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C. J. Miles

Bio: C. J. Miles is an academic researcher from University of Reading. The author has contributed to research in topics: Germination & Spore. The author has an hindex of 1, co-authored 1 publications receiving 81 citations.

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TL;DR: The facility for vegetative reproduction and reproduction by spores was compared in four common mosses by observations on naturally occurring spores, sporclings and juvenile shoots combined with experimental field plantings, showing contrasting life-history strategies shown by the four species.

84 citations


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TL;DR: Effects of single environmental variables on species richness depend both on the taxonomic group and on the combination of environmental factors on a whole, and suggests that competition between vascular plants and cryptogams is rather asymmetric.
Abstract: We studied the relative importance of local habitat conditions and landscape structure for species richness of vascular plants, bryophytes and lichens in dry grasslands on the Baltic island of Oland (Sweden). In addition, we tested whether relationships between species richness and vegetation cover indicate that competition within and between the studied taxonomic groups is important. We recorded species numbers of vascular plants, bryophytes and lichens in 4 m2 plots (n=452), distributed over dry grassland patches differing in size and degree of isolation. Structural and environmental data were collected for each plot. We tested effects of local environmental conditions, landscape structure and vegetation cover on species richness using generalized linear mixed models. Different environmental variables explained species richness of vascular plants, bryophytes and lichens. Environmental effects, particularly soil pH, were more important than landscape structure. Interaction effects of soil pH with other environmental variables were significant in vascular plants. Plot heterogeneity enhanced species richness. Size and degree of isolation of dry grassland patches significantly affected bryophyte and lichen species richness, but not that of vascular plants. We observed negative relationships between bryophyte and lichen species richness and the cover of vascular plants. To conclude, effects of single environmental variables on species richness depend both on the taxonomic group and on the combination of environmental factors on a whole. Dispersal limitation in bryophytes and lichens confined to dry grasslands may be more common than is often assumed. Our study further suggests that competition between vascular plants and cryptogams is rather asymmetric.

166 citations

Journal ArticleDOI
TL;DR: The incidence of rarity is thus lowest among dioecious fruiting species, and highest among species that are monoecious and produce sporophytes or are diecious and do not.

116 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined bryophyte guilds and community composition in relation to habitat quality (microclimate and substrate) in five treatment classes in New Brunswick Acadian forest, 4 years after harvest.

116 citations

Journal ArticleDOI
TL;DR: Spore deposition over the experimental periods showed a steep gradient, deposition per unit area falling from 4740—14, 230 sporescm−2 in the centre of the colonies to less than 10 spores cm−2 200 cm from the edge of the colony.
Abstract: Daily counts were made of spores trapped on microscope slides coated with petroleum jelly and placed on the ground at distances up to 200 em from isolated colonies of Atrichum undulatum and Bryum argenteum. The observations continued for 30–34 days during the annual period of spore release in these species. Estimates of the number of spores released by the colonies were obtained as the product of the numbers of capsules and the difference between the mean numbers of spores present in undehisced capsules at the beginning of the experiment and remaining in dehisced capsules at the end.Spore deposition over the experimental periods showed a steep gradient, deposition per unit area falling from 4740—14, 230 spores cm−2 in the centre of the colonies to less than 10 spores cm−2 200 cm from the edge of the colonies. Despite the steep deposition gradients, however, it was estimated that more than 85% of the spores in A. undulatum, and more than 95% of those in B. argenteum, were dispersed to unknown dista...

112 citations