Changes in functional traits of the terricolous lichen <i>Peltigera aphthosa</i> across a retrogressive boreal forest chronosequence

Asplund, Johan; Wardle, David A.

doi:10.1017/s0024282915000092

Cited by 7 publications

(5 citation statements)

References 55 publications

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“…At the same time, however, N caused significant effects on the partners’ physiology and biochemistry. Thallus N content was increased from 25 to 35 mg/g DW by the 100‐fold increase in N‐exposure (Figure ) which is still within the range of thallus N values in untreated P. aphthosa thalli (Asplund & Wardle, ; Dahlman & Palmqvist, ; Palmqvist et al., ; Sundberg et al., ). This is in contrast to other lichens during similar conditions where thallus N may be threefold to fivefold higher in N fertilized compared to nonfertilized treatments (Johansson et al., ; Palmqvist & Dahlman, ).…”

Section: Discussionsupporting

confidence: 52%

“…P. aphthosa has a high capacity for growth compared to many other lichens (Alam et al., ; Dahlman & Palmqvist, ; Palmqvist & Sundberg, ), and there is detailed information on the photosynthetic characteristics of its Coccomyxa symbiont (Hiltonen, Karlsson, Palmqvist, Clarke, & Samuelsson, ; Palmqvist, ; Palmqvist, Sültemeyer, Baldet, Andrews, & Badger, ). It has a wide geographical distribution (Martinez, Burgazo, Vitikainen, & Escudero, ) and seems able to maintain a balanced CNP stoichiometry (Elser, Dobberfuhl, MacKay, & Schampel, ) under varying nutrient supplies (Asplund & Wardle, ). P. aphthosa can further handle mild N stress when P is available (Dahlman et al., ; Sundberg et al., ).…”

Section: Introductionmentioning

confidence: 99%

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Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens

Palmqvist

Franklin

Näsholm

2017

Ecology and Evolution

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Symbioses such as lichens are potentially threatened by drastic environmental changes. We used the lichen Peltigera aphthosa—a symbiosis between a fungus (mycobiont), a green alga (Coccomyxa sp.), and N2‐fixing cyanobacteria (Nostoc sp.)—as a model organism to assess the effects of environmental perturbations in nitrogen (N) or phosphorus (P). Growth, carbon (C) and N stable isotopes, CNP concentrations, and specific markers were analyzed in whole thalli and the partners after 4 months of daily nutrient additions in the field. Thallus N was 40% higher in N‐fertilized thalli, amino acid concentrations were twice as high, while fungal chitin but not ergosterol was lower. Nitrogen also resulted in a thicker algal layer and density, and a higher δ13C abundance in all three partners. Photosynthesis was not affected by either N or P. Thallus growth increased with light dose independent of fertilization regime. We conclude that faster algal growth compared to fungal lead to increased competition for light and CO 2 among the Coccomyxa cells, and for C between alga and fungus, resulting in neither photosynthesis nor thallus growth responded to N fertilization. This suggests that the symbiotic lifestyle of lichens may prevent them from utilizing nutrient abundance to increase C assimilation and growth.

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Section: Discussionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens

Palmqvist

Franklin

Näsholm

2017

Ecology and Evolution

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“…Peltigera aphthosa ( Peltigeraceae ) is one of the most studied lichens with cephalodia, containing a green microalga from the genus Coccomyxa and a nitrogen-fixing cyanobacterium from the genus Nostoc (Büdel & Scheidegger 2008). In this lichen, an increase in the abundance of cephalodia is indicative of higher rates of nitrogen fixation, as a consequence of a lower availability of nitrogen in the environment and serves as a potential marker of nitrogen and phosphorous content in the soil (Asplund & Wardle 2015). Further analyses employing more specific molecular and microscopy techniques will be necessary to demonstrate whether cyanobacteria are stable partners of the Lichenomphalia holobiont, or have a commensalist relationship, or whether their coexistence is just due to common ecological preferences.…”

