Ecological strategies of lichens

Rogers, R. W.

doi:10.1017/s002428299000010x

Cited by 97 publications

(86 citation statements)

References 28 publications

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“…However, I concluded that the distribution of L. pulmonaria within this stand on the Swiss Plateau was clearly limited by its low reproductive potential, which may fail to compete with a relatively high disturbance, natural or anthropogenic, of the stand. Although on the study site the main disturbance was a local wind throw in 1928, changes in forest management (Rose 1992), including shorter cutting cycles (Denison et al 1977), are probably the main factors that may lead to a rapid disappearance of L. pulmonaria and other, especially competitive (Grime 1977;Rogers 1990), lichens.…”

Section: Discussionmentioning

confidence: 95%

“…Lichenized ascomycetes have evolved an impressive range of symbiotic and aposymbiotic propagules (Poelt 1993(Poelt , 1994Biidel & Scheidegger 1995) that are adapted to different ecological (Rogers 1990;During 1992) and reproductive (Bowler & Rundel 1975) strategies. After dispersal to a new habitat (Bailey 1976), fixation, germination and subsequent juvenile development (van der Pijl 1982) are essential steps for successful reproduction.…”

Section: Introductionmentioning

confidence: 99%

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Early Development of Transplanted Isidioid Soredia of Lobaria Pulmonaria in an Endangered Population

Scheidegger

1995

LIC

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Vegetative diaspores of Lobaria pulmonaria were transplanted to previously uncolonized trees. The early development of the corticated but otherwise non-stratified isidioid soredia was studied mainly by low-temperature scanning electron microscopy. Anchoring hyphae developed from cortical hyphae after 2-4 months and later apical or lateral pseudomeristematic growth zones were formed. After 15 months the growth zones further differentiated into 0-5-mm-broad lobes and revealed a stratified thallus typical for this foliose epiphytic lichen species. The experiment showed that the small population size of L. pulmonaria was limited by the low reproductive potential of the species and that it might fail to compensate for a relatively high disturbance, natural or anthropogenic, in the stand.U 1995 The British Lichen Society

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Early Development of Transplanted Isidioid Soredia of Lobaria Pulmonaria in an Endangered Population

Scheidegger

1995

LIC

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“…Bohn et al, 2011): the absolute increase in cover per area of ground is both limited by the already existing cover, which generates the new biomass, as well as the free area that is still available for the growth of new cover. The transition of new cover from the existing cover to the free area may take place in the form of spores or via vegetative growth (Grime et al, 1990;Rogers, 1990). The efficiency of these processes is summarised in the dynamic scheme by an "expansion efficiency" (see Fig.…”

Section: Model Descriptionmentioning

confidence: 99%

Effects of bryophyte and lichen cover on permafrost soil temperature at large scale

2016

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Abstract. Bryophyte and lichen cover on the forest floor at high latitudes exerts an insulating effect on the ground. In this way, the cover decreases mean annual soil temperature and can protect permafrost soil. Climate change, however, may change bryophyte and lichen cover, with effects on the permafrost state and related carbon balance. It is, therefore, crucial to predict how the bryophyte and lichen cover will react to environmental change at the global scale. To date, current global land surface models contain only empirical representations of the bryophyte and lichen cover, which makes it impractical to predict the future state and function of bryophytes and lichens. For this reason, we integrate a process-based model of bryophyte and lichen growth into the global land surface model JSBACH (Jena Scheme for Biosphere-Atmosphere Coupling in Hamburg). The model simulates bryophyte and lichen cover on upland sites. Wetlands are not included. We take into account the dynamic nature of the thermal properties of the bryophyte and lichen cover and their relation to environmental factors. Subsequently, we compare simulations with and without bryophyte and lichen cover to quantify the insulating effect of the organisms on the soil.We find an average cooling effect of the bryophyte and lichen cover of 2.7 K on temperature in the topsoil for the region north of 50 • N under the current climate. Locally, a cooling of up to 5.7 K may be reached. Moreover, we show that using a simple, empirical representation of the bryophyte and lichen cover without dynamic properties only results in an average cooling of around 0.5 K. This suggests that (a) bryophytes and lichens have a significant impact on soil temperature in high-latitude ecosystems and (b) a processbased description of their thermal properties is necessary for a realistic representation of the cooling effect. The advanced land surface scheme, including a dynamic bryophyte and lichen model, will be the basis for an improved future projection of land-atmosphere heat and carbon exchange.

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“…Jørgensen (1993) suggests that the hepatic-like morphology of this lichen and the presence of UV + substances (lichexanthone derivatives) could be related to the UV-vision of insects and represent a case of mimicry or a licheninsect interaction. However, we rather interpret these characters as a case of morphological convergence where the hyphae would determine the special shape from a specific ecophysiological adaptation to the microenvironment as has occurred in other lichenized fungi (Rogers 1990). In lichens, it is very difficult to find a case of mimicry as the one supposed by Jørgensen and most reports in the literature about mimicry in lichens are hypotheses without solid evidence (Marcano et al 1995c).…”

Section: Discussionmentioning

confidence: 96%

Pseudohepatica duidensis, a new lichen from the venezuelan Amazonas

Marcano

Palacios-Prü

Morales

2000

BDE

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Abstract:The species Pseudohepatica duidensis Marcano, Palacios & Morales is described from the Venezuelan Amazonas. Special attention has been paid to the morphology and the chemistry (e.g. polysaccharides and secondary compounds), using scanning electron microscopy (SEM), thin-layer chromatography (TLC, HPTLC) and iodine reagent tests. Pseudohepatica duidensis is characterized by a very small (to 1 mm long), yellowish-green thallus, non-pored epicortex, yellowish lower surface with soredial protuberances, paraplectenchymatous upper cortex consisting of strongly sclerotic cells, cell walls with iodine reactions characteristic of lichenan and gyrophoric acid as relevant chemical constituent.

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Ecological strategies of lichens

Cited by 97 publications

References 28 publications

Early Development of Transplanted Isidioid Soredia of Lobaria Pulmonaria in an Endangered Population

Early Development of Transplanted Isidioid Soredia of Lobaria Pulmonaria in an Endangered Population

Effects of bryophyte and lichen cover on permafrost soil temperature at large scale

<p><strong><em>Pseudohepatica duidensis, </em>a new lichen from the venezuelan Amazonas</strong></p>

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