Secondary metabolites in <i>Cladina stellaris</i> in relation to reindeer grazing and thallus nutrient content

Hyvärinen, Marko; Walter, Bettina; Koopmann, Ricarda

doi:10.1034/j.1600-0706.2002.960209.x

Cited by 22 publications

(21 citation statements)

References 44 publications

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“…However, natural colonization could be enhanced by using substrates that not only enable lichen fragments to fasten, but also help isolated thalli to avoid drying, and consequent reductions in their metabolic activity (cf. Helle et al 1983, Hyvärinen et al 2002. Moss seems to be a suitable substrate, since it generates relatively high humidity and thus should help to conserve thallus fragments.…”

Section: Possibilities For Reindeer Lichenmentioning

confidence: 99%

Influence of ground substrate on establishment of reindeer lichen after artificial dispersal

Roturier¹,

Bäcklund²,

Sundén³

et al. 2007

Silva Fenn.

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Methods to improve the recovery of reindeer lichen after soil disturbance or overgrazing are being sought for areas where reindeer are herded. The effects of four substrates -mineral soil, moss, twigs and pine bark -on the establishment of lichen fragments after total removal of the vegetation were thus studied in a middle-aged pine stand and a clear-cut, both located in a lichen-rich pine-heath. Cladina mitis fragments of two sizes were manually dispersed in 1 m 2 quadrats and their movements from their respective dispersal points were registered after one year. The natural re-establishment of lichens in the quadrats was monitored over three years by using digital pictures. In the forest stand, no significant differences were detected in either the fragment movement or the lichen establishment between the different substrates, but the fragment size had positive effects on both parameters. In the clear-cut, the moss substrate was the most suitable not only for the artificially dispersed lichens to fasten to, but also for the natural settlement of lichens from the surrounding lichen mat. More lichen thalli fastened to the bark and twigs substrates than to the mineral soil, but the settlement of lichens from the surrounding was greater on bare mineral soil substrate. The results indicate that artificial dispersal of lichen thalli on an appropriate substrate could be a successful strategy for promoting lichen recovery.

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Section: Possibilities For Reindeer Lichenmentioning

confidence: 99%

Influence of ground substrate on establishment of reindeer lichen after artificial dispersal

Roturier¹,

Bäcklund²,

Sundén³

et al. 2007

Silva Fenn.

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“…1% to 5% and maxima of ca. 8-15% per unit dry mass (Huovinen and Ahti 1986;Hyvärinen et al 2002). Moreover, those lichen species that harbour a cyanobacterial photobiont capable of fixing atmospheric N and hence satisfying the N demand of lichen growth, usually grow faster than other lichens Rogers (1990) and lack polyphenolic secondary metabolites (Galun and ShomerIlan 1988).…”

Section: Introductionmentioning

confidence: 98%

Impact of fertilisation on phenol content and growth rate of Cladina stellaris: a test of the carbon-nutrient balance hypothesis

2003

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Responses of concentrations of usnic (UA) and perlatolic (PA) acids and the relative growth rate (RGR) of a mat-forming lichen, Cladina stellaris, to enhanced N and P input were studied in a fertilisation experiment. It was predicted on the basis of carbon-nutrient balance (CNB) hypothesis that the concentrations of these phenolics would decline and the growth rate increase in response to increased nutrient uptake. The concentration of UA showed a convex response pattern to increased N input whereas the concentration of PA was non-responsive. An ecologically realistic, "moderate", N treatment clearly lowered the level of UA both with and without the P application. Applying P alone caused a significant increase in the level of UA. The RGR of C. stellaris did not respond to nutrient addition. The results indicate that even though the CNB hypothesis may be applicable in explaining concentrations of lichen secondary metabolites, it may be applied under a relatively narrow set of conditions. Especially inherited constraints in the growth of lichen fungi may seriously limit the responsiveness of lichens to short-time changes in the availability of resources. These limitations may also apply to other perennials adapted to nutrient-poor conditions.

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“…2003. Plants adapted to infertile environments produce more phenolics than those adapted to fertile environments (Bryant et al 1983, Coley et al 1985, Huovinen and Ahti 1986, Hyvarinen et al 2002. The carbon:nutrient balance hypothesis (CNB) predicts that production of phenolics by a plant is proportional to the internal carbon surplus between growth demand and net photosynthate supply of the plant (Bryant et al 1983).…”

Section: Introductionmentioning

confidence: 99%

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

Cao

Xie

et al. 2008

Journal of Freshwater Ecology

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In order to examine how carbon and nitrogen status of a macrophyte may affect its total phenolics (TP) production, the contents of free amino acids (FAA), soluble carbohydrate (SC) and TP were examined in leaves of seven submersed, four floating-leaved, and four emergent macrophytes. The floating-leaved and emergent macrophytes had much higher contents of SC and TP than the submersed macrophytes. The contents of FAA were not significantly different among the submersed, floating-leaved, and emergent macrophytes. Correlations among the contents of FAA, SC, and TP indicated that the production of TP was more dependent on the SC content than on the FAA content.

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Secondary metabolites in Cladina stellaris in relation to reindeer grazing and thallus nutrient content

Cited by 22 publications

References 44 publications

Influence of ground substrate on establishment of reindeer lichen after artificial dispersal

Influence of ground substrate on establishment of reindeer lichen after artificial dispersal

Impact of fertilisation on phenol content and growth rate of Cladina stellaris: a test of the carbon-nutrient balance hypothesis

Relationships among the Contents of Total Phenolics, Soluble Carbohydrate, and Free Amino Acids of 15 Aquatic Macrophytes

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