Section: Discussionmentioning

confidence: 99%

Symbiont composition of the basidiolichen Lichenomphalia meridionalis varies with altitude in the Iberian Peninsula

et al. 2020

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Basidiolichens are generally poorly researched because of the very small number of species and their restriction to special niches. Lichenomphalia basidiolichens grow in considerable quantities in arctic and alpine habitats but they are inadequately studied in these habitats in Mediterranean areas. Based on morphological and phylogenetic analyses, we identified the different symbionts of L. meridionalis, collected in localities in Spain at altitudes ranging from 533 to 2200 m above sea level. The present study provides the first molecular data available for L. meridionalis. We found that a microindel of six bp within the nrITS2 could help to discriminate L. meridionalis from other species of the genus. Molecular analyses revealed the existence of two different green algal strains, both belonging to Coccomyxa subellipsoidea, a species shared with other Lichenomphalia lichens. Notably, the two chlorobiont strains associated with L. meridionalis were differentially distributed according to altitude, and samples having one of the two strains consistently also included cyanobacteria.

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“…Thamnolia species often occur in arctic tundra communities (Sheard, 1977) and are of low specificity concerning their photobiont as they associate with various Trebouxia species (Nelsen and Gargas, 2009). Peltigera preferentially grows in temperate regions on soils and among mosses over rocks, but can also be found on tree trunks (Nash 2002) and in boreal forests (Asplund and Wardle, 2015), explaining their abundance in the more forested Holocene in our records from CH12 (Figure 2).…”

Section: Lichensmentioning

confidence: 86%

Long-term fungus-plant co-variation from multi-site sedimentary ancient DNA metabarcoding in Siberia

Hippel

Stoof‐Leichsenring

Schulte

et al. 2021

Preprint

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Climate change has a major impact on arctic and boreal terrestrial ecosystems as warming leads to northward treeline shifts, inducing consequences for heterotrophic organisms associated with the plant taxa. To unravel ecological dependencies, we address how long-term climatic changes have shaped the palaeo-ecosystems at selected sites in Siberia. We investigated sedimentary ancient DNA from five lakes spanning the last 47,000 years, using the ITS1 marker for fungi and the chloroplast P6 loop marker for vegetation metabarcoding. After bioinformatic processing with the OBItools pipeline, we obtained 706 unique fungal operational taxonomic units (OTUs) and 243 amplicon sequence variants (ASVs) for the plants. We show higher OTU numbers in dry forest tundra as well as boreal forests compared to wet southern tundra. The most abundant fungal taxa in our dataset are Pseudeurotiaceae, Mortierella, Sordariomyceta, Exophiala, Oidiodendron, Protoventuria, Candida vartiovaarae, Pseudeurotium, Gryganskiella fimbricystis, and Trichosporiella cerebriformis. The overall fungal composition is explained by the plant composition as revealed by redundancy analysis. The fungal functional groups show antagonistic relationships in their climate susceptibility. The advance of woody taxa in response to past warming led to an increase in the abundance of mycorrhizae, lichens, and parasites, while yeast and saprotroph distribution declined. We also show co-occurrences between Salicaceae, Larix, and Alnus and their associated pathogens and detect higher mycorrhizal fungus diversity with the presence of Pinaceae. Under future warming, we can expect feedback between fungus compositional and plant diversity changes which will affect forest advance and stability in arctic regions.

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Changes in functional traits of the terricolous lichen Peltigera aphthosa across a retrogressive boreal forest chronosequence

Cited by 7 publications

References 55 publications

Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens

Symbiosis constraints: Strong mycobiont control limits nutrient response in lichens

Symbiont composition of the basidiolichen Lichenomphalia meridionalis varies with altitude in the Iberian Peninsula

Long-term fungus-plant co-variation from multi-site sedimentary ancient DNA metabarcoding in Siberia

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