces 60 dernières années (Plateau des Hautes-Fagnes, Belgique)
Frankard, Philippe; Hindryckx, Marie-Noëlle ULg

in Belgian Journal of Botany (1998), 131(1), 28-40

Evolution of the vegetation in the southern part of the fagne Wallonne raised bog, during the last 60 years (Hautes- Fagnes, Belgium). – Less than 500 years ago, raised bogs covered over 1000 ha on the ... [more ▼]

Evolution of the vegetation in the southern part of the fagne Wallonne raised bog, during the last 60 years (Hautes- Fagnes, Belgium). – Less than 500 years ago, raised bogs covered over 1000 ha on the Hautes-Fagnes plateau. Today, only + 125 ha of ombrotrophic little disturbed raised bogs remain. Recent studies have proved that these remnants show evidences of typical peat-forming communities regression. The aim of this study is to follow the vegetation dynamic of the southern part of the fagne Wallonne raised bog, by comparison of old and recent vegetation transects made in 1938, 1957 and 1995 and to detect in it some possible signs of evolution or regression. The vegetation has been mapped at 1 :10 scale and qualitatively surveyed on 4 m2 plots each 20 m along the transect. The cover degree of each species has been estimated. The results show a large reduction of the cover degree of Sphagnum species, an almost disappearance of the "Schlenken" and an increase of heathland species. These results are compared with the observations for the northern and the central zones (HINDRYCKX 1989). The damage to the typical raised bog vegetation is very clear and important in the northern part of the bog: disappearance of typical species overgrown by Molinia caerulea. In the central and the southern parts, the increasing cover degree of ericaceous plants indicates clearly that the peat forming activity is strongly slowed down. [less ▲]

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See detailChorologie et écologie de Pycnoporus Cinnabarinus (Polyporaceae) en Belgique, au Grand-Duché de Luxembourg et dans les régions limitrophes
Thoen, Daniel ULg; Fraiture, A.; Nicolas, Jacques ULg

in Belgian Journal of Botany (1998), 131(2), 260-272

L'extension récente, après 1960, de Pycnoporus cinnabarinus, en Belgique, au Grand-Duché de Luxembourg et dans les régions limitrophes est analysée à l'aide d'une série chronologique de cartes de ... [more ▼]

L'extension récente, après 1960, de Pycnoporus cinnabarinus, en Belgique, au Grand-Duché de Luxembourg et dans les régions limitrophes est analysée à l'aide d'une série chronologique de cartes de distribution. La propagation du champignon semble s'être effectuée à deux "vitesses" : par bonds, sur des distances de plusieurs dizaines de kilomètres, et de proche en proche, au départ de populations voisines. L'analyse de la fréquence et de la fréquence cumulée des récoltes montre deux grandes "vagues" successives d'expansion du champignon. La liste des arbres hôtes est établie ainsi que la fréquence relative du champignon en fonction des hôtes. Les hôtes les plus fréquents sont les bouleaux (Betula alba et Betula pendula), le hêtre (Fagus sylvatica), le sorbier des oiseleurs (Sorbus aucuparia) et les chênes (Quercus robur et Quercus petraea). Les causes de l'extension et des fluctuations des populations du champignon ne sont pas connues avec certitude. Il semble cependant que des facteurs climatiques et le fait que de plus grandes quantités de bois pourrissant soient abandonnées sur les coupes puissent être impliqués. [less ▲]

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See detailPhenologie des Basidiomycetes lignicoles de l'ile de Laing (Papouasie Nouvelle-Guinee)
Castillo Cabello, Gabriel ULg; Demoulin, Vincent ULg

in Belgian Journal of Botany (1998)

In the framework of a study of wood-inhabiting fungi on Laing Island, a small coral island located on the northern coast of Papua New Guinea, we have established a phenological table of the 96 taxa of ... [more ▼]

In the framework of a study of wood-inhabiting fungi on Laing Island, a small coral island located on the northern coast of Papua New Guinea, we have established a phenological table of the 96 taxa of encountered Basidiomycetes. Within six species presenting large phenological amplitude, two groups can be distinguished. On the one hand a group of species (Hexagonia tenuis, Polyporus philippinensis and Microporus xanthopus) with narrow ecological amplitude restricted to dense vegetation cover and thus growing in an environment buffered against desiccation and on the other hand a group of species (Pycnoporus sanguineus, Schizophyllum commune and Trametes scabrosa) with a very large ecological amplitude very resistant to desiccation. Furthermore, a large number of species are found too sporadically in order to draw some conclusions concerning their phenology. [less ▲]

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See detailThe application of spatial autocorrelation methods to the study of Calluna vulgaris population genetics
Mahy, Grégory ULg; Néve, Gabriel

in Belgian Journal of Botany (1997), 129

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See detailNew Primers For The Polymerase Chain Amplification Of Cpdna Intergenic Spacers In Phaseolus Phylogeny
Fofana, B.; Harvengt, L.; Baudoin, Jean-Pierre ULg et al

in Belgian Journal of Botany (1997), 129(2),

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See detailTwo rare European Ephemerum species (Bryophita): E. cohaerens rediscovered near Strasbourg (France) and E. stellatum new to Belgium
Vanderpoorten, Alain ULg; Stieperaere, H.; Klein, J.-P.

in Belgian Journal of Botany (1996), 129

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