The Ecology of Short-Lived Forbs in Chalk Grasslands: Distribution of Germinative Seeds and its Significance for Seedling Emergence

Schenkeveld, A. J.; Verkaar, H. J.

doi:10.2307/2844644

Cited by 69 publications

(35 citation statements)

References 33 publications

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“…Poor correspondence between buried seed flora and vegetation composition in grassland communities was observed (e.g. Schenkeveld and Verkaar 1984). In Swedish grasslands changes in above-and below-ground flora were similar, and in most cases the species lost from the growing vegetation could not be found in the bank, either (Milberg 1992(Milberg , 1995.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variability of seed bank resulting from overgrowing of xerothermic grassland

Czarnecka

2011

Acta Soc Bot Pol

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The aim of my study was to determine changes in the seed bank and vegetation during the process of overgrowing of the xerothermic grassland situated on the slopes of the White Mountain (349 m a. s. l., the Central Roztocze Region, South-Eastern Poland). I also examined whether the changes of vegetation can be predicted if we know the structure of the burned seed flora. To achieve this goal I used two sets of data: one collected from three different environments (grassland, brushwood and woodland) at the same time (toposequence), and the other collected twice from the same place at the interval of seven years (chronosequence). I stated that the appearance of even a small number of ornitochorous seeds and their seedlings can be treated as a signal that the bush encroachment will accelerate. Seed number seems to decrease during succession in the analysed sequence of plant communities. The total number of species in the seed bank did not change in the most dynamic plant communities: grassland and brushwood, and it was significantly higher there than in the seed bank of woodland. During the time of observation, the most important quantitative and qualitative changes took place in grassland vegetation, which is more similar to brushwood vegetation now than it was at the beginning of the study.

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Section: Introductionmentioning

confidence: 99%

Spatial and temporal variability of seed bank resulting from overgrowing of xerothermic grassland

Czarnecka

2011

Acta Soc Bot Pol

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“…Due to both biotic and abiotic factors, different patterns are seen between species within one community and between communities that differ in the composition of their vegetation (Schenkeveld and Verkaar 1984;Thompson 1986;Lavorel et al 1991). Studies undertaken in old field communities have shown that there is a natural connection between the grouping of species within the seed bank with that of the established vegetation (Bigwood and Inouye 1988;Lavorel et al 1991) and when this connection does not occur, it is due to some abiotic factors controlling their spatial distribution (Lavorel et al 1991).…”

Section: Discussionmentioning

confidence: 97%

“…These patterns of distribution in the herbaceous communities on a small scale have been considered in detail by various authors (Schenkeveld and Verkaar 1984;Thompson 1986;Bigwood and Inouye 1988;Lavorel et al 1991;Chocarro et al 1994;Herben et al 1995;Rebollo et al 2001;Shaukat and Siddiqui 2004) and have important ecological implications. Seed predation or competition among seedlings can result in an increasing mortality if seeds are clustered, whereas a uniform spatial pattern minimises mortality (Bigwood and Inouye 1988).…”

Section: Introductionmentioning

confidence: 95%

Spatial patterns in seed bank and vegetation of semi-natural mountain meadows

2006

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Soil seed bank composition and vegetative spatial patterns were studied in four mountain meadow communities in the Broto Valley (N. Spain), in order to analyse the differences that might exists between the two life forms. Soil and vegetation samples were taken at 1 m intervals from 10 m Â 10 m quadrats in each meadow in one-year study. The spatial distribution of species was analysed along with the calculation of an autocorrelation coefficient which takes account of the relative position of samples: (Moran's I). The results indicate that the abundance of the majority of the species in the seed bank and in the vegetation are randomly distributed, the percentage of species with a clumped distribution only exceeds 35% in the vegetation of one meadow and none of the taxa identified showed a uniform spatial organisation. The species that were distributed in the seed bank in a clumped pattern in more than one meadow were those of the pioneer species (Anagallis arvensis, Centaurium erythraea, Lamium purpureum and Stellaria media). All of these formed long-term persistent seed banks but were absent in the established vegetation in these meadows. According to the results, there exist not only differences between the spatial distribution of the species present in the same community, but also, that some species change their pattern of distribution according to the life form and to the grassland type in which they are found.

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“…200m-2 ); no seeds ofthe other short-lived species were met with. In the Vrakelberg soil, seed density showed large spatial variation (Schenkeveld and Verkaar 1984). Mean values for open and dense microsites correlated weil with the relative frequencies of mature plants, which may reflect the limited dispersal potential ofthe seeds (King 1976, Greig-Smith 1979.…”

Section: A Vailabi/ity Of Seedsmentioning

confidence: 99%

Demography of Short-Lived Forbs in Chalk Grassland in Relation to Vegetation Structure

During¹,

Schenkeveld²,

Verkaar³

et al. 1985

The Population Structure of Vegetation

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The effects of vegetation structure on population processes in five shortlived species occurring in two Dutch chalk grasslands are analyzed on the basis of some Iabaratory and field experiments. The main factors regulating population numbers appear tobe light quantity available for seedlings in dense microsites and water availability, which affects seedling survival, growth and fecundity of established plants in open micro-habitats.Two broad categories are recognized, "spenders" and "savers". These are based on seed weight, mortality of seedlings, presence of a persistent seed bank and variation in life span. We suggest that coexistence of the short-lived species is due to niche-sharing rather than niche-differentiation.

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The Ecology of Short-Lived Forbs in Chalk Grasslands: Distribution of Germinative Seeds and its Significance for Seedling Emergence

Cited by 69 publications

References 33 publications

Spatial and temporal variability of seed bank resulting from overgrowing of xerothermic grassland

Spatial and temporal variability of seed bank resulting from overgrowing of xerothermic grassland

Spatial patterns in seed bank and vegetation of semi-natural mountain meadows

Demography of Short-Lived Forbs in Chalk Grassland in Relation to Vegetation Structure

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