An explanation of the intermittent occurrence of<i>Physcomitrium sphaericum</i>(Hedw.) Brid.

Furness, S. B.; Hall, R. H.

doi:10.1179/jbr.1981.11.4.733

Cited by 35 publications

(25 citation statements)

References 9 publications

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“…The question is : is there a trade-off between longevity in spores under dry storage and under wet conditions ? Or do they correlate, as has been shown for vascular plant seeds (Furness & Hall, 1981) ?…”

Section: mentioning

confidence: 99%

“…Although disturbance experiments and other studies have shown the capacity among many bryophyte species to establish from a persistent diaspore bank (Furness & Hall, 1981 ;Clymo & Duckett, 1986 ;Jonsson, 1993 ;During, 1997), the only way to quantify spore longevity in nature and its potential long-term effect is to follow the survival of spore cohorts placed in the soil.…”

Section: mentioning

confidence: 99%

“…Ungerminated spores from a large number of bryophyte taxa have been shown to survive for several years when stored dry at room temperature, for example in herbaria (Malta, 1922 ;Bernstein, 1928 ;Chalaud, 1932 ;Paschke, 1965 ;van Zanten, 1978 ;Furness & Hall, 1981 ;van Zanten & Gradstein, 1988 ;Dalen & So$ derstro$ m, 1999). The greatest longevity, 55 yr, has been recorded for Physcomitrium pyriforme (Paschke, 1965).…”

Section: mentioning

confidence: 99%

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Experimental evidence for a persistent spore bank in Sphagnum

Sundberg

Rydin

2000

New Phytologist

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Spore capsules of four Sphagnum species were buried at different depths in peat on a bog. Spore viability was determined after 0, 1, 2 and 3 yr. Viability generally declined with time, but viable spores were still found at all depths after 3 yr. The light-coloured spores of S. balticum and S. tenellum retained their viability better than the darker spores of S. fuscum and S. lindbergii. Survival was highest under wet but aerobic conditions, but was also high under humid or periodically desiccated conditions. By contrast, most spores stored under wet, anaerobic conditions died within 2-3 yr. These results, and predictions from them, are not consistent with earlier results for spores of long-lived and dominant bryophytes, or for seeds of phanerogams of undisturbed wetlands and forests. There was no correlation between spore size and longevity across species, but the small spores from small capsules of S. balticum and S. tenellum generally showed higher viability than those from the medium-sized and large capsules of the same species. This suggests a positive intraspecific relationship between longevity and dispersal distance. There was an indication of conditional dormancy, controlled by weather, in Sphagnum spores. The experiments indicate that Sphagnum spores can form a long-term persistent spore bank under suitable conditions, with a half-life of between 1 and 20 yr (mean across species of 2n6 and 5n0 yr at two depths studied), and with potential values in individual spore capsules of several decades, or even of centuries. Sphagnum spores kept refrigerated showed 15-35% viable spores after 13 yr. The capacity to form a persistent spore bank that can be activated whenever favourable conditions occur might help explain the wide geographical distribution of many Sphagnum species in the boreal and temperate zones, where they have managed to colonize almost every suitable patch of acidic, nutrient-poor wetland.

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Section: mentioning

confidence: 99%

Section: mentioning

confidence: 99%

Section: mentioning

confidence: 99%

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Experimental evidence for a persistent spore bank in Sphagnum

Sundberg

Rydin

2000

New Phytologist

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“…This allows plants to avoid competition (Hyatt and Evans 1998) by disseminating diaspores that remain in a dormant and viable condition for undetermined periods as part of a well-adapted ''resting'' strategy (Furness and Hall 1981). Diaspore banks also accumulate genetic variation for species with long-lived diaspores that colonize temporary microsites; this may help maintain the genetic diversity of above-ground populations (Hock et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Recolonization potential of bryophyte diaspore banks in harvested boreal mixed-wood forest

2008

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Bryophyte diaspore banks are a potential source of reproductive propagules that may be able to colonize newly available habitat after forest harvesting. However, their role and the factors influencing the successful establishment of species remain poorly understood. To investigate these aspects of diaspore banks, we obtained mineral soil samples from mixed and coniferous stands of boreal mixed-wood forest in northern Alberta, Canada, which had recently experienced a range of harvesting intensities. Samples were germinated in growth cabinets under two light regimes. The composition of germinated bryophyte species was compared among forest types, harvesting intensities, and light levels, and also related to edaphic conditions and geographic location of the sample site. Germinated species composition was not related to forest type or harvesting intensity, but was associated with measured edaphic variables and geographic space, indicating that similarity in species composition reflected similarity in edaphic conditions and spatial proximity. This was partly because of spatial dependence of edaphic variables. Light intensity had a significant influence on the development of species assemblages and individual species responses. Richness and cover of acrocarpous mosses (fugitive, colonist, and shuttle life-history strategies) were significantly reduced under low light conditions, but pleurocarpous mosses (perennial strategy) were not affected. Shannon diversity and the frequency of reproduction were significantly greater with high light. Pleurocarpous mosses that are characteristic of intact forests germinated frequently, suggesting that diaspore banks may influence their recovery after disturbance. Diaspore banks are a repository of species at sites affected by forest harvesting; however, diaspore germination and establishment will be constrained by the local environment, including edaphic conditions and light intensity.

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“…However, whereas most "shuttle" bryophytes depend on gaps (cf. Furness and Hall 1982) and thus may be compared to turf-incompatible monocarpic phanerogams, the turf-compatible spenders and savers are more dependent on spatial and temporal variation in the general vegetation structure and perhaps in the ecosystem as a whole including predators.…”

Section: Saversmentioning

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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An explanation of the intermittent occurrence ofPhyscomitrium sphaericum(Hedw.) Brid.

Cited by 35 publications

References 9 publications

Experimental evidence for a persistent spore bank in Sphagnum

Experimental evidence for a persistent spore bank in Sphagnum

Recolonization potential of bryophyte diaspore banks in harvested boreal mixed-wood forest

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

